dmlib: src/dmzlib.c annotate

annotate src/dmzlib.c @ 954:88cbea0ee9b5

Cleanup.

author	Matti Hamalainen <ccr@tnsp.org>
date	Thu, 26 Feb 2015 19:06:32 +0200
parents	1723ebe6771c
children	6b2f41844580

rev	line source
949 6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	1 /*
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	2 * DMLib
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	3 * -- ZLib implementation
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	4 * Public domain zlib decode v0.2 by Sean Barrett 2006-11-18
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	5 * Modified and reformatted for DMLib by Matti 'ccr' Hamalainen
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	6 */
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	7 #include "dmzlib.h"
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	8
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	9
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	10 #define DM_ZLIB_TMPBUF_SIZE (16 * 1024)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	11 #define STBI_ASSERT(x) // dummy
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	12
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	13
951 1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	14 static int stbi__err(const char s, const char p)
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	15 {
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	16 (void) s;
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	17 (void) p;
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	18 return 0;
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	19 }
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	20
1723ebe6771c Add kludge stbi__err() implementation temporarily until the error handling Matti Hamalainen <ccr@tnsp.org> parents: 949 diff changeset	21
949 6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	22 // @TODO: should statically initialize these for optimal thread safety
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	23 static Uint8 stbi__zdefault_length[288], stbi__zdefault_distance[32];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	24
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	25
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	26 void dmZLibInit()
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	27 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	28 int i;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	29
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	30 // use <= to match clearly with spec
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	31 for (i = 0; i <= 143; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	32 stbi__zdefault_length[i] = 8;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	33
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	34 for (; i <= 255; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	35 stbi__zdefault_length[i] = 9;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	36
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	37 for (; i <= 279; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	38 stbi__zdefault_length[i] = 7;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	39
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	40 for (; i <= 287; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	41 stbi__zdefault_length[i] = 8;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	42
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	43 for (i = 0; i <= 31; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	44 stbi__zdefault_distance[i] = 5;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	45 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	46
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	47
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	48 static inline int stbi__bit_reverse_16(int n)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	49 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	50 n = ((n & 0xAAAA) >> 1) \| ((n & 0x5555) << 1);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	51 n = ((n & 0xCCCC) >> 2) \| ((n & 0x3333) << 2);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	52 n = ((n & 0xF0F0) >> 4) \| ((n & 0x0F0F) << 4);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	53 n = ((n & 0xFF00) >> 8) \| ((n & 0x00FF) << 8);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	54 return n;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	55 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	56
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	57
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	58 static inline int stbi__bit_reverse_n(int v, int bits)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	59 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	60 STBI_ASSERT(bits <= 16);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	61 // to bit reverse n bits, reverse 16 and shift
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	62 // e.g. 11 bits, bit reverse and shift away 5
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	63 return stbi__bit_reverse_16(v) >> (16 - bits);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	64 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	65
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	66
954 88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	67 static int stbi__zbuild_huffman(DMZHuffmanContext * z, const Uint8 * sizelist, const int num)
949 6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	68 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	69 int i, k = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	70 int code, next_code[16], sizes[17];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	71
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	72 // DEFLATE spec for generating codes
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	73 memset(sizes, 0, sizeof(sizes));
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	74 memset(z->fast, 0, sizeof(z->fast));
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	75
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	76 for (i = 0; i < num; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	77 sizes[sizelist[i]]++;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	78
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	79 sizes[0] = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	80 for (i = 1; i < 16; i++)
954 88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	81 {
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	82 if (sizes[i] > (1 << i))
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	83 return stbi__err("fail!", "omg!");
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	84 }
949 6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	85
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	86 code = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	87 for (i = 1; i < 16; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	88 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	89 next_code[i] = code;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	90 z->firstCode[i] = (Uint16) code;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	91 z->firstSymbol[i] = (Uint16) k;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	92 code = (code + sizes[i]);
954 88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	93
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	94 if (sizes[i] && code - 1 >= (1 << i))
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	95 return stbi__err("bad codelengths", "Corrupt JPEG");
88cbea0ee9b5 Cleanup. Matti Hamalainen <ccr@tnsp.org> parents: 951 diff changeset	96
949 6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	97 z->maxCode[i] = code << (16 - i); // preshift for inner loop
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	98 code <<= 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	99 k += sizes[i];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	100 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	101
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	102 z->maxCode[16] = 0x10000; // sentinel
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	103 for (i = 0; i < num; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	104 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	105 int s = sizelist[i];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	106 if (s)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	107 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	108 int c = next_code[s] - z->firstCode[s] + z->firstSymbol[s];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	109 Uint16 fastv = (Uint16) ((s << 9) \| i);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	110 z->size[c] = (Uint8) s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	111 z->value[c] = (Uint16) i;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	112 if (s <= STBI__ZFAST_BITS)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	113 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	114 int k = stbi__bit_reverse_n(next_code[s], s);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	115 while (k < STBI__ZFAST_SIZE)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	116 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	117 z->fast[k] = fastv;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	118 k += (1 << s);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	119 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	120 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	121 ++next_code[s];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	122 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	123 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	124 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	125 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	126
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	127
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	128 static inline Uint8 stbi__zget8(DMZLibContext * z)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	129 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	130 if (z->zbuffer >= z->zbuffer_end)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	131 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	132
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	133 return *z->zbuffer++;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	134 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	135
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	136
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	137 static void stbi__fill_bits(DMZLibContext * z)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	138 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	139 do
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	140 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	141 STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	142 z->code_buffer \|= stbi__zget8(z) << z->num_bits;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	143 z->num_bits += 8;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	144 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	145 while (z->num_bits <= 24);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	146 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	147
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	148
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	149 static inline unsigned int stbi__zreceive(DMZLibContext * z, int n)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	150 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	151 unsigned int k;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	152 if (z->num_bits < n)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	153 stbi__fill_bits(z);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	154 k = z->code_buffer & ((1 << n) - 1);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	155 z->code_buffer >>= n;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	156 z->num_bits -= n;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	157 return k;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	158 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	159
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	160
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	161 static int stbi__zhuffman_decode_slowpath(DMZLibContext * a, DMZHuffmanContext * z)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	162 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	163 int b, s, k;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	164
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	165 // not resolved by fast table, so compute it the slow way
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	166 // use jpeg approach, which requires MSbits at top
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	167 k = stbi__bit_reverse_16(a->code_buffer);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	168 for (s = STBI__ZFAST_BITS + 1; ; s++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	169 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	170 if (k < z->maxCode[s]) break;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	171 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	172
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	173 if (s == 16)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	174 return -1; // invalid code!
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	175
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	176 // code size is s, so:
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	177 b = (k >> (16 - s)) - z->firstCode[s] + z->firstSymbol[s];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	178 STBI_ASSERT(z->size[b] == s);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	179 a->code_buffer >>= s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	180 a->num_bits -= s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	181 return z->value[b];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	182 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	183
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	184
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	185 static inline int stbi__zhuffman_decode(DMZLibContext * a, DMZHuffmanContext * z)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	186 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	187 int b;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	188 if (a->num_bits < 16)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	189 stbi__fill_bits(a);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	190
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	191 b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	192 if (b)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	193 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	194 int s = b >> 9;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	195 a->code_buffer >>= s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	196 a->num_bits -= s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	197 return b & 511;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	198 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	199 return stbi__zhuffman_decode_slowpath(a, z);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	200 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	201
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	202
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	203 static int stbi__zexpand(DMZLibContext * z, char *zout, int n) // need to make room for n bytes
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	204 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	205 char *q;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	206 int cur, limit;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	207 z->zout = zout;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	208
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	209 if (!z->z_expandable)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	210 return stbi__err("output buffer limit", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	211
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	212 cur = (int) (z->zout - z->zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	213 limit = (int) (z->zout_end - z->zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	214
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	215 while (cur + n > limit)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	216 limit *= 2;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	217
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	218 if ((q = (char *) dmRealloc(z->zout_start, limit)) == NULL)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	219 return stbi__err("outofmem", "Out of memory");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	220
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	221 z->zout_start = q;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	222 z->zout = q + cur;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	223 z->zout_end = q + limit;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	224 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	225 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	226
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	227
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	228 static const int stbi__zlength_base[31] =
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	229 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	230 3, 4, 5, 6, 7, 8, 9, 10, 11, 13,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	231 15, 17, 19, 23, 27, 31, 35, 43, 51, 59,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	232 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	233 };
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	234
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	235 static const int stbi__zlength_extra[31] =
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	236 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	237 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	238 5, 5, 5, 5, 0, 0, 0
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	239 };
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	240
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	241 static const int stbi__zdist_base[32] =
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	242 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	243 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	244 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	245 16385, 24577, 0, 0
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	246 };
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	247
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	248 static const int stbi__zdist_extra[32] =
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	249 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	250 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	251 10, 11, 11, 12, 12, 13, 13
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	252 };
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	253
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	254
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	255 static int stbi__parse_huffman_block(DMZLibContext * a)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	256 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	257 char *zout = a->zout;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	258 for (;;)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	259 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	260 int z = stbi__zhuffman_decode(a, &a->z_length);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	261 if (z < 256)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	262 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	263 if (z < 0)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	264 return stbi__err("bad huffman code", "Corrupt PNG"); // error in huffman codes
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	265
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	266 if (zout >= a->zout_end)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	267 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	268 if (!stbi__zexpand(a, zout, 1))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	269 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	270 zout = a->zout;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	271 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	272 *zout++ = (char) z;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	273 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	274 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	275 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	276 Uint8 *p;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	277 int len, dist;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	278 if (z == 256)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	279 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	280 a->zout = zout;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	281 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	282 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	283 z -= 257;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	284
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	285 len = stbi__zlength_base[z];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	286 if (stbi__zlength_extra[z])
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	287 len += stbi__zreceive(a, stbi__zlength_extra[z]);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	288
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	289 z = stbi__zhuffman_decode(a, &a->z_distance);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	290 if (z < 0)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	291 return stbi__err("bad huffman code", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	292
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	293 dist = stbi__zdist_base[z];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	294 if (stbi__zdist_extra[z])
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	295 dist += stbi__zreceive(a, stbi__zdist_extra[z]);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	296
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	297 if (zout - a->zout_start < dist)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	298 return stbi__err("bad dist", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	299
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	300 if (zout + len > a->zout_end)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	301 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	302 if (!stbi__zexpand(a, zout, len))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	303 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	304 zout = a->zout;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	305 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	306 p = (Uint8 *) (zout - dist);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	307 if (dist == 1)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	308 { // run of one byte; common in images.
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	309 Uint8 v = *p;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	310 do { *zout++ = v; } while (--len);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	311 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	312 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	313 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	314 do { zout++ = p++; } while (--len);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	315 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	316 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	317 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	318 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	319
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	320
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	321 static const Uint8 length_dezigzag[19] =
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	322 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	323 16, 17, 18, 0, 8, 7, 9,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	324 6 , 10, 5 , 11, 4, 12, 3,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	325 13, 2 , 14, 1 , 15
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	326 };
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	327
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	328
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	329 static int stbi__compute_huffman_codes(DMZLibContext * a)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	330 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	331 DMZHuffmanContext z_codelength;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	332 Uint8 lencodes[286 + 32 + 137]; //padding for maximum single op
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	333 Uint8 codelength_sizes[19];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	334 int i, n;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	335
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	336 int hlit = stbi__zreceive(a, 5) + 257;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	337 int hdist = stbi__zreceive(a, 5) + 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	338 int hclen = stbi__zreceive(a, 4) + 4;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	339
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	340 memset(codelength_sizes, 0, sizeof(codelength_sizes));
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	341
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	342 for (i = 0; i < hclen; i++)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	343 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	344 int s = stbi__zreceive(a, 3);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	345 codelength_sizes[length_dezigzag[i]] = (Uint8) s;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	346 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	347 if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	348 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	349
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	350 n = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	351 while (n < hlit + hdist)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	352 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	353 int c = stbi__zhuffman_decode(a, &z_codelength);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	354 STBI_ASSERT(c >= 0 && c < 19);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	355 if (c < 16)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	356 lencodes[n++] = (Uint8) c;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	357 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	358 if (c == 16)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	359 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	360 c = stbi__zreceive(a, 2) + 3;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	361 memset(lencodes + n, lencodes[n - 1], c);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	362 n += c;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	363 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	364 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	365 if (c == 17)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	366 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	367 c = stbi__zreceive(a, 3) + 3;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	368 memset(lencodes + n, 0, c);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	369 n += c;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	370 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	371 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	372 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	373 c = stbi__zreceive(a, 7) + 11;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	374 memset(lencodes + n, 0, c);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	375 n += c;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	376 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	377 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	378
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	379 if (n != hlit + hdist)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	380 return stbi__err("bad codelengths", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	381
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	382 if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	383 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	384
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	385 if (!stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	386 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	387 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	388 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	389
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	390
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	391 static int stbi__parse_uncompressed_block(DMZLibContext * a)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	392 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	393 Uint8 header[4];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	394 int len, nlen, k;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	395
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	396 if (a->num_bits & 7)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	397 stbi__zreceive(a, a->num_bits & 7); // discard
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	398
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	399 // drain the bit-packed data into header
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	400 k = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	401 while (a->num_bits > 0)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	402 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	403 header[k++] = (Uint8) (a->code_buffer & 255); // suppress MSVC run-time check
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	404 a->code_buffer >>= 8;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	405 a->num_bits -= 8;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	406 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	407 STBI_ASSERT(a->num_bits == 0);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	408
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	409 // now fill header the normal way
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	410 while (k < 4)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	411 header[k++] = stbi__zget8(a);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	412
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	413 len = header[1] * 256 + header[0];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	414 nlen = header[3] * 256 + header[2];
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	415
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	416 if (nlen != (len ^ 0xffff))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	417 return stbi__err("zlib corrupt", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	418
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	419 if (a->zbuffer + len > a->zbuffer_end)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	420 return stbi__err("read past buffer", "Corrupt PNG");
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	421
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	422 if (a->zout + len > a->zout_end && !stbi__zexpand(a, a->zout, len))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	423 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	424
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	425 memcpy(a->zout, a->zbuffer, len);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	426 a->zbuffer += len;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	427 a->zout += len;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	428 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	429 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	430
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	431
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	432 static int stbi__parse_zlib_header(DMZLibContext * a)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	433 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	434 int cmf = stbi__zget8(a);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	435 int cm = cmf & 15;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	436 int flg = stbi__zget8(a);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	437 // int cinfo = cmf >> 4;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	438
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	439 if ((cmf * 256 + flg) % 31 != 0)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	440 return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	441
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	442 if (flg & 32)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	443 return stbi__err("no preset dict", "Corrupt PNG"); // preset dictionary not allowed in png
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	444
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	445 if (cm != 8)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	446 return stbi__err("bad compression", "Corrupt PNG"); // DEFLATE required for png
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	447
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	448 // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	449 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	450 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	451
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	452
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	453 static int stbi__parse_zlib(DMZLibContext * a, BOOL parse_header)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	454 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	455 int final, type;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	456
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	457 if (parse_header && !stbi__parse_zlib_header(a))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	458 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	459
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	460 a->num_bits = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	461 a->code_buffer = 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	462 do
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	463 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	464 final = stbi__zreceive(a, 1);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	465 type = stbi__zreceive(a, 2);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	466 if (type == 0)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	467 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	468 if (!stbi__parse_uncompressed_block(a))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	469 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	470 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	471 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	472 if (type == 3)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	473 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	474 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	475 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	476 if (type == 1)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	477 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	478 // use fixed code lengths
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	479 if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length, 288))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	480 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	481
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	482 if (!stbi__zbuild_huffman
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	483 (&a->z_distance, stbi__zdefault_distance, 32))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	484 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	485 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	486 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	487 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	488 if (!stbi__compute_huffman_codes(a))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	489 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	490 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	491 if (!stbi__parse_huffman_block(a))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	492 return 0;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	493 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	494 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	495 while (!final);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	496 return 1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	497 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	498
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	499
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	500 static int stbi__do_zlib(DMZLibContext * a, char *obuf, int olen, int exp,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	501 BOOL parse_header)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	502 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	503 a->zout_start = obuf;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	504 a->zout = obuf;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	505 a->zout_end = obuf + olen;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	506 a->z_expandable = exp;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	507
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	508 return stbi__parse_zlib(a, parse_header);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	509 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	510
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	511
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	512 char stbi_zlib_decode_malloc_guesssize(const char buffer, int len, int initial_size, int *outlen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	513 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	514 DMZLibContext a;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	515 char p = (char ) dmMalloc(initial_size);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	516 if (p == NULL)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	517 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	518 a.zbuffer = (Uint8 *) buffer;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	519 a.zbuffer_end = (Uint8 *) buffer + len;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	520 if (stbi__do_zlib(&a, p, initial_size, 1, 1))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	521 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	522 if (outlen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	523 *outlen = (int) (a.zout - a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	524 return a.zout_start;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	525 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	526 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	527 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	528 dmFree(a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	529 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	530 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	531 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	532
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	533
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	534 char stbi_zlib_decode_malloc(char const buffer, int len, int *outlen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	535 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	536 return stbi_zlib_decode_malloc_guesssize(buffer, len, DM_ZLIB_TMPBUF_SIZE, outlen);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	537 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	538
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	539
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	540 char stbi_zlib_decode_malloc_guesssize_headerflag(const char buffer,
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	541 int len, int initial_size, int *outlen, BOOL parse_header)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	542 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	543 DMZLibContext a;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	544 char p = (char ) dmMalloc(initial_size);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	545 if (p == NULL)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	546 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	547
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	548 a.zbuffer = (Uint8 *) buffer;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	549 a.zbuffer_end = (Uint8 *) buffer + len;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	550 if (stbi__do_zlib(&a, p, initial_size, 1, parse_header))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	551 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	552 if (outlen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	553 *outlen = (int) (a.zout - a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	554 return a.zout_start;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	555 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	556 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	557 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	558 dmFree(a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	559 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	560 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	561 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	562
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	563
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	564 int stbi_zlib_decode_buffer(char obuffer, int olen, char const ibuffer, int ilen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	565 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	566 DMZLibContext a;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	567 a.zbuffer = (Uint8 *) ibuffer;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	568 a.zbuffer_end = (Uint8 *) ibuffer + ilen;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	569 if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	570 return (int) (a.zout - a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	571 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	572 return -1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	573 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	574
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	575
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	576 char stbi_zlib_decode_noheader_malloc(char const buffer, int len, int *outlen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	577 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	578 DMZLibContext a;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	579 char p = (char ) dmMalloc(DM_ZLIB_TMPBUF_SIZE);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	580 if (p == NULL)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	581 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	582
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	583 a.zbuffer = (Uint8 *) buffer;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	584 a.zbuffer_end = (Uint8 *) buffer + len;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	585
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	586 if (stbi__do_zlib(&a, p, DM_ZLIB_TMPBUF_SIZE, 1, 0))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	587 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	588 if (outlen != NULL)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	589 *outlen = (int) (a.zout - a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	590 return a.zout_start;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	591 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	592 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	593 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	594 dmFree(a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	595 return NULL;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	596 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	597 }
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	598
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	599
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	600 int stbi_zlib_decode_noheader_buffer(char obuffer, int olen, const char ibuffer, int ilen)
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	601 {
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	602 DMZLibContext a;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	603
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	604 a.zbuffer = (Uint8 *) ibuffer;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	605 a.zbuffer_end = (Uint8 *) ibuffer + ilen;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	606
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	607 if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	608 return (int) (a.zout - a.zout_start);
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	609 else
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	610 return -1;
6ed9465f3913 Initial import of separated zlib decoding routines lifted from Matti Hamalainen <ccr@tnsp.org> parents: diff changeset	611 }

Mercurial > hg > dmlib

annotate src/dmzlib.c @ 954:88cbea0ee9b5