/*  
   XMMS-SID - SIDPlay input plugin for X MultiMedia System (XMMS)

   Miscellaneous support functions
   
   Programmed and designed by Matti 'ccr' Hamalainen <ccr@tnsp.org>
   (C) Copyright 1999-2009 Tecnic Software productions (TNSP)

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

   --
   Except for the MD5 related functionality at the end of this file.
   --
*/
#include "xs_support.h"
#ifndef __AUDACIOUS_NEWVFS__
#include <sys/types.h>
#include <sys/stat.h>
#endif


gboolean xs_fread_str(XSFile *f, void *buf, const size_t len)
{
    return xs_fread(buf, len, 1, f) == 1;
}


gboolean xs_fread_byte(XSFile *f, guint8 *val)
{
    gint tmp = xs_fgetc(f);
    *val = tmp;
    return tmp != EOF;
}


/* Error messages
 */
void xs_error(const char *fmt, ...)
{
    va_list ap;
    fprintf(stderr, "XMMS-SID: ");
    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

#ifndef DEBUG_NP
void XSDEBUG(const char *fmt, ...)
{
#ifdef DEBUG
    va_list ap;
    fprintf(stderr, "XSDEBUG: ");
    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
#else
    (void) fmt;
#endif
}
#endif


#ifndef __AUDACIOUS_NEWVFS__
off_t xs_fsize(XSFile *f)
{
    off_t pos;
    if (fseeko(f, 0, SEEK_END) < 0)
        return -1;

    pos = ftello(f);

    if (fseeko(f, 0, SEEK_SET) < 0)
        return -1;

    return pos;
}
#endif


gboolean xs_is_dir_path(const gchar *path)
{
#ifndef __AUDACIOUS_NEWVFS__
    struct stat sb;
    if (stat(path, &sb) < 0)
        return FALSE;

    return (S_ISDIR(sb.st_mode));
#else
    // XXX
#endif
}


gchar *xs_get_dir_path(const gchar *path)
{
#ifndef __AUDACIOUS_NEWVFS__
    if (!xs_is_dir_path(path))
        return g_dirname(path);
    else
        return g_strdup(path);
#else
    // XXX
#endif
}


gboolean xs_fread_be16(XSFile *f, guint16 *val)
{
    guint16 result;
    if (xs_fread(&result, sizeof(result), 1, f) != 1)
        return FALSE;
    *val = GUINT16_FROM_BE(result);
    return TRUE;
}


gboolean xs_fread_be32(XSFile *f, guint32 *val)
{
    guint32 result;
    if (xs_fread(&result, sizeof(result), 1, f) != 1)
        return FALSE;
    *val = GUINT32_FROM_BE(result);
    return TRUE;
}


/* Load a file to a buffer, return 0 on success, negative value on error
 */
gboolean xs_fload_buffer(const gchar *filename,
    guint8 **pbuf, size_t *bufSize, const size_t maxSize, gboolean failMaxSize)
{
    XSFile *fp = NULL;
    size_t readSize = 0, fileSize = 0;
    gboolean res = FALSE;

    if (filename == NULL)
        return FALSE;

    if ((fp = xs_fopen(filename, "rb")) == NULL)
    {
        xs_error("Could not open '%s' for reading.\n", filename);
        goto error;
    }

    fileSize = xs_fsize(fp);
    if (failMaxSize && fileSize > maxSize)
    {
        xs_error("File '%s' size %d exceeds maxSize %d.\n",
            filename, fileSize, maxSize);
        goto error;
    }

    readSize = fileSize < maxSize ? fileSize : maxSize;

    if ((*pbuf = (guint8 *) g_malloc(readSize * sizeof(guint8))) == NULL)
    {
        xs_error("Could not allocate %d bytes for filebuffer '%s'.\n",
            readSize, filename);
        goto error;
    }

    *bufSize = xs_fread(*pbuf, sizeof(guint8), readSize, fp);
    res = (readSize == *bufSize);

error:
    if (fp != NULL)
        xs_fclose(fp);

    if (!res)
    {
        xs_error("File '%s', expected %d bytes, read %d bytes.\n",
            filename, readSize, *bufSize);
    }

    return res;
}


gboolean xs_fload_buffer_path(const gchar *ppath, const gchar *pfilename,
    guint8 **pbuf, size_t *bufSize, const size_t maxSize, gboolean failMaxSize)
{
    gchar *filename, *pseparator;
    gboolean res;

    if (pfilename == NULL)
        return FALSE;

    pseparator = ppath != NULL ? ((ppath[strlen(ppath)] != '/') ? "/" : "") : "";
    filename = g_strdup_printf("%s%s%s", ppath, pseparator, pfilename);

    if (filename == NULL)
        return FALSE;

    res = xs_fload_buffer(filename, pbuf, bufSize, maxSize, failMaxSize);

    g_free(filename);
    return res;
}


/*
 * MD5 implementation, modified for XMMS-SID from
 * Colin Plumb's implementation by Matti 'ccr' Hämäläinen.
 *
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest.  This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 */

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#  define xs_md5_bytereverse(buf, len)    /* Nothing */
#elif G_BYTE_ORDER == G_BIG_ENDIAN
static void xs_md5_bytereverse(guint8 *buf, guint l)
{
    guint32 t;
    do
    {
        t = (guint32) ((guint) buf[3] << 8 | buf[2]) << 16 | ((guint) buf[1] << 8 | buf[0]);
        *(guint32 *) buf = t;
        buf += sizeof(guint32);
    } while (--l);
}
#else
#  error Unsupported endianess!
#endif


/* Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
void xs_md5_init(xs_md5state_t *ctx)
{
    ctx->buf[0] = 0x67452301;
    ctx->buf[1] = 0xefcdab89;
    ctx->buf[2] = 0x98badcfe;
    ctx->buf[3] = 0x10325476;

    ctx->bits[0] = 0;
    ctx->bits[1] = 0;
}


/* The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  xs_md5_update blocks
 * the data and converts bytes into longwords for this routine.
 */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, data, s) ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

static void xs_md5_transform(guint32 buf[4], guint32 const in[16])
{
    register guint32 a, b, c, d;

    a = buf[0];
    b = buf[1];
    c = buf[2];
    d = buf[3];

    MD5STEP(F1, a, b, c, d, in[ 0] + 0xd76aa478, 7);
    MD5STEP(F1, d, a, b, c, in[ 1] + 0xe8c7b756, 12);
    MD5STEP(F1, c, d, a, b, in[ 2] + 0x242070db, 17);
    MD5STEP(F1, b, c, d, a, in[ 3] + 0xc1bdceee, 22);
    MD5STEP(F1, a, b, c, d, in[ 4] + 0xf57c0faf, 7);
    MD5STEP(F1, d, a, b, c, in[ 5] + 0x4787c62a, 12);
    MD5STEP(F1, c, d, a, b, in[ 6] + 0xa8304613, 17);
    MD5STEP(F1, b, c, d, a, in[ 7] + 0xfd469501, 22);
    MD5STEP(F1, a, b, c, d, in[ 8] + 0x698098d8, 7);
    MD5STEP(F1, d, a, b, c, in[ 9] + 0x8b44f7af, 12);
    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

    MD5STEP(F2, a, b, c, d, in[ 1] + 0xf61e2562, 5);
    MD5STEP(F2, d, a, b, c, in[ 6] + 0xc040b340, 9);
    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
    MD5STEP(F2, b, c, d, a, in[ 0] + 0xe9b6c7aa, 20);
    MD5STEP(F2, a, b, c, d, in[ 5] + 0xd62f105d, 5);
    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
    MD5STEP(F2, b, c, d, a, in[ 4] + 0xe7d3fbc8, 20);
    MD5STEP(F2, a, b, c, d, in[ 9] + 0x21e1cde6, 5);
    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
    MD5STEP(F2, c, d, a, b, in[ 3] + 0xf4d50d87, 14);
    MD5STEP(F2, b, c, d, a, in[ 8] + 0x455a14ed, 20);
    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
    MD5STEP(F2, d, a, b, c, in[ 2] + 0xfcefa3f8, 9);
    MD5STEP(F2, c, d, a, b, in[ 7] + 0x676f02d9, 14);
    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

    MD5STEP(F3, a, b, c, d, in[ 5] + 0xfffa3942, 4);
    MD5STEP(F3, d, a, b, c, in[ 8] + 0x8771f681, 11);
    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
    MD5STEP(F3, a, b, c, d, in[ 1] + 0xa4beea44, 4);
    MD5STEP(F3, d, a, b, c, in[ 4] + 0x4bdecfa9, 11);
    MD5STEP(F3, c, d, a, b, in[ 7] + 0xf6bb4b60, 16);
    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
    MD5STEP(F3, d, a, b, c, in[ 0] + 0xeaa127fa, 11);
    MD5STEP(F3, c, d, a, b, in[ 3] + 0xd4ef3085, 16);
    MD5STEP(F3, b, c, d, a, in[ 6] + 0x04881d05, 23);
    MD5STEP(F3, a, b, c, d, in[ 9] + 0xd9d4d039, 4);
    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
    MD5STEP(F3, b, c, d, a, in[ 2] + 0xc4ac5665, 23);

    MD5STEP(F4, a, b, c, d, in[ 0] + 0xf4292244, 6);
    MD5STEP(F4, d, a, b, c, in[ 7] + 0x432aff97, 10);
    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
    MD5STEP(F4, b, c, d, a, in[ 5] + 0xfc93a039, 21);
    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
    MD5STEP(F4, d, a, b, c, in[ 3] + 0x8f0ccc92, 10);
    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
    MD5STEP(F4, b, c, d, a, in[ 1] + 0x85845dd1, 21);
    MD5STEP(F4, a, b, c, d, in[ 8] + 0x6fa87e4f, 6);
    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
    MD5STEP(F4, c, d, a, b, in[ 6] + 0xa3014314, 15);
    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
    MD5STEP(F4, a, b, c, d, in[ 4] + 0xf7537e82, 6);
    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
    MD5STEP(F4, c, d, a, b, in[ 2] + 0x2ad7d2bb, 15);
    MD5STEP(F4, b, c, d, a, in[ 9] + 0xeb86d391, 21);

    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
}


/* Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
void xs_md5_append(xs_md5state_t *ctx, const guint8 *buf, guint len)
{
    guint32 t;

    /* Update bitcount */
    t = ctx->bits[0];
    if ((ctx->bits[0] = t + ((guint32) len << 3)) < t)
        ctx->bits[1]++;    /* Carry from low to high */
    ctx->bits[1] += len >> 29;

    t = (t >> 3) & 0x3f;    /* Bytes already in shsInfo->data */

    /* Handle any leading odd-sized chunks */
    if (t)
    {
        guint8 *p = (guint8 *) ctx->in + t;

        t = 64 - t;
        if (len < t)
        {
            memcpy(p, buf, len);
            return;
        }
        memcpy(p, buf, t);
        xs_md5_bytereverse(ctx->in, 16);
        xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
        buf += t;
        len -= t;
    }

    /* Process data in 64-byte chunks */
    while (len >= 64)
    {
        memcpy(ctx->in, buf, 64);
        xs_md5_bytereverse(ctx->in, 16);
        xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
        buf += 64;
        len -= 64;
    }

    /* Handle any remaining bytes of data. */
    memcpy(ctx->in, buf, len);
}


/* Final wrapup - pad to 64-byte boundary with the bit pattern 
 * 1 0* (64-bit count of bits processed, MSB-first)
 */
void xs_md5_finish(xs_md5state_t *ctx, xs_md5hash_t digest)
{
    guint count;
    guint8 *p;

    /* Compute number of bytes mod 64 */
    count = (ctx->bits[0] >> 3) & 0x3F;

    /* Set the first char of padding to 0x80.  This is safe since there is
       always at least one byte free */
    p = ctx->in + count;
    *p++ = 0x80;

    /* Bytes of padding needed to make 64 bytes */
    count = 64 - 1 - count;

    /* Pad out to 56 mod 64 */
    if (count < 8)
    {
        /* Two lots of padding:  Pad the first block to 64 bytes */
        memset(p, 0, count);
        xs_md5_bytereverse(ctx->in, 16);
        xs_md5_transform(ctx->buf, (guint32 *) ctx->in);

        /* Now fill the next block with 56 bytes */
        memset(ctx->in, 0, 56);
    }
    else
    {
        /* Pad block to 56 bytes */
        memset(p, 0, count - 8);
    }
    xs_md5_bytereverse(ctx->in, 14);

    /* Append length in bits and transform */
    memcpy(((guint32 *) ctx->in) + 14, &ctx->bits[0], sizeof(guint32));
    memcpy(((guint32 *) ctx->in) + 15, &ctx->bits[1], sizeof(guint32));

    xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
    xs_md5_bytereverse((guint8 *) ctx->buf, 4);
    memcpy(digest, ctx->buf, 16);
    memset(ctx, 0, sizeof(*ctx));
}


/* Copy a given string over in *result.
 */
gint xs_pstrcpy(gchar **result, const gchar *str)
{
    /* Check the string pointers */
    if (!result || !str)
        return -1;

    /* Allocate memory for destination */
    g_free(*result);
    
    *result = (gchar *) g_malloc(strlen(str) + 1);
    if (!*result)
        return -2;

    /* Copy to the destination */
    strcpy(*result, str);

    return 0;
}


/* Concatenates a given string into string pointed by *result.
 */
gint xs_pstrcat(gchar **result, const gchar *str)
{
    /* Check the string pointers */
    if (!result || !str)
        return -1;

    if (*result != NULL)
    {
        *result = (gchar *) g_realloc(*result, strlen(*result) + strlen(str) + 1);
        if (*result == NULL)
            return -1;
        strcat(*result, str);
    }
    else
    {
        *result = (gchar *) g_malloc(strlen(str) + 1);
        if (*result == NULL)
            return -1;
        strcpy(*result, str);
    }

    return 0;
}


/* Concatenate a given string up to given dest size or \n.
 * If size max is reached, change the end to "..."
 */
void xs_pnstrcat(gchar *dest, const size_t size, const gchar *str)
{
    size_t i, n;
    const gchar *s;
    gchar *d;

    for (d = dest, i = 0; *d && i < size; i++, d++);

    s = str;
    while (*s && *s != '\n' && i < size)
    {
        *d = *s;
        d++;
        s++;
        i++;
    }

    *d = 0;

    if (i >= size)
    {
        i--;
        d--;
        for (n = 3; i > 0 && n > 0; d--, i--, n--)
            *d = '.';
    }
}


/* Locate character in string
 */
void xs_findnext(const gchar *str, size_t *pos)
{
    while (str[*pos] && isspace(str[*pos]))
        (*pos)++;
}


void xs_findeol(const gchar *str, size_t *pos)
{
    while (str[*pos] && (str[*pos] != '\n') && (str[*pos] != '\r'))
        (*pos)++;
}


void xs_findnum(const gchar *str, size_t *pos)
{
    while (str[*pos] && isdigit(str[*pos]))
        (*pos)++;
}