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annotate src/dmgrowbuf.c @ 1703:fcc568e03bed

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Clarify dmGrowBufGetU8() a bit.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 05 Jun 2018 19:25:39 +0300
parents 94329f678841
children bfba31c09f0b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * DMLib
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3 * -- Growable buffer implementation
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2018 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmgrowbuf.h"
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8
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9 //#define DM_GROWBUF_DEBUG 1
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10
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11 #ifdef DM_GROWBUF_DEBUG
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12 # define DM_DBG(...) do { fprintf(stderr, __VA_ARGS__); } while (0)
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13 #else
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14 # define DM_DBG(...) do { } while (0)
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15 #endif
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16
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17
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18 int dmGrowBufInit(DMGrowBuf *buf)
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19 {
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20 DM_DBG("dmGrowBufInit(%p)\n", buf);
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21
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22 if (buf == NULL)
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23 return DMERR_NULLPTR;
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24
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25 memset(buf, 0, sizeof(DMGrowBuf));
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26
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27 return DMERR_OK;
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28 }
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29
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30
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31 int dmGrowBufAlloc(DMGrowBuf *buf, const size_t initial, const size_t mingrow)
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32 {
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33 int res;
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34
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35 DM_DBG("dmGrowBufAlloc(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n",
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36 buf, initial, mingrow);
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37
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38 if ((res = dmGrowBufInit(buf)) != DMERR_OK)
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39 return res;
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40
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41 buf->len = 0;
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42 buf->offs = 0;
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43 buf->size = initial;
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44 buf->mingrow = mingrow;
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45 buf->allocated = FALSE;
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46 buf->backwards = FALSE;
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47 buf->is_const = FALSE;
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48
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49 // Allocate the data
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50 if ((buf->data = dmMalloc0(initial)) == NULL)
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51 return DMERR_MALLOC;
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52
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53 return DMERR_OK;
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54 }
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55
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56
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57 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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58 {
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59 int res;
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60 if (pbuf == NULL)
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61 return DMERR_NULLPTR;
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62
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63 DM_DBG("dmGrowBufNew(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n",
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64 pbuf, initial, mingrow);
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65
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66 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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67 return DMERR_MALLOC;
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68
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69 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK)
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70 {
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71 // The "allocated" flag has not yet been set
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72 dmGrowBufFree(*pbuf);
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73
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74 // .. thus free the allocated struct here
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75 dmFreeR(pbuf);
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76 return res;
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77 }
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78
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79 (*pbuf)->allocated = TRUE;
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80 return res;
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81 }
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82
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83
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84 void dmGrowBufFree(DMGrowBuf *buf)
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85 {
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86 DM_DBG("dmGrowBufFree(%p)\n", buf);
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87 if (buf != NULL)
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88 {
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89 DM_DBG(
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90 " buf->data = %p\n"
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91 " buf->allocated = %s\n"
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92 " buf->is_const = %s\n",
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93 buf->data,
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94 buf->allocated ? "YES" : "NO",
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95 buf->is_const ? "YES" : "NO");
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96
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97 if (buf->is_const)
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98 return;
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99
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100 dmFreeR(&buf->data);
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101
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102 if (buf->allocated)
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103 dmFree(buf);
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104 }
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105 }
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106
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107
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108 DMGrowBuf * dmGrowBufConstCopy(DMGrowBuf *dst, const DMGrowBuf *src)
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109 {
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110 if (dst == NULL)
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111 return NULL;
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112
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113 DM_DBG("dmGrowBufConstCopy(dst=%p, src=%p):\n"
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114 " data=%p, size=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T ", offs=%" DM_PRIu_SIZE_T "\n",
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115 dst, src, src->data, src->size, src->len, src->offs);
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116
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117 memcpy(dst, src, sizeof(DMGrowBuf));
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118 dst->is_const = TRUE;
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119
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120 return dst;
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121 }
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122
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123
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124 DMGrowBuf * dmGrowBufCreateFrom(DMGrowBuf *dst, Uint8 *data, size_t len)
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125 {
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126 if (dmGrowBufInit(dst) != DMERR_OK)
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127 return NULL;
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128
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129 DM_DBG("dmGrowBufCreateFrom(dst=%p, data=%p, len=%" DM_PRIu_SIZE_T ")\n",
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130 dst, data, len);
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131
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132 dst->data = data;
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133 dst->len = dst->size = len;
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134 dst->is_const = TRUE;
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135
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136 return dst;
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137 }
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138
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139
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140 static BOOL dmGrowBufRealloc(DMGrowBuf *buf, const size_t nsize, const BOOL clear)
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141 {
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142 DM_DBG("dmGrowBufRealloc(%p):\n"
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143 " size=%" DM_PRIu_SIZE_T ", nsize=%" DM_PRIu_SIZE_T
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144 ", offs=%" DM_PRIu_SIZE_T "\n",
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145 buf, buf->size, nsize, buf->offs);
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146
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147 if (buf->is_const)
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148 return FALSE;
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149
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150 // Can't be smaller than current size!
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151 if (nsize < buf->size)
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152 return FALSE;
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153
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154 if ((buf->data = dmRealloc(buf->data, nsize)) == NULL)
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155 return FALSE;
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156
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157 // For buffers growing backwards, we must move the
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158 // current data to the end of the buffer ..
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159 size_t clrsize = nsize - buf->size;
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160 if (buf->backwards)
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161 {
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162 memmove(buf->data + clrsize, buf->data, clrsize);
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163 buf->offs += clrsize;
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164 }
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165
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166 // Check if we need to clear the newly allocated area?
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167 if (clear)
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168 {
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169 if (buf->backwards)
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170 memset(buf->data, 0, clrsize);
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171 else
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172 memset(buf->data + buf->size, 0, clrsize);
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173 }
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174
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175 buf->size = nsize;
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176
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177 return TRUE;
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178 }
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179
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180
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181 //
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182 // Grow the buffer by "amount" bytes, but at least by buf->mingrow,
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183 // if there is not enough space for at least that amount compared to
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184 // current buffer "len".
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185 //
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186 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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187 {
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188 size_t grow = (amount > buf->mingrow) ? amount : buf->mingrow;
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189
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190 if (buf->is_const)
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191 return FALSE;
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192
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193 if (buf->data == NULL ||
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194 (buf->backwards && amount >= buf->offs) ||
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195 (!buf->backwards && buf->offs + amount >= buf->size))
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196 {
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197 if (!dmGrowBufRealloc(buf, buf->size + grow, TRUE))
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198 return FALSE;
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199 }
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200
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201 buf->len += amount;
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202 return TRUE;
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203 }
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204
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205
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206 //
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207 // Grow the buffer if "nsize" is larger than the current buffer size.
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208 // Buffer is enlarged to nsize + mingrow.
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209 //
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210 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
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211 {
1700
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diff changeset
212 if (buf->is_const)
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213 return FALSE;
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diff changeset
214
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diff changeset
215 if (buf->data == NULL || nsize > buf->size)
1455
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216 {
1697
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diff changeset
217 if (!dmGrowBufRealloc(buf, nsize + buf->mingrow, TRUE))
1455
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218 return FALSE;
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diff changeset
219 }
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diff changeset
220
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221 buf->len = nsize;
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222 return TRUE;
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223 }
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diff changeset
224
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diff changeset
225
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226 static void dmGrowBufUpdate(DMGrowBuf *buf)
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227 {
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228 if (buf->offs < buf->min_offs)
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229 buf->min_offs = buf->offs;
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diff changeset
230
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
231 if (buf->offs > buf->max_offs)
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diff changeset
232 buf->max_offs = buf->offs;
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diff changeset
233 }
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diff changeset
234
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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diff changeset
235
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
236 BOOL dmGrowBufPut(DMGrowBuf *buf, const Uint8 *data, const size_t len)
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diff changeset
237 {
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
238 if (data == NULL)
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
239 return FALSE;
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diff changeset
240
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
241 if (!dmGrowBufGrow(buf, len))
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diff changeset
242 return FALSE;
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parents: 1694
diff changeset
243
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
244 if (buf->backwards)
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diff changeset
245 {
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
246 if (buf->literal)
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
247 {
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
248 buf->offs -= len;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
249 memcpy(buf->data + buf->offs, data, len);
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250 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
251 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
252 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
253 for (size_t n = 0; n < len; n++)
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diff changeset
254 buf->data[buf->offs--] = data[n];
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diff changeset
255 }
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
256 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
257 else
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
258 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
259 memcpy(buf->data + buf->offs, data, len);
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diff changeset
260 buf->offs += len;
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Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
261 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
262
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
263 dmGrowBufUpdate(buf);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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diff changeset
264
1455
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diff changeset
265 return TRUE;
a957b318fbe2 Add dmGrowBufCheckGrow() function.
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diff changeset
266 }
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
parents: 1454
diff changeset
267
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
268
1454
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
269 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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parents:
diff changeset
270 {
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parents:
diff changeset
271 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
fff3b58d031c Add a growable buffer implementation.
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272 return FALSE;
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
273
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
274 buf->data[buf->offs] = value;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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275 if (buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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276 buf->offs--;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
277 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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278 buf->offs++;
1454
fff3b58d031c Add a growable buffer implementation.
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279
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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280 dmGrowBufUpdate(buf);
1454
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281
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
282 return TRUE;
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
283 }
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
284
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
285
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
286 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
287 {
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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parents: 1694
diff changeset
288 if (buf->literal && buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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parents: 1694
diff changeset
289 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
290 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
291 !dmGrowBufPutU8(buf, val & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
292 !dmGrowBufPutU8(buf, (val >> 8) & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
293 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
294 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
295 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
296 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
297 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
298 !dmGrowBufPutU8(buf, val & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
299 }
1454
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
300 }
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
301
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
302
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
303 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
304 {
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
305 if (buf->literal && buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
306 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
307 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
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308 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
309 !dmGrowBufPutU8(buf, val & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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diff changeset
310 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
311 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
312 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
313 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
314 !dmGrowBufPutU8(buf, val & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
315 !dmGrowBufPutU8(buf, (val >> 8) & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
316 }
1454
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
317 }
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
318
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
319
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
320 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
321 {
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
322 if (buf->literal && buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
323 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
324 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
325 !dmGrowBufPutU8(buf, (val >> 24) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
326 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
327 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
328 !dmGrowBufPutU8(buf, val & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
329 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
330 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
331 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
332 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
333 !dmGrowBufPutU8(buf, val & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
334 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
335 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
336 !dmGrowBufPutU8(buf, (val >> 24) & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
337 }
1454
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
338 }
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
339
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
340
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
341 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
342 {
1697
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
343 if (buf->literal && buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
344 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
345 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
346 !dmGrowBufPutU8(buf, val & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
347 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
348 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
349 !dmGrowBufPutU8(buf, (val >> 24) & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
350 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
351 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
352 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
353 return
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
354 !dmGrowBufPutU8(buf, (val >> 24) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
355 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
356 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
357 !dmGrowBufPutU8(buf, val & 0xff);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
358 }
1454
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
359 }
1699
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
360
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
361
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
362 BOOL dmGrowBufGetU8(DMGrowBuf *buf, Uint8 *value)
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
363 {
1703
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
364 if (buf->backwards)
1699
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
365 {
1703
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
366 if (buf->offs > 0)
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
367 *value = buf->data[buf->offs--];
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
368 else
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
369 return FALSE;
1699
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
370 }
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
371 else
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
372 {
1703
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
373 if (buf->offs < buf->len)
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
374 *value = buf->data[buf->offs++];
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
375 else
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
376 return FALSE;
1699
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
377 }
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
378
1703
fcc568e03bed Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents: 1702
diff changeset
379 return TRUE;
1699
f71cd6691e05 Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents: 1697
diff changeset
380 }