annotate src/dmgrowbuf.c @ 1687:383ca5f6e78b

Cosmetics.
author Matti Hamalainen <ccr@tnsp.org>
date Fri, 01 Jun 2018 02:21:24 +0300
parents 064fc2e3ee64
children 9611ecd2c4fb
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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
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47 // Allocate the data
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48 if ((buf->adata = buf->data = dmMalloc0(initial)) == NULL)
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49 return DMERR_MALLOC;
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50
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51 return DMERR_OK;
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52 }
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53
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54
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55 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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56 {
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57 int res;
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58 if (pbuf == NULL)
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59 return DMERR_NULLPTR;
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60
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61 DM_DBG("dmGrowBufNew(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n",
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62 pbuf, initial, mingrow);
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63
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64 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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65 return DMERR_MALLOC;
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66
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67 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK)
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68 {
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69 // The "allocated" flag has not yet been set
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70 dmGrowBufFree(*pbuf);
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71
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72 // .. thus free the allocated struct here
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73 dmFreeR(pbuf);
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74 return res;
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75 }
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76
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77 (*pbuf)->allocated = TRUE;
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78 return res;
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79 }
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80
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81
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82 void dmGrowBufFree(DMGrowBuf *buf)
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83 {
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84 DM_DBG("dmGrowBufFree(%p)\n", buf);
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85 if (buf != NULL)
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86 {
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87 DM_DBG(
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88 " buf->adata = %p\n"
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89 " buf->data = %p\n"
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90 " buf->allocated = %s\n",
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91 buf->adata, buf->data, buf->allocated ? "YES" : "NO");
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92
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93 dmFreeR(&buf->adata);
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94 buf->data = NULL;
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95
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96 if (buf->allocated)
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97 dmFree(buf);
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98 }
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99 }
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100
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101
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102 void dmGrowBufPush(DMGrowBuf *buf)
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103 {
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104 if (buf != NULL && buf->adata != NULL)
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105 {
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106 DM_DBG("dmGrowBufPush(%p): size=%" DM_PRIu_SIZE_T "\n"
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107 " nstack=%d [offs=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T "]\n",
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108 buf, buf->size, buf->nstack, buf->offs, buf->len);
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109
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110 buf->stack[buf->nstack].offs = buf->offs;
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111 buf->stack[buf->nstack].len = buf->len;
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112 buf->nstack++;
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113
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114 buf->offs = buf->len;
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115 buf->data = buf->adata + buf->offs;
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116 buf->len = 0;
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117
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118 DM_DBG(
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119 " nstack=%d [offs=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T "]\n",
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120 buf->nstack, buf->offs, buf->len);
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121 }
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122 else
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123 DM_DBG("dmGrowBufPush(%p)\n", buf);
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124 }
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125
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126
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127 void dmGrowBufPop(DMGrowBuf *buf)
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128 {
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129 if (buf != NULL && buf->adata != NULL && buf->nstack > 0)
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130 {
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131 DM_DBG("dmGrowBufPop(%p): size=%" DM_PRIu_SIZE_T "\n"
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132 " nstack=%d [offs=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T "]\n",
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133 buf, buf->size, buf->nstack, buf->offs, buf->len);
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134
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135 buf->nstack--;
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136 buf->offs = buf->stack[buf->nstack].offs;
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137 buf->len += buf->stack[buf->nstack].len;
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138
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139 buf->data = buf->adata + buf->offs;
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140
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141 DM_DBG(
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142 " nstack=%d [offs=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T "]\n",
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143 buf->nstack, buf->offs, buf->len);
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144
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145 }
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146 else
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147 DM_DBG("dmGrowBufPop(%p)\n", buf);
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148 }
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149
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150
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151 static BOOL dmGrowBufRealloc(DMGrowBuf *buf, const size_t nsize, const BOOL clear)
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152 {
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153 DM_DBG("dmGrowBufRealloc(%p): size=%" DM_PRIu_SIZE_T "\n"
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154 " nstack=%d [offs=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T "]\n",
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155 buf, buf->size, buf->nstack, buf->offs, buf->len);
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156
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157 if ((buf->adata = dmRealloc(buf->adata, nsize)) == NULL)
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158 return FALSE;
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159
94eb6a8a7d56 Add helper function dmGrowBufRealloc() to handle the common case of
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160 if (clear)
94eb6a8a7d56 Add helper function dmGrowBufRealloc() to handle the common case of
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161 memset(buf->adata + buf->size, 0, nsize - buf->size);
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162
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163 buf->data = buf->adata + buf->offs;
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164 buf->size = nsize;
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165
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166 return TRUE;
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167 }
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168
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169
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170 //
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171 // Grow the buffer by "amount" bytes, but at least by buf->mingrow,
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172 // if there is not enough space for at least that amount compared to
15afe578f0ae Add few comments to clarify things.
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173 // current buffer "len".
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174 //
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175 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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176 {
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177 if (buf->adata == NULL || buf->offs + buf->len + amount >= buf->size)
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178 {
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179 size_t grow = (amount > buf->mingrow) ? amount : buf->mingrow;
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180 if (!dmGrowBufRealloc(buf, buf->offs + buf->len + grow, TRUE))
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181 return FALSE;
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182 }
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183
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184 return TRUE;
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185 }
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186
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187
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188 //
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189 // Grow the buffer if "nsize" is larger than the current buffer size.
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190 // Buffer is enlarged to nsize + mingrow.
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191 //
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192 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
a957b318fbe2 Add dmGrowBufCheckGrow() function.
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193 {
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194 if (buf->adata == NULL || buf->offs + nsize > buf->size)
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195 {
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196 if (!dmGrowBufRealloc(buf, buf->offs + nsize + buf->mingrow, TRUE))
1455
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197 return FALSE;
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198 }
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199
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200 return TRUE;
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201 }
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202
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203
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204 int dmGrowBufResize(DMGrowBuf *buf)
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205 {
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206 if (buf == NULL)
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207 return DMERR_NULLPTR;
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208
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209 buf->size = buf->len;
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210 if (buf->len == 0)
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211 return DMERR_OK;
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212
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213 if (!dmGrowBufRealloc(buf, buf->size, FALSE))
1454
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214 return DMERR_MALLOC;
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215
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216 return DMERR_OK;
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217 }
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diff changeset
218
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219
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220 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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parents:
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221 {
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diff changeset
222 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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parents:
diff changeset
223 return FALSE;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
224
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225 buf->data[buf->len++] = value;
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226
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diff changeset
227 return TRUE;
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parents:
diff changeset
228 }
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parents:
diff changeset
229
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diff changeset
230
1477
e8fe529f4341 Rename one of the growbuf functions.
Matti Hamalainen <ccr@tnsp.org>
parents: 1459
diff changeset
231 BOOL dmGrowBufPut(DMGrowBuf *buf, const void *str, const size_t len)
1454
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
232 {
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
233 if (str == NULL)
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
234 return FALSE;
fff3b58d031c Add a growable buffer implementation.
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diff changeset
235
1484
a0166c4050be Fix dmGrowBufPut() to not include extra byte.
Matti Hamalainen <ccr@tnsp.org>
parents: 1477
diff changeset
236 if (!dmGrowBufGrow(buf, len))
1454
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diff changeset
237 return FALSE;
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diff changeset
238
1484
a0166c4050be Fix dmGrowBufPut() to not include extra byte.
Matti Hamalainen <ccr@tnsp.org>
parents: 1477
diff changeset
239 memcpy(buf->data + buf->len, str, len);
1454
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diff changeset
240 buf->len += len;
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diff changeset
241
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diff changeset
242 return TRUE;
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parents:
diff changeset
243 }
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diff changeset
244
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diff changeset
245
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diff changeset
246 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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diff changeset
247 {
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parents:
diff changeset
248 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
249 return FALSE;
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diff changeset
250
fff3b58d031c Add a growable buffer implementation.
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diff changeset
251 buf->data[buf->len++] = (val >> 8) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
252 buf->data[buf->len++] = val & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
253
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
254 return TRUE;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
255 }
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
256
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
257
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
258 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
259 {
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
260 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
261 return FALSE;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
262
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
263 buf->data[buf->len++] = val & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
264 buf->data[buf->len++] = (val >> 8) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
265
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diff changeset
266 return TRUE;
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parents:
diff changeset
267 }
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parents:
diff changeset
268
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parents:
diff changeset
269
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diff changeset
270 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
271 {
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
272 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
273 return FALSE;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
274
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
275 buf->data[buf->len++] = (val >> 24) & 0xff;
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
276 buf->data[buf->len++] = (val >> 16) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
277 buf->data[buf->len++] = (val >> 8) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
278 buf->data[buf->len++] = val & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
279
fff3b58d031c Add a growable buffer implementation.
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diff changeset
280 return TRUE;
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parents:
diff changeset
281 }
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parents:
diff changeset
282
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
283
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
284 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
285 {
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
286 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
287 return FALSE;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
288
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
289 buf->data[buf->len++] = val & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
290 buf->data[buf->len++] = (val >> 8) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
291 buf->data[buf->len++] = (val >> 16) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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parents:
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292 buf->data[buf->len++] = (val >> 24) & 0xff;
fff3b58d031c Add a growable buffer implementation.
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293
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294 return TRUE;
fff3b58d031c Add a growable buffer implementation.
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295 }