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annotate src/dmgrowbuf.c @ 1508:97b8096f16dc

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Initialize the memory in growbuf.
author Matti Hamalainen <ccr@tnsp.org>
date Fri, 11 May 2018 22:22:23 +0300
parents a0166c4050be
children 15afe578f0ae
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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
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10 int dmGrowBufInit(DMGrowBuf *buf)
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11 {
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12 if (buf == NULL)
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13 return DMERR_NULLPTR;
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14
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15 memset(buf, 0, sizeof(DMGrowBuf));
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16
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17 return DMERR_OK;
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18 }
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19
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20
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21 int dmGrowBufAlloc(DMGrowBuf *buf, const size_t initial, const size_t mingrow)
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22 {
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23 int res;
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24
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25 if ((res = dmGrowBufInit(buf)) != DMERR_OK)
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26 return res;
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27
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28 buf->len = 0;
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29 buf->size = initial;
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30 buf->mingrow = mingrow;
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31 buf->allocated = FALSE;
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32
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33 if ((buf->data = dmMalloc0(initial)) == NULL)
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34 return DMERR_MALLOC;
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35
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36 return DMERR_OK;
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37 }
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38
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39
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40 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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41 {
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42 int res;
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43 if (pbuf == NULL)
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44 return DMERR_NULLPTR;
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45
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46 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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47 return DMERR_MALLOC;
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48
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49 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK)
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50 {
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51 // The "allocated" flag has not yet been set
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52 dmGrowBufFree(*pbuf);
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53
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54 // .. thus free the allocated struct here
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55 dmFreeR(pbuf);
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56 return res;
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57 }
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58
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59 (*pbuf)->allocated = TRUE;
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60 return res;
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61 }
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62
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63
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64 void dmGrowBufFree(DMGrowBuf *buf)
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65 {
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66 if (buf != NULL)
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67 {
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68 dmFreeR(&buf->data);
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69 if (buf->allocated)
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70 dmFree(buf);
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71 }
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72 }
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73
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74
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75 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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76 {
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77 size_t grow = (amount > buf->mingrow) ? amount : buf->mingrow;
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78 if (buf->data == NULL || buf->len + grow > buf->size)
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79 {
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80 size_t prev = buf->size;
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81 buf->size += grow;
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82 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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83 return FALSE;
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84
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85 memset(buf->data + prev, 0, buf->size - prev);
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86 }
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87
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88 return TRUE;
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89 }
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90
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91
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92 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
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93 {
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94 if (buf->data == NULL || nsize > buf->size)
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95 {
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96 size_t prev = buf->size;
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97 buf->size = nsize + buf->mingrow;
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98 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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99 return FALSE;
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100
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101 memset(buf->data + prev, 0, buf->size - prev);
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102 }
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103
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104 return TRUE;
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105 }
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106
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107
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108 int dmGrowBufResize(DMGrowBuf *buf)
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109 {
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110 if (buf == NULL)
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111 return DMERR_NULLPTR;
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112
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113 buf->size = buf->len;
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114 if (buf->len == 0)
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115 return DMERR_OK;
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116
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117 if ((buf->data = dmRealloc(buf->data, buf->len)) == NULL)
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118 return DMERR_MALLOC;
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119
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120 return DMERR_OK;
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121 }
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122
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123
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124 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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125 {
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126 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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127 return FALSE;
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128
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129 buf->data[buf->len++] = value;
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130
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131 return TRUE;
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132 }
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133
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134
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135 BOOL dmGrowBufPut(DMGrowBuf *buf, const void *str, const size_t len)
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136 {
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137 if (str == NULL)
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138 return FALSE;
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139
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140 if (!dmGrowBufGrow(buf, len))
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141 return FALSE;
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142
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143 memcpy(buf->data + buf->len, str, len);
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144 buf->len += len;
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145
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146 return TRUE;
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147 }
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148
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149
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150 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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151 {
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152 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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153 return FALSE;
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154
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155 buf->data[buf->len++] = (val >> 8) & 0xff;
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156 buf->data[buf->len++] = val & 0xff;
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157
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158 return TRUE;
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159 }
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160
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161
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162 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
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163 {
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164 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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165 return FALSE;
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166
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167 buf->data[buf->len++] = val & 0xff;
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168 buf->data[buf->len++] = (val >> 8) & 0xff;
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169
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170 return TRUE;
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171 }
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172
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173
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174 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
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175 {
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176 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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177 return FALSE;
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178
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179 buf->data[buf->len++] = (val >> 24) & 0xff;
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180 buf->data[buf->len++] = (val >> 16) & 0xff;
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181 buf->data[buf->len++] = (val >> 8) & 0xff;
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182 buf->data[buf->len++] = val & 0xff;
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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 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
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189 {
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190 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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191 return FALSE;
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192
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193 buf->data[buf->len++] = val & 0xff;
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194 buf->data[buf->len++] = (val >> 8) & 0xff;
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195 buf->data[buf->len++] = (val >> 16) & 0xff;
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196 buf->data[buf->len++] = (val >> 24) & 0xff;
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197
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198 return TRUE;
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199 }