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annotate src/dmgrowbuf.c @ 1458:b2dd6a72d162

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Adjust semantics of growbuf and add new function.
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 10 May 2018 21:00:59 +0300
parents a957b318fbe2
children 1155f4bc4afc
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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 if (buf == NULL)
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24 return DMERR_NULLPTR;
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25
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26 buf->len = 0;
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27 buf->size = initial;
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28 buf->mingrow = mingrow;
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29 buf->allocated = FALSE;
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30
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31 if ((buf->data = dmMalloc(initial)) == NULL)
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32 return DMERR_MALLOC;
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33
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34 return DMERR_OK;
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35 }
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36
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37
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38 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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39 {
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40 int res;
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41 if (pbuf == NULL)
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42 return DMERR_NULLPTR;
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43
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44 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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45 return DMERR_MALLOC;
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46
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47 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK)
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48 {
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49 dmGrowBufFree(*pbuf);
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50 return res;
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51 }
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52
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53 (*pbuf)->allocated = TRUE;
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54 return res;
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55 }
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56
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57
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58 void dmGrowBufFree(DMGrowBuf *buf)
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59 {
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60 if (buf != NULL)
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61 {
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62 dmFreeR(&buf->data);
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63 if (buf->allocated)
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64 dmFree(buf);
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65 }
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66 }
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67
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68
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69 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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70 {
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71 if (buf->data == NULL || buf->len + amount > buf->size)
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72 {
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73 buf->size += amount + (buf->mingrow > 0 ? buf->mingrow : 1024);
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74 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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75 return FALSE;
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76 }
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77
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78 return TRUE;
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79 }
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80
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81
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82 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
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83 {
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84 if (buf->data == NULL || nsize > buf->size)
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85 {
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86 buf->size = nsize + (buf->mingrow > 0 ? buf->mingrow : 1024);
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87 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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88 return FALSE;
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89 }
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90
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91 return TRUE;
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92 }
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93
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94
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95 int dmGrowBufResize(DMGrowBuf *buf)
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96 {
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97 if (buf == NULL)
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98 return DMERR_NULLPTR;
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99
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100 buf->size = buf->len;
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101 if (buf->len == 0)
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102 return DMERR_OK;
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103
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104 if ((buf->data = dmRealloc(buf->data, buf->len)) == NULL)
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105 return DMERR_MALLOC;
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106
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107 return DMERR_OK;
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108 }
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109
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110
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111 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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112 {
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113 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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114 return FALSE;
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115
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116 buf->data[buf->len++] = value;
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117
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118 return TRUE;
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119 }
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120
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121
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122 BOOL dmGrowBufPutStr(DMGrowBuf *buf, const void *str, const size_t len)
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123 {
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124 if (str == NULL)
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125 return FALSE;
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126
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127 if (!dmGrowBufGrow(buf, len + 1))
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128 return FALSE;
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129
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130 memcpy(buf->data + buf->len, str, len + 1);
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131 buf->len += len;
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132
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133 return TRUE;
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134 }
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135
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136
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137 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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138 {
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139 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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140 return FALSE;
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141
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142 buf->data[buf->len++] = (val >> 8) & 0xff;
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143 buf->data[buf->len++] = val & 0xff;
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144
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145 return TRUE;
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146 }
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147
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148
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149 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
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150 {
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151 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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152 return FALSE;
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153
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154 buf->data[buf->len++] = val & 0xff;
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155 buf->data[buf->len++] = (val >> 8) & 0xff;
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156
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157 return TRUE;
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158 }
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159
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160
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161 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
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162 {
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163 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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164 return FALSE;
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165
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166 buf->data[buf->len++] = (val >> 24) & 0xff;
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167 buf->data[buf->len++] = (val >> 16) & 0xff;
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168 buf->data[buf->len++] = (val >> 8) & 0xff;
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169 buf->data[buf->len++] = val & 0xff;
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170
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171 return TRUE;
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172 }
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173
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174
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175 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
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176 {
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177 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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178 return FALSE;
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179
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180 buf->data[buf->len++] = val & 0xff;
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181 buf->data[buf->len++] = (val >> 8) & 0xff;
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182 buf->data[buf->len++] = (val >> 16) & 0xff;
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183 buf->data[buf->len++] = (val >> 24) & 0xff;
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184
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185 return TRUE;
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186 }