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annotate src/dmgrowbuf.c @ 1459:1155f4bc4afc

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More work on growbuf.
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 10 May 2018 21:16:43 +0300
parents b2dd6a72d162
children e8fe529f4341
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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 = dmMalloc(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 if (buf->data == NULL || buf->len + amount > buf->size)
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78 {
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79 buf->size += amount + (buf->mingrow > 0 ? buf->mingrow : 1024);
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80 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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81 return FALSE;
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82 }
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83
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84 return TRUE;
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85 }
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86
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87
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88 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
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89 {
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90 if (buf->data == NULL || nsize > buf->size)
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91 {
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92 buf->size = nsize + (buf->mingrow > 0 ? buf->mingrow : 1024);
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93 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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94 return FALSE;
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95 }
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96
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97 return TRUE;
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98 }
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99
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100
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101 int dmGrowBufResize(DMGrowBuf *buf)
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102 {
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103 if (buf == NULL)
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104 return DMERR_NULLPTR;
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105
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106 buf->size = buf->len;
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107 if (buf->len == 0)
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108 return DMERR_OK;
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109
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110 if ((buf->data = dmRealloc(buf->data, buf->len)) == NULL)
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111 return DMERR_MALLOC;
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112
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113 return DMERR_OK;
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114 }
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115
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116
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117 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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118 {
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119 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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120 return FALSE;
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121
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122 buf->data[buf->len++] = value;
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123
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124 return TRUE;
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125 }
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126
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127
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128 BOOL dmGrowBufPutStr(DMGrowBuf *buf, const void *str, const size_t len)
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129 {
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130 if (str == NULL)
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131 return FALSE;
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132
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133 if (!dmGrowBufGrow(buf, len + 1))
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134 return FALSE;
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135
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136 memcpy(buf->data + buf->len, str, len + 1);
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137 buf->len += len;
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138
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139 return TRUE;
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140 }
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141
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142
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143 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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144 {
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145 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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146 return FALSE;
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147
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148 buf->data[buf->len++] = (val >> 8) & 0xff;
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149 buf->data[buf->len++] = val & 0xff;
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150
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151 return TRUE;
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152 }
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153
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154
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155 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
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156 {
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157 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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158 return FALSE;
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159
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160 buf->data[buf->len++] = val & 0xff;
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161 buf->data[buf->len++] = (val >> 8) & 0xff;
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162
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163 return TRUE;
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164 }
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165
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166
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167 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
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168 {
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169 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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170 return FALSE;
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171
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172 buf->data[buf->len++] = (val >> 24) & 0xff;
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173 buf->data[buf->len++] = (val >> 16) & 0xff;
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174 buf->data[buf->len++] = (val >> 8) & 0xff;
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175 buf->data[buf->len++] = val & 0xff;
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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 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
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182 {
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183 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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184 return FALSE;
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185
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186 buf->data[buf->len++] = val & 0xff;
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187 buf->data[buf->len++] = (val >> 8) & 0xff;
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188 buf->data[buf->len++] = (val >> 16) & 0xff;
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189 buf->data[buf->len++] = (val >> 24) & 0xff;
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190
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191 return TRUE;
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192 }