Mercurial > hg > th-libs
annotate th_ioctx_mem.c @ 735:31bc1ed07cf5
Renaming BOOL->bool and TRUE/FALSE to true/false, and using stdbool.h if available.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 07 Dec 2022 12:14:39 +0200 |
parents | 29e44a58bc73 |
children | c17eadc60c3d |
rev | line source |
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1 /* |
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2 * Simple I/O abstraction and context handling layer |
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3 * Programmed and designed by Matti 'ccr' Hamalainen |
726 | 4 * (C) Copyright 2012-2022 Tecnic Software productions (TNSP) |
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5 * |
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6 * Please read file 'COPYING' for information on license and distribution. |
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7 */ |
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8 #include "th_ioctx.h" |
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9 |
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10 |
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11 static int th_mem_fopen(th_ioctx *ctx) |
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12 { |
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13 if (ctx->mode == NULL) |
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14 return THERR_NULLPTR; |
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15 |
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16 // Setup some things based on the mode string |
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17 switch (ctx->mode[0]) |
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18 { |
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19 case 'a': |
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20 // Append |
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21 ctx->memWrite = true; |
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22 ctx->memOffset = ctx->memSize; |
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23 break; |
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24 |
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25 case 'r': |
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26 // Read or read-write |
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27 ctx->memWrite = ctx->mode[1] == '+'; |
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28 ctx->memOffset = 0; |
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29 break; |
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30 |
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31 case 'w': |
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32 // Write, so truncate size |
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33 ctx->memOffset = 0; |
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34 ctx->memSize = 0; |
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35 ctx->memWrite = true; |
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36 break; |
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37 |
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38 default: |
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39 return THERR_INVALID_ARGS; |
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40 } |
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41 |
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42 return THERR_OK; |
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43 } |
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44 |
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45 |
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46 static void th_mem_fclose(th_ioctx *ctx) |
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47 { |
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48 if (ctx->memFree) |
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49 { |
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50 th_free_r(&ctx->memData); |
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51 ctx->memAlloc = 0; |
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52 ctx->memSize = 0; |
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53 } |
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54 } |
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55 |
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56 |
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57 static bool th_mem_realloc(th_ioctx *ctx, const size_t newSize) |
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58 { |
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59 size_t grow; |
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60 |
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61 // Check write flag |
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62 if (!ctx->memWrite) |
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63 { |
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64 ctx->status = THERR_FWRITE; |
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65 return false; |
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66 } |
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67 |
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68 if (ctx->memData == NULL) |
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69 ctx->memAlloc = 0; |
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70 |
692 | 71 // Check against max size |
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72 if (ctx->maxSize > 0 && newSize > ctx->maxSize) |
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73 { |
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74 ctx->status = THERR_BOUNDS; |
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75 return false; |
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76 } |
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77 |
692 | 78 // New size is smaller than old |
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79 if (newSize < ctx->memAlloc) |
692 | 80 goto out; |
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81 |
692 | 82 // Compute the allocation grow amount |
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83 grow = (ctx->minAlloc > 0) ? ctx->minAlloc : 8 * 1024; |
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84 if (newSize - ctx->memAlloc > grow) |
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85 grow += newSize - ctx->memAlloc; |
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86 |
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87 if (ctx->maxSize > 0 && ctx->memAlloc + grow >= ctx->maxSize) |
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88 { |
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89 ctx->status = THERR_BOUNDS; |
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90 return false; |
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91 } |
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92 |
692 | 93 // Grow the buffer |
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94 ctx->memAlloc += grow; |
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95 if ((ctx->memData = th_realloc(ctx->memData, ctx->memAlloc)) == NULL) |
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96 { |
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97 ctx->status = THERR_MALLOC; |
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98 return false; |
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99 } |
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100 |
692 | 101 out: |
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102 ctx->memSize = newSize; |
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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 static int th_mem_freset(th_ioctx *ctx) |
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109 { |
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110 ctx->memOffset = 0; |
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111 return THERR_OK; |
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112 } |
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113 |
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114 |
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115 static int th_mem_ferror(th_ioctx *ctx) |
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116 { |
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117 return ctx->status; |
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118 } |
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119 |
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120 |
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121 static int th_mem_fseek(th_ioctx *ctx, const off_t offset, const int whence) |
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122 { |
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123 off_t newPos; |
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124 |
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125 // Calculate the new position |
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126 switch (whence) |
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127 { |
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128 case SEEK_SET: |
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129 newPos = offset; |
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130 break; |
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131 |
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132 case SEEK_CUR: |
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133 newPos = ctx->memOffset + offset; |
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134 break; |
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135 |
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136 case SEEK_END: |
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137 newPos = ctx->memSize + offset; |
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138 break; |
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139 |
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140 default: |
717
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141 ctx->status = THERR_FSEEK; |
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142 return -1; |
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143 } |
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144 |
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145 // Set the new position |
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146 ctx->memOffset = newPos; |
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147 |
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148 // Check the new position |
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149 if (newPos < 0) |
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150 { |
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151 ctx->status = THERR_FSEEK; |
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152 return -1; |
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153 } |
678
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154 |
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155 //if (!th_mem_realloc(ctx, newPos)) |
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156 // return -1; |
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157 |
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158 return 0; |
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159 } |
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160 |
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161 |
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162 static off_t th_mem_fsize(th_ioctx *ctx) |
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163 { |
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164 return ctx->memSize; |
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165 } |
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166 |
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167 |
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168 static off_t th_mem_ftell(th_ioctx *ctx) |
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169 { |
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170 return ctx->memOffset; |
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171 } |
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172 |
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173 |
735
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174 static bool th_mem_feof(th_ioctx *ctx) |
678
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175 { |
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176 return ((size_t) ctx->memOffset) >= ctx->memSize; |
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177 } |
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178 |
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179 |
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180 static int th_mem_fgetc(th_ioctx *ctx) |
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181 { |
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182 // Check for EOF |
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183 if ((size_t) ctx->memOffset < ctx->memSize) |
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184 return ctx->memData[ctx->memOffset++]; |
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185 else |
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186 return EOF; |
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187 } |
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188 |
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189 |
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190 static size_t th_mem_fread(void *buf, size_t size, size_t nmemb, th_ioctx *ctx) |
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191 { |
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192 size_t length = size * nmemb; |
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193 |
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194 // Check if we can read the whole chunk |
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195 if (((size_t) ctx->memOffset + length) >= ctx->memSize) |
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196 { |
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197 nmemb = (ctx->memSize - ctx->memOffset) / size; |
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198 length = size * nmemb; |
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199 } |
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200 |
718 | 201 if (length > 0) |
202 { | |
203 memcpy(buf, ctx->memData + ctx->memOffset, length); | |
204 ctx->memOffset += length; | |
205 } | |
206 | |
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207 return nmemb; |
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208 } |
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209 |
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210 |
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211 static int th_mem_fputc(int ch, th_ioctx *ctx) |
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212 { |
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213 // Check for EOF |
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214 if (!th_mem_realloc(ctx, ctx->memOffset + 1)) |
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215 return EOF; |
681 | 216 |
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217 ctx->memData[ctx->memOffset++] = ch; |
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218 return ch; |
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219 } |
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220 |
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221 |
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222 static size_t th_mem_fwrite(const void *buf, size_t size, size_t nmemb, th_ioctx *ctx) |
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223 { |
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224 size_t length = size * nmemb; |
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225 |
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226 // Check if we can write the whole chunk |
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227 if (!th_mem_realloc(ctx, ctx->memOffset + length)) |
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228 { |
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229 nmemb = (ctx->memSize - ctx->memOffset) / size; |
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230 length = size * nmemb; |
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231 } |
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232 |
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233 if (length > 0) |
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234 { |
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235 memcpy(ctx->memData + ctx->memOffset, buf, length); |
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236 ctx->memOffset += length; |
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237 } |
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238 return nmemb; |
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239 } |
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240 |
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241 |
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242 const th_ioctx_ops th_mem_io_ops = |
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243 { |
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244 "MemIO", |
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245 |
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246 th_mem_fopen, |
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247 th_mem_fclose, |
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248 |
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249 th_mem_freset, |
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250 th_mem_ferror, |
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251 th_mem_fseek, |
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252 th_mem_fsize, |
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253 th_mem_ftell, |
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254 th_mem_feof, |
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255 th_mem_fgetc, |
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256 th_mem_fputc, |
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257 th_mem_fread, |
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258 th_mem_fwrite, |
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259 |
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260 NULL, |
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261 NULL, |
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262 NULL |
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263 }; |