Mercurial > hg > th-libs
annotate th_ioctx_mem.c @ 718:ffd97ca9dfce
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author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 11 Nov 2020 13:23:24 +0200 |
parents | e73200c4584a |
children | d51c277bea6b |
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 |
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4 * (C) Copyright 2012-2020 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 th_free_r(&ctx->memData); |
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50 } |
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51 |
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52 |
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53 static BOOL th_mem_realloc(th_ioctx *ctx, const size_t newSize) |
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54 { |
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55 size_t grow; |
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56 |
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57 // Check write flag |
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58 if (!ctx->memWrite) |
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59 { |
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60 ctx->status = THERR_FWRITE; |
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61 return FALSE; |
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62 } |
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63 |
692 | 64 // Check against max size |
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65 if (ctx->maxSize > 0 && newSize > ctx->maxSize) |
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66 { |
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67 ctx->status = THERR_BOUNDS; |
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68 return FALSE; |
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69 } |
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70 |
692 | 71 // New size is smaller than old |
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72 if (newSize < ctx->memAlloc) |
692 | 73 goto out; |
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74 |
692 | 75 // Compute the allocation grow amount |
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76 grow = (ctx->minAlloc > 0) ? ctx->minAlloc : 8 * 1024; |
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77 if (newSize - ctx->memAlloc > grow) |
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78 grow += newSize - ctx->memAlloc; |
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79 |
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80 if (ctx->maxSize > 0 && ctx->memAlloc + grow >= ctx->maxSize) |
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81 { |
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82 ctx->status = THERR_BOUNDS; |
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83 return FALSE; |
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84 } |
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85 |
692 | 86 // Grow the buffer |
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87 ctx->memAlloc += grow; |
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88 if ((ctx->memData = th_realloc(ctx->memData, ctx->memAlloc)) == NULL) |
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89 { |
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90 ctx->status = THERR_MALLOC; |
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91 return FALSE; |
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92 } |
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93 |
692 | 94 out: |
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95 ctx->memSize = newSize; |
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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 static int th_mem_freset(th_ioctx *ctx) |
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102 { |
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103 ctx->memOffset = 0; |
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104 return THERR_OK; |
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105 } |
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106 |
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107 |
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108 static int th_mem_ferror(th_ioctx *ctx) |
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109 { |
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110 return ctx->status; |
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111 } |
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112 |
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113 |
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114 static int th_mem_fseek(th_ioctx *ctx, const off_t offset, const int whence) |
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115 { |
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116 off_t newPos; |
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117 |
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118 // Calculate the new position |
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119 switch (whence) |
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120 { |
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121 case SEEK_SET: |
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122 newPos = offset; |
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123 break; |
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124 |
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125 case SEEK_CUR: |
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126 newPos = ctx->memOffset + offset; |
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127 break; |
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128 |
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129 case SEEK_END: |
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130 newPos = ctx->memSize + offset; |
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131 break; |
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132 |
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133 default: |
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134 ctx->status = THERR_FSEEK; |
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135 return -1; |
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136 } |
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137 |
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138 // Set the new position |
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139 ctx->memOffset = newPos; |
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140 |
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141 // Check the new position |
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142 if (newPos < 0) |
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143 { |
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144 ctx->status = THERR_FSEEK; |
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145 return -1; |
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146 } |
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147 |
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148 //if (!th_mem_realloc(ctx, newPos)) |
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149 // return -1; |
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150 |
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151 return 0; |
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152 } |
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153 |
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154 |
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155 static off_t th_mem_fsize(th_ioctx *ctx) |
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156 { |
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157 return ctx->memSize; |
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158 } |
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159 |
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160 |
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161 static off_t th_mem_ftell(th_ioctx *ctx) |
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162 { |
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163 return ctx->memOffset; |
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164 } |
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165 |
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166 |
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167 static BOOL th_mem_feof(th_ioctx *ctx) |
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168 { |
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169 return ((size_t) ctx->memOffset) >= ctx->memSize; |
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170 } |
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171 |
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172 |
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173 static int th_mem_fgetc(th_ioctx *ctx) |
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174 { |
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175 // Check for EOF |
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176 if ((size_t) ctx->memOffset < ctx->memSize) |
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177 return ctx->memData[ctx->memOffset++]; |
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178 else |
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179 return EOF; |
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180 } |
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181 |
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182 |
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183 static size_t th_mem_fread(void *buf, size_t size, size_t nmemb, th_ioctx *ctx) |
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184 { |
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185 size_t length = size * nmemb; |
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186 |
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187 // Check if we can read the whole chunk |
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188 if (((size_t) ctx->memOffset + length) >= ctx->memSize) |
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189 { |
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190 nmemb = (ctx->memSize - ctx->memOffset) / size; |
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191 length = size * nmemb; |
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192 } |
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193 |
718 | 194 if (length > 0) |
195 { | |
196 memcpy(buf, ctx->memData + ctx->memOffset, length); | |
197 ctx->memOffset += length; | |
198 } | |
199 | |
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200 return nmemb; |
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201 } |
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202 |
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203 |
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204 static int th_mem_fputc(int ch, th_ioctx *ctx) |
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205 { |
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206 // Check for EOF |
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207 if (!th_mem_realloc(ctx, ctx->memOffset + 1)) |
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208 return EOF; |
681 | 209 |
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210 ctx->memData[ctx->memOffset++] = ch; |
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211 return ch; |
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212 } |
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213 |
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214 |
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215 static size_t th_mem_fwrite(const void *buf, size_t size, size_t nmemb, th_ioctx *ctx) |
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216 { |
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217 size_t length = size * nmemb; |
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218 |
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219 // Check if we can write the whole chunk |
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220 if (!th_mem_realloc(ctx, ctx->memOffset + length)) |
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221 { |
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222 nmemb = (ctx->memSize - ctx->memOffset) / size; |
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223 length = size * nmemb; |
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224 } |
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225 |
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226 if (length > 0) |
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227 { |
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228 memcpy(ctx->memData + ctx->memOffset, buf, length); |
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229 ctx->memOffset += length; |
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230 } |
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231 return nmemb; |
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232 } |
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233 |
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234 |
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235 const th_ioctx_ops th_mem_io_ops = |
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236 { |
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237 "MemIO", |
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238 |
693
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239 th_mem_fopen, |
694
0fc5ddaccc57
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693
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240 th_mem_fclose, |
678
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241 |
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242 th_mem_freset, |
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243 th_mem_ferror, |
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244 th_mem_fseek, |
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245 th_mem_fsize, |
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246 th_mem_ftell, |
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247 th_mem_feof, |
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248 th_mem_fgetc, |
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249 th_mem_fputc, |
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250 th_mem_fread, |
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251 th_mem_fwrite, |
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252 |
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253 NULL, |
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254 NULL, |
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Matti Hamalainen <ccr@tnsp.org>
parents:
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255 NULL |
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Matti Hamalainen <ccr@tnsp.org>
parents:
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256 }; |