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annotate th_ioctx_mem.c @ 681:81d1a3f53b87

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Cosmetic.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 04 Mar 2020 19:47:21 +0200
parents 7e207f1023d9
children ea6bcbfb9d18
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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 BOOL th_mem_realloc(th_ioctx *ctx, const size_t newSize)
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12 {
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13 size_t grow;
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14
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15 if (ctx->maxSize > 0 && newSize > ctx->maxSize)
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16 {
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17 ctx->status = THERR_BOUNDS;
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18 return FALSE;
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19 }
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20
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21 if (newSize < ctx->memAlloc)
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22 return TRUE;
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23
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24 grow = (ctx->minAlloc > 0) ? ctx->minAlloc : 8 * 1024;
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25 if (newSize - ctx->memAlloc > grow)
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26 grow += newSize - ctx->memAlloc;
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27
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28 if (ctx->maxSize > 0 && ctx->memAlloc + grow >= ctx->maxSize)
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29 {
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30 ctx->status = THERR_BOUNDS;
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31 return FALSE;
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32 }
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33
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34 ctx->memAlloc += grow;
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35 if ((ctx->memData = th_realloc(ctx->memData, ctx->memAlloc)) == NULL)
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36 {
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37 ctx->status = THERR_MALLOC;
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38 return FALSE;
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39 }
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40
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41 ctx->memSize = newSize;
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42
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43 return TRUE;
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44 }
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45
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46
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47 static int th_mem_freset(th_ioctx *ctx)
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48 {
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49 ctx->memOffset = 0;
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50 return THERR_OK;
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51 }
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52
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53
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54 static int th_mem_ferror(th_ioctx *ctx)
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55 {
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56 return ctx->status;
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57 }
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58
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59
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60 static int th_mem_fseek(th_ioctx *ctx, const off_t offset, const int whence)
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61 {
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62 off_t newPos;
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63
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64 // Calculate the new position
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65 switch (whence)
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66 {
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67 case SEEK_SET:
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68 newPos = offset;
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69 break;
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70
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71 case SEEK_CUR:
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72 newPos = ctx->memOffset + offset;
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73 break;
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74
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75 case SEEK_END:
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76 newPos = ctx->memSize + offset;
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77 break;
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78
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79 default:
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80 return -1;
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81 }
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82
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83 // Set the new position
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84 ctx->memOffset = newPos;
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85
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86 // Check the new position
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87 if (newPos < 0)
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88 return -1;
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89
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90 //if (!th_mem_realloc(ctx, newPos))
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91 // return -1;
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92
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93 return 0;
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94 }
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95
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96
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97 static off_t th_mem_fsize(th_ioctx *ctx)
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98 {
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99 return ctx->memSize;
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100 }
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101
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102
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103 static off_t th_mem_ftell(th_ioctx *ctx)
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104 {
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105 return ctx->memOffset;
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106 }
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107
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108
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109 static BOOL th_mem_feof(th_ioctx *ctx)
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110 {
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111 return ((size_t) ctx->memOffset) >= ctx->memSize;
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112 }
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113
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114
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115 static int th_mem_fgetc(th_ioctx *ctx)
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116 {
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117 // Check for EOF
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118 if ((size_t) ctx->memOffset < ctx->memSize)
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119 return ctx->memData[ctx->memOffset++];
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120 else
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121 return EOF;
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122 }
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123
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124
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125 static size_t th_mem_fread(void *buf, size_t size, size_t nmemb, th_ioctx *ctx)
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126 {
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127 size_t length = size * nmemb;
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128
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129 // Check if we can read the whole chunk
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130 if (((size_t) ctx->memOffset + length) >= ctx->memSize)
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131 {
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132 nmemb = (ctx->memSize - ctx->memOffset) / size;
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133 length = size * nmemb;
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134 }
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135
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136 memcpy(buf, ctx->memData + ctx->memOffset, length);
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137 ctx->memOffset += length;
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138 return nmemb;
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139 }
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140
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141
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142 static int th_mem_fputc(int ch, th_ioctx *ctx)
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143 {
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144 // Check for EOF
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145 if (!th_mem_realloc(ctx, ctx->memOffset + 1))
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146 return EOF;
681
81d1a3f53b87 Cosmetic.
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147
678
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148 ctx->memData[ctx->memOffset++] = ch;
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149 return ch;
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150 }
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151
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152
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153 static size_t th_mem_fwrite(const void *buf, size_t size, size_t nmemb, th_ioctx *ctx)
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154 {
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155 size_t length = size * nmemb;
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156
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157 // Check if we can write the whole chunk
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158 if (!th_mem_realloc(ctx, ctx->memOffset + length))
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159 {
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160 nmemb = (ctx->memSize - ctx->memOffset) / size;
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161 length = size * nmemb;
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162 }
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163
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164 if (length > 0)
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165 {
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166 memcpy(ctx->memData + ctx->memOffset, buf, length);
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167 ctx->memOffset += length;
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168 }
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169 return nmemb;
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170 }
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171
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172
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173 const th_ioctx_ops th_mem_io_ops =
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174 {
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175 "MemIO",
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176
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177 NULL,
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178 NULL,
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179
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180 th_mem_freset,
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181 th_mem_ferror,
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182 th_mem_fseek,
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183 th_mem_fsize,
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184 th_mem_ftell,
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185 th_mem_feof,
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186 th_mem_fgetc,
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187 th_mem_fputc,
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188 th_mem_fread,
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189 th_mem_fwrite,
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190
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191 NULL,
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192 NULL,
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193 NULL
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194 };