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annotate th_ioctx_mem.c @ 692:ea6bcbfb9d18

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Comments and cleanup.
author Matti Hamalainen <ccr@tnsp.org>
date Mon, 09 Mar 2020 17:59:06 +0200
parents 81d1a3f53b87
children a622d21833e1
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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 // Check against max size
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16 if (ctx->maxSize > 0 && newSize > ctx->maxSize)
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17 {
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18 ctx->status = THERR_BOUNDS;
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19 return FALSE;
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20 }
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21
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22 // New size is smaller than old
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23 if (newSize < ctx->memAlloc)
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24 goto out;
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25
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26 // Compute the allocation grow amount
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27 grow = (ctx->minAlloc > 0) ? ctx->minAlloc : 8 * 1024;
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28 if (newSize - ctx->memAlloc > grow)
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29 grow += newSize - ctx->memAlloc;
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30
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31 if (ctx->maxSize > 0 && ctx->memAlloc + grow >= ctx->maxSize)
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32 {
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33 ctx->status = THERR_BOUNDS;
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34 return FALSE;
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35 }
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36
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37 // Grow the buffer
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38 ctx->memAlloc += grow;
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39 if ((ctx->memData = th_realloc(ctx->memData, ctx->memAlloc)) == NULL)
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40 {
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41 ctx->status = THERR_MALLOC;
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42 return FALSE;
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43 }
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44
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45 out:
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46 ctx->memSize = newSize;
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47
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48 return TRUE;
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49 }
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50
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51
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52 static int th_mem_freset(th_ioctx *ctx)
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53 {
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54 ctx->memOffset = 0;
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55 return THERR_OK;
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56 }
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57
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58
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59 static int th_mem_ferror(th_ioctx *ctx)
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60 {
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61 return ctx->status;
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62 }
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63
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64
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65 static int th_mem_fseek(th_ioctx *ctx, const off_t offset, const int whence)
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66 {
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67 off_t newPos;
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68
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69 // Calculate the new position
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70 switch (whence)
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71 {
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72 case SEEK_SET:
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73 newPos = offset;
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74 break;
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75
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76 case SEEK_CUR:
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77 newPos = ctx->memOffset + offset;
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78 break;
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79
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80 case SEEK_END:
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81 newPos = ctx->memSize + offset;
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82 break;
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83
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84 default:
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85 return -1;
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86 }
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87
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88 // Set the new position
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89 ctx->memOffset = newPos;
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90
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91 // Check the new position
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92 if (newPos < 0)
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93 return -1;
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94
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95 //if (!th_mem_realloc(ctx, newPos))
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96 // return -1;
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97
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98 return 0;
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99 }
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100
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101
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102 static off_t th_mem_fsize(th_ioctx *ctx)
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103 {
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104 return ctx->memSize;
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105 }
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106
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107
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108 static off_t th_mem_ftell(th_ioctx *ctx)
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109 {
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110 return ctx->memOffset;
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111 }
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112
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113
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114 static BOOL th_mem_feof(th_ioctx *ctx)
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115 {
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116 return ((size_t) ctx->memOffset) >= ctx->memSize;
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117 }
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118
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119
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120 static int th_mem_fgetc(th_ioctx *ctx)
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121 {
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122 // Check for EOF
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123 if ((size_t) ctx->memOffset < ctx->memSize)
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124 return ctx->memData[ctx->memOffset++];
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125 else
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126 return EOF;
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127 }
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128
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129
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130 static size_t th_mem_fread(void *buf, size_t size, size_t nmemb, th_ioctx *ctx)
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131 {
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132 size_t length = size * nmemb;
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133
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134 // Check if we can read the whole chunk
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135 if (((size_t) ctx->memOffset + length) >= ctx->memSize)
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136 {
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137 nmemb = (ctx->memSize - ctx->memOffset) / size;
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138 length = size * nmemb;
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139 }
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140
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141 memcpy(buf, ctx->memData + ctx->memOffset, length);
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142 ctx->memOffset += length;
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143 return nmemb;
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144 }
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145
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146
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147 static int th_mem_fputc(int ch, th_ioctx *ctx)
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148 {
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149 // Check for EOF
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150 if (!th_mem_realloc(ctx, ctx->memOffset + 1))
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151 return EOF;
681
81d1a3f53b87 Cosmetic.
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152
678
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153 ctx->memData[ctx->memOffset++] = ch;
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154 return ch;
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155 }
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156
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157
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158 static size_t th_mem_fwrite(const void *buf, size_t size, size_t nmemb, th_ioctx *ctx)
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159 {
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160 size_t length = size * nmemb;
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161
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162 // Check if we can write the whole chunk
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163 if (!th_mem_realloc(ctx, ctx->memOffset + length))
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164 {
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165 nmemb = (ctx->memSize - ctx->memOffset) / size;
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166 length = size * nmemb;
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167 }
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168
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169 if (length > 0)
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170 {
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171 memcpy(ctx->memData + ctx->memOffset, buf, length);
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172 ctx->memOffset += length;
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173 }
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174 return nmemb;
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175 }
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176
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177
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178 const th_ioctx_ops th_mem_io_ops =
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179 {
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180 "MemIO",
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181
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182 NULL,
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183 NULL,
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184
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185 th_mem_freset,
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186 th_mem_ferror,
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187 th_mem_fseek,
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188 th_mem_fsize,
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189 th_mem_ftell,
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190 th_mem_feof,
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191 th_mem_fgetc,
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192 th_mem_fputc,
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193 th_mem_fread,
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194 th_mem_fwrite,
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195
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196 NULL,
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197 NULL,
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198 NULL
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199 };