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308
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <unistd.h>
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5 #include "gifrlib.h"
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6
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7 /******************************************************************************
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8 * Set up the GifFileType structure for use. This must be called first in any *
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9 * client program. Then, if custom IO or Error functions are desired, call *
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10 * GifSetIOFunc/GifSetErrorFunc, then call EGifInitWrite. Else call *
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11 * EGifOpenFileName or EGifOpenFileHandle for standard IO functions. *
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12 * If setup fails, a NULL pointer is returned. *
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13 ******************************************************************************/
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14 GifFileType *GifSetup(void)
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15 {
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16 GifIODataType *GifIO;
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17 GifFileType *GifFile;
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18
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19 if ((GifFile = (GifFileType *) malloc(sizeof(GifFileType))) == NULL)
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20 return NULL;
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21 memset(GifFile, '\0', sizeof(GifFileType));
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22 if ((GifIO = (GifIODataType *) malloc(sizeof(GifIODataType))) == NULL) {
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23 free((char *) GifFile);
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24 return NULL;
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25 }
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26 memset(GifIO, '\0', sizeof(GifIODataType));
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27 GifFile->GifIO = GifIO;
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28 return GifFile;
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29 }
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30
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31 void GifFree(GifFileType *GifFile)
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32 {
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33 GifFilePrivateType *Private;
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34
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35 if (GifFile == NULL) return;
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36
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37 Private = (GifFilePrivateType *) GifFile->Private;
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38
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39 if (GifFile->SavedImages)
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40 FreeSavedImages(GifFile);
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41 if (GifFile->Image.ColorMap)
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42 FreeMapObject(GifFile->Image.ColorMap);
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43 if (GifFile->SColorMap)
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44 FreeMapObject(GifFile->SColorMap);
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45 if (Private)
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46 {
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47 free(Private);
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48 }
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49 if (GifFile->GifIO)
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50 free(GifFile->GifIO);
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51 free(GifFile);
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52 }
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53
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54 /****************************************************************************
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55 * Install the specified ReadFunction into the GifFile specified. *
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56 ****************************************************************************/
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57 void GifSetReadFunc(GifFileType *GifFile, Gif_rw_func ReadFunc, VoidPtr data)
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58 {
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59 GifIODataType *GifIO = (GifIODataType *)GifFile->GifIO;
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60 GifIO->ReadFunc = ReadFunc;
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61 GifIO->ReadFunc_data = data;
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62 }
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63
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64 /****************************************************************************
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65 * Install the specified WriteFunction into the GifFile specified. *
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66 ****************************************************************************/
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67 void GifSetWriteFunc(GifFileType *GifFile, Gif_rw_func WriteFunc, VoidPtr data)
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68 {
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69 GifIODataType *GifIO = (GifIODataType *)GifFile->GifIO;
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70 GifIO->WriteFunc = WriteFunc;
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71 GifIO->WriteFunc_data = data;
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72 }
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73
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74 /****************************************************************************
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75 * Install the specified CloseFunction into the GifFile specified. *
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76 ****************************************************************************/
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77 void GifSetCloseFunc(GifFileType *GifFile, Gif_close_func CloseFunc, VoidPtr data)
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78 {
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79 GifIODataType *GifIO = (GifIODataType *)GifFile->GifIO;
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80 GifIO->CloseFunc = CloseFunc;
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81 GifIO->CloseFunc_data = data;
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82 }
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83
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84 /****************************************************************************
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85 * Install the standard IO funcs into the GifFile, including the FILE info *
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86 ****************************************************************************/
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87 void GifStdIOInit(GifFileType *GifFile, FILE *file, int filehandle)
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88 {
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89 GifStdIODataType *IOData;
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90
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91 if ((IOData = (GifStdIODataType*)malloc(sizeof(GifStdIODataType))) == NULL)
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92 GifInternError(GifFile, GIF_ERR_NOT_ENOUGH_MEM);
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93 IOData->File = file;
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94 IOData->FileHandle = filehandle;
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95 GifSetReadFunc(GifFile, GifStdRead, IOData);
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96 GifSetWriteFunc(GifFile, GifStdWrite, IOData);
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97 GifSetCloseFunc(GifFile, GifStdFileClose, IOData);
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98 }
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99
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100 size_t GifStdRead(GifByteType *buf, size_t size, VoidPtr method_data)
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101 {
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102 GifStdIODataType *IOtype = (GifStdIODataType*)method_data;
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103 return (fread(buf, 1, size, IOtype->File));
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104 }
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105
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106 size_t GifStdWrite(GifByteType *buf, size_t size, VoidPtr method_data)
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107 {
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108 GifStdIODataType *IOtype = (GifStdIODataType*)method_data;
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109 return (fwrite(buf, 1, size, IOtype->File));
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110 }
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111
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112 int GifStdFileClose(VoidPtr method_data)
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113 {
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114 int ret;
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115 GifStdIODataType *IOtype = (GifStdIODataType*)method_data;
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116 ret = fclose(IOtype->File);
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117 if (ret == 0 && IOtype->FileHandle != -1)
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118 ret = close(IOtype->FileHandle);
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119 return ret;
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120 }
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121
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122 void GifRead(GifByteType *buf, size_t size, GifFileType *GifFile)
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123 {
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124 GifIODataType *GifIO = (GifIODataType*)GifFile->GifIO;
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125 if ((*(GifIO->ReadFunc))(buf, size, GifIO->ReadFunc_data) != size)
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126 GifError(GifFile, "Read error!");
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127 }
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128
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129 void GifWrite(GifByteType *buf, size_t size, GifFileType *GifFile)
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130 {
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131 GifIODataType *GifIO = (GifIODataType*)GifFile->GifIO;
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132 if ((*(GifIO->WriteFunc))(buf, size, GifIO->WriteFunc_data) != size)
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133 GifError(GifFile, "Write error!");
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134 }
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135
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136 int GifClose(GifFileType *GifFile)
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137 {
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138 GifIODataType *GifIO = (GifIODataType*)GifFile->GifIO;
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139 return ((*(GifIO->CloseFunc))(GifIO->CloseFunc_data));
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140 }
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141
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142 static char *GifErrorString[14] = {
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143 "Failed to open given file", /* D_GIF_ERR_OPEN_FAILED */
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144 "Failed to read from given file", /* D_GIF_ERR_READ_FAILED */
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145 "Given file is NOT a GIF file", /* D_GIF_ERR_NOT_GIF_FILE */
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146 "No Screen Descriptor detected", /* D_GIF_ERR_NO_SCRN_DSCR */
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147 "No Image Descriptor detected", /* D_GIF_ERR_NO_IMAG_DSCR */
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148 "No global or local color map", /* D_GIF_ERR_NO_COLOR_MAP */
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149 "Wrong record type detected", /* D_GIF_ERR_WRONG_RECORD */
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150 "#Pixels bigger than Width * Height", /* D_GIF_ERR_DATA_TOO_BIG */
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151 "Fail to allocate required memory", /* D_GIF_ERR_NOT_ENOUGH_MEM */
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152 "Failed to close given file", /* D_GIF_ERR_CLOSE_FAILED */
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153 "Given file was not opened for read", /* D_GIF_ERR_CLOSE_FAILED */
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154 "Image is defective, decoding aborted", /* D_GIF_ERR_IMAGE_DEFECT */
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155 "Image EOF detected before image complete", /* D_GIF_ERR_EOF_TOO_SOON */
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156 "Undefined error!",
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157 };
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158
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159 const char *GetGifError(int error);
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160
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161 /*****************************************************************************
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162 * Get the last GIF error in human-readable form. *
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163 *****************************************************************************/
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164 const char *GetGifError(int error)
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165 {
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166 char *Err;
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167
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168 switch(error) {
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169 case D_GIF_ERR_OPEN_FAILED:
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170 Err = GifErrorString[0];
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171 break;
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172 case D_GIF_ERR_READ_FAILED:
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173 Err = GifErrorString[1];
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174 break;
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175 case D_GIF_ERR_NOT_GIF_FILE:
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176 Err = GifErrorString[2];
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177 break;
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178 case D_GIF_ERR_NO_SCRN_DSCR:
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179 Err = GifErrorString[3];
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180 break;
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181 case D_GIF_ERR_NO_IMAG_DSCR:
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182 Err = GifErrorString[4];
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183 break;
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184 case D_GIF_ERR_NO_COLOR_MAP:
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185 Err = GifErrorString[5];
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186 break;
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187 case D_GIF_ERR_WRONG_RECORD:
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188 Err = GifErrorString[6];
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189 break;
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190 case D_GIF_ERR_DATA_TOO_BIG:
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191 Err = GifErrorString[7];
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192 break;
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193 case D_GIF_ERR_NOT_ENOUGH_MEM:
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194 Err = GifErrorString[8];
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195 break;
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196 case D_GIF_ERR_CLOSE_FAILED:
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197 Err = GifErrorString[9];
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198 break;
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199 case D_GIF_ERR_NOT_READABLE:
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200 Err = GifErrorString[10];
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201 break;
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202 case D_GIF_ERR_IMAGE_DEFECT:
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203 Err = GifErrorString[11];
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204 break;
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205 case D_GIF_ERR_EOF_TOO_SOON:
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206 Err = GifErrorString[12];
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207 break;
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208 default:
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209 Err = GifErrorString[13];
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210 break;
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211 }
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212 return Err;
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213 }
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214
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215 /******************************
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216 * These are called internally *
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217 ******************************/
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218 void GifError(GifFileType *GifFile, const char *err_str)
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219 {
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220 GifIODataType *GifIO = (GifIODataType*)GifFile->GifIO;
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221 if (GifIO->ErrorFunc)
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222 (*(GifIO->ErrorFunc))(err_str, GifIO->ErrorFunc_data);
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223 else
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224 fprintf(stderr, "GIF FATAL ERROR: %s", err_str);
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225 exit(-10);
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226 }
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227
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228 void GifWarning(GifFileType *GifFile, const char *err_str)
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229 {
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230 GifIODataType *GifIO = (GifIODataType*)GifFile->GifIO;
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231 if (GifIO->WarningFunc)
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232 (*(GifIO->WarningFunc))(err_str, GifIO->WarningFunc_data);
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233 }
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234
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235 void GifInternError(GifFileType *GifFile, int error_num)
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236 {
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237 const char *ErrStr = GetGifError(error_num);
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238 GifError(GifFile, ErrStr);
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239 }
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240
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241 void GifInternWarning(GifFileType *GifFile, int error_num)
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242 {
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243 const char *ErrStr = GetGifError(error_num);
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244 GifWarning(GifFile, ErrStr);
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245 }
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246
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247 void GifSetErrorFunc(GifFileType *GifFile, Gif_error_func ErrorFunc, VoidPtr data)
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248 {
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249 GifIODataType *GifIO = (GifIODataType *)GifFile->GifIO;
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250 GifIO->ErrorFunc = ErrorFunc;
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251 GifIO->ErrorFunc_data = data;
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252 }
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253
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254 void GifSetWarningFunc(GifFileType *GifFile, Gif_error_func WarningFunc, VoidPtr data)
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255 {
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256 GifIODataType *GifIO = (GifIODataType *)GifFile->GifIO;
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257 GifIO->WarningFunc = WarningFunc;
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258 GifIO->WarningFunc_data = data;
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259 }
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