9 #include "ui/gifrlib.h"
12 /******************************************************************************
13 * Set up the GifFileType structure for use. This must be called first in any *
14 * client program. Then, if custom IO or Error functions are desired, call *
15 * GifSetIOFunc/GifSetErrorFunc, then call EGifInitWrite. Else call *
16 * EGifOpenFileName or EGifOpenFileHandle for standard IO functions. *
17 * If setup fails, a NULL pointer is returned. *
18 ******************************************************************************/
19 GifFileType *GifSetup(void)
24 if ((GifFile = (GifFileType *) malloc(sizeof(GifFileType))) == NULL)
26 memset(GifFile, '\0', sizeof(GifFileType));
27 if ((GifIO = (GifIODataType *) malloc(sizeof(GifIODataType))) == NULL) {
28 free((char *)GifFile);
31 memset(GifIO, '\0', sizeof(GifIODataType));
32 GifFile->GifIO = GifIO;
36 void GifFree(GifFileType * GifFile)
38 GifFilePrivateType *Private;
43 Private = (GifFilePrivateType *) GifFile->Private;
45 if (GifFile->SavedImages)
46 FreeSavedImages(GifFile);
47 if (GifFile->Image.ColorMap)
48 FreeMapObject(GifFile->Image.ColorMap);
49 if (GifFile->SColorMap)
50 FreeMapObject(GifFile->SColorMap);
59 /****************************************************************************
60 * Install the specified ReadFunction into the GifFile specified. *
61 ****************************************************************************/
62 void GifSetReadFunc(GifFileType * GifFile, Gif_rw_func ReadFunc, VoidPtr data)
64 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
65 GifIO->ReadFunc = ReadFunc;
66 GifIO->ReadFunc_data = data;
69 /****************************************************************************
70 * Install the specified WriteFunction into the GifFile specified. *
71 ****************************************************************************/
72 void GifSetWriteFunc(GifFileType * GifFile, Gif_rw_func WriteFunc, VoidPtr data)
74 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
75 GifIO->WriteFunc = WriteFunc;
76 GifIO->WriteFunc_data = data;
79 /****************************************************************************
80 * Install the specified CloseFunction into the GifFile specified. *
81 ****************************************************************************/
82 void GifSetCloseFunc(GifFileType * GifFile, Gif_close_func CloseFunc,
85 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
86 GifIO->CloseFunc = CloseFunc;
87 GifIO->CloseFunc_data = data;
90 /****************************************************************************
91 * Install the standard IO funcs into the GifFile, including the FILE info *
92 ****************************************************************************/
93 void GifStdIOInit(GifFileType * GifFile, FILE * file, int filehandle)
95 GifStdIODataType *IOData;
98 (GifStdIODataType *) malloc(sizeof(GifStdIODataType))) == NULL)
99 GifInternError(GifFile, GIF_ERR_NOT_ENOUGH_MEM);
101 IOData->FileHandle = filehandle;
102 GifSetReadFunc(GifFile, GifStdRead, IOData);
103 GifSetWriteFunc(GifFile, GifStdWrite, IOData);
104 GifSetCloseFunc(GifFile, GifStdFileClose, IOData);
107 size_t GifStdRead(GifByteType * buf, size_t size, VoidPtr method_data)
109 GifStdIODataType *IOtype = (GifStdIODataType *) method_data;
110 return (fread(buf, 1, size, IOtype->File));
113 size_t GifStdWrite(GifByteType * buf, size_t size, VoidPtr method_data)
115 GifStdIODataType *IOtype = (GifStdIODataType *) method_data;
116 return (fwrite(buf, 1, size, IOtype->File));
119 int GifStdFileClose(VoidPtr method_data)
122 GifStdIODataType *IOtype = (GifStdIODataType *) method_data;
123 ret = fclose(IOtype->File);
124 if (ret == 0 && IOtype->FileHandle != -1)
125 ret = close(IOtype->FileHandle);
129 void GifRead(GifByteType * buf, size_t size, GifFileType * GifFile)
131 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
132 if ((*(GifIO->ReadFunc)) (buf, size, GifIO->ReadFunc_data) != size)
133 GifError(GifFile, "Read error!");
136 void GifWrite(GifByteType * buf, size_t size, GifFileType * GifFile)
138 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
139 if ((*(GifIO->WriteFunc)) (buf, size, GifIO->WriteFunc_data) != size)
140 GifError(GifFile, "Write error!");
143 int GifClose(GifFileType * GifFile)
145 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
146 return ((*(GifIO->CloseFunc)) (GifIO->CloseFunc_data));
149 static char *GifErrorString[14] = {
150 "Failed to open given file", /* D_GIF_ERR_OPEN_FAILED */
151 "Failed to read from given file", /* D_GIF_ERR_READ_FAILED */
152 "Given file is NOT a GIF file", /* D_GIF_ERR_NOT_GIF_FILE */
153 "No Screen Descriptor detected", /* D_GIF_ERR_NO_SCRN_DSCR */
154 "No Image Descriptor detected", /* D_GIF_ERR_NO_IMAG_DSCR */
155 "No global or local color map", /* D_GIF_ERR_NO_COLOR_MAP */
156 "Wrong record type detected", /* D_GIF_ERR_WRONG_RECORD */
157 "#Pixels bigger than Width * Height", /* D_GIF_ERR_DATA_TOO_BIG */
158 "Fail to allocate required memory", /* D_GIF_ERR_NOT_ENOUGH_MEM */
159 "Failed to close given file", /* D_GIF_ERR_CLOSE_FAILED */
160 "Given file was not opened for read", /* D_GIF_ERR_CLOSE_FAILED */
161 "Image is defective, decoding aborted", /* D_GIF_ERR_IMAGE_DEFECT */
162 "Image EOF detected before image complete", /* D_GIF_ERR_EOF_TOO_SOON */
166 const char *GetGifError(int error);
168 /*****************************************************************************
169 * Get the last GIF error in human-readable form. *
170 *****************************************************************************/
171 const char *GetGifError(int error)
176 case D_GIF_ERR_OPEN_FAILED:
177 Err = GifErrorString[0];
179 case D_GIF_ERR_READ_FAILED:
180 Err = GifErrorString[1];
182 case D_GIF_ERR_NOT_GIF_FILE:
183 Err = GifErrorString[2];
185 case D_GIF_ERR_NO_SCRN_DSCR:
186 Err = GifErrorString[3];
188 case D_GIF_ERR_NO_IMAG_DSCR:
189 Err = GifErrorString[4];
191 case D_GIF_ERR_NO_COLOR_MAP:
192 Err = GifErrorString[5];
194 case D_GIF_ERR_WRONG_RECORD:
195 Err = GifErrorString[6];
197 case D_GIF_ERR_DATA_TOO_BIG:
198 Err = GifErrorString[7];
200 case D_GIF_ERR_NOT_ENOUGH_MEM:
201 Err = GifErrorString[8];
203 case D_GIF_ERR_CLOSE_FAILED:
204 Err = GifErrorString[9];
206 case D_GIF_ERR_NOT_READABLE:
207 Err = GifErrorString[10];
209 case D_GIF_ERR_IMAGE_DEFECT:
210 Err = GifErrorString[11];
212 case D_GIF_ERR_EOF_TOO_SOON:
213 Err = GifErrorString[12];
216 Err = GifErrorString[13];
222 /******************************
223 * These are called internally *
224 ******************************/
225 void GifError(GifFileType * GifFile, const char *err_str)
227 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
228 if (GifIO->ErrorFunc)
229 (*(GifIO->ErrorFunc)) (err_str, GifIO->ErrorFunc_data);
231 fprintf(stderr, "GIF FATAL ERROR: %s", err_str);
235 void GifWarning(GifFileType * GifFile, const char *err_str)
237 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
238 if (GifIO->WarningFunc)
239 (*(GifIO->WarningFunc)) (err_str, GifIO->WarningFunc_data);
242 void GifInternError(GifFileType * GifFile, int error_num)
244 const char *ErrStr = GetGifError(error_num);
245 GifError(GifFile, ErrStr);
248 void GifInternWarning(GifFileType * GifFile, int error_num)
250 const char *ErrStr = GetGifError(error_num);
251 GifWarning(GifFile, ErrStr);
254 void GifSetErrorFunc(GifFileType * GifFile, Gif_error_func ErrorFunc,
257 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
258 GifIO->ErrorFunc = ErrorFunc;
259 GifIO->ErrorFunc_data = data;
262 void GifSetWarningFunc(GifFileType * GifFile, Gif_error_func WarningFunc,
265 GifIODataType *GifIO = (GifIODataType *) GifFile->GifIO;
266 GifIO->WarningFunc = WarningFunc;
267 GifIO->WarningFunc_data = data;