The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1 | /****************************************************************************** |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 2 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 3 | dgif_lib.c - GIF decoding |
| 4 | |
| 5 | The functions here and in egif_lib.c are partitioned carefully so that |
| 6 | if you only require one of read and write capability, only one of these |
| 7 | two modules will be linked. Preserve this property! |
| 8 | |
| 9 | *****************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 10 | |
| 11 | #include <stdlib.h> |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 12 | #include <limits.h> |
| 13 | #include <stdint.h> |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 14 | #include <fcntl.h> |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 15 | #include <unistd.h> |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 16 | #include <stdio.h> |
| 17 | #include <string.h> |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 18 | |
| 19 | #ifdef _WIN32 |
| 20 | #include <io.h> |
| 21 | #endif /* _WIN32 */ |
| 22 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 23 | #include "gif_lib.h" |
| 24 | #include "gif_lib_private.h" |
| 25 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 26 | /* compose unsigned little endian value */ |
| 27 | #define UNSIGNED_LITTLE_ENDIAN(lo, hi) ((lo) | ((hi) << 8)) |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 28 | |
| 29 | /* avoid extra function call in case we use fread (TVT) */ |
| 30 | #define READ(_gif,_buf,_len) \ |
| 31 | (((GifFilePrivateType*)_gif->Private)->Read ? \ |
| 32 | ((GifFilePrivateType*)_gif->Private)->Read(_gif,_buf,_len) : \ |
| 33 | fread(_buf,1,_len,((GifFilePrivateType*)_gif->Private)->File)) |
| 34 | |
| 35 | static int DGifGetWord(GifFileType *GifFile, GifWord *Word); |
| 36 | static int DGifSetupDecompress(GifFileType *GifFile); |
| 37 | static int DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line, |
| 38 | int LineLen); |
| 39 | static int DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode); |
| 40 | static int DGifDecompressInput(GifFileType *GifFile, int *Code); |
| 41 | static int DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf, |
| 42 | GifByteType *NextByte); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 43 | |
| 44 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 45 | Open a new GIF file for read, given by its name. |
| 46 | Returns dynamically allocated GifFileType pointer which serves as the GIF |
| 47 | info record. |
| 48 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 49 | GifFileType * |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 50 | DGifOpenFileName(const char *FileName, int *Error) |
| 51 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 52 | int FileHandle; |
| 53 | GifFileType *GifFile; |
| 54 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 55 | if ((FileHandle = open(FileName, O_RDONLY)) == -1) { |
| 56 | if (Error != NULL) |
| 57 | *Error = D_GIF_ERR_OPEN_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 58 | return NULL; |
| 59 | } |
| 60 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 61 | GifFile = DGifOpenFileHandle(FileHandle, Error); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 62 | return GifFile; |
| 63 | } |
| 64 | |
| 65 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 66 | Update a new GIF file, given its file handle. |
| 67 | Returns dynamically allocated GifFileType pointer which serves as the GIF |
| 68 | info record. |
| 69 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 70 | GifFileType * |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 71 | DGifOpenFileHandle(int FileHandle, int *Error) |
| 72 | { |
| 73 | char Buf[GIF_STAMP_LEN + 1]; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 74 | GifFileType *GifFile; |
| 75 | GifFilePrivateType *Private; |
| 76 | FILE *f; |
| 77 | |
| 78 | GifFile = (GifFileType *)malloc(sizeof(GifFileType)); |
| 79 | if (GifFile == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 80 | if (Error != NULL) |
| 81 | *Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
| 82 | (void)close(FileHandle); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 83 | return NULL; |
| 84 | } |
| 85 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 86 | /*@i1@*/memset(GifFile, '\0', sizeof(GifFileType)); |
| 87 | |
| 88 | /* Belt and suspenders, in case the null pointer isn't zero */ |
| 89 | GifFile->SavedImages = NULL; |
| 90 | GifFile->SColorMap = NULL; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 91 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 92 | Private = (GifFilePrivateType *)calloc(1, sizeof(GifFilePrivateType)); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 93 | if (Private == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 94 | if (Error != NULL) |
| 95 | *Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
| 96 | (void)close(FileHandle); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 97 | free((char *)GifFile); |
| 98 | return NULL; |
| 99 | } |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 100 | |
| 101 | /*@i1@*/memset(Private, '\0', sizeof(GifFilePrivateType)); |
| 102 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 103 | #ifdef _WIN32 |
| 104 | _setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */ |
| 105 | #endif /* _WIN32 */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 106 | |
| 107 | f = fdopen(FileHandle, "rb"); /* Make it into a stream: */ |
| 108 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 109 | /*@-mustfreeonly@*/ |
| 110 | GifFile->Private = (void *)Private; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 111 | Private->FileHandle = FileHandle; |
| 112 | Private->File = f; |
| 113 | Private->FileState = FILE_STATE_READ; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 114 | Private->Read = NULL; /* don't use alternate input method (TVT) */ |
| 115 | GifFile->UserData = NULL; /* TVT */ |
| 116 | /*@=mustfreeonly@*/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 117 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 118 | /* Let's see if this is a GIF file: */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 119 | /* coverity[check_return] */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 120 | if (READ(GifFile, (unsigned char *)Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) { |
| 121 | if (Error != NULL) |
| 122 | *Error = D_GIF_ERR_READ_FAILED; |
| 123 | (void)fclose(f); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 124 | free((char *)Private); |
| 125 | free((char *)GifFile); |
| 126 | return NULL; |
| 127 | } |
| 128 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 129 | /* Check for GIF prefix at start of file */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 130 | Buf[GIF_STAMP_LEN] = 0; |
| 131 | if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 132 | if (Error != NULL) |
| 133 | *Error = D_GIF_ERR_NOT_GIF_FILE; |
| 134 | (void)fclose(f); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 135 | free((char *)Private); |
| 136 | free((char *)GifFile); |
| 137 | return NULL; |
| 138 | } |
| 139 | |
| 140 | if (DGifGetScreenDesc(GifFile) == GIF_ERROR) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 141 | (void)fclose(f); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 142 | free((char *)Private); |
| 143 | free((char *)GifFile); |
| 144 | return NULL; |
| 145 | } |
| 146 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 147 | GifFile->Error = 0; |
| 148 | |
| 149 | /* What version of GIF? */ |
| 150 | Private->gif89 = (Buf[GIF_VERSION_POS] == '9'); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 151 | |
| 152 | return GifFile; |
| 153 | } |
| 154 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 155 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 156 | GifFileType constructor with user supplied input function (TVT) |
| 157 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 158 | GifFileType * |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 159 | DGifOpen(void *userData, InputFunc readFunc, int *Error) |
| 160 | { |
| 161 | char Buf[GIF_STAMP_LEN + 1]; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 162 | GifFileType *GifFile; |
| 163 | GifFilePrivateType *Private; |
| 164 | |
| 165 | GifFile = (GifFileType *)malloc(sizeof(GifFileType)); |
| 166 | if (GifFile == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 167 | if (Error != NULL) |
| 168 | *Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | memset(GifFile, '\0', sizeof(GifFileType)); |
| 173 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 174 | /* Belt and suspenders, in case the null pointer isn't zero */ |
| 175 | GifFile->SavedImages = NULL; |
| 176 | GifFile->SColorMap = NULL; |
| 177 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 178 | Private = (GifFilePrivateType *)calloc(1, sizeof(GifFilePrivateType)); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 179 | if (!Private) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 180 | if (Error != NULL) |
| 181 | *Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 182 | free((char *)GifFile); |
| 183 | return NULL; |
| 184 | } |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 185 | /*@i1@*/memset(Private, '\0', sizeof(GifFilePrivateType)); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 186 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 187 | GifFile->Private = (void *)Private; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 188 | Private->FileHandle = 0; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 189 | Private->File = NULL; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 190 | Private->FileState = FILE_STATE_READ; |
| 191 | |
| 192 | Private->Read = readFunc; /* TVT */ |
| 193 | GifFile->UserData = userData; /* TVT */ |
| 194 | |
| 195 | /* Lets see if this is a GIF file: */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 196 | /* coverity[check_return] */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 197 | if (READ(GifFile, (unsigned char *)Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) { |
| 198 | if (Error != NULL) |
| 199 | *Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 200 | free((char *)Private); |
| 201 | free((char *)GifFile); |
| 202 | return NULL; |
| 203 | } |
| 204 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 205 | /* Check for GIF prefix at start of file */ |
| 206 | Buf[GIF_STAMP_LEN] = '\0'; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 207 | if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 208 | if (Error != NULL) |
| 209 | *Error = D_GIF_ERR_NOT_GIF_FILE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 210 | free((char *)Private); |
| 211 | free((char *)GifFile); |
| 212 | return NULL; |
| 213 | } |
| 214 | |
| 215 | if (DGifGetScreenDesc(GifFile) == GIF_ERROR) { |
| 216 | free((char *)Private); |
| 217 | free((char *)GifFile); |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 218 | if (Error != NULL) |
| 219 | *Error = D_GIF_ERR_NO_SCRN_DSCR; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 220 | return NULL; |
| 221 | } |
| 222 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 223 | GifFile->Error = 0; |
| 224 | |
| 225 | /* What version of GIF? */ |
| 226 | Private->gif89 = (Buf[GIF_VERSION_POS] == '9'); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 227 | |
| 228 | return GifFile; |
| 229 | } |
| 230 | |
| 231 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 232 | This routine should be called before any other DGif calls. Note that |
| 233 | this routine is called automatically from DGif file open routines. |
| 234 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 235 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 236 | DGifGetScreenDesc(GifFileType *GifFile) |
| 237 | { |
| 238 | int BitsPerPixel; |
| 239 | bool SortFlag; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 240 | GifByteType Buf[3]; |
| 241 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 242 | |
| 243 | if (!IS_READABLE(Private)) { |
| 244 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 245 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 246 | return GIF_ERROR; |
| 247 | } |
| 248 | |
| 249 | /* Put the screen descriptor into the file: */ |
| 250 | if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR || |
| 251 | DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR) |
| 252 | return GIF_ERROR; |
| 253 | |
| 254 | if (READ(GifFile, Buf, 3) != 3) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 255 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
| 256 | GifFreeMapObject(GifFile->SColorMap); |
| 257 | GifFile->SColorMap = NULL; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 258 | return GIF_ERROR; |
| 259 | } |
| 260 | GifFile->SColorResolution = (((Buf[0] & 0x70) + 1) >> 4) + 1; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 261 | SortFlag = (Buf[0] & 0x08) != 0; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 262 | BitsPerPixel = (Buf[0] & 0x07) + 1; |
| 263 | GifFile->SBackGroundColor = Buf[1]; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 264 | GifFile->AspectByte = Buf[2]; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 265 | if (Buf[0] & 0x80) { /* Do we have global color map? */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 266 | int i; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 267 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 268 | GifFile->SColorMap = GifMakeMapObject(1 << BitsPerPixel, NULL); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 269 | if (GifFile->SColorMap == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 270 | GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 271 | return GIF_ERROR; |
| 272 | } |
| 273 | |
| 274 | /* Get the global color map: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 275 | GifFile->SColorMap->SortFlag = SortFlag; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 276 | for (i = 0; i < GifFile->SColorMap->ColorCount; i++) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 277 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 278 | if (READ(GifFile, Buf, 3) != 3) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 279 | GifFreeMapObject(GifFile->SColorMap); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 280 | GifFile->SColorMap = NULL; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 281 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 282 | return GIF_ERROR; |
| 283 | } |
| 284 | GifFile->SColorMap->Colors[i].Red = Buf[0]; |
| 285 | GifFile->SColorMap->Colors[i].Green = Buf[1]; |
| 286 | GifFile->SColorMap->Colors[i].Blue = Buf[2]; |
| 287 | } |
| 288 | } else { |
| 289 | GifFile->SColorMap = NULL; |
| 290 | } |
| 291 | |
| 292 | return GIF_OK; |
| 293 | } |
| 294 | |
| 295 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 296 | This routine should be called before any attempt to read an image. |
| 297 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 298 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 299 | DGifGetRecordType(GifFileType *GifFile, GifRecordType* Type) |
| 300 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 301 | GifByteType Buf; |
| 302 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 303 | |
| 304 | if (!IS_READABLE(Private)) { |
| 305 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 306 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 307 | return GIF_ERROR; |
| 308 | } |
| 309 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 310 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 311 | if (READ(GifFile, &Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 312 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 313 | return GIF_ERROR; |
| 314 | } |
| 315 | |
| 316 | switch (Buf) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 317 | case DESCRIPTOR_INTRODUCER: |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 318 | *Type = IMAGE_DESC_RECORD_TYPE; |
| 319 | break; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 320 | case EXTENSION_INTRODUCER: |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 321 | *Type = EXTENSION_RECORD_TYPE; |
| 322 | break; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 323 | case TERMINATOR_INTRODUCER: |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 324 | *Type = TERMINATE_RECORD_TYPE; |
| 325 | break; |
| 326 | default: |
| 327 | *Type = UNDEFINED_RECORD_TYPE; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 328 | GifFile->Error = D_GIF_ERR_WRONG_RECORD; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 329 | return GIF_ERROR; |
| 330 | } |
| 331 | |
| 332 | return GIF_OK; |
| 333 | } |
| 334 | |
| 335 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 336 | This routine should be called before any attempt to read an image. |
| 337 | Note it is assumed the Image desc. header has been read. |
| 338 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 339 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 340 | DGifGetImageDesc(GifFileType *GifFile) |
| 341 | { |
| 342 | unsigned int BitsPerPixel; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 343 | GifByteType Buf[3]; |
| 344 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 345 | SavedImage *sp; |
| 346 | |
| 347 | if (!IS_READABLE(Private)) { |
| 348 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 349 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 350 | return GIF_ERROR; |
| 351 | } |
| 352 | |
| 353 | if (DGifGetWord(GifFile, &GifFile->Image.Left) == GIF_ERROR || |
| 354 | DGifGetWord(GifFile, &GifFile->Image.Top) == GIF_ERROR || |
| 355 | DGifGetWord(GifFile, &GifFile->Image.Width) == GIF_ERROR || |
| 356 | DGifGetWord(GifFile, &GifFile->Image.Height) == GIF_ERROR) |
| 357 | return GIF_ERROR; |
| 358 | if (READ(GifFile, Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 359 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
| 360 | GifFreeMapObject(GifFile->Image.ColorMap); |
| 361 | GifFile->Image.ColorMap = NULL; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 362 | return GIF_ERROR; |
| 363 | } |
| 364 | BitsPerPixel = (Buf[0] & 0x07) + 1; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 365 | GifFile->Image.Interlace = (Buf[0] & 0x40) ? true : false; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 366 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 367 | /* Setup the colormap */ |
| 368 | if (GifFile->Image.ColorMap) { |
| 369 | GifFreeMapObject(GifFile->Image.ColorMap); |
| 370 | GifFile->Image.ColorMap = NULL; |
| 371 | } |
| 372 | /* Does this image have local color map? */ |
| 373 | if (Buf[0] & 0x80) { |
| 374 | unsigned int i; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 375 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 376 | GifFile->Image.ColorMap = GifMakeMapObject(1 << BitsPerPixel, NULL); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 377 | if (GifFile->Image.ColorMap == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 378 | GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 379 | return GIF_ERROR; |
| 380 | } |
| 381 | |
| 382 | /* Get the image local color map: */ |
| 383 | for (i = 0; i < GifFile->Image.ColorMap->ColorCount; i++) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 384 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 385 | if (READ(GifFile, Buf, 3) != 3) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 386 | GifFreeMapObject(GifFile->Image.ColorMap); |
| 387 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 388 | GifFile->Image.ColorMap = NULL; |
| 389 | return GIF_ERROR; |
| 390 | } |
| 391 | GifFile->Image.ColorMap->Colors[i].Red = Buf[0]; |
| 392 | GifFile->Image.ColorMap->Colors[i].Green = Buf[1]; |
| 393 | GifFile->Image.ColorMap->Colors[i].Blue = Buf[2]; |
| 394 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | if (GifFile->SavedImages) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 398 | SavedImage* new_saved_images = |
| 399 | (SavedImage *)reallocarray(GifFile->SavedImages, |
| 400 | (GifFile->ImageCount + 1), sizeof(SavedImage)); |
| 401 | if (new_saved_images == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 402 | GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 403 | return GIF_ERROR; |
| 404 | } |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 405 | GifFile->SavedImages = new_saved_images; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 406 | } else { |
| 407 | if ((GifFile->SavedImages = |
| 408 | (SavedImage *) malloc(sizeof(SavedImage))) == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 409 | GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 410 | return GIF_ERROR; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | sp = &GifFile->SavedImages[GifFile->ImageCount]; |
| 415 | memcpy(&sp->ImageDesc, &GifFile->Image, sizeof(GifImageDesc)); |
| 416 | if (GifFile->Image.ColorMap != NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 417 | sp->ImageDesc.ColorMap = GifMakeMapObject( |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 418 | GifFile->Image.ColorMap->ColorCount, |
| 419 | GifFile->Image.ColorMap->Colors); |
| 420 | if (sp->ImageDesc.ColorMap == NULL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 421 | GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 422 | return GIF_ERROR; |
| 423 | } |
| 424 | } |
| 425 | sp->RasterBits = (unsigned char *)NULL; |
| 426 | sp->ExtensionBlockCount = 0; |
| 427 | sp->ExtensionBlocks = (ExtensionBlock *) NULL; |
| 428 | |
| 429 | GifFile->ImageCount++; |
| 430 | |
| 431 | Private->PixelCount = (long)GifFile->Image.Width * |
| 432 | (long)GifFile->Image.Height; |
| 433 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 434 | /* Reset decompress algorithm parameters. */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 435 | return DGifSetupDecompress(GifFile); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 436 | } |
| 437 | |
| 438 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 439 | Get one full scanned line (Line) of length LineLen from GIF file. |
| 440 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 441 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 442 | DGifGetLine(GifFileType *GifFile, GifPixelType *Line, int LineLen) |
| 443 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 444 | GifByteType *Dummy; |
| 445 | GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; |
| 446 | |
| 447 | if (!IS_READABLE(Private)) { |
| 448 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 449 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 450 | return GIF_ERROR; |
| 451 | } |
| 452 | |
| 453 | if (!LineLen) |
| 454 | LineLen = GifFile->Image.Width; |
| 455 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 456 | if ((Private->PixelCount -= LineLen) > 0xffff0000UL) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 457 | GifFile->Error = D_GIF_ERR_DATA_TOO_BIG; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 458 | return GIF_ERROR; |
| 459 | } |
| 460 | |
| 461 | if (DGifDecompressLine(GifFile, Line, LineLen) == GIF_OK) { |
| 462 | if (Private->PixelCount == 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 463 | /* We probably won't be called any more, so let's clean up |
| 464 | * everything before we return: need to flush out all the |
| 465 | * rest of image until an empty block (size 0) |
| 466 | * detected. We use GetCodeNext. |
| 467 | */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 468 | do |
| 469 | if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR) |
| 470 | return GIF_ERROR; |
| 471 | while (Dummy != NULL) ; |
| 472 | } |
| 473 | return GIF_OK; |
| 474 | } else |
| 475 | return GIF_ERROR; |
| 476 | } |
| 477 | |
| 478 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 479 | Put one pixel (Pixel) into GIF file. |
| 480 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 481 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 482 | DGifGetPixel(GifFileType *GifFile, GifPixelType Pixel) |
| 483 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 484 | GifByteType *Dummy; |
| 485 | GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; |
| 486 | |
| 487 | if (!IS_READABLE(Private)) { |
| 488 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 489 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 490 | return GIF_ERROR; |
| 491 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 492 | if (--Private->PixelCount > 0xffff0000UL) |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 493 | { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 494 | GifFile->Error = D_GIF_ERR_DATA_TOO_BIG; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 495 | return GIF_ERROR; |
| 496 | } |
| 497 | |
| 498 | if (DGifDecompressLine(GifFile, &Pixel, 1) == GIF_OK) { |
| 499 | if (Private->PixelCount == 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 500 | /* We probably won't be called any more, so let's clean up |
| 501 | * everything before we return: need to flush out all the |
| 502 | * rest of image until an empty block (size 0) |
| 503 | * detected. We use GetCodeNext. |
| 504 | */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 505 | do |
| 506 | if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR) |
| 507 | return GIF_ERROR; |
| 508 | while (Dummy != NULL) ; |
| 509 | } |
| 510 | return GIF_OK; |
| 511 | } else |
| 512 | return GIF_ERROR; |
| 513 | } |
| 514 | |
| 515 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 516 | Get an extension block (see GIF manual) from GIF file. This routine only |
| 517 | returns the first data block, and DGifGetExtensionNext should be called |
| 518 | after this one until NULL extension is returned. |
| 519 | The Extension should NOT be freed by the user (not dynamically allocated). |
| 520 | Note it is assumed the Extension description header has been read. |
| 521 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 522 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 523 | DGifGetExtension(GifFileType *GifFile, int *ExtCode, GifByteType **Extension) |
| 524 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 525 | GifByteType Buf; |
| 526 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 527 | |
| 528 | if (!IS_READABLE(Private)) { |
| 529 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 530 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 531 | return GIF_ERROR; |
| 532 | } |
| 533 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 534 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 535 | if (READ(GifFile, &Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 536 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 537 | return GIF_ERROR; |
| 538 | } |
| 539 | *ExtCode = Buf; |
| 540 | |
| 541 | return DGifGetExtensionNext(GifFile, Extension); |
| 542 | } |
| 543 | |
| 544 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 545 | Get a following extension block (see GIF manual) from GIF file. This |
| 546 | routine should be called until NULL Extension is returned. |
| 547 | The Extension should NOT be freed by the user (not dynamically allocated). |
| 548 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 549 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 550 | DGifGetExtensionNext(GifFileType *GifFile, GifByteType ** Extension) |
| 551 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 552 | GifByteType Buf; |
| 553 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 554 | |
| 555 | if (READ(GifFile, &Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 556 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 557 | return GIF_ERROR; |
| 558 | } |
| 559 | if (Buf > 0) { |
| 560 | *Extension = Private->Buf; /* Use private unused buffer. */ |
| 561 | (*Extension)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 562 | /* coverity[tainted_data,check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 563 | if (READ(GifFile, &((*Extension)[1]), Buf) != Buf) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 564 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 565 | return GIF_ERROR; |
| 566 | } |
| 567 | } else |
| 568 | *Extension = NULL; |
| 569 | |
| 570 | return GIF_OK; |
| 571 | } |
| 572 | |
| 573 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 574 | Extract a Graphics Control Block from raw extension data |
| 575 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 576 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 577 | int DGifExtensionToGCB(const size_t GifExtensionLength, |
| 578 | const GifByteType *GifExtension, |
| 579 | GraphicsControlBlock *GCB) |
| 580 | { |
| 581 | if (GifExtensionLength != 4) { |
| 582 | return GIF_ERROR; |
| 583 | } |
| 584 | |
| 585 | GCB->DisposalMode = (GifExtension[0] >> 2) & 0x07; |
| 586 | GCB->UserInputFlag = (GifExtension[0] & 0x02) != 0; |
| 587 | GCB->DelayTime = UNSIGNED_LITTLE_ENDIAN(GifExtension[1], GifExtension[2]); |
| 588 | if (GifExtension[0] & 0x01) |
| 589 | GCB->TransparentColor = (int)GifExtension[3]; |
| 590 | else |
| 591 | GCB->TransparentColor = NO_TRANSPARENT_COLOR; |
| 592 | |
| 593 | return GIF_OK; |
| 594 | } |
| 595 | |
| 596 | /****************************************************************************** |
| 597 | Extract the Graphics Control Block for a saved image, if it exists. |
| 598 | ******************************************************************************/ |
| 599 | |
| 600 | int DGifSavedExtensionToGCB(GifFileType *GifFile, |
| 601 | int ImageIndex, GraphicsControlBlock *GCB) |
| 602 | { |
| 603 | int i; |
| 604 | |
| 605 | if (ImageIndex < 0 || ImageIndex > GifFile->ImageCount - 1) |
| 606 | return GIF_ERROR; |
| 607 | |
| 608 | GCB->DisposalMode = DISPOSAL_UNSPECIFIED; |
| 609 | GCB->UserInputFlag = false; |
| 610 | GCB->DelayTime = 0; |
| 611 | GCB->TransparentColor = NO_TRANSPARENT_COLOR; |
| 612 | |
| 613 | for (i = 0; i < GifFile->SavedImages[ImageIndex].ExtensionBlockCount; i++) { |
| 614 | ExtensionBlock *ep = &GifFile->SavedImages[ImageIndex].ExtensionBlocks[i]; |
| 615 | if (ep->Function == GRAPHICS_EXT_FUNC_CODE) |
| 616 | return DGifExtensionToGCB(ep->ByteCount, ep->Bytes, GCB); |
| 617 | } |
| 618 | |
| 619 | return GIF_ERROR; |
| 620 | } |
| 621 | |
| 622 | /****************************************************************************** |
| 623 | This routine should be called last, to close the GIF file. |
| 624 | ******************************************************************************/ |
| 625 | int |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 626 | DGifCloseFile(GifFileType *GifFile, int *ErrorCode) |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 627 | { |
| 628 | GifFilePrivateType *Private; |
| 629 | |
| 630 | if (GifFile == NULL || GifFile->Private == NULL) |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 631 | return GIF_ERROR; |
| 632 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 633 | if (GifFile->Image.ColorMap) { |
| 634 | GifFreeMapObject(GifFile->Image.ColorMap); |
| 635 | GifFile->Image.ColorMap = NULL; |
| 636 | } |
| 637 | |
| 638 | if (GifFile->SColorMap) { |
| 639 | GifFreeMapObject(GifFile->SColorMap); |
| 640 | GifFile->SColorMap = NULL; |
| 641 | } |
| 642 | |
| 643 | if (GifFile->SavedImages) { |
| 644 | GifFreeSavedImages(GifFile); |
| 645 | GifFile->SavedImages = NULL; |
| 646 | } |
| 647 | |
| 648 | GifFreeExtensions(&GifFile->ExtensionBlockCount, &GifFile->ExtensionBlocks); |
| 649 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 650 | Private = (GifFilePrivateType *) GifFile->Private; |
| 651 | |
| 652 | if (!IS_READABLE(Private)) { |
| 653 | /* This file was NOT open for reading: */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 654 | if (ErrorCode != NULL) |
| 655 | *ErrorCode = D_GIF_ERR_NOT_READABLE; |
| 656 | free((char *)GifFile->Private); |
| 657 | free(GifFile); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 658 | return GIF_ERROR; |
| 659 | } |
| 660 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 661 | if (Private->File && (fclose(Private->File) != 0)) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 662 | if (ErrorCode != NULL) |
| 663 | *ErrorCode = D_GIF_ERR_CLOSE_FAILED; |
| 664 | free((char *)GifFile->Private); |
| 665 | free(GifFile); |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 666 | return GIF_ERROR; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 667 | } |
| 668 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 669 | free((char *)GifFile->Private); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 670 | free(GifFile); |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 671 | if (ErrorCode != NULL) |
| 672 | *ErrorCode = D_GIF_SUCCEEDED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 673 | return GIF_OK; |
| 674 | } |
| 675 | |
| 676 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 677 | Get 2 bytes (word) from the given file: |
| 678 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 679 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 680 | DGifGetWord(GifFileType *GifFile, GifWord *Word) |
| 681 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 682 | unsigned char c[2]; |
| 683 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 684 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 685 | if (READ(GifFile, c, 2) != 2) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 686 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 687 | return GIF_ERROR; |
| 688 | } |
| 689 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 690 | *Word = (GifWord)UNSIGNED_LITTLE_ENDIAN(c[0], c[1]); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 691 | return GIF_OK; |
| 692 | } |
| 693 | |
| 694 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 695 | Get the image code in compressed form. This routine can be called if the |
| 696 | information needed to be piped out as is. Obviously this is much faster |
| 697 | than decoding and encoding again. This routine should be followed by calls |
| 698 | to DGifGetCodeNext, until NULL block is returned. |
| 699 | The block should NOT be freed by the user (not dynamically allocated). |
| 700 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 701 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 702 | DGifGetCode(GifFileType *GifFile, int *CodeSize, GifByteType **CodeBlock) |
| 703 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 704 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 705 | |
| 706 | if (!IS_READABLE(Private)) { |
| 707 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 708 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 709 | return GIF_ERROR; |
| 710 | } |
| 711 | |
| 712 | *CodeSize = Private->BitsPerPixel; |
| 713 | |
| 714 | return DGifGetCodeNext(GifFile, CodeBlock); |
| 715 | } |
| 716 | |
| 717 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 718 | Continue to get the image code in compressed form. This routine should be |
| 719 | called until NULL block is returned. |
| 720 | The block should NOT be freed by the user (not dynamically allocated). |
| 721 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 722 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 723 | DGifGetCodeNext(GifFileType *GifFile, GifByteType **CodeBlock) |
| 724 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 725 | GifByteType Buf; |
| 726 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 727 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 728 | /* coverity[tainted_data_argument] */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 729 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 730 | if (READ(GifFile, &Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 731 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 732 | return GIF_ERROR; |
| 733 | } |
| 734 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 735 | /* coverity[lower_bounds] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 736 | if (Buf > 0) { |
| 737 | *CodeBlock = Private->Buf; /* Use private unused buffer. */ |
| 738 | (*CodeBlock)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 739 | /* coverity[tainted_data] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 740 | if (READ(GifFile, &((*CodeBlock)[1]), Buf) != Buf) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 741 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 742 | return GIF_ERROR; |
| 743 | } |
| 744 | } else { |
| 745 | *CodeBlock = NULL; |
| 746 | Private->Buf[0] = 0; /* Make sure the buffer is empty! */ |
| 747 | Private->PixelCount = 0; /* And local info. indicate image read. */ |
| 748 | } |
| 749 | |
| 750 | return GIF_OK; |
| 751 | } |
| 752 | |
| 753 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 754 | Setup the LZ decompression for this image: |
| 755 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 756 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 757 | DGifSetupDecompress(GifFileType *GifFile) |
| 758 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 759 | int i, BitsPerPixel; |
| 760 | GifByteType CodeSize; |
| 761 | GifPrefixType *Prefix; |
| 762 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 763 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 764 | /* coverity[check_return] */ |
| 765 | if (READ(GifFile, &CodeSize, 1) < 1) { /* Read Code size from file. */ |
| 766 | return GIF_ERROR; /* Failed to read Code size. */ |
| 767 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 768 | BitsPerPixel = CodeSize; |
| 769 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 770 | /* this can only happen on a severely malformed GIF */ |
| 771 | if (BitsPerPixel > 8) { |
| 772 | GifFile->Error = D_GIF_ERR_READ_FAILED; /* somewhat bogus error code */ |
| 773 | return GIF_ERROR; /* Failed to read Code size. */ |
| 774 | } |
| 775 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 776 | Private->Buf[0] = 0; /* Input Buffer empty. */ |
| 777 | Private->BitsPerPixel = BitsPerPixel; |
| 778 | Private->ClearCode = (1 << BitsPerPixel); |
| 779 | Private->EOFCode = Private->ClearCode + 1; |
| 780 | Private->RunningCode = Private->EOFCode + 1; |
| 781 | Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */ |
| 782 | Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */ |
| 783 | Private->StackPtr = 0; /* No pixels on the pixel stack. */ |
| 784 | Private->LastCode = NO_SUCH_CODE; |
| 785 | Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */ |
| 786 | Private->CrntShiftDWord = 0; |
| 787 | |
| 788 | Prefix = Private->Prefix; |
| 789 | for (i = 0; i <= LZ_MAX_CODE; i++) |
| 790 | Prefix[i] = NO_SUCH_CODE; |
| 791 | |
| 792 | return GIF_OK; |
| 793 | } |
| 794 | |
| 795 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 796 | The LZ decompression routine: |
| 797 | This version decompress the given GIF file into Line of length LineLen. |
| 798 | This routine can be called few times (one per scan line, for example), in |
| 799 | order the complete the whole image. |
| 800 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 801 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 802 | DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line, int LineLen) |
| 803 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 804 | int i = 0; |
| 805 | int j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr; |
| 806 | GifByteType *Stack, *Suffix; |
| 807 | GifPrefixType *Prefix; |
| 808 | GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; |
| 809 | |
| 810 | StackPtr = Private->StackPtr; |
| 811 | Prefix = Private->Prefix; |
| 812 | Suffix = Private->Suffix; |
| 813 | Stack = Private->Stack; |
| 814 | EOFCode = Private->EOFCode; |
| 815 | ClearCode = Private->ClearCode; |
| 816 | LastCode = Private->LastCode; |
| 817 | |
| 818 | if (StackPtr > LZ_MAX_CODE) { |
| 819 | return GIF_ERROR; |
| 820 | } |
| 821 | |
| 822 | if (StackPtr != 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 823 | /* Let pop the stack off before continueing to read the GIF file: */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 824 | while (StackPtr != 0 && i < LineLen) |
| 825 | Line[i++] = Stack[--StackPtr]; |
| 826 | } |
| 827 | |
| 828 | while (i < LineLen) { /* Decode LineLen items. */ |
| 829 | if (DGifDecompressInput(GifFile, &CrntCode) == GIF_ERROR) |
| 830 | return GIF_ERROR; |
| 831 | |
| 832 | if (CrntCode == EOFCode) { |
| 833 | /* Note however that usually we will not be here as we will stop |
| 834 | * decoding as soon as we got all the pixel, or EOF code will |
| 835 | * not be read at all, and DGifGetLine/Pixel clean everything. */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 836 | GifFile->Error = D_GIF_ERR_EOF_TOO_SOON; |
| 837 | return GIF_ERROR; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 838 | } else if (CrntCode == ClearCode) { |
| 839 | /* We need to start over again: */ |
| 840 | for (j = 0; j <= LZ_MAX_CODE; j++) |
| 841 | Prefix[j] = NO_SUCH_CODE; |
| 842 | Private->RunningCode = Private->EOFCode + 1; |
| 843 | Private->RunningBits = Private->BitsPerPixel + 1; |
| 844 | Private->MaxCode1 = 1 << Private->RunningBits; |
| 845 | LastCode = Private->LastCode = NO_SUCH_CODE; |
| 846 | } else { |
| 847 | /* Its regular code - if in pixel range simply add it to output |
| 848 | * stream, otherwise trace to codes linked list until the prefix |
| 849 | * is in pixel range: */ |
| 850 | if (CrntCode < ClearCode) { |
| 851 | /* This is simple - its pixel scalar, so add it to output: */ |
| 852 | Line[i++] = CrntCode; |
| 853 | } else { |
| 854 | /* Its a code to needed to be traced: trace the linked list |
| 855 | * until the prefix is a pixel, while pushing the suffix |
| 856 | * pixels on our stack. If we done, pop the stack in reverse |
| 857 | * (thats what stack is good for!) order to output. */ |
| 858 | if (Prefix[CrntCode] == NO_SUCH_CODE) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 859 | CrntPrefix = LastCode; |
| 860 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 861 | /* Only allowed if CrntCode is exactly the running code: |
| 862 | * In that case CrntCode = XXXCode, CrntCode or the |
| 863 | * prefix code is last code and the suffix char is |
| 864 | * exactly the prefix of last code! */ |
| 865 | if (CrntCode == Private->RunningCode - 2) { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 866 | Suffix[Private->RunningCode - 2] = |
| 867 | Stack[StackPtr++] = DGifGetPrefixChar(Prefix, |
| 868 | LastCode, |
| 869 | ClearCode); |
| 870 | } else { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 871 | Suffix[Private->RunningCode - 2] = |
| 872 | Stack[StackPtr++] = DGifGetPrefixChar(Prefix, |
| 873 | CrntCode, |
| 874 | ClearCode); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 875 | } |
| 876 | } else |
| 877 | CrntPrefix = CrntCode; |
| 878 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 879 | /* Now (if image is O.K.) we should not get a NO_SUCH_CODE |
| 880 | * during the trace. As we might loop forever, in case of |
| 881 | * defective image, we use StackPtr as loop counter and stop |
| 882 | * before overflowing Stack[]. */ |
| 883 | while (StackPtr < LZ_MAX_CODE && |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 884 | CrntPrefix > ClearCode && CrntPrefix <= LZ_MAX_CODE) { |
| 885 | Stack[StackPtr++] = Suffix[CrntPrefix]; |
| 886 | CrntPrefix = Prefix[CrntPrefix]; |
| 887 | } |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 888 | if (StackPtr >= LZ_MAX_CODE || CrntPrefix > LZ_MAX_CODE) { |
| 889 | GifFile->Error = D_GIF_ERR_IMAGE_DEFECT; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 890 | return GIF_ERROR; |
| 891 | } |
| 892 | /* Push the last character on stack: */ |
| 893 | Stack[StackPtr++] = CrntPrefix; |
| 894 | |
| 895 | /* Now lets pop all the stack into output: */ |
| 896 | while (StackPtr != 0 && i < LineLen) |
| 897 | Line[i++] = Stack[--StackPtr]; |
| 898 | } |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 899 | if (LastCode != NO_SUCH_CODE && Prefix[Private->RunningCode - 2] == NO_SUCH_CODE) { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 900 | Prefix[Private->RunningCode - 2] = LastCode; |
| 901 | |
| 902 | if (CrntCode == Private->RunningCode - 2) { |
| 903 | /* Only allowed if CrntCode is exactly the running code: |
| 904 | * In that case CrntCode = XXXCode, CrntCode or the |
| 905 | * prefix code is last code and the suffix char is |
| 906 | * exactly the prefix of last code! */ |
| 907 | Suffix[Private->RunningCode - 2] = |
| 908 | DGifGetPrefixChar(Prefix, LastCode, ClearCode); |
| 909 | } else { |
| 910 | Suffix[Private->RunningCode - 2] = |
| 911 | DGifGetPrefixChar(Prefix, CrntCode, ClearCode); |
| 912 | } |
| 913 | } |
| 914 | LastCode = CrntCode; |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | Private->LastCode = LastCode; |
| 919 | Private->StackPtr = StackPtr; |
| 920 | |
| 921 | return GIF_OK; |
| 922 | } |
| 923 | |
| 924 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 925 | Routine to trace the Prefixes linked list until we get a prefix which is |
| 926 | not code, but a pixel value (less than ClearCode). Returns that pixel value. |
| 927 | If image is defective, we might loop here forever, so we limit the loops to |
| 928 | the maximum possible if image O.k. - LZ_MAX_CODE times. |
| 929 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 930 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 931 | DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode) |
| 932 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 933 | int i = 0; |
| 934 | |
| 935 | while (Code > ClearCode && i++ <= LZ_MAX_CODE) { |
| 936 | if (Code > LZ_MAX_CODE) { |
| 937 | return NO_SUCH_CODE; |
| 938 | } |
| 939 | Code = Prefix[Code]; |
| 940 | } |
| 941 | return Code; |
| 942 | } |
| 943 | |
| 944 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 945 | Interface for accessing the LZ codes directly. Set Code to the real code |
| 946 | (12bits), or to -1 if EOF code is returned. |
| 947 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 948 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 949 | DGifGetLZCodes(GifFileType *GifFile, int *Code) |
| 950 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 951 | GifByteType *CodeBlock; |
| 952 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 953 | |
| 954 | if (!IS_READABLE(Private)) { |
| 955 | /* This file was NOT open for reading: */ |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 956 | GifFile->Error = D_GIF_ERR_NOT_READABLE; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 957 | return GIF_ERROR; |
| 958 | } |
| 959 | |
| 960 | if (DGifDecompressInput(GifFile, Code) == GIF_ERROR) |
| 961 | return GIF_ERROR; |
| 962 | |
| 963 | if (*Code == Private->EOFCode) { |
| 964 | /* Skip rest of codes (hopefully only NULL terminating block): */ |
| 965 | do { |
| 966 | if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) |
| 967 | return GIF_ERROR; |
| 968 | } while (CodeBlock != NULL) ; |
| 969 | |
| 970 | *Code = -1; |
| 971 | } else if (*Code == Private->ClearCode) { |
| 972 | /* We need to start over again: */ |
| 973 | Private->RunningCode = Private->EOFCode + 1; |
| 974 | Private->RunningBits = Private->BitsPerPixel + 1; |
| 975 | Private->MaxCode1 = 1 << Private->RunningBits; |
| 976 | } |
| 977 | |
| 978 | return GIF_OK; |
| 979 | } |
| 980 | |
| 981 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 982 | The LZ decompression input routine: |
| 983 | This routine is responsable for the decompression of the bit stream from |
| 984 | 8 bits (bytes) packets, into the real codes. |
| 985 | Returns GIF_OK if read successfully. |
| 986 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 987 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 988 | DGifDecompressInput(GifFileType *GifFile, int *Code) |
| 989 | { |
| 990 | static const unsigned short CodeMasks[] = { |
| 991 | 0x0000, 0x0001, 0x0003, 0x0007, |
| 992 | 0x000f, 0x001f, 0x003f, 0x007f, |
| 993 | 0x00ff, 0x01ff, 0x03ff, 0x07ff, |
| 994 | 0x0fff |
| 995 | }; |
| 996 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 997 | GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; |
| 998 | |
| 999 | GifByteType NextByte; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1000 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1001 | /* The image can't contain more than LZ_BITS per code. */ |
| 1002 | if (Private->RunningBits > LZ_BITS) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1003 | GifFile->Error = D_GIF_ERR_IMAGE_DEFECT; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1004 | return GIF_ERROR; |
| 1005 | } |
| 1006 | |
| 1007 | while (Private->CrntShiftState < Private->RunningBits) { |
| 1008 | /* Needs to get more bytes from input stream for next code: */ |
| 1009 | if (DGifBufferedInput(GifFile, Private->Buf, &NextByte) == GIF_ERROR) { |
| 1010 | return GIF_ERROR; |
| 1011 | } |
| 1012 | Private->CrntShiftDWord |= |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1013 | ((unsigned long)NextByte) << Private->CrntShiftState; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1014 | Private->CrntShiftState += 8; |
| 1015 | } |
| 1016 | *Code = Private->CrntShiftDWord & CodeMasks[Private->RunningBits]; |
| 1017 | |
| 1018 | Private->CrntShiftDWord >>= Private->RunningBits; |
| 1019 | Private->CrntShiftState -= Private->RunningBits; |
| 1020 | |
| 1021 | /* If code cannot fit into RunningBits bits, must raise its size. Note |
| 1022 | * however that codes above 4095 are used for special signaling. |
| 1023 | * If we're using LZ_BITS bits already and we're at the max code, just |
| 1024 | * keep using the table as it is, don't increment Private->RunningCode. |
| 1025 | */ |
| 1026 | if (Private->RunningCode < LZ_MAX_CODE + 2 && |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1027 | ++Private->RunningCode > Private->MaxCode1 && |
| 1028 | Private->RunningBits < LZ_BITS) { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1029 | Private->MaxCode1 <<= 1; |
| 1030 | Private->RunningBits++; |
| 1031 | } |
| 1032 | return GIF_OK; |
| 1033 | } |
| 1034 | |
| 1035 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1036 | This routines read one GIF data block at a time and buffers it internally |
| 1037 | so that the decompression routine could access it. |
| 1038 | The routine returns the next byte from its internal buffer (or read next |
| 1039 | block in if buffer empty) and returns GIF_OK if succesful. |
| 1040 | ******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1041 | static int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1042 | DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf, GifByteType *NextByte) |
| 1043 | { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1044 | if (Buf[0] == 0) { |
| 1045 | /* Needs to read the next buffer - this one is empty: */ |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 1046 | /* coverity[check_return] */ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1047 | if (READ(GifFile, Buf, 1) != 1) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1048 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1049 | return GIF_ERROR; |
| 1050 | } |
| 1051 | /* There shouldn't be any empty data blocks here as the LZW spec |
| 1052 | * says the LZW termination code should come first. Therefore we |
| 1053 | * shouldn't be inside this routine at that point. |
| 1054 | */ |
| 1055 | if (Buf[0] == 0) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1056 | GifFile->Error = D_GIF_ERR_IMAGE_DEFECT; |
| 1057 | return GIF_ERROR; |
| 1058 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1059 | if (READ(GifFile, &Buf[1], Buf[0]) != Buf[0]) { |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1060 | GifFile->Error = D_GIF_ERR_READ_FAILED; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1061 | return GIF_ERROR; |
| 1062 | } |
| 1063 | *NextByte = Buf[1]; |
| 1064 | Buf[1] = 2; /* We use now the second place as last char read! */ |
| 1065 | Buf[0]--; |
| 1066 | } else { |
| 1067 | *NextByte = Buf[Buf[1]++]; |
| 1068 | Buf[0]--; |
| 1069 | } |
| 1070 | |
| 1071 | return GIF_OK; |
| 1072 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1073 | |
| 1074 | /****************************************************************************** |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1075 | This routine reads an entire GIF into core, hanging all its state info off |
| 1076 | the GifFileType pointer. Call DGifOpenFileName() or DGifOpenFileHandle() |
| 1077 | first to initialize I/O. Its inverse is EGifSpew(). |
| 1078 | *******************************************************************************/ |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1079 | int |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1080 | DGifSlurp(GifFileType *GifFile) |
| 1081 | { |
| 1082 | size_t ImageSize; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1083 | GifRecordType RecordType; |
| 1084 | SavedImage *sp; |
| 1085 | GifByteType *ExtData; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1086 | int ExtFunction; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1087 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1088 | GifFile->ExtensionBlocks = NULL; |
| 1089 | GifFile->ExtensionBlockCount = 0; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1090 | |
| 1091 | do { |
| 1092 | if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) |
| 1093 | return (GIF_ERROR); |
| 1094 | |
| 1095 | switch (RecordType) { |
| 1096 | case IMAGE_DESC_RECORD_TYPE: |
| 1097 | if (DGifGetImageDesc(GifFile) == GIF_ERROR) |
| 1098 | return (GIF_ERROR); |
| 1099 | |
| 1100 | sp = &GifFile->SavedImages[GifFile->ImageCount - 1]; |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1101 | /* Allocate memory for the image */ |
| 1102 | if (sp->ImageDesc.Width < 0 && sp->ImageDesc.Height < 0 && |
| 1103 | sp->ImageDesc.Width > (INT_MAX / sp->ImageDesc.Height)) { |
| 1104 | return GIF_ERROR; |
| 1105 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1106 | ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height; |
| 1107 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1108 | if (ImageSize > (SIZE_MAX / sizeof(GifPixelType))) { |
| 1109 | return GIF_ERROR; |
| 1110 | } |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 1111 | sp->RasterBits = (unsigned char *)reallocarray(NULL, ImageSize, |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1112 | sizeof(GifPixelType)); |
| 1113 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1114 | if (sp->RasterBits == NULL) { |
| 1115 | return GIF_ERROR; |
| 1116 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1117 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1118 | if (sp->ImageDesc.Interlace) { |
| 1119 | int i, j; |
| 1120 | /* |
| 1121 | * The way an interlaced image should be read - |
| 1122 | * offsets and jumps... |
| 1123 | */ |
| 1124 | int InterlacedOffset[] = { 0, 4, 2, 1 }; |
| 1125 | int InterlacedJumps[] = { 8, 8, 4, 2 }; |
| 1126 | /* Need to perform 4 passes on the image */ |
| 1127 | for (i = 0; i < 4; i++) |
| 1128 | for (j = InterlacedOffset[i]; |
| 1129 | j < sp->ImageDesc.Height; |
| 1130 | j += InterlacedJumps[i]) { |
| 1131 | if (DGifGetLine(GifFile, |
| 1132 | sp->RasterBits+j*sp->ImageDesc.Width, |
| 1133 | sp->ImageDesc.Width) == GIF_ERROR) |
| 1134 | return GIF_ERROR; |
| 1135 | } |
| 1136 | } |
| 1137 | else { |
| 1138 | if (DGifGetLine(GifFile,sp->RasterBits,ImageSize)==GIF_ERROR) |
| 1139 | return (GIF_ERROR); |
| 1140 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1141 | |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1142 | if (GifFile->ExtensionBlocks) { |
| 1143 | sp->ExtensionBlocks = GifFile->ExtensionBlocks; |
| 1144 | sp->ExtensionBlockCount = GifFile->ExtensionBlockCount; |
| 1145 | |
| 1146 | GifFile->ExtensionBlocks = NULL; |
| 1147 | GifFile->ExtensionBlockCount = 0; |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1148 | } |
| 1149 | break; |
| 1150 | |
| 1151 | case EXTENSION_RECORD_TYPE: |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1152 | if (DGifGetExtension(GifFile,&ExtFunction,&ExtData) == GIF_ERROR) |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1153 | return (GIF_ERROR); |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1154 | /* Create an extension block with our data */ |
Joey Pan | b5a8e44 | 2014-06-12 09:08:26 +0800 | [diff] [blame] | 1155 | if (ExtData != NULL) { |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 1156 | if (GifAddExtensionBlock(&GifFile->ExtensionBlockCount, |
| 1157 | &GifFile->ExtensionBlocks, |
| 1158 | ExtFunction, ExtData[0], &ExtData[1]) |
| 1159 | == GIF_ERROR) |
| 1160 | return (GIF_ERROR); |
| 1161 | } |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1162 | while (ExtData != NULL) { |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1163 | if (DGifGetExtensionNext(GifFile, &ExtData) == GIF_ERROR) |
| 1164 | return (GIF_ERROR); |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1165 | /* Continue the extension block */ |
| 1166 | if (ExtData != NULL) |
| 1167 | if (GifAddExtensionBlock(&GifFile->ExtensionBlockCount, |
| 1168 | &GifFile->ExtensionBlocks, |
| 1169 | CONTINUE_EXT_FUNC_CODE, |
| 1170 | ExtData[0], &ExtData[1]) == GIF_ERROR) |
| 1171 | return (GIF_ERROR); |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1172 | } |
| 1173 | break; |
| 1174 | |
| 1175 | case TERMINATE_RECORD_TYPE: |
| 1176 | break; |
| 1177 | |
| 1178 | default: /* Should be trapped by DGifGetRecordType */ |
| 1179 | break; |
| 1180 | } |
| 1181 | } while (RecordType != TERMINATE_RECORD_TYPE); |
| 1182 | |
Leon Scroggins III | df596d3 | 2017-03-13 14:03:21 -0400 | [diff] [blame] | 1183 | /* Sanity check for corrupted file */ |
| 1184 | if (GifFile->ImageCount == 0) { |
| 1185 | GifFile->Error = D_GIF_ERR_NO_IMAG_DSCR; |
| 1186 | return(GIF_ERROR); |
| 1187 | } |
| 1188 | |
The Android Open Source Project | c2eacae | 2009-03-03 19:29:32 -0800 | [diff] [blame] | 1189 | return (GIF_OK); |
| 1190 | } |
Chris Craik | 9aef3ea | 2013-06-24 19:34:25 -0700 | [diff] [blame] | 1191 | |
| 1192 | /* end */ |