diff options
Diffstat (limited to 'hl/tools/gif2h5/decompress.c')
| -rw-r--r-- | hl/tools/gif2h5/decompress.c | 233 |
1 files changed, 124 insertions, 109 deletions
diff --git a/hl/tools/gif2h5/decompress.c b/hl/tools/gif2h5/decompress.c index 6668c22..ca33f86 100644 --- a/hl/tools/gif2h5/decompress.c +++ b/hl/tools/gif2h5/decompress.c @@ -6,7 +6,7 @@ * This file is part of HDF5. The full HDF5 copyright notice, including * * terms governing use, modification, and redistribution, is contained in * * the COPYING file, which can be found at the root of the source code * - * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. * + * distribution tree, or in https://www.hdfgroup.org/licenses. * * If you do not have access to either file, you may request a copy from * * help@hdfgroup.org. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ @@ -15,65 +15,63 @@ #include "gif.h" -WORD iWIDE, iHIGH, eWIDE, eHIGH, expand, numcols, strip, nostrip; -unsigned long cols[256]; -char *cmd; +GIFWORD iWIDE, iHIGH, eWIDE, eHIGH, expand, numcols, strip, nostrip; +unsigned long cols[256]; +char * cmd; FILE *fp; -static WORD - XC = 0, YC = 0, /* Output X and Y coords of current pixel */ - InitCodeSize, /* Starting code size, used during Clear */ - CodeSize, /* Code size, read from GIF header */ - BytesPerScanline, /* Bytes per scanline in output raster */ - IWidth, IHeight; /* image dimensions */ -static int - BitOffset = 0, /* Bit Offset of next code */ - Pass = 0, /* Used by output routine if WORDerlaced pic */ - OutCount = 0, /* Decompressor output 'stack count' */ - Code, /* Value returned by ReadCode */ - MaxCode, /* limiting value for current code size */ - ClearCode, /* GIF clear code */ - EOFCode, /* GIF end-of-information code */ - CurCode, OldCode, InCode, /* Decompressor variables */ - FirstFree, /* First free code, generated per GIF spec */ - FreeCode, /* Decompressor, next free slot in hash table */ - FinChar, /* Decompressor variable */ - DataMask, /* AND mask for data size */ - ReadMask; /* Code AND mask for current code size */ +static GIFWORD XC = 0, YC = 0, /* Output X and Y coords of current pixel */ + InitCodeSize, /* Starting code size, used during Clear */ + CodeSize, /* Code size, read from GIF header */ + BytesPerScanline, /* Bytes per scanline in output raster */ + IWidth, IHeight; /* image dimensions */ +static int BitOffset = 0, /* Bit Offset of next code */ + Pass = 0, /* Used by output routine if GIFWORDerlaced pic */ + OutCount = 0, /* Decompressor output 'stack count' */ + Code, /* Value returned by ReadCode */ + MaxCode, /* limiting value for current code size */ + ClearCode, /* GIF clear code */ + EOFCode, /* GIF end-of-information code */ + CurCode, OldCode, InCode, /* Decompressor variables */ + FirstFree, /* First free code, generated per GIF spec */ + FreeCode, /* Decompressor, next free slot in hash table */ + FinChar, /* Decompressor variable */ + DataMask, /* AND mask for data size */ + ReadMask; /* Code AND mask for current code size */ /*MODIFICATIONS*/ -BYTE tempbyte[10]; -BYTE * tempBYTEptr[10]; -WORD tempint[10]; -WORD ImageCount = 0; +GIFBYTE tempbyte[10]; +GIFBYTE *tempGIFBYTEptr[10]; +GIFWORD tempint[10]; +GIFWORD ImageCount = 0; /*END MODIFICATION*/ boolean Interlace, HasColormap; -BYTE *Image; /* The result array */ -BYTE *RawGIF; /* The heap array to hold it, raw */ -BYTE *Raster; /* The raster data stream, unblocked */ +GIFBYTE *Image; /* The result array */ +GIFBYTE *RawGIF; /* The heap array to hold it, raw */ +GIFBYTE *Raster; /* The raster data stream, unblocked */ /* The hash table used by the decompressor */ -int Prefix[4096]; -int Suffix[4096]; +int *Prefix; +int *Suffix; /* An output array used by the decompressor */ -int OutCode[1025]; +int *OutCode; /* The color map, read from the GIF header */ -int numused; +int numused; /* * Fetch the next code from the raster data stream. The codes can be any - * length from 3 to 12 bits, packed WORDo 8-bit BYTEs, so we have to maWORDain - * our location in the Raster array as a BIT Offset. We compute the BYTE - * Offset WORDo the raster array by dividing this by 8, pick up three BYTEs, - * compute the bit Offset WORDo our 24-bit chunk, shift to bring the desired + * length from 3 to 12 bits, packed into 8-bit GIFBYTEs, so we have to maintain + * our location in the Raster array as a BIT Offset. We compute the GIFBYTE + * Offset into the raster array by dividing this by 8, pick up three GIFBYTEs, + * compute the bit Offset into our 24-bit chunk, shift to bring the desired * code to the bottom, then mask it off and return it. */ static int @@ -82,7 +80,7 @@ ReadCode(void) int RawCode, ByteOffset; ByteOffset = BitOffset / 8; - RawCode = Raster[ByteOffset] + (0x100 * Raster[ByteOffset + 1]); + RawCode = Raster[ByteOffset] + (0x100 * Raster[ByteOffset + 1]); if (CodeSize >= 8) RawCode += (0x10000 * Raster[ByteOffset + 2]); @@ -93,19 +91,17 @@ ReadCode(void) } static void -AddToPixel(BYTE Index) +AddToPixel(GIFBYTE Index) { - if (YC<IHeight) - *(Image + YC * BytesPerScanline + XC) = Index; - - + if (YC < IHeight) + *(Image + YC * BytesPerScanline + XC) = Index; /* Update the X-coordinate, and if it overflows, update the * Y-coordinate */ if (++XC == IWidth) { /* - * If a non-WORDerlaced picture, just increment YC to the next scan - * line. If it's WORDerlaced, deal with the WORDerlace as described + * If a non-interlaced picture, just increment YC to the next scan + * line. If it's interlaced, deal with the interlace as described * in the GIF spec. Put the decoded scan line out to the screen if we * haven't gone past the bottom of it. */ @@ -113,40 +109,41 @@ AddToPixel(BYTE Index) if (!Interlace) { YC++; - } else { + } + else { switch (Pass) { - case 0: - YC += 8; - - if (YC >= IHeight) { - Pass++; - YC = 4; - } - - break; - case 1: - YC += 8; - - if (YC >= IHeight) { - Pass++; - YC = 2; - } - - break; - case 2: - YC += 4; - - if (YC >= IHeight) { - Pass++; - YC = 1; - } - - break; - case 3: - YC += 2; - break; - default: - break; + case 0: + YC += 8; + + if (YC >= IHeight) { + Pass++; + YC = 4; + } + + break; + case 1: + YC += 8; + + if (YC >= IHeight) { + Pass++; + YC = 2; + } + + break; + case 2: + YC += 4; + + if (YC >= IHeight) { + Pass++; + YC = 1; + } + + break; + case 3: + YC += 2; + break; + default: + break; } } } @@ -154,26 +151,39 @@ AddToPixel(BYTE Index) /* Main routine. Convert a GIF image to an HDF image */ -BYTE * +GIFBYTE * Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) { int i; - XC = 0; - YC = 0; - Pass = 0; - OutCount = 0; + if (!(Prefix = calloc(4096, sizeof(int)))) { + printf("Out of memory"); + exit(EXIT_FAILURE); + } + if (!(Suffix = calloc(4096, sizeof(int)))) { + printf("Out of memory"); + exit(EXIT_FAILURE); + } + if (!(OutCode = calloc(1024, sizeof(int)))) { + printf("Out of memory"); + exit(EXIT_FAILURE); + } + + XC = 0; + YC = 0; + Pass = 0; + OutCount = 0; BitOffset = 0; - DataMask = (1 << ((GifHead->PackedField & 0x07) +1)) -1; - Raster = GifImageDesc->GIFImage; + DataMask = (1 << ((GifHead->PackedField & 0x07) + 1)) - 1; + Raster = GifImageDesc->GIFImage; - /* Check for image seperator */ + /* Check for image separator */ /* Now read in values from the image descriptor */ - IWidth = GifImageDesc->ImageWidth; - IHeight = GifImageDesc->ImageHeight; - Interlace = GifImageDesc->PackedField & 0x40; + IWidth = GifImageDesc->ImageWidth; + IHeight = GifImageDesc->ImageHeight; + Interlace = (uint8_t)(GifImageDesc->PackedField & 0x40); /* * Note that I ignore the possible existence of a local color map. I'm @@ -183,13 +193,13 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) */ /* - * Start reading the raster data. First we get the WORDial code size and + * Start reading the raster data. First we get the initial code size and * compute decompressor constant values, based on this code size. */ - CodeSize = GifImageDesc->CodeSize; + CodeSize = GifImageDesc->CodeSize; ClearCode = (1 << CodeSize); - EOFCode = ClearCode + 1; + EOFCode = ClearCode + 1; FreeCode = FirstFree = ClearCode + 2; /* @@ -201,18 +211,18 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) CodeSize++; InitCodeSize = CodeSize; - MaxCode = (1 << CodeSize); - ReadMask = MaxCode - 1; + MaxCode = (1 << CodeSize); + ReadMask = MaxCode - 1; /* * Read the raster data. Here we just transpose it from the GIF array to - * the Raster array, turning it from a series of blocks WORDo one long + * the Raster array, turning it from a series of blocks into one long * data stream, which makes life much easier for ReadCode(). */ /* Allocate the Image */ - if (!(Image = (BYTE *)malloc((size_t)IWidth*(size_t)IHeight))) { + if (!(Image = (GIFBYTE *)malloc((size_t)IWidth * (size_t)IHeight))) { printf("Out of memory"); exit(EXIT_FAILURE); } @@ -233,13 +243,14 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) */ if (Code == ClearCode) { CodeSize = InitCodeSize; - MaxCode = (1 << CodeSize); + MaxCode = (1 << CodeSize); ReadMask = MaxCode - 1; FreeCode = FirstFree; CurCode = OldCode = Code = ReadCode(); - FinChar = CurCode & DataMask; - AddToPixel((BYTE)FinChar); - } else { + FinChar = CurCode & DataMask; + AddToPixel((GIFBYTE)FinChar); + } + else { /* * If not a clear code, then must be data: save same as CurCode * and InCode @@ -251,12 +262,12 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) * repeat the last character decoded */ if (CurCode >= FreeCode) { - CurCode = OldCode; + CurCode = OldCode; OutCode[OutCount++] = FinChar; } /* - * Unless this code is raw data, pursue the chain poWORDed to by + * Unless this code is raw data, pursue the chain pointed to by * CurCode through the hash table to its end; each code in the * chain puts its associated output code on the output queue. */ @@ -266,11 +277,11 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) } OutCode[OutCount++] = Suffix[CurCode]; - CurCode = Prefix[CurCode]; + CurCode = Prefix[CurCode]; } /* The last code in the chain is treated as raw data. */ - FinChar = CurCode & DataMask; + FinChar = CurCode & DataMask; OutCode[OutCount++] = FinChar; /* @@ -278,7 +289,7 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) * stacked LIFO, so deal with it that way... */ for (i = OutCount - 1; i >= 0; i--) - AddToPixel((BYTE)OutCode[i]); + AddToPixel((GIFBYTE)OutCode[i]); OutCount = 0; @@ -288,10 +299,10 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) */ Prefix[FreeCode] = OldCode; Suffix[FreeCode] = FinChar; - OldCode = InCode; + OldCode = InCode; /* - * PoWORD to the next slot in the table. If we exceed the current + * Point to the next slot in the table. If we exceed the current * MaxCode value, increment the code size unless it's already 12. * If it is, do nothing: the next code decompressed better be * CLEAR @@ -309,5 +320,9 @@ Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead) Code = ReadCode(); } + free(Prefix); + free(Suffix); + free(OutCode); + return Image; } |