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authorJames Laird <jlaird@hdfgroup.org>2006-03-03 21:49:10 (GMT)
committerJames Laird <jlaird@hdfgroup.org>2006-03-03 21:49:10 (GMT)
commitea9f792cd794024f766fc844b49f9eda73e9bc14 (patch)
treea6f32669a2272b7f87e5af94aceebef50639f9e5 /tools/gifconv/decompress.c
parent142705d983f9ac719ad7e64fa66b4f0aa25fad70 (diff)
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[svn-r12001] Purpose:
Moved gif2h5 tool to hl directory Description: Added a tools directory under the hl directory and moved the gif2h5 tool to that directory. Solution: The gif2h5 tool was originally built in the tools directory, but this introduced dependency issues that required special checks in the Makefiles.am and required the top-level build order to be changed because it depended on the HL library. For simplicity in the Makefiles now and in the future, the gif2h5 tool was moved to be underneath the hl library. Platforms tested: mir, copper, modi4, shanti
Diffstat (limited to 'tools/gifconv/decompress.c')
-rw-r--r--tools/gifconv/decompress.c320
1 files changed, 0 insertions, 320 deletions
diff --git a/tools/gifconv/decompress.c b/tools/gifconv/decompress.c
deleted file mode 100644
index 2ebf28d..0000000
--- a/tools/gifconv/decompress.c
+++ /dev/null
@@ -1,320 +0,0 @@
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright by the Board of Trustees of the University of Illinois. *
- * All rights reserved. *
- * *
- * This file is part of HDF5. The full HDF5 copyright notice, including *
- * terms governing use, modification, and redistribution, is contained in *
- * the files COPYING and Copyright.html. COPYING can be found at the root *
- * of the source code distribution tree; Copyright.html can be found at the *
- * root level of an installed copy of the electronic HDF5 document set and *
- * is linked from the top-level documents page. It can also be found at *
- * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
- * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "gif.h"
-
-#define NEXTBYTE (*ptr++)
-
-#define IMAGESEP 0x2c
-#define INTERLACEMASK 0x40
-#define COLORMAPMASK 0x80
-
-WORD 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 */
-
-/*MODIFICATIONS*/
-BYTE tempbyte[10];
-BYTE * tempBYTEptr[10];
-WORD tempint[10];
-WORD 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 */
-
-/* The hash table used by the decompressor */
-
-int Prefix[4096];
-int Suffix[4096];
-
-/* An output array used by the decompressor */
-
-int OutCode[1025];
-
-/* The color map, read from the GIF header */
-
-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
- * code to the bottom, then mask it off and return it.
- */
-static int
-ReadCode(void)
-{
- int RawCode, ByteOffset;
-
- ByteOffset = BitOffset / 8;
- RawCode = Raster[ByteOffset] + (0x100 * Raster[ByteOffset + 1]);
-
- if (CodeSize >= 8)
- RawCode += (0x10000 * Raster[ByteOffset + 2]);
-
- RawCode >>= (BitOffset % 8);
- BitOffset += CodeSize;
- return (RawCode & ReadMask);
-}
-
-static void
-AddToPixel(BYTE 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
- * in the GIF spec. Put the decoded scan line out to the screen if we
- * haven't gone past the bottom of it.
- */
- XC = 0;
-
- if (!Interlace) {
- YC++;
- } 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;
- }
- }
- }
-}
-
-/* Main routine. Convert a GIF image to an HDF image */
-
-BYTE *
-Decompress(GIFIMAGEDESC *GifImageDesc, GIFHEAD *GifHead)
-{
- int i;
-
- XC = 0;
- YC = 0;
- Pass = 0;
- OutCount = 0;
- BitOffset = 0;
-
- DataMask = (1 << ((GifHead->PackedField & 0x07) +1)) -1;
- Raster = GifImageDesc->GIFImage;
-
- /* Check for image seperator */
-
- /* Now read in values from the image descriptor */
- IWidth = GifImageDesc->ImageWidth;
- IHeight = GifImageDesc->ImageHeight;
- Interlace = GifImageDesc->PackedField & 0x40;
-
- /*
- * Note that I ignore the possible existence of a local color map. I'm
- * told there aren't many files around that use them, and the spec says
- * it's defined for future use. This could lead to an error reading some
- * files.
- */
-
- /*
- * Start reading the raster data. First we get the WORDial code size and
- * compute decompressor constant values, based on this code size.
- */
-
- CodeSize = GifImageDesc->CodeSize;
- ClearCode = (1 << CodeSize);
- EOFCode = ClearCode + 1;
- FreeCode = FirstFree = ClearCode + 2;
-
- /*
- * The GIF spec has it that the code size is the code size used to compute
- * the above values is the code size given in the file, but the code size
- * used in compression/decompression is the code size given in the file
- * plus one. (thus the ++).
- */
-
- CodeSize++;
- InitCodeSize = CodeSize;
- 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
- * data stream, which makes life much easier for ReadCode().
- */
-
- /* Allocate the Image */
-
- if (!(Image = (BYTE *)malloc((size_t)IWidth*(size_t)IHeight))) {
- printf("Out of memory");
- exit(-1);
- }
-
- BytesPerScanline = IWidth;
-
- /*
- * Decompress the file, continuing until you see the GIF EOF code. One
- * obvious enhancement is to add checking for corrupt files here.
- */
-
- Code = ReadCode();
-
- while (Code != EOFCode) {
- /*
- * Clear code sets everything back to its initial value, then reads
- * the immediately subsequent code as uncompressed data.
- */
- if (Code == ClearCode) {
- CodeSize = InitCodeSize;
- MaxCode = (1 << CodeSize);
- ReadMask = MaxCode - 1;
- FreeCode = FirstFree;
- CurCode = OldCode = Code = ReadCode();
- FinChar = CurCode & DataMask;
- AddToPixel((BYTE)FinChar);
- } else {
- /*
- * If not a clear code, then must be data: save same as CurCode
- * and InCode
- */
- CurCode = InCode = Code;
-
- /*
- * If greater or equal to FreeCode, not in the hash table yet;
- * repeat the last character decoded
- */
- if (CurCode >= FreeCode) {
- CurCode = OldCode;
- OutCode[OutCount++] = FinChar;
- }
-
- /*
- * Unless this code is raw data, pursue the chain poWORDed to by
- * CurCode through the hash table to its end; each code in the
- * chain puts its associated output code on the output queue.
- */
- while (CurCode > DataMask) {
- if (OutCount > 1024) {
- /*return error message*/
- }
-
- OutCode[OutCount++] = Suffix[CurCode];
- CurCode = Prefix[CurCode];
- }
-
- /* The last code in the chain is treated as raw data. */
- FinChar = CurCode & DataMask;
- OutCode[OutCount++] = FinChar;
-
- /*
- * Now we put the data out to the Output routine. It's been
- * stacked LIFO, so deal with it that way...
- */
- for (i = OutCount - 1; i >= 0; i--)
- AddToPixel((BYTE)OutCode[i]);
-
- OutCount = 0;
-
- /*
- * Build the hash table on-the-fly. No table is stored in the
- * file.
- */
- Prefix[FreeCode] = OldCode;
- Suffix[FreeCode] = FinChar;
- OldCode = InCode;
-
- /*
- * PoWORD 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
- */
- FreeCode++;
-
- if (FreeCode >= MaxCode)
- if (CodeSize < 12) {
- CodeSize++;
- MaxCode *= 2;
- ReadMask = (1 << CodeSize) - 1;
- }
- }
-
- Code = ReadCode();
- }
-
- return Image;
-}