1 /*
2 * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
333 int code = (next32Bits >> bitPos) & codeMask;
334 bitPos += codeSize;
335
336 // Shift in a byte of new data at a time
337 while (bitPos >= 8 && !lastBlockFound) {
338 next32Bits >>>= 8;
339 bitPos -= 8;
340
341 // Check if current block is out of bytes
342 if (nextByte >= blockLength) {
343 // Get next block size
344 blockLength = stream.readUnsignedByte();
345 if (blockLength == 0) {
346 lastBlockFound = true;
347 return code;
348 } else {
349 int left = blockLength;
350 int off = 0;
351 while (left > 0) {
352 int nbytes = stream.read(block, off, left);
353 off += nbytes;
354 left -= nbytes;
355 }
356 nextByte = 0;
357 }
358 }
359
360 next32Bits |= block[nextByte++] << 24;
361 }
362
363 return code;
364 }
365
366 public void initializeStringTable(int[] prefix,
367 byte[] suffix,
368 byte[] initial,
369 int[] length) {
370 int numEntries = 1 << initCodeSize;
371 for (int i = 0; i < numEntries; i++) {
372 prefix[i] = -1;
913 return theImage;
914 }
915 startPass(0);
916
917 this.rowBuf = new byte[width];
918
919 try {
920 // Read and decode the image data, fill in theImage
921 this.initCodeSize = stream.readUnsignedByte();
922 // GIF allows max 8 bpp, so anything larger is bogus for the roots.
923 if (this.initCodeSize < 1 || this.initCodeSize > 8) {
924 throw new IIOException("Bad code size:" + this.initCodeSize);
925 }
926
927 // Read first data block
928 this.blockLength = stream.readUnsignedByte();
929 int left = blockLength;
930 int off = 0;
931 while (left > 0) {
932 int nbytes = stream.read(block, off, left);
933 left -= nbytes;
934 off += nbytes;
935 }
936
937 this.bitPos = 0;
938 this.nextByte = 0;
939 this.lastBlockFound = false;
940 this.interlacePass = 0;
941
942 // Init 32-bit buffer
943 initNext32Bits();
944
945 this.clearCode = 1 << initCodeSize;
946 this.eofCode = clearCode + 1;
947
948 int code, oldCode = 0;
949
950 int[] prefix = new int[4096];
951 byte[] suffix = new byte[4096];
952 byte[] initial = new byte[4096];
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1 /*
2 * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
333 int code = (next32Bits >> bitPos) & codeMask;
334 bitPos += codeSize;
335
336 // Shift in a byte of new data at a time
337 while (bitPos >= 8 && !lastBlockFound) {
338 next32Bits >>>= 8;
339 bitPos -= 8;
340
341 // Check if current block is out of bytes
342 if (nextByte >= blockLength) {
343 // Get next block size
344 blockLength = stream.readUnsignedByte();
345 if (blockLength == 0) {
346 lastBlockFound = true;
347 return code;
348 } else {
349 int left = blockLength;
350 int off = 0;
351 while (left > 0) {
352 int nbytes = stream.read(block, off, left);
353 if (nbytes == -1 && left > 0) {
354 throw new IIOException("Invalid block length for " +
355 "LZW encoded image data");
356 }
357 off += nbytes;
358 left -= nbytes;
359 }
360 nextByte = 0;
361 }
362 }
363
364 next32Bits |= block[nextByte++] << 24;
365 }
366
367 return code;
368 }
369
370 public void initializeStringTable(int[] prefix,
371 byte[] suffix,
372 byte[] initial,
373 int[] length) {
374 int numEntries = 1 << initCodeSize;
375 for (int i = 0; i < numEntries; i++) {
376 prefix[i] = -1;
917 return theImage;
918 }
919 startPass(0);
920
921 this.rowBuf = new byte[width];
922
923 try {
924 // Read and decode the image data, fill in theImage
925 this.initCodeSize = stream.readUnsignedByte();
926 // GIF allows max 8 bpp, so anything larger is bogus for the roots.
927 if (this.initCodeSize < 1 || this.initCodeSize > 8) {
928 throw new IIOException("Bad code size:" + this.initCodeSize);
929 }
930
931 // Read first data block
932 this.blockLength = stream.readUnsignedByte();
933 int left = blockLength;
934 int off = 0;
935 while (left > 0) {
936 int nbytes = stream.read(block, off, left);
937 if (nbytes == -1 && left > 0) {
938 throw new IIOException("Invalid block length for " +
939 "LZW encoded image data");
940 }
941 left -= nbytes;
942 off += nbytes;
943 }
944
945 this.bitPos = 0;
946 this.nextByte = 0;
947 this.lastBlockFound = false;
948 this.interlacePass = 0;
949
950 // Init 32-bit buffer
951 initNext32Bits();
952
953 this.clearCode = 1 << initCodeSize;
954 this.eofCode = clearCode + 1;
955
956 int code, oldCode = 0;
957
958 int[] prefix = new int[4096];
959 byte[] suffix = new byte[4096];
960 byte[] initial = new byte[4096];
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