--- /dev/null
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/*
+ * This package is based on the work done by Keiron Liddle, Aftex Software
+ * <keiron@aftexsw.com> to whom the Ant project is very grateful for his
+ * great code.
+ */
+package org.apache.tools.bzip2;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * An input stream that decompresses from the BZip2 format (without the file
+ * header chars) to be read as any other stream.
+ *
+ * <p>The decompression requires large amounts of memory. Thus you
+ * should call the {@link #close() close()} method as soon as
+ * possible, to force <tt>CBZip2InputStream</tt> to release the
+ * allocated memory. See {@link CBZip2OutputStream
+ * CBZip2OutputStream} for information about memory usage.</p>
+ *
+ * <p><tt>CBZip2InputStream</tt> reads bytes from the compressed
+ * source stream via the single byte {@link java.io.InputStream#read()
+ * read()} method exclusively. Thus you should consider to use a
+ * buffered source stream.</p>
+ *
+ * <p>Instances of this class are not threadsafe.</p>
+ */
+public class CBZip2InputStream extends InputStream implements BZip2Constants {
+
+ /**
+ * Index of the last char in the block, so the block size == last + 1.
+ */
+ private int last;
+
+ /**
+ * Index in zptr[] of original string after sorting.
+ */
+ private int origPtr;
+
+ /**
+ * always: in the range 0 .. 9.
+ * The current block size is 100000 * this number.
+ */
+ private int blockSize100k;
+
+ private boolean blockRandomised;
+
+ private int bsBuff;
+ private int bsLive;
+ private final CRC crc = new CRC();
+
+ private int nInUse;
+
+ private InputStream in;
+ private final boolean decompressConcatenated;
+
+ private int currentChar = -1;
+
+ private static final int EOF = 0;
+ private static final int START_BLOCK_STATE = 1;
+ private static final int RAND_PART_A_STATE = 2;
+ private static final int RAND_PART_B_STATE = 3;
+ private static final int RAND_PART_C_STATE = 4;
+ private static final int NO_RAND_PART_A_STATE = 5;
+ private static final int NO_RAND_PART_B_STATE = 6;
+ private static final int NO_RAND_PART_C_STATE = 7;
+
+ private int currentState = START_BLOCK_STATE;
+
+ private int storedBlockCRC, storedCombinedCRC;
+ private int computedBlockCRC, computedCombinedCRC;
+
+ // Variables used by setup* methods exclusively
+
+ private int su_count;
+ private int su_ch2;
+ private int su_chPrev;
+ private int su_i2;
+ private int su_j2;
+ private int su_rNToGo;
+ private int su_rTPos;
+ private int su_tPos;
+ private char su_z;
+
+ /**
+ * All memory intensive stuff.
+ * This field is initialized by initBlock().
+ */
+ private CBZip2InputStream.Data data;
+
+ /**
+ * Constructs a new CBZip2InputStream which decompresses bytes read from
+ * the specified stream. This doesn't suppprt decompressing
+ * concatenated .bz2 files.
+ *
+ * <p>Although BZip2 headers are marked with the magic
+ * <tt>"Bz"</tt> this constructor expects the next byte in the
+ * stream to be the first one after the magic. Thus callers have
+ * to skip the first two bytes. Otherwise this constructor will
+ * throw an exception. </p>
+ * @param in
+ *
+ * @throws IOException
+ * if the stream content is malformed or an I/O error occurs.
+ * @throws NullPointerException
+ * if <tt>in == null</tt>
+ */
+ public CBZip2InputStream(final InputStream in) throws IOException {
+ this(in, false);
+ }
+
+ /**
+ * Constructs a new CBZip2InputStream which decompresses bytes
+ * read from the specified stream.
+ *
+ * <p>Although BZip2 headers are marked with the magic
+ * <tt>"Bz"</tt> this constructor expects the next byte in the
+ * stream to be the first one after the magic. Thus callers have
+ * to skip the first two bytes. Otherwise this constructor will
+ * throw an exception. </p>
+ *
+ * @param in the InputStream from which this object should be created
+ * @param decompressConcatenated
+ * if true, decompress until the end of the input;
+ * if false, stop after the first .bz2 stream and
+ * leave the input position to point to the next
+ * byte after the .bz2 stream
+ *
+ * @throws IOException
+ * if the stream content is malformed or an I/O error occurs.
+ * @throws NullPointerException
+ * if <tt>in == null</tt>
+ */
+ public CBZip2InputStream(final InputStream in,
+ final boolean decompressConcatenated)
+ throws IOException {
+ super();
+
+ this.in = in;
+ this.decompressConcatenated = decompressConcatenated;
+
+ init(true);
+ initBlock();
+ setupBlock();
+ }
+
+ /** {@inheritDoc} */
+ @Override
+ public int read() throws IOException {
+ if (this.in == null)
+ throw new IOException("stream closed");
+ return read0();
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see java.io.InputStream#read(byte[], int, int)
+ */
+ @Override
+ public int read(final byte[] dest, final int offs, final int len)
+ throws IOException {
+ if (offs < 0) {
+ throw new IndexOutOfBoundsException("offs(" + offs + ") < 0.");
+ }
+ if (len < 0) {
+ throw new IndexOutOfBoundsException("len(" + len + ") < 0.");
+ }
+ if (offs + len > dest.length) {
+ throw new IndexOutOfBoundsException("offs(" + offs + ") + len("
+ + len + ") > dest.length("
+ + dest.length + ").");
+ }
+ if (this.in == null) {
+ throw new IOException("stream closed");
+ }
+
+ final int hi = offs + len;
+ int destOffs = offs;
+ for (int b; (destOffs < hi) && ((b = read0()) >= 0);) {
+ dest[destOffs++] = (byte) b;
+ }
+
+ return (destOffs == offs) ? -1 : (destOffs - offs);
+ }
+
+ private void makeMaps() {
+ final boolean[] inUse = this.data.inUse;
+ final byte[] seqToUnseq = this.data.seqToUnseq;
+
+ int nInUseShadow = 0;
+
+ for (int i = 0; i < 256; i++) {
+ if (inUse[i]) {
+ seqToUnseq[nInUseShadow++] = (byte) i;
+ }
+ }
+
+ this.nInUse = nInUseShadow;
+ }
+
+ private int read0() throws IOException {
+ final int retChar = this.currentChar;
+
+ switch (this.currentState) {
+ case EOF:
+ return -1;
+
+ case START_BLOCK_STATE:
+ throw new IllegalStateException();
+
+ case RAND_PART_A_STATE:
+ throw new IllegalStateException();
+
+ case RAND_PART_B_STATE:
+ setupRandPartB();
+ break;
+
+ case RAND_PART_C_STATE:
+ setupRandPartC();
+ break;
+
+ case NO_RAND_PART_A_STATE:
+ throw new IllegalStateException();
+
+ case NO_RAND_PART_B_STATE:
+ setupNoRandPartB();
+ break;
+
+ case NO_RAND_PART_C_STATE:
+ setupNoRandPartC();
+ break;
+
+ default:
+ throw new IllegalStateException();
+ }
+
+ return retChar;
+ }
+
+ private boolean init(boolean isFirstStream) throws IOException {
+ if (null == in) {
+ throw new IOException("No InputStream");
+ }
+
+ if (isFirstStream) {
+ if (in.available() == 0) {
+ throw new IOException("Empty InputStream");
+ }
+ } else {
+ int magic0 = read();
+ if (magic0 == -1) {
+ return false;
+ }
+ int magic1 = read();
+ if (magic0 != 'B' || magic1 != 'Z') {
+ throw new IOException("Garbage after a valid BZip2 stream");
+ }
+ }
+
+ int magic2 = read();
+ if (magic2 != 'h') {
+ throw new IOException(isFirstStream
+ ? "Stream is not in the BZip2 format"
+ : "Garbage after a valid BZip2 stream");
+ }
+
+ int blockSize = read();
+ if ((blockSize < '1') || (blockSize > '9')) {
+ throw new IOException("Stream is not BZip2 formatted: illegal "
+ + "blocksize " + (char) blockSize);
+ }
+
+ this.blockSize100k = blockSize - '0';
+
+ this.bsLive = 0;
+ this.computedCombinedCRC = 0;
+
+ return true;
+ }
+
+ private void initBlock() throws IOException {
+ char magic0;
+ char magic1;
+ char magic2;
+ char magic3;
+ char magic4;
+ char magic5;
+
+ while (true) {
+ // Get the block magic bytes.
+ magic0 = bsGetUByte();
+ magic1 = bsGetUByte();
+ magic2 = bsGetUByte();
+ magic3 = bsGetUByte();
+ magic4 = bsGetUByte();
+ magic5 = bsGetUByte();
+
+ // If isn't end of stream magic, break out of the loop.
+ if (magic0 != 0x17 || magic1 != 0x72 || magic2 != 0x45 || magic3 != 0x38
+ || magic4 != 0x50 || magic5 != 0x90) {
+ break;
+ }
+
+ // End of stream was reached. Check the combined CRC and
+ // advance to the next .bz2 stream if decoding concatenated
+ // streams.
+ if (complete()) {
+ return;
+ }
+ }
+
+ if (magic0 != 0x31 || // '1'
+ magic1 != 0x41 || // ')'
+ magic2 != 0x59 || // 'Y'
+ magic3 != 0x26 || // '&'
+ magic4 != 0x53 || // 'S'
+ magic5 != 0x59 // 'Y'
+ ) {
+ this.currentState = EOF;
+ throw new IOException("bad block header");
+ }
+ this.storedBlockCRC = bsGetInt();
+ this.blockRandomised = bsR(1) == 1;
+
+ /**
+ * Allocate data here instead in constructor, so we do not allocate it if
+ * the input file is empty.
+ */
+ if (this.data == null) {
+ this.data = new Data(this.blockSize100k);
+ }
+
+ // currBlockNo++;
+ getAndMoveToFrontDecode();
+
+ this.crc.initialiseCRC();
+ this.currentState = START_BLOCK_STATE;
+ }
+
+ private void endBlock() throws IOException {
+ this.computedBlockCRC = this.crc.getFinalCRC();
+
+ // A bad CRC is considered a fatal error.
+ if (this.storedBlockCRC != this.computedBlockCRC) {
+ // make next blocks readable without error
+ // (repair feature, not yet documented, not tested)
+ this.computedCombinedCRC
+ = (this.storedCombinedCRC << 1)
+ | (this.storedCombinedCRC >>> 31);
+ this.computedCombinedCRC ^= this.storedBlockCRC;
+
+ reportCRCError();
+ }
+
+ this.computedCombinedCRC
+ = (this.computedCombinedCRC << 1)
+ | (this.computedCombinedCRC >>> 31);
+ this.computedCombinedCRC ^= this.computedBlockCRC;
+ }
+
+ private boolean complete() throws IOException {
+ this.storedCombinedCRC = bsGetInt();
+ this.currentState = EOF;
+ this.data = null;
+
+ if (this.storedCombinedCRC != this.computedCombinedCRC) {
+ reportCRCError();
+ }
+
+ // Look for the next .bz2 stream if decompressing
+ // concatenated files.
+ return !decompressConcatenated || !init(false);
+ }
+
+ @Override
+ public void close() throws IOException {
+ InputStream inShadow = this.in;
+ if (inShadow != null) {
+ try {
+ if (inShadow != System.in) {
+ inShadow.close();
+ }
+ } finally {
+ this.data = null;
+ this.in = null;
+ }
+ }
+ }
+
+ private int bsR(final int n) throws IOException {
+ int bsLiveShadow = this.bsLive;
+ int bsBuffShadow = this.bsBuff;
+
+ if (bsLiveShadow < n) {
+ final InputStream inShadow = this.in;
+ do {
+ int thech = read();//inShadow.read();
+
+ if (thech < 0) {
+ throw new IOException("unexpected end of stream");
+ }
+
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ } while (bsLiveShadow < n);
+
+ this.bsBuff = bsBuffShadow;
+ }
+
+ this.bsLive = bsLiveShadow - n;
+ return (bsBuffShadow >> (bsLiveShadow - n)) & ((1 << n) - 1);
+ }
+
+ private boolean bsGetBit() throws IOException {
+ int bsLiveShadow = this.bsLive;
+ int bsBuffShadow = this.bsBuff;
+
+ if (bsLiveShadow < 1) {
+ int thech = read();
+
+ if (thech < 0) {
+ throw new IOException("unexpected end of stream");
+ }
+
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ this.bsBuff = bsBuffShadow;
+ }
+
+ this.bsLive = bsLiveShadow - 1;
+ return ((bsBuffShadow >> (bsLiveShadow - 1)) & 1) != 0;
+ }
+
+ private char bsGetUByte() throws IOException {
+ return (char) bsR(8);
+ }
+
+ private int bsGetInt() throws IOException {
+ return (((((bsR(8) << 8) | bsR(8)) << 8) | bsR(8)) << 8) | bsR(8);
+ }
+
+ /**
+ * Called by createHuffmanDecodingTables() exclusively.
+ * @param limit
+ * @param base
+ * @param perm
+ * @param length
+ * @param minLen
+ * @param maxLen
+ * @param alphaSize
+ */
+ private static void hbCreateDecodeTables(final int[] limit,
+ final int[] base,
+ final int[] perm,
+ final char[] length,
+ final int minLen,
+ final int maxLen,
+ final int alphaSize) {
+ for (int i = minLen, pp = 0; i <= maxLen; i++) {
+ for (int j = 0; j < alphaSize; j++) {
+ if (length[j] == i) {
+ perm[pp++] = j;
+ }
+ }
+ }
+
+ for (int i = MAX_CODE_LEN; --i > 0;) {
+ base[i] = 0;
+ limit[i] = 0;
+ }
+
+ for (int i = 0; i < alphaSize; i++) {
+ base[length[i] + 1]++;
+ }
+
+ for (int i = 1, b = base[0]; i < MAX_CODE_LEN; i++) {
+ b += base[i];
+ base[i] = b;
+ }
+
+ for (int i = minLen, vec = 0, b = base[i]; i <= maxLen; i++) {
+ final int nb = base[i + 1];
+ vec += nb - b;
+ b = nb;
+ limit[i] = vec - 1;
+ vec <<= 1;
+ }
+
+ for (int i = minLen + 1; i <= maxLen; i++) {
+ base[i] = ((limit[i - 1] + 1) << 1) - base[i];
+ }
+ }
+
+ private void recvDecodingTables() throws IOException {
+ final Data dataShadow = this.data;
+ final boolean[] inUse = dataShadow.inUse;
+ final byte[] pos = dataShadow.recvDecodingTables_pos;
+ final byte[] selector = dataShadow.selector;
+ final byte[] selectorMtf = dataShadow.selectorMtf;
+
+ int inUse16 = 0;
+
+ /* Receive the mapping table */
+ for (int i = 0; i < 16; i++) {
+ if (bsGetBit()) {
+ inUse16 |= 1 << i;
+ }
+ }
+
+ for (int i = 256; --i >= 0;) {
+ inUse[i] = false;
+ }
+
+ for (int i = 0; i < 16; i++) {
+ if ((inUse16 & (1 << i)) != 0) {
+ final int i16 = i << 4;
+ for (int j = 0; j < 16; j++) {
+ if (bsGetBit()) {
+ inUse[i16 + j] = true;
+ }
+ }
+ }
+ }
+
+ makeMaps();
+ final int alphaSize = this.nInUse + 2;
+
+ /* Now the selectors */
+ final int nGroups = bsR(3);
+ final int nSelectors = bsR(15);
+
+ for (int i = 0; i < nSelectors; i++) {
+ int j = 0;
+ while (bsGetBit()) {
+ j++;
+ }
+ selectorMtf[i] = (byte) j;
+ }
+
+ /* Undo the MTF values for the selectors. */
+ for (int v = nGroups; --v >= 0;) {
+ pos[v] = (byte) v;
+ }
+
+ for (int i = 0; i < nSelectors; i++) {
+ int v = selectorMtf[i] & 0xff;
+ final byte tmp = pos[v];
+ while (v > 0) {
+ // nearly all times v is zero, 4 in most other cases
+ pos[v] = pos[v - 1];
+ v--;
+ }
+ pos[0] = tmp;
+ selector[i] = tmp;
+ }
+
+ final char[][] len = dataShadow.temp_charArray2d;
+
+ /* Now the coding tables */
+ for (int t = 0; t < nGroups; t++) {
+ int curr = bsR(5);
+ final char[] len_t = len[t];
+ for (int i = 0; i < alphaSize; i++) {
+ while (bsGetBit()) {
+ curr += bsGetBit() ? -1 : 1;
+ }
+ len_t[i] = (char) curr;
+ }
+ }
+
+ // finally create the Huffman tables
+ createHuffmanDecodingTables(alphaSize, nGroups);
+ }
+
+ /**
+ * Called by recvDecodingTables() exclusively.
+ * @param alphaSize
+ * @param nGroups
+ */
+ private void createHuffmanDecodingTables(final int alphaSize,
+ final int nGroups) {
+ final Data dataShadow = this.data;
+ final char[][] len = dataShadow.temp_charArray2d;
+ final int[] minLens = dataShadow.minLens;
+ final int[][] limit = dataShadow.limit;
+ final int[][] base = dataShadow.base;
+ final int[][] perm = dataShadow.perm;
+
+ for (int t = 0; t < nGroups; t++) {
+ int minLen = 32;
+ int maxLen = 0;
+ final char[] len_t = len[t];
+ for (int i = alphaSize; --i >= 0;) {
+ final char lent = len_t[i];
+ if (lent > maxLen) {
+ maxLen = lent;
+ }
+ if (lent < minLen) {
+ minLen = lent;
+ }
+ }
+ hbCreateDecodeTables(limit[t], base[t], perm[t], len[t], minLen,
+ maxLen, alphaSize);
+ minLens[t] = minLen;
+ }
+ }
+
+ private void getAndMoveToFrontDecode() throws IOException {
+ this.origPtr = bsR(24);
+ recvDecodingTables();
+
+ final InputStream inShadow = this.in;
+ final Data dataShadow = this.data;
+ final byte[] ll8 = dataShadow.ll8;
+ final int[] unzftab = dataShadow.unzftab;
+ final byte[] selector = dataShadow.selector;
+ final byte[] seqToUnseq = dataShadow.seqToUnseq;
+ final char[] yy = dataShadow.getAndMoveToFrontDecode_yy;
+ final int[] minLens = dataShadow.minLens;
+ final int[][] limit = dataShadow.limit;
+ final int[][] base = dataShadow.base;
+ final int[][] perm = dataShadow.perm;
+ final int limitLast = this.blockSize100k * 100000;
+
+ /*
+ Setting up the unzftab entries here is not strictly
+ necessary, but it does save having to do it later
+ in a separate pass, and so saves a block's worth of
+ cache misses.
+ */
+ for (int i = 256; --i >= 0;) {
+ yy[i] = (char) i;
+ unzftab[i] = 0;
+ }
+
+ int groupNo = 0;
+ int groupPos = G_SIZE - 1;
+ final int eob = this.nInUse + 1;
+ int nextSym = getAndMoveToFrontDecode0(0);
+ int bsBuffShadow = this.bsBuff;
+ int bsLiveShadow = this.bsLive;
+ int lastShadow = -1;
+ int zt = selector[groupNo] & 0xff;
+ int[] base_zt = base[zt];
+ int[] limit_zt = limit[zt];
+ int[] perm_zt = perm[zt];
+ int minLens_zt = minLens[zt];
+
+ while (nextSym != eob) {
+ if ((nextSym == RUNA) || (nextSym == RUNB)) {
+ int s = -1;
+
+ for (int n = 1; true; n <<= 1) {
+ if (nextSym == RUNA) {
+ s += n;
+ } else if (nextSym == RUNB) {
+ s += n << 1;
+ } else {
+ break;
+ }
+
+ if (groupPos == 0) {
+ groupPos = G_SIZE - 1;
+ zt = selector[++groupNo] & 0xff;
+ base_zt = base[zt];
+ limit_zt = limit[zt];
+ perm_zt = perm[zt];
+ minLens_zt = minLens[zt];
+ } else {
+ groupPos--;
+ }
+
+ int zn = minLens_zt;
+
+ // Inlined:
+ // int zvec = bsR(zn);
+ while (bsLiveShadow < zn) {
+ final int thech = read();//inShadow.read();
+ if (thech < 0)
+ throw new IOException("unexpected end of stream");
+
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ continue;
+ }
+ int zvec = (bsBuffShadow >> (bsLiveShadow - zn)) & ((1 << zn) - 1);
+ bsLiveShadow -= zn;
+
+ while (zvec > limit_zt[zn]) {
+ zn++;
+ while (bsLiveShadow < 1) {
+ final int thech = read();//inShadow.read();
+ if (thech < 0)
+ throw new IOException("unexpected end of stream");
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ continue;
+ }
+ bsLiveShadow--;
+ zvec = (zvec << 1) | ((bsBuffShadow >> bsLiveShadow) & 1);
+ }
+ nextSym = perm_zt[zvec - base_zt[zn]];
+ }
+
+ final byte ch = seqToUnseq[yy[0]];
+ unzftab[ch & 0xff] += s + 1;
+
+ while (s-- >= 0) {
+ ll8[++lastShadow] = ch;
+ }
+
+ if (lastShadow >= limitLast) {
+ throw new IOException("block overrun");
+ }
+ } else {
+ if (++lastShadow >= limitLast) {
+ throw new IOException("block overrun");
+ }
+
+ final char tmp = yy[nextSym - 1];
+ unzftab[seqToUnseq[tmp] & 0xff]++;
+ ll8[lastShadow] = seqToUnseq[tmp];
+
+ /*
+ This loop is hammered during decompression,
+ hence avoid native method call overhead of
+ System.arraycopy for very small ranges to copy.
+ */
+ if (nextSym <= 16) {
+ for (int j = nextSym - 1; j > 0;) {
+ yy[j] = yy[--j];
+ }
+ } else {
+ System.arraycopy(yy, 0, yy, 1, nextSym - 1);
+ }
+
+ yy[0] = tmp;
+
+ if (groupPos == 0) {
+ groupPos = G_SIZE - 1;
+ zt = selector[++groupNo] & 0xff;
+ base_zt = base[zt];
+ limit_zt = limit[zt];
+ perm_zt = perm[zt];
+ minLens_zt = minLens[zt];
+ } else {
+ groupPos--;
+ }
+
+ int zn = minLens_zt;
+
+ // Inlined:
+ // int zvec = bsR(zn);
+ while (bsLiveShadow < zn) {
+ final int thech = read();//inShadow.read();
+ if (thech < 0)
+ throw new IOException("unexpected end of stream");
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ continue;
+ }
+ int zvec = (bsBuffShadow >> (bsLiveShadow - zn)) & ((1 << zn) - 1);
+ bsLiveShadow -= zn;
+
+ while (zvec > limit_zt[zn]) {
+ zn++;
+ while (bsLiveShadow < 1) {
+ final int thech = read();//inShadow.read();
+ if (thech <0)
+ throw new IOException("unexpected end of stream");
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ continue;
+ }
+ bsLiveShadow--;
+ zvec = (zvec << 1) | ((bsBuffShadow >> bsLiveShadow) & 1);
+ }
+ nextSym = perm_zt[zvec - base_zt[zn]];
+ }
+ }
+
+ this.last = lastShadow;
+ this.bsLive = bsLiveShadow;
+ this.bsBuff = bsBuffShadow;
+ }
+
+ private int getAndMoveToFrontDecode0(final int groupNo) throws IOException {
+ final InputStream inShadow = this.in;
+ final Data dataShadow = this.data;
+ final int zt = dataShadow.selector[groupNo] & 0xff;
+ final int[] limit_zt = dataShadow.limit[zt];
+ int zn = dataShadow.minLens[zt];
+ int zvec = bsR(zn);
+ int bsLiveShadow = this.bsLive;
+ int bsBuffShadow = this.bsBuff;
+
+ while (zvec > limit_zt[zn]) {
+ zn++;
+ while (bsLiveShadow < 1) {
+ final int thech = read();//inShadow.read();
+
+ if (thech < 0)
+ throw new IOException("unexpected end of stream");
+
+ bsBuffShadow = (bsBuffShadow << 8) | thech;
+ bsLiveShadow += 8;
+ continue;
+ }
+ bsLiveShadow--;
+ zvec = (zvec << 1) | ((bsBuffShadow >> bsLiveShadow) & 1);
+ }
+
+ this.bsLive = bsLiveShadow;
+ this.bsBuff = bsBuffShadow;
+
+ return dataShadow.perm[zt][zvec - dataShadow.base[zt][zn]];
+ }
+
+ private void setupBlock() throws IOException {
+ if (this.data == null) {
+ return;
+ }
+
+ final int[] cftab = this.data.cftab;
+ final int[] tt = this.data.initTT(this.last + 1);
+ final byte[] ll8 = this.data.ll8;
+ cftab[0] = 0;
+ System.arraycopy(this.data.unzftab, 0, cftab, 1, 256);
+
+ for (int i = 1, c = cftab[0]; i <= 256; i++) {
+ c += cftab[i];
+ cftab[i] = c;
+ }
+
+ for (int i = 0, lastShadow = this.last; i <= lastShadow; i++) {
+ tt[cftab[ll8[i] & 0xff]++] = i;
+ }
+
+ if ((this.origPtr < 0) || (this.origPtr >= tt.length)) {
+ throw new IOException("stream corrupted");
+ }
+
+ this.su_tPos = tt[this.origPtr];
+ this.su_count = 0;
+ this.su_i2 = 0;
+ this.su_ch2 = 256; /* not a char and not EOF */
+
+ if (this.blockRandomised) {
+ this.su_rNToGo = 0;
+ this.su_rTPos = 0;
+ setupRandPartA();
+ } else {
+ setupNoRandPartA();
+ }
+ }
+
+ private void setupRandPartA() throws IOException {
+ if (this.su_i2 <= this.last) {
+ this.su_chPrev = this.su_ch2;
+ int su_ch2Shadow = this.data.ll8[this.su_tPos] & 0xff;
+ this.su_tPos = this.data.tt[this.su_tPos];
+ if (this.su_rNToGo == 0) {
+ this.su_rNToGo = BZip2Constants.rNums[this.su_rTPos] - 1;
+ if (++this.su_rTPos == 512) {
+ this.su_rTPos = 0;
+ }
+ } else {
+ this.su_rNToGo--;
+ }
+ this.su_ch2 = su_ch2Shadow ^= (this.su_rNToGo == 1) ? 1 : 0;
+ this.su_i2++;
+ this.currentChar = su_ch2Shadow;
+ this.currentState = RAND_PART_B_STATE;
+ this.crc.updateCRC(su_ch2Shadow);
+ } else {
+ endBlock();
+ initBlock();
+ setupBlock();
+ }
+ }
+
+ private void setupNoRandPartA() throws IOException {
+ if (this.su_i2 <= this.last) {
+ this.su_chPrev = this.su_ch2;
+ int su_ch2Shadow = this.data.ll8[this.su_tPos] & 0xff;
+ this.su_ch2 = su_ch2Shadow;
+ this.su_tPos = this.data.tt[this.su_tPos];
+ this.su_i2++;
+ this.currentChar = su_ch2Shadow;
+ this.currentState = NO_RAND_PART_B_STATE;
+ this.crc.updateCRC(su_ch2Shadow);
+ } else {
+ this.currentState = NO_RAND_PART_A_STATE;
+ endBlock();
+ initBlock();
+ setupBlock();
+ }
+ }
+
+ private void setupRandPartB() throws IOException {
+ if (this.su_ch2 != this.su_chPrev) {
+ this.currentState = RAND_PART_A_STATE;
+ this.su_count = 1;
+ setupRandPartA();
+ } else if (++this.su_count >= 4) {
+ this.su_z = (char) (this.data.ll8[this.su_tPos] & 0xff);
+ this.su_tPos = this.data.tt[this.su_tPos];
+ if (this.su_rNToGo == 0) {
+ this.su_rNToGo = BZip2Constants.rNums[this.su_rTPos] - 1;
+ if (++this.su_rTPos == 512) {
+ this.su_rTPos = 0;
+ }
+ } else {
+ this.su_rNToGo--;
+ }
+ this.su_j2 = 0;
+ this.currentState = RAND_PART_C_STATE;
+ if (this.su_rNToGo == 1) {
+ this.su_z ^= 1;
+ }
+ setupRandPartC();
+ } else {
+ this.currentState = RAND_PART_A_STATE;
+ setupRandPartA();
+ }
+ }
+
+ private void setupRandPartC() throws IOException {
+ if (this.su_j2 < this.su_z) {
+ this.currentChar = this.su_ch2;
+ this.crc.updateCRC(this.su_ch2);
+ this.su_j2++;
+ } else {
+ this.currentState = RAND_PART_A_STATE;
+ this.su_i2++;
+ this.su_count = 0;
+ setupRandPartA();
+ }
+ }
+
+ private void setupNoRandPartB() throws IOException {
+ if (this.su_ch2 != this.su_chPrev) {
+ this.su_count = 1;
+ setupNoRandPartA();
+ } else if (++this.su_count >= 4) {
+ this.su_z = (char) (this.data.ll8[this.su_tPos] & 0xff);
+ this.su_tPos = this.data.tt[this.su_tPos];
+ this.su_j2 = 0;
+ setupNoRandPartC();
+ } else {
+ setupNoRandPartA();
+ }
+ }
+
+ private void setupNoRandPartC() throws IOException {
+ if (this.su_j2 < this.su_z) {
+ int su_ch2Shadow = this.su_ch2;
+ this.currentChar = su_ch2Shadow;
+ this.crc.updateCRC(su_ch2Shadow);
+ this.su_j2++;
+ this.currentState = NO_RAND_PART_C_STATE;
+ } else {
+ this.su_i2++;
+ this.su_count = 0;
+ setupNoRandPartA();
+ }
+ }
+
+ private static final class Data extends Object {
+
+ // (with blockSize 900k)
+ final boolean[] inUse = new boolean[256]; // 256 byte
+
+ final byte[] seqToUnseq = new byte[256]; // 256 byte
+ final byte[] selector = new byte[MAX_SELECTORS]; // 18002 byte
+ final byte[] selectorMtf = new byte[MAX_SELECTORS]; // 18002 byte
+
+ /**
+ * Freq table collected to save a pass over the data during
+ * decompression.
+ */
+ final int[] unzftab = new int[256]; // 1024 byte
+
+ final int[][] limit = new int[N_GROUPS][MAX_ALPHA_SIZE]; // 6192 byte
+ final int[][] base = new int[N_GROUPS][MAX_ALPHA_SIZE]; // 6192 byte
+ final int[][] perm = new int[N_GROUPS][MAX_ALPHA_SIZE]; // 6192 byte
+ final int[] minLens = new int[N_GROUPS]; // 24 byte
+
+ final int[] cftab = new int[257]; // 1028 byte
+ final char[] getAndMoveToFrontDecode_yy = new char[256]; // 512 byte
+ final char[][] temp_charArray2d = new char[N_GROUPS][MAX_ALPHA_SIZE]; // 3096 byte
+ final byte[] recvDecodingTables_pos = new byte[N_GROUPS]; // 6 byte
+ //---------------
+ // 60798 byte
+
+ int[] tt; // 3600000 byte
+ byte[] ll8; // 900000 byte
+ //---------------
+ // 4560782 byte
+ //===============
+
+ Data(int blockSize100k) {
+ super();
+
+ this.ll8 = new byte[blockSize100k * BZip2Constants.baseBlockSize];
+ }
+
+ /**
+ * Initializes the {@link #tt} array.
+ *
+ * This method is called when the required length of the array
+ * is known. I don't initialize it at construction time to
+ * avoid unnecessary memory allocation when compressing small
+ * files.
+ * @param length
+ * @return int array
+ */
+ final int[] initTT(int length) {
+ int[] ttShadow = this.tt;
+
+ // tt.length should always be >= length, but theoretically
+ // it can happen, if the compressor mixed small and large
+ // blocks. Normally only the last block will be smaller
+ // than others.
+ if ((ttShadow == null) || (ttShadow.length < length)) {
+ this.tt = ttShadow = new int[length];
+ }
+
+ return ttShadow;
+ }
+
+ }
+
+ @SuppressWarnings("unused")
+ private static void reportCRCError() throws IOException {
+ // The clean way would be to throw an exception.
+ //throw new IOException("crc error");
+
+ // Just print a message, like the previous versions of this class did
+ System.err.println("BZip2 CRC error");
+ }
+
+}
+
git://source.jalview.org / jalview.git / blobdiff