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978 lines
27 KiB
C#
978 lines
27 KiB
C#
// Originally copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
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// All rights reserved.
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// See license.txt, section Ionic.Zlib license
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#if __MonoCS__
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using System;
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using System.IO;
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namespace Ionic.Zlib
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{
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sealed class InflateBlocks
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{
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const int MANY = 1440;
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// Table for deflate from PKZIP's appnote.txt.
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static readonly int[] border = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 };
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enum InflateBlockMode {
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TYPE = 0, // get type bits (3, including end bit)
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LENS = 1, // get lengths for stored
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STORED = 2, // processing stored block
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TABLE = 3, // get table lengths
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BTREE = 4, // get bit lengths tree for a dynamic block
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DTREE = 5, // get length, distance trees for a dynamic block
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CODES = 6, // processing fixed or dynamic block
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DRY = 7, // output remaining window bytes
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DONE = 8, // finished last block, done
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}
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InflateBlockMode mode; // current inflate_block mode
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int left; // if STORED, bytes left to copy
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int table; // table lengths (14 bits)
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int index; // index into blens (or border)
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int[] blens; // bit lengths of codes
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int bb; // bit length tree depth
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int tb; // bit length decoding tree
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InflateCodes codes = new InflateCodes(); // if CODES, current state
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int last; // true if this block is the last block
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internal ZlibCodec codec; // pointer back to this zlib stream
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// mode independent information
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internal int bitk; // bits in bit buffer
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internal int bitb; // bit buffer
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internal int[] hufts; // single malloc for tree space
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internal byte[] window; // sliding window
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internal int end; // one byte after sliding window
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internal int readAt; // window read pointer
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internal int writeAt; // window write pointer
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InfTree inftree = new InfTree();
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internal InflateBlocks(ZlibCodec codec, int w) {
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this.codec = codec;
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hufts = new int[MANY * 3];
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window = new byte[w];
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end = w;
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mode = InflateBlockMode.TYPE;
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Reset();
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}
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internal void Reset() {
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mode = InflateBlockMode.TYPE;
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bitk = 0;
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bitb = 0;
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readAt = writeAt = 0;
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}
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internal int Process(int r) {
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int t; // temporary storage
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int nextIn = codec.NextIn; // input data pointer
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int availIn = codec.AvailableBytesIn; // bytes available there
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int bits = bitb; // bit buffer
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int bitsNum = bitk; // bits in bit buffer
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int q = writeAt; // output window write pointer
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int m = q < readAt ? readAt - q - 1 : end - q; // bytes to end of window or read pointer
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// process input based on current state
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while (true)
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{
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switch (mode)
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{
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case InflateBlockMode.TYPE:
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while (bitsNum < 3) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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last = bits & 0x1;
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switch ((bits & 0x7) >> 1) {
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case 0: // stored
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bits >>= 3; bitsNum -= 3;
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t = bitsNum & 7; // go to byte boundary
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bits >>= t; bitsNum -= t;
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mode = InflateBlockMode.LENS; // get length of stored block
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break;
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case 1: // fixed
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int bl, bd;
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int[] tl, td;
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InfTree.InflateTreesFixed(out bl, out bd, out tl, out td);
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codes.Init(bl, bd, tl, 0, td, 0);
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bits >>= 3; bitsNum -= 3;
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mode = InflateBlockMode.CODES;
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break;
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case 2: // dynamic
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bits >>= 3; bitsNum -= 3;
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mode = InflateBlockMode.TABLE;
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break;
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case 3: // illegal
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throw new InvalidDataException("invalid block type");
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} break;
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case InflateBlockMode.LENS:
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while (bitsNum < 32) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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if (((~bits >> 16) & 0xffff) != (bits & 0xffff)) {
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throw new InvalidDataException("invalid stored block lengths");
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}
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left = bits & 0xffff;
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bits = bitsNum = 0; // dump bits
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mode = left != 0 ? InflateBlockMode.STORED : (last != 0 ? InflateBlockMode.DRY : InflateBlockMode.TYPE);
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break;
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case InflateBlockMode.STORED:
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if (availIn == 0) {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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if (m == 0) {
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if (q == end && readAt != 0) {
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q = 0;
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m = q < readAt ? readAt - q - 1 : end - q;
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}
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if (m == 0) {
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writeAt = q;
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r = Flush(r);
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q = writeAt;
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m = q < readAt ? readAt - q - 1 : end - q;
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if (q == end && readAt != 0) {
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q = 0;
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m = q < readAt ? readAt - q - 1 : end - q;
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}
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if (m == 0) {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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}
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}
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r = RCode.Okay;
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t = left;
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if (t > availIn)
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t = availIn;
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if (t > m)
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t = m;
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Array.Copy(codec.InputBuffer, nextIn, window, q, t);
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nextIn += t; availIn -= t;
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q += t; m -= t;
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if ((left -= t) != 0)
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break;
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mode = last != 0 ? InflateBlockMode.DRY : InflateBlockMode.TYPE;
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break;
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case InflateBlockMode.TABLE:
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while (bitsNum < 14) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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table = t = (bits & 0x3fff);
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if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29) {
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throw new InvalidDataException("too many length or distance symbols");
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}
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t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
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if (blens == null || blens.Length < t) {
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blens = new int[t];
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} else {
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Array.Clear(blens, 0, t);
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}
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bits >>= 14;
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bitsNum -= 14;
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index = 0;
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mode = InflateBlockMode.BTREE;
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goto case InflateBlockMode.BTREE;
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case InflateBlockMode.BTREE:
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while (index < 4 + (table >> 10)) {
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while (bitsNum < 3) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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blens[border[index++]] = bits & 7;
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bits >>= 3; bitsNum -= 3;
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}
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while (index < 19) {
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blens[border[index++]] = 0;
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}
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bb = 7;
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inftree.InflateTreeBits(blens, ref bb, ref tb, hufts, codec);
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index = 0;
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mode = InflateBlockMode.DTREE;
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goto case InflateBlockMode.DTREE;
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case InflateBlockMode.DTREE:
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while (true) {
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t = table;
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if (!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))) {
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break;
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}
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t = bb;
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while (bitsNum < t) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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t = hufts[(tb + (bits & Constants.InflateMask[t])) * 3 + 1];
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int c = hufts[(tb + (bits & Constants.InflateMask[t])) * 3 + 2];
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if (c < 16) {
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bits >>= t; bitsNum -= t;
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blens[index++] = c;
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} else {
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// c == 16..18
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int i = c == 18 ? 7 : c - 14;
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int j = c == 18 ? 11 : 3;
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while (bitsNum < (t + i)) {
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if (availIn != 0) {
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r = RCode.Okay;
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} else {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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availIn--;
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bits |= codec.InputBuffer[nextIn++] << bitsNum;
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bitsNum += 8;
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}
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bits >>= t; bitsNum -= t;
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j += (bits & Constants.InflateMask[i]);
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bits >>= i; bitsNum -= i;
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i = index;
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if (i + j > 258 + (table & 0x1f) + ((table >> 5) & 0x1f) || (c == 16 && i < 1)) {
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throw new InvalidDataException("invalid bit length repeat");
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}
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c = (c == 16) ? blens[i-1] : 0;
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do {
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blens[i++] = c;
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} while (--j != 0);
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index = i;
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}
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}
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tb = -1;
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{
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int bl = 9; // must be <= 9 for lookahead assumptions
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int bd = 6; // must be <= 9 for lookahead assumptions
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int tl = 0;
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int td = 0;
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inftree.InflateTreesDynamic(257 + (table & 0x1f), 1 + ((table >> 5) & 0x1f), blens,
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ref bl, ref bd, ref tl, ref td, hufts);
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codes.Init(bl, bd, hufts, tl, hufts, td);
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}
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mode = InflateBlockMode.CODES;
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goto case InflateBlockMode.CODES;
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case InflateBlockMode.CODES:
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UpdateState(bits, bitsNum, availIn, nextIn, q);
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r = codes.Process(this, r);
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if (r != RCode.StreamEnd) return Flush(r);
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r = RCode.Okay;
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nextIn = codec.NextIn;
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availIn = codec.AvailableBytesIn;
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bits = bitb;
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bitsNum = bitk;
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q = writeAt;
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m = q < readAt ? readAt - q - 1 : end - q;
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if (last == 0) {
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mode = InflateBlockMode.TYPE;
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break;
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}
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mode = InflateBlockMode.DRY;
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goto case InflateBlockMode.DRY;
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case InflateBlockMode.DRY:
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writeAt = q;
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r = Flush(r);
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q = writeAt;
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m = q < readAt ? readAt - q - 1 : end - q;
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if (readAt != writeAt) {
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
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}
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mode = InflateBlockMode.DONE;
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goto case InflateBlockMode.DONE;
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case InflateBlockMode.DONE:
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return RanOutOfInput(bits, bitsNum, availIn, nextIn, q, RCode.StreamEnd);
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default:
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throw new InvalidOperationException("Invalid inflate block mode: " + mode);
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}
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}
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}
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internal int RanOutOfInput(int bits, int bitsNum, int availIn, int nextIn, int q, int r) {
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bitb = bits;
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bitk = bitsNum;
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codec.AvailableBytesIn = availIn;
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codec.NextIn = nextIn;
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writeAt = q;
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return Flush(r);
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}
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internal void UpdateState(int bits, int bitsNum, int availIn, int nextIn, int q) {
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bitb = bits;
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bitk = bitsNum;
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codec.AvailableBytesIn = availIn;
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codec.NextIn = nextIn;
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writeAt = q;
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}
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internal void Free() {
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Reset();
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window = null;
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hufts = null;
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}
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// copy as much as possible from the sliding window to the output area
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internal int Flush(int r) {
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for (int pass = 0; pass < 2; pass++) {
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int nBytes = pass == 0 ?
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// compute number of bytes to copy as far as end of window
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((readAt <= writeAt ? writeAt : end) - readAt) :
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// compute bytes to copy
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writeAt - readAt;
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// workitem 8870
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if (nBytes == 0) {
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if (r == RCode.BufferError)
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r = RCode.Okay;
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return r;
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}
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if (nBytes > codec.AvailableBytesOut)
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nBytes = codec.AvailableBytesOut;
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if (nBytes != 0 && r == RCode.BufferError)
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r = RCode.Okay;
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// update counters
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codec.AvailableBytesOut -= nBytes;
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// copy as far as end of window
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Array.Copy(window, readAt, codec.OutputBuffer, codec.NextOut, nBytes);
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codec.NextOut += nBytes;
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readAt += nBytes;
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// see if more to copy at beginning of window
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if (readAt == end && pass == 0) {
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// wrap pointers
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readAt = 0;
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if (writeAt == end)
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writeAt = 0;
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} else {
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pass++;
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}
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}
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return r;
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}
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}
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internal static class Constants {
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// And'ing with mask[n] masks the lower n bits
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internal static readonly int[] InflateMask = {
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0x00000000, 0x00000001, 0x00000003, 0x00000007,
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0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
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0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
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0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff };
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}
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sealed class InflateCodes
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{
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// waiting for "i:"=input, "o:"=output, "x:"=nothing
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const int START = 0; // x: set up for LEN
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const int LEN = 1; // i: get length/literal/eob next
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const int LENEXT = 2; // i: getting length extra (have base)
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const int DIST = 3; // i: get distance next
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const int DISTEXT = 4; // i: getting distance extra
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const int COPY = 5; // o: copying bytes in window, waiting for space
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const int LIT = 6; // o: got literal, waiting for output space
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const int WASH = 7; // o: got eob, possibly still output waiting
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const int END = 8; // x: got eob and all data flushed
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const int BADCODE = 9; // x: got error
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int mode; // current inflate_codes mode
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// mode dependent information
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int len;
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int[] tree; // pointer into tree
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int tree_index = 0;
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int need; // bits needed
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int lit;
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// if EXT or COPY, where and how much
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int bitsToGet; // bits to get for extra
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int dist; // distance back to copy from
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byte lbits; // ltree bits decoded per branch
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byte dbits; // dtree bits decoder per branch
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int[] ltree; // literal/length/eob tree
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int ltree_index; // literal/length/eob tree
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int[] dtree; // distance tree
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int dtree_index; // distance tree
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internal void Init(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index) {
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mode = START;
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lbits = (byte)bl;
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dbits = (byte)bd;
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ltree = tl;
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ltree_index = tl_index;
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dtree = td;
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dtree_index = td_index;
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tree = null;
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}
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internal int Process(InflateBlocks blocks, int r)
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{
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int tindex; // temporary pointer
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int e; // extra bits or operation
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ZlibCodec z = blocks.codec;
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int nextIn = z.NextIn;// input data pointer
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int availIn = z.AvailableBytesIn; // bytes available there
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int bits = blocks.bitb; // bit buffer
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int bitsNum = blocks.bitk; // bits in bit buffer
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int q = blocks.writeAt; // output window write pointer
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int m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q; // bytes to end of window or read pointer
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// process input and output based on current state
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while (true)
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{
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switch (mode)
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{
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// waiting for "i:"=input, "o:"=output, "x:"=nothing
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case START: // x: set up for LEN
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if (m >= 258 && availIn >= 10) {
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blocks.UpdateState(bits, bitsNum, availIn, nextIn, q);
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r = InflateFast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, blocks, z);
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nextIn = z.NextIn;
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availIn = z.AvailableBytesIn;
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bits = blocks.bitb;
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bitsNum = blocks.bitk;
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q = blocks.writeAt;
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m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
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if (r != RCode.Okay)
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{
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mode = (r == RCode.StreamEnd) ? WASH : BADCODE;
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break;
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}
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}
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need = lbits;
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tree = ltree;
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tree_index = ltree_index;
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mode = LEN;
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goto case LEN;
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case LEN: // i: get length/literal/eob next
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while (bitsNum < need) {
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if (availIn != 0) {
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|
r = RCode.Okay;
|
|
} else {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
tindex = (tree_index + (bits & Constants.InflateMask[need])) * 3;
|
|
|
|
bits >>= (tree[tindex + 1]);
|
|
bitsNum -= (tree[tindex + 1]);
|
|
|
|
e = tree[tindex];
|
|
|
|
if (e == 0) {
|
|
// literal
|
|
lit = tree[tindex + 2];
|
|
mode = LIT;
|
|
break;
|
|
}
|
|
if ((e & 16) != 0) {
|
|
// length
|
|
bitsToGet = e & 15;
|
|
len = tree[tindex + 2];
|
|
mode = LENEXT;
|
|
break;
|
|
}
|
|
if ((e & 64) == 0) {
|
|
// next table
|
|
need = e;
|
|
tree_index = tindex / 3 + tree[tindex + 2];
|
|
break;
|
|
}
|
|
if ((e & 32) != 0) {
|
|
// end of block
|
|
mode = WASH;
|
|
break;
|
|
}
|
|
throw new InvalidDataException("invalid literal/length code");
|
|
|
|
|
|
case LENEXT: // i: getting length extra (have base)
|
|
while (bitsNum < bitsToGet) {
|
|
if (availIn != 0) {
|
|
r = RCode.Okay;
|
|
} else {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
len += (bits & Constants.InflateMask[bitsToGet]);
|
|
|
|
bits >>= bitsToGet;
|
|
bitsNum -= bitsToGet;
|
|
|
|
need = dbits;
|
|
tree = dtree;
|
|
tree_index = dtree_index;
|
|
mode = DIST;
|
|
goto case DIST;
|
|
|
|
case DIST: // i: get distance next
|
|
while (bitsNum < need) {
|
|
if (availIn != 0) {
|
|
r = RCode.Okay;
|
|
} else {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
tindex = (tree_index + (bits & Constants.InflateMask[need])) * 3;
|
|
|
|
bits >>= tree[tindex + 1];
|
|
bitsNum -= tree[tindex + 1];
|
|
|
|
e = tree[tindex];
|
|
if ((e & 0x10) != 0) {
|
|
// distance
|
|
bitsToGet = e & 15;
|
|
dist = tree[tindex + 2];
|
|
mode = DISTEXT;
|
|
break;
|
|
}
|
|
if ((e & 64) == 0) {
|
|
// next table
|
|
need = e;
|
|
tree_index = tindex / 3 + tree[tindex + 2];
|
|
break;
|
|
}
|
|
throw new InvalidDataException("invalid distance code");
|
|
|
|
|
|
case DISTEXT: // i: getting distance extra
|
|
while (bitsNum < bitsToGet) {
|
|
if (availIn != 0) {
|
|
r = RCode.Okay;
|
|
} else {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
dist += (bits & Constants.InflateMask[bitsToGet]);
|
|
|
|
bits >>= bitsToGet;
|
|
bitsNum -= bitsToGet;
|
|
|
|
mode = COPY;
|
|
goto case COPY;
|
|
|
|
case COPY: // o: copying bytes in window, waiting for space
|
|
int f = q - dist; // pointer to copy strings from
|
|
while (f < 0) {
|
|
// modulo window size-"while" instead
|
|
f += blocks.end; // of "if" handles invalid distances
|
|
}
|
|
while (len != 0) {
|
|
if (m == 0) {
|
|
if (q == blocks.end && blocks.readAt != 0) {
|
|
q = 0;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
}
|
|
|
|
if (m == 0) {
|
|
blocks.writeAt = q;
|
|
r = blocks.Flush(r);
|
|
q = blocks.writeAt;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
|
|
if (q == blocks.end && blocks.readAt != 0) {
|
|
q = 0;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
}
|
|
|
|
if (m == 0) {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
}
|
|
}
|
|
|
|
blocks.window[q++] = blocks.window[f++];
|
|
m--;
|
|
|
|
if (f == blocks.end)
|
|
f = 0;
|
|
len--;
|
|
}
|
|
mode = START;
|
|
break;
|
|
|
|
case LIT: // o: got literal, waiting for output space
|
|
if (m == 0) {
|
|
if (q == blocks.end && blocks.readAt != 0) {
|
|
q = 0;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
}
|
|
|
|
if (m == 0) {
|
|
blocks.writeAt = q;
|
|
r = blocks.Flush(r);
|
|
q = blocks.writeAt;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
|
|
if (q == blocks.end && blocks.readAt != 0)
|
|
{
|
|
q = 0;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
}
|
|
if (m == 0) {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
}
|
|
}
|
|
|
|
r = RCode.Okay;
|
|
blocks.window[q++] = (byte)lit;
|
|
m--;
|
|
mode = START;
|
|
break;
|
|
|
|
case WASH: // o: got eob, possibly more output
|
|
if (bitsNum > 7)
|
|
{
|
|
// return unused byte, if any
|
|
bitsNum -= 8;
|
|
availIn++;
|
|
nextIn--; // can always return one
|
|
}
|
|
|
|
blocks.writeAt = q;
|
|
r = blocks.Flush(r);
|
|
q = blocks.writeAt;
|
|
m = q < blocks.readAt ? blocks.readAt - q - 1 : blocks.end - q;
|
|
|
|
if (blocks.readAt != blocks.writeAt) {
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
}
|
|
mode = END;
|
|
goto case END;
|
|
|
|
case END:
|
|
r = RCode.StreamEnd;
|
|
return blocks.RanOutOfInput(bits, bitsNum, availIn, nextIn, q, r);
|
|
|
|
default:
|
|
throw new InvalidDataException("Encountered error: " + mode);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Called with number of bytes left to write in window at least 258
|
|
// (the maximum string length) and number of input bytes available
|
|
// at least ten. The ten bytes are six bytes for the longest length/
|
|
// distance pair plus four bytes for overloading the bit buffer.
|
|
internal int InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec z)
|
|
{
|
|
int e; // extra bits or operation
|
|
int c; // bytes to copy
|
|
|
|
int nextIn = z.NextIn; // input data pointer
|
|
int availIn = z.AvailableBytesIn; // bytes available there
|
|
int bits = s.bitb; // bit buffer
|
|
int bitsNum = s.bitk; // bits in bit buffer
|
|
int q = s.writeAt; // output window write pointer
|
|
int m = q < s.readAt ? s.readAt - q - 1 : s.end - q; // bytes to end of window or read pointer
|
|
|
|
int ml = Constants.InflateMask[bl]; // mask for literal/length tree
|
|
int md = Constants.InflateMask[bd]; // mask for distance tree
|
|
|
|
// do until not enough input or output space for fast loop
|
|
do {
|
|
// assume called with m >= 258 && n >= 10
|
|
// get literal/length code
|
|
while (bitsNum < 20) {
|
|
// max bits for literal/length code
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
int t = bits & ml; // temporary pointer
|
|
int[] tp = tl;// temporary pointer
|
|
int tp_index = tl_index;// temporary pointer
|
|
int tp_index_t_3 = (tp_index + t) * 3;
|
|
|
|
if ((e = tp[tp_index_t_3]) == 0) {
|
|
bits >>= tp[tp_index_t_3 + 1];
|
|
bitsNum -= tp[tp_index_t_3 + 1];
|
|
|
|
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
|
|
m--;
|
|
continue;
|
|
}
|
|
do {
|
|
bits >>= tp[tp_index_t_3 + 1];
|
|
bitsNum -= tp[tp_index_t_3 + 1];
|
|
|
|
if ((e & 16) != 0) {
|
|
e &= 15;
|
|
c = tp[tp_index_t_3 + 2] + (bits & Constants.InflateMask[e]);
|
|
|
|
bits >>= e; bitsNum -= e;
|
|
|
|
// decode distance base of block to copy
|
|
while (bitsNum < 15) {
|
|
// max bits for distance code
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
t = bits & md;
|
|
tp = td;
|
|
tp_index = td_index;
|
|
tp_index_t_3 = (tp_index + t) * 3;
|
|
e = tp[tp_index_t_3];
|
|
|
|
do {
|
|
bits >>= (tp[tp_index_t_3 + 1]);
|
|
bitsNum -= (tp[tp_index_t_3 + 1]);
|
|
|
|
if ((e & 16) != 0) {
|
|
// get extra bits to add to distance base
|
|
e &= 15;
|
|
while (bitsNum < e) {
|
|
// get extra bits (up to 13)
|
|
availIn--;
|
|
bits |= z.InputBuffer[nextIn++] << bitsNum;
|
|
bitsNum += 8;
|
|
}
|
|
|
|
int d = tp[tp_index_t_3 + 2] + (bits & Constants.InflateMask[e]); // distance back to copy from
|
|
bits >>= e; bitsNum -= e;
|
|
|
|
// do the copy
|
|
int r = q - d; // copy source pointer
|
|
m -= c;
|
|
if (q >= d) {
|
|
// offset before dest, just copy
|
|
if (q - r > 0 && 2 > (q - r)) {
|
|
s.window[q++] = s.window[r++]; // minimum count is three,
|
|
s.window[q++] = s.window[r++]; // so unroll loop a little
|
|
} else {
|
|
Array.Copy(s.window, r, s.window, q, 2);
|
|
q += 2; r += 2;
|
|
}
|
|
c -= 2;
|
|
} else {
|
|
// else offset after destination
|
|
do {
|
|
r += s.end; // force pointer in window
|
|
} while (r < 0); // covers invalid distances
|
|
e = s.end - r;
|
|
if (c > e) {
|
|
// if source crosses,
|
|
c -= e; // wrapped copy
|
|
if (q - r > 0 && e > (q - r)) {
|
|
do {
|
|
s.window[q++] = s.window[r++];
|
|
} while (--e != 0);
|
|
} else {
|
|
Array.Copy(s.window, r, s.window, q, e);
|
|
q += e; r += e; e = 0;
|
|
}
|
|
r = 0; // copy rest from start of window
|
|
}
|
|
}
|
|
|
|
// copy all or what's left
|
|
if (q - r > 0 && c > (q - r)) {
|
|
do {
|
|
s.window[q++] = s.window[r++];
|
|
} while (--c != 0);
|
|
} else {
|
|
Array.Copy(s.window, r, s.window, q, c);
|
|
q += c; r += c;
|
|
c = 0;
|
|
}
|
|
break;
|
|
} else if ((e & 64) == 0) {
|
|
t += tp[tp_index_t_3 + 2];
|
|
t += (bits & Constants.InflateMask[e]);
|
|
tp_index_t_3 = (tp_index + t) * 3;
|
|
e = tp[tp_index_t_3];
|
|
} else {
|
|
throw new InvalidDataException("invalid distance code");
|
|
}
|
|
} while (true);
|
|
break;
|
|
}
|
|
|
|
if ((e & 64) == 0) {
|
|
t += tp[tp_index_t_3 + 2];
|
|
t += (bits & Constants.InflateMask[e]);
|
|
tp_index_t_3 = (tp_index + t) * 3;
|
|
if ((e = tp[tp_index_t_3]) == 0)
|
|
{
|
|
bits >>= (tp[tp_index_t_3 + 1]); bitsNum -= (tp[tp_index_t_3 + 1]);
|
|
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
|
|
m--;
|
|
break;
|
|
}
|
|
} else if ((e & 32) != 0) {
|
|
c = z.AvailableBytesIn - availIn;
|
|
c = (bitsNum >> 3) < c ? bitsNum >> 3 : c;
|
|
availIn += c;
|
|
nextIn -= c;
|
|
bitsNum -= (c << 3);
|
|
|
|
s.UpdateState(bits, bitsNum, availIn, nextIn, q);
|
|
return RCode.StreamEnd;
|
|
} else {
|
|
throw new InvalidDataException("invalid literal/length code");
|
|
}
|
|
} while (true);
|
|
} while (m >= 258 && availIn >= 10);
|
|
|
|
// not enough input or output--restore pointers and return
|
|
c = z.AvailableBytesIn - availIn;
|
|
c = (bitsNum >> 3) < c ? bitsNum >> 3 : c;
|
|
availIn += c;
|
|
nextIn -= c;
|
|
bitsNum -= (c << 3);
|
|
|
|
s.UpdateState(bits, bitsNum, availIn, nextIn, q);
|
|
return RCode.Okay;
|
|
}
|
|
}
|
|
|
|
|
|
internal sealed class InflateManager
|
|
{
|
|
bool done = false;
|
|
ZlibCodec _codec; // pointer back to this zlib stream
|
|
|
|
int wbits; // log2(window size) (8..15, defaults to 15)
|
|
InflateBlocks blocks; // current inflate_blocks state
|
|
|
|
internal void Reset() {
|
|
done = false;
|
|
blocks.Reset();
|
|
}
|
|
|
|
internal void End() {
|
|
if (blocks != null)
|
|
blocks.Free();
|
|
blocks = null;
|
|
}
|
|
|
|
internal void Initialize(ZlibCodec codec, int w) {
|
|
_codec = codec;
|
|
blocks = null;
|
|
|
|
wbits = w;
|
|
blocks = new InflateBlocks(codec, 1 << w);
|
|
Reset();
|
|
}
|
|
|
|
internal int Inflate() {
|
|
if (_codec.InputBuffer == null)
|
|
throw new InvalidOperationException("InputBuffer is null. ");
|
|
|
|
int r = RCode.BufferError;
|
|
if (!done) {
|
|
r = blocks.Process(r);
|
|
if (r == RCode.DataError) {
|
|
throw new InvalidDataException("Bad state");
|
|
}
|
|
|
|
if (r != RCode.StreamEnd)
|
|
return r;
|
|
|
|
blocks.Reset();
|
|
done = true;
|
|
}
|
|
return RCode.StreamEnd;
|
|
}
|
|
}
|
|
}
|
|
#endif |