Ellpeck/MLEM
1
0
Fork 0
mirror of https://github.com/Ellpeck/MLEM.git synced 2024-11-14 18:19:09 +01:00
Code Issues Projects Releases Wiki Activity
MLEM/Demos.Web/wwwroot/js/decode.js

2238 lines
204 KiB
JavaScript
Raw Normal View History

added an experimental kni web demo
2024-09-02 20:33:04 +02:00
/* Copyright 2017 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/**
* @typedef {!Object} Options
* @property {?Int8Array} customDictionary
*/
let Options;
/**
* Private scope / static initializer for decoder.
*
* @return {function(!Int8Array, ?Options=):!Int8Array}
*/
let makeBrotliDecode = () => {
/* GENERATED CODE BEGIN */
/** @type {!Int32Array} */
const MAX_HUFFMAN_TABLE_SIZE = Int32Array.from([256, 402, 436, 468, 500, 534, 566, 598, 630, 662, 694, 726, 758, 790, 822, 854, 886, 920, 952, 984, 1016, 1048, 1080]);
/** @type {!Int32Array} */
const CODE_LENGTH_CODE_ORDER = Int32Array.from([1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
/** @type {!Int32Array} */
const DISTANCE_SHORT_CODE_INDEX_OFFSET = Int32Array.from([0, 3, 2, 1, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3]);
/** @type {!Int32Array} */
const DISTANCE_SHORT_CODE_VALUE_OFFSET = Int32Array.from([0, 0, 0, 0, -1, 1, -2, 2, -3, 3, -1, 1, -2, 2, -3, 3]);
/** @type {!Int32Array} */
const FIXED_TABLE = Int32Array.from([0x020000, 0x020004, 0x020003, 0x030002, 0x020000, 0x020004, 0x020003, 0x040001, 0x020000, 0x020004, 0x020003, 0x030002, 0x020000, 0x020004, 0x020003, 0x040005]);
/** @type {!Int32Array} */
const BLOCK_LENGTH_OFFSET = Int32Array.from([1, 5, 9, 13, 17, 25, 33, 41, 49, 65, 81, 97, 113, 145, 177, 209, 241, 305, 369, 497, 753, 1265, 2289, 4337, 8433, 16625]);
/** @type {!Int32Array} */
const BLOCK_LENGTH_N_BITS = Int32Array.from([2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, 9, 10, 11, 12, 13, 24]);
/** @type {!Int16Array} */
const INSERT_LENGTH_N_BITS = Int16Array.from([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0C, 0x0E, 0x18]);
/** @type {!Int16Array} */
const COPY_LENGTH_N_BITS = Int16Array.from([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x18]);
/** @type {!Int16Array} */
const CMD_LOOKUP = new Int16Array(2816);
{
unpackCommandLookupTable(CMD_LOOKUP);
}
/**
* @param {number} i
* @return {number}
*/
function log2floor(i) {
let /** @type {number} */ result = -1;
let /** @type {number} */ step = 16;
while (step > 0) {
if ((i >>> step) !== 0) {
result += step;
i = i >>> step;
}
step = step >> 1;
}
return result + i;
}
/**
* @param {number} npostfix
* @param {number} ndirect
* @param {number} maxndistbits
* @return {number}
*/
function calculateDistanceAlphabetSize(npostfix, ndirect, maxndistbits) {
return 16 + ndirect + 2 * (maxndistbits << npostfix);
}
/**
* @param {number} maxDistance
* @param {number} npostfix
* @param {number} ndirect
* @return {number}
*/
function calculateDistanceAlphabetLimit(maxDistance, npostfix, ndirect) {
if (maxDistance < ndirect + (2 << npostfix)) {
throw new Error("maxDistance is too small");
}
const /** @type {number} */ offset = ((maxDistance - ndirect) >> npostfix) + 4;
const /** @type {number} */ ndistbits = log2floor(offset) - 1;
const /** @type {number} */ group = ((ndistbits - 1) << 1) | ((offset >> ndistbits) & 1);
return ((group - 1) << npostfix) + (1 << npostfix) + ndirect + 16;
}
/**
* @param {!Int16Array} cmdLookup
* @return {void}
*/
function unpackCommandLookupTable(cmdLookup) {
const /** @type {!Int16Array} */ insertLengthOffsets = new Int16Array(24);
const /** @type {!Int16Array} */ copyLengthOffsets = new Int16Array(24);
copyLengthOffsets[0] = 2;
for (let /** @type {number} */ i = 0; i < 23; ++i) {
insertLengthOffsets[i + 1] = (insertLengthOffsets[i] + (1 << INSERT_LENGTH_N_BITS[i]));
copyLengthOffsets[i + 1] = (copyLengthOffsets[i] + (1 << COPY_LENGTH_N_BITS[i]));
}
for (let /** @type {number} */ cmdCode = 0; cmdCode < 704; ++cmdCode) {
let /** @type {number} */ rangeIdx = cmdCode >>> 6;
let /** @type {number} */ distanceContextOffset = -4;
if (rangeIdx >= 2) {
rangeIdx -= 2;
distanceContextOffset = 0;
}
const /** @type {number} */ insertCode = (((0x29850 >>> (rangeIdx * 2)) & 0x3) << 3) | ((cmdCode >>> 3) & 7);
const /** @type {number} */ copyCode = (((0x26244 >>> (rangeIdx * 2)) & 0x3) << 3) | (cmdCode & 7);
const /** @type {number} */ copyLengthOffset = copyLengthOffsets[copyCode];
const /** @type {number} */ distanceContext = distanceContextOffset + (copyLengthOffset > 4 ? 3 : copyLengthOffset - 2);
const /** @type {number} */ index = cmdCode * 4;
cmdLookup[index] = (INSERT_LENGTH_N_BITS[insertCode] | (COPY_LENGTH_N_BITS[copyCode] << 8));
cmdLookup[index + 1] = insertLengthOffsets[insertCode];
cmdLookup[index + 2] = copyLengthOffsets[copyCode];
cmdLookup[index + 3] = distanceContext;
}
}
/**
* @param {!State} s
* @return {number}
*/
function decodeWindowBits(s) {
const /** @type {number} */ largeWindowEnabled = s.isLargeWindow;
s.isLargeWindow = 0;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
if (readFewBits(s, 1) === 0) {
return 16;
}
let /** @type {number} */ n = readFewBits(s, 3);
if (n !== 0) {
return 17 + n;
}
n = readFewBits(s, 3);
if (n !== 0) {
if (n === 1) {
if (largeWindowEnabled === 0) {
return -1;
}
s.isLargeWindow = 1;
if (readFewBits(s, 1) === 1) {
return -1;
}
n = readFewBits(s, 6);
if (n < 10 || n > 30) {
return -1;
}
return n;
} else {
return 8 + n;
}
}
return 17;
}
/**
* @param {!State} s
* @return {void}
*/
function enableEagerOutput(s) {
if (s.runningState !== 1) {
throw new Error("State MUST be freshly initialized");
}
s.isEager = 1;
}
/**
* @param {!State} s
* @return {void}
*/
function enableLargeWindow(s) {
if (s.runningState !== 1) {
throw new Error("State MUST be freshly initialized");
}
s.isLargeWindow = 1;
}
/**
* @param {!State} s
* @param {!Int8Array} data
* @return {void}
*/
function attachDictionaryChunk(s, data) {
if (s.runningState !== 1) {
throw new Error("State MUST be freshly initialized");
}
if (s.cdNumChunks === 0) {
s.cdChunks = new Array(16);
s.cdChunkOffsets = new Int32Array(16);
s.cdBlockBits = -1;
}
if (s.cdNumChunks === 15) {
throw new Error("Too many dictionary chunks");
}
s.cdChunks[s.cdNumChunks] = data;
s.cdNumChunks++;
s.cdTotalSize += data.length;
s.cdChunkOffsets[s.cdNumChunks] = s.cdTotalSize;
}
/**
* @param {!State} s
* @param {!InputStream} input
* @return {void}
*/
function initState(s, input) {
if (s.runningState !== 0) {
throw new Error("State MUST be uninitialized");
}
s.blockTrees = new Int32Array(3091);
s.blockTrees[0] = 7;
s.distRbIdx = 3;
const /** @type {number} */ maxDistanceAlphabetLimit = calculateDistanceAlphabetLimit(0x7FFFFFFC, 3, 120);
s.distExtraBits = new Int8Array(maxDistanceAlphabetLimit);
s.distOffset = new Int32Array(maxDistanceAlphabetLimit);
s.input = input;
initBitReader(s);
s.runningState = 1;
}
/**
* @param {!State} s
* @return {void}
*/
function close(s) {
if (s.runningState === 0) {
throw new Error("State MUST be initialized");
}
if (s.runningState === 11) {
return;
}
s.runningState = 11;
if (s.input !== null) {
s.input = null;
}
}
/**
* @param {!State} s
* @return {number}
*/
function decodeVarLenUnsignedByte(s) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
if (readFewBits(s, 1) !== 0) {
const /** @type {number} */ n = readFewBits(s, 3);
if (n === 0) {
return 1;
} else {
return readFewBits(s, n) + (1 << n);
}
}
return 0;
}
/**
* @param {!State} s
* @return {void}
*/
function decodeMetaBlockLength(s) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
s.inputEnd = readFewBits(s, 1);
s.metaBlockLength = 0;
s.isUncompressed = 0;
s.isMetadata = 0;
if ((s.inputEnd !== 0) && readFewBits(s, 1) !== 0) {
return;
}
const /** @type {number} */ sizeNibbles = readFewBits(s, 2) + 4;
if (sizeNibbles === 7) {
s.isMetadata = 1;
if (readFewBits(s, 1) !== 0) {
throw new Error("Corrupted reserved bit");
}
const /** @type {number} */ sizeBytes = readFewBits(s, 2);
if (sizeBytes === 0) {
return;
}
for (let /** @type {number} */ i = 0; i < sizeBytes; i++) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ bits = readFewBits(s, 8);
if (bits === 0 && i + 1 === sizeBytes && sizeBytes > 1) {
throw new Error("Exuberant nibble");
}
s.metaBlockLength |= bits << (i * 8);
}
} else {
for (let /** @type {number} */ i = 0; i < sizeNibbles; i++) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ bits = readFewBits(s, 4);
if (bits === 0 && i + 1 === sizeNibbles && sizeNibbles > 4) {
throw new Error("Exuberant nibble");
}
s.metaBlockLength |= bits << (i * 4);
}
}
s.metaBlockLength++;
if (s.inputEnd === 0) {
s.isUncompressed = readFewBits(s, 1);
}
}
/**
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {!State} s
* @return {number}
*/
function readSymbol(tableGroup, tableIdx, s) {
let /** @type {number} */ offset = tableGroup[tableIdx];
const /** @type {number} */ val = (s.accumulator32 >>> s.bitOffset);
offset += val & 0xFF;
const /** @type {number} */ bits = tableGroup[offset] >> 16;
const /** @type {number} */ sym = tableGroup[offset] & 0xFFFF;
if (bits <= 8) {
s.bitOffset += bits;
return sym;
}
offset += sym;
const /** @type {number} */ mask = (1 << bits) - 1;
offset += (val & mask) >>> 8;
s.bitOffset += ((tableGroup[offset] >> 16) + 8);
return tableGroup[offset] & 0xFFFF;
}
/**
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {!State} s
* @return {number}
*/
function readBlockLength(tableGroup, tableIdx, s) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ code = readSymbol(tableGroup, tableIdx, s);
const /** @type {number} */ n = BLOCK_LENGTH_N_BITS[code];
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
return BLOCK_LENGTH_OFFSET[code] + ((n <= 16) ? readFewBits(s, n) : readManyBits(s, n));
}
/**
* @param {!Int32Array} v
* @param {number} index
* @return {void}
*/
function moveToFront(v, index) {
const /** @type {number} */ value = v[index];
for (; index > 0; index--) {
v[index] = v[index - 1];
}
v[0] = value;
}
/**
* @param {!Int8Array} v
* @param {number} vLen
* @return {void}
*/
function inverseMoveToFrontTransform(v, vLen) {
const /** @type {!Int32Array} */ mtf = new Int32Array(256);
for (let /** @type {number} */ i = 0; i < 256; i++) {
mtf[i] = i;
}
for (let /** @type {number} */ i = 0; i < vLen; i++) {
const /** @type {number} */ index = v[i] & 0xFF;
v[i] = mtf[index];
if (index !== 0) {
moveToFront(mtf, index);
}
}
}
/**
* @param {!Int32Array} codeLengthCodeLengths
* @param {number} numSymbols
* @param {!Int32Array} codeLengths
* @param {!State} s
* @return {void}
*/
function readHuffmanCodeLengths(codeLengthCodeLengths, numSymbols, codeLengths, s) {
let /** @type {number} */ symbol = 0;
let /** @type {number} */ prevCodeLen = 8;
let /** @type {number} */ repeat = 0;
let /** @type {number} */ repeatCodeLen = 0;
let /** @type {number} */ space = 32768;
const /** @type {!Int32Array} */ table = new Int32Array(33);
const /** @type {number} */ tableIdx = table.length - 1;
buildHuffmanTable(table, tableIdx, 5, codeLengthCodeLengths, 18);
while (symbol < numSymbols && space > 0) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ p = (s.accumulator32 >>> s.bitOffset) & 31;
s.bitOffset += table[p] >> 16;
const /** @type {number} */ codeLen = table[p] & 0xFFFF;
if (codeLen < 16) {
repeat = 0;
codeLengths[symbol++] = codeLen;
if (codeLen !== 0) {
prevCodeLen = codeLen;
space -= 32768 >> codeLen;
}
} else {
const /** @type {number} */ extraBits = codeLen - 14;
let /** @type {number} */ newLen = 0;
if (codeLen === 16) {
newLen = prevCodeLen;
}
if (repeatCodeLen !== newLen) {
repeat = 0;
repeatCodeLen = newLen;
}
const /** @type {number} */ oldRepeat = repeat;
if (repeat > 0) {
repeat -= 2;
repeat <<= extraBits;
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
repeat += readFewBits(s, extraBits) + 3;
const /** @type {number} */ repeatDelta = repeat - oldRepeat;
if (symbol + repeatDelta > numSymbols) {
throw new Error("symbol + repeatDelta > numSymbols");
}
for (let /** @type {number} */ i = 0; i < repeatDelta; i++) {
codeLengths[symbol++] = repeatCodeLen;
}
if (repeatCodeLen !== 0) {
space -= repeatDelta << (15 - repeatCodeLen);
}
}
}
if (space !== 0) {
throw new Error("Unused space");
}
codeLengths.fill(0, symbol, numSymbols);
}
/**
* @param {!Int32Array} symbols
* @param {number} length
* @return {void}
*/
function checkDupes(symbols, length) {
for (let /** @type {number} */ i = 0; i < length - 1; ++i) {
for (let /** @type {number} */ j = i + 1; j < length; ++j) {
if (symbols[i] === symbols[j]) {
throw new Error("Duplicate simple Huffman code symbol");
}
}
}
}
/**
* @param {number} alphabetSizeMax
* @param {number} alphabetSizeLimit
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {!State} s
* @return {number}
*/
function readSimpleHuffmanCode(alphabetSizeMax, alphabetSizeLimit, tableGroup, tableIdx, s) {
const /** @type {!Int32Array} */ codeLengths = new Int32Array(alphabetSizeLimit);
const /** @type {!Int32Array} */ symbols = new Int32Array(4);
const /** @type {number} */ maxBits = 1 + log2floor(alphabetSizeMax - 1);
const /** @type {number} */ numSymbols = readFewBits(s, 2) + 1;
for (let /** @type {number} */ i = 0; i < numSymbols; i++) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ symbol = readFewBits(s, maxBits);
if (symbol >= alphabetSizeLimit) {
throw new Error("Can't readHuffmanCode");
}
symbols[i] = symbol;
}
checkDupes(symbols, numSymbols);
let /** @type {number} */ histogramId = numSymbols;
if (numSymbols === 4) {
histogramId += readFewBits(s, 1);
}
switch(histogramId) {
case 1:
codeLengths[symbols[0]] = 1;
break;
case 2:
codeLengths[symbols[0]] = 1;
codeLengths[symbols[1]] = 1;
break;
case 3:
codeLengths[symbols[0]] = 1;
codeLengths[symbols[1]] = 2;
codeLengths[symbols[2]] = 2;
break;
case 4:
codeLengths[symbols[0]] = 2;
codeLengths[symbols[1]] = 2;
codeLengths[symbols[2]] = 2;
codeLengths[symbols[3]] = 2;
break;
case 5:
codeLengths[symbols[0]] = 1;
codeLengths[symbols[1]] = 2;
codeLengths[symbols[2]] = 3;
codeLengths[symbols[3]] = 3;
break;
default:
break;
}
return buildHuffmanTable(tableGroup, tableIdx, 8, codeLengths, alphabetSizeLimit);
}
/**
* @param {number} alphabetSizeLimit
* @param {number} skip
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {!State} s
* @return {number}
*/
function readComplexHuffmanCode(alphabetSizeLimit, skip, tableGroup, tableIdx, s) {
const /** @type {!Int32Array} */ codeLengths = new Int32Array(alphabetSizeLimit);
const /** @type {!Int32Array} */ codeLengthCodeLengths = new Int32Array(18);
let /** @type {number} */ space = 32;
let /** @type {number} */ numCodes = 0;
for (let /** @type {number} */ i = skip; i < 18 && space > 0; i++) {
const /** @type {number} */ codeLenIdx = CODE_LENGTH_CODE_ORDER[i];
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ p = (s.accumulator32 >>> s.bitOffset) & 15;
s.bitOffset += FIXED_TABLE[p] >> 16;
const /** @type {number} */ v = FIXED_TABLE[p] & 0xFFFF;
codeLengthCodeLengths[codeLenIdx] = v;
if (v !== 0) {
space -= (32 >> v);
numCodes++;
}
}
if (space !== 0 && numCodes !== 1) {
throw new Error("Corrupted Huffman code histogram");
}
readHuffmanCodeLengths(codeLengthCodeLengths, alphabetSizeLimit, codeLengths, s);
return buildHuffmanTable(tableGroup, tableIdx, 8, codeLengths, alphabetSizeLimit);
}
/**
* @param {number} alphabetSizeMax
* @param {number} alphabetSizeLimit
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {!State} s
* @return {number}
*/
function readHuffmanCode(alphabetSizeMax, alphabetSizeLimit, tableGroup, tableIdx, s) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ simpleCodeOrSkip = readFewBits(s, 2);
if (simpleCodeOrSkip === 1) {
return readSimpleHuffmanCode(alphabetSizeMax, alphabetSizeLimit, tableGroup, tableIdx, s);
} else {
return readComplexHuffmanCode(alphabetSizeLimit, simpleCodeOrSkip, tableGroup, tableIdx, s);
}
}
/**
* @param {number} contextMapSize
* @param {!Int8Array} contextMap
* @param {!State} s
* @return {number}
*/
function decodeContextMap(contextMapSize, contextMap, s) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
const /** @type {number} */ numTrees = decodeVarLenUnsignedByte(s) + 1;
if (numTrees === 1) {
contextMap.fill(0, 0, contextMapSize);
return numTrees;
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ useRleForZeros = readFewBits(s, 1);
let /** @type {number} */ maxRunLengthPrefix = 0;
if (useRleForZeros !== 0) {
maxRunLengthPrefix = readFewBits(s, 4) + 1;
}
const /** @type {number} */ alphabetSize = numTrees + maxRunLengthPrefix;
const /** @type {number} */ tableSize = MAX_HUFFMAN_TABLE_SIZE[(alphabetSize + 31) >> 5];
const /** @type {!Int32Array} */ table = new Int32Array(tableSize + 1);
const /** @type {number} */ tableIdx = table.length - 1;
readHuffmanCode(alphabetSize, alphabetSize, table, tableIdx, s);
for (let /** @type {number} */ i = 0; i < contextMapSize; ) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ code = readSymbol(table, tableIdx, s);
if (code === 0) {
contextMap[i] = 0;
i++;
} else if (code <= maxRunLengthPrefix) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
let /** @type {number} */ reps = (1 << code) + readFewBits(s, code);
while (reps !== 0) {
if (i >= contextMapSize) {
throw new Error("Corrupted context map");
}
contextMap[i] = 0;
i++;
reps--;
}
} else {
contextMap[i] = (code - maxRunLengthPrefix);
i++;
}
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
if (readFewBits(s, 1) === 1) {
inverseMoveToFrontTransform(contextMap, contextMapSize);
}
return numTrees;
}
/**
* @param {!State} s
* @param {number} treeType
* @param {number} numBlockTypes
* @return {number}
*/
function decodeBlockTypeAndLength(s, treeType, numBlockTypes) {
const /** @type {!Int32Array} */ ringBuffers = s.rings;
const /** @type {number} */ offset = 4 + treeType * 2;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
let /** @type {number} */ blockType = readSymbol(s.blockTrees, 2 * treeType, s);
const /** @type {number} */ result = readBlockLength(s.blockTrees, 2 * treeType + 1, s);
if (blockType === 1) {
blockType = ringBuffers[offset + 1] + 1;
} else if (blockType === 0) {
blockType = ringBuffers[offset];
} else {
blockType -= 2;
}
if (blockType >= numBlockTypes) {
blockType -= numBlockTypes;
}
ringBuffers[offset] = ringBuffers[offset + 1];
ringBuffers[offset + 1] = blockType;
return result;
}
/**
* @param {!State} s
* @return {void}
*/
function decodeLiteralBlockSwitch(s) {
s.literalBlockLength = decodeBlockTypeAndLength(s, 0, s.numLiteralBlockTypes);
const /** @type {number} */ literalBlockType = s.rings[5];
s.contextMapSlice = literalBlockType << 6;
s.literalTreeIdx = s.contextMap[s.contextMapSlice] & 0xFF;
const /** @type {number} */ contextMode = s.contextModes[literalBlockType];
s.contextLookupOffset1 = contextMode << 9;
s.contextLookupOffset2 = s.contextLookupOffset1 + 256;
}
/**
* @param {!State} s
* @return {void}
*/
function decodeCommandBlockSwitch(s) {
s.commandBlockLength = decodeBlockTypeAndLength(s, 1, s.numCommandBlockTypes);
s.commandTreeIdx = s.rings[7];
}
/**
* @param {!State} s
* @return {void}
*/
function decodeDistanceBlockSwitch(s) {
s.distanceBlockLength = decodeBlockTypeAndLength(s, 2, s.numDistanceBlockTypes);
s.distContextMapSlice = s.rings[9] << 2;
}
/**
* @param {!State} s
* @return {void}
*/
function maybeReallocateRingBuffer(s) {
let /** @type {number} */ newSize = s.maxRingBufferSize;
if (newSize > s.expectedTotalSize) {
const /** @type {number} */ minimalNewSize = s.expectedTotalSize;
while ((newSize >> 1) > minimalNewSize) {
newSize >>= 1;
}
if ((s.inputEnd === 0) && newSize < 16384 && s.maxRingBufferSize >= 16384) {
newSize = 16384;
}
}
if (newSize <= s.ringBufferSize) {
return;
}
const /** @type {number} */ ringBufferSizeWithSlack = newSize + 37;
const /** @type {!Int8Array} */ newBuffer = new Int8Array(ringBufferSizeWithSlack);
if (s.ringBuffer.length !== 0) {
newBuffer.set(s.ringBuffer.subarray(0, s.ringBufferSize), 0);
}
s.ringBuffer = newBuffer;
s.ringBufferSize = newSize;
}
/**
* @param {!State} s
* @return {void}
*/
function readNextMetablockHeader(s) {
if (s.inputEnd !== 0) {
s.nextRunningState = 10;
s.runningState = 12;
return;
}
s.literalTreeGroup = new Int32Array(0);
s.commandTreeGroup = new Int32Array(0);
s.distanceTreeGroup = new Int32Array(0);
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
decodeMetaBlockLength(s);
if ((s.metaBlockLength === 0) && (s.isMetadata === 0)) {
return;
}
if ((s.isUncompressed !== 0) || (s.isMetadata !== 0)) {
jumpToByteBoundary(s);
s.runningState = (s.isMetadata !== 0) ? 5 : 6;
} else {
s.runningState = 3;
}
if (s.isMetadata !== 0) {
return;
}
s.expectedTotalSize += s.metaBlockLength;
if (s.expectedTotalSize > 1 << 30) {
s.expectedTotalSize = 1 << 30;
}
if (s.ringBufferSize < s.maxRingBufferSize) {
maybeReallocateRingBuffer(s);
}
}
/**
* @param {!State} s
* @param {number} treeType
* @param {number} numBlockTypes
* @return {number}
*/
function readMetablockPartition(s, treeType, numBlockTypes) {
let /** @type {number} */ offset = s.blockTrees[2 * treeType];
if (numBlockTypes <= 1) {
s.blockTrees[2 * treeType + 1] = offset;
s.blockTrees[2 * treeType + 2] = offset;
return 1 << 28;
}
const /** @type {number} */ blockTypeAlphabetSize = numBlockTypes + 2;
offset += readHuffmanCode(blockTypeAlphabetSize, blockTypeAlphabetSize, s.blockTrees, 2 * treeType, s);
s.blockTrees[2 * treeType + 1] = offset;
const /** @type {number} */ blockLengthAlphabetSize = 26;
offset += readHuffmanCode(blockLengthAlphabetSize, blockLengthAlphabetSize, s.blockTrees, 2 * treeType + 1, s);
s.blockTrees[2 * treeType + 2] = offset;
return readBlockLength(s.blockTrees, 2 * treeType + 1, s);
}
/**
* @param {!State} s
* @param {number} alphabetSizeLimit
* @return {void}
*/
function calculateDistanceLut(s, alphabetSizeLimit) {
const /** @type {!Int8Array} */ distExtraBits = s.distExtraBits;
const /** @type {!Int32Array} */ distOffset = s.distOffset;
const /** @type {number} */ npostfix = s.distancePostfixBits;
const /** @type {number} */ ndirect = s.numDirectDistanceCodes;
const /** @type {number} */ postfix = 1 << npostfix;
let /** @type {number} */ bits = 1;
let /** @type {number} */ half = 0;
let /** @type {number} */ i = 16;
for (let /** @type {number} */ j = 0; j < ndirect; ++j) {
distExtraBits[i] = 0;
distOffset[i] = j + 1;
++i;
}
while (i < alphabetSizeLimit) {
const /** @type {number} */ base = ndirect + ((((2 + half) << bits) - 4) << npostfix) + 1;
for (let /** @type {number} */ j = 0; j < postfix; ++j) {
distExtraBits[i] = bits;
distOffset[i] = base + j;
++i;
}
bits = bits + half;
half = half ^ 1;
}
}
/**
* @param {!State} s
* @return {void}
*/
function readMetablockHuffmanCodesAndContextMaps(s) {
s.numLiteralBlockTypes = decodeVarLenUnsignedByte(s) + 1;
s.literalBlockLength = readMetablockPartition(s, 0, s.numLiteralBlockTypes);
s.numCommandBlockTypes = decodeVarLenUnsignedByte(s) + 1;
s.commandBlockLength = readMetablockPartition(s, 1, s.numCommandBlockTypes);
s.numDistanceBlockTypes = decodeVarLenUnsignedByte(s) + 1;
s.distanceBlockLength = readMetablockPartition(s, 2, s.numDistanceBlockTypes);
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
s.distancePostfixBits = readFewBits(s, 2);
s.numDirectDistanceCodes = readFewBits(s, 4) << s.distancePostfixBits;
s.contextModes = new Int8Array(s.numLiteralBlockTypes);
for (let /** @type {number} */ i = 0; i < s.numLiteralBlockTypes; ) {
const /** @type {number} */ limit = Math.min(i + 96, s.numLiteralBlockTypes);
for (; i < limit; ++i) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
s.contextModes[i] = readFewBits(s, 2);
}
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
}
s.contextMap = new Int8Array(s.numLiteralBlockTypes << 6);
const /** @type {number} */ numLiteralTrees = decodeContextMap(s.numLiteralBlockTypes << 6, s.contextMap, s);
s.trivialLiteralContext = 1;
for (let /** @type {number} */ j = 0; j < s.numLiteralBlockTypes << 6; j++) {
if (s.contextMap[j] !== j >> 6) {
s.trivialLiteralContext = 0;
break;
}
}
s.distContextMap = new Int8Array(s.numDistanceBlockTypes << 2);
const /** @type {number} */ numDistTrees = decodeContextMap(s.numDistanceBlockTypes << 2, s.distContextMap, s);
s.literalTreeGroup = decodeHuffmanTreeGroup(256, 256, numLiteralTrees, s);
s.commandTreeGroup = decodeHuffmanTreeGroup(704, 704, s.numCommandBlockTypes, s);
let /** @type {number} */ distanceAlphabetSizeMax = calculateDistanceAlphabetSize(s.distancePostfixBits, s.numDirectDistanceCodes, 24);
let /** @type {number} */ distanceAlphabetSizeLimit = distanceAlphabetSizeMax;
if (s.isLargeWindow === 1) {
distanceAlphabetSizeMax = calculateDistanceAlphabetSize(s.distancePostfixBits, s.numDirectDistanceCodes, 62);
distanceAlphabetSizeLimit = calculateDistanceAlphabetLimit(0x7FFFFFFC, s.distancePostfixBits, s.numDirectDistanceCodes);
}
s.distanceTreeGroup = decodeHuffmanTreeGroup(distanceAlphabetSizeMax, distanceAlphabetSizeLimit, numDistTrees, s);
calculateDistanceLut(s, distanceAlphabetSizeLimit);
s.contextMapSlice = 0;
s.distContextMapSlice = 0;
s.contextLookupOffset1 = s.contextModes[0] * 512;
s.contextLookupOffset2 = s.contextLookupOffset1 + 256;
s.literalTreeIdx = 0;
s.commandTreeIdx = 0;
s.rings[4] = 1;
s.rings[5] = 0;
s.rings[6] = 1;
s.rings[7] = 0;
s.rings[8] = 1;
s.rings[9] = 0;
}
/**
* @param {!State} s
* @return {void}
*/
function copyUncompressedData(s) {
const /** @type {!Int8Array} */ ringBuffer = s.ringBuffer;
if (s.metaBlockLength <= 0) {
reload(s);
s.runningState = 2;
return;
}
const /** @type {number} */ chunkLength = Math.min(s.ringBufferSize - s.pos, s.metaBlockLength);
copyRawBytes(s, ringBuffer, s.pos, chunkLength);
s.metaBlockLength -= chunkLength;
s.pos += chunkLength;
if (s.pos === s.ringBufferSize) {
s.nextRunningState = 6;
s.runningState = 12;
return;
}
reload(s);
s.runningState = 2;
}
/**
* @param {!State} s
* @return {number}
*/
function writeRingBuffer(s) {
const /** @type {number} */ toWrite = Math.min(s.outputLength - s.outputUsed, s.ringBufferBytesReady - s.ringBufferBytesWritten);
if (toWrite !== 0) {
s.output.set(s.ringBuffer.subarray(s.ringBufferBytesWritten, s.ringBufferBytesWritten + toWrite), s.outputOffset + s.outputUsed);
s.outputUsed += toWrite;
s.ringBufferBytesWritten += toWrite;
}
if (s.outputUsed < s.outputLength) {
return 1;
} else {
return 0;
}
}
/**
* @param {number} alphabetSizeMax
* @param {number} alphabetSizeLimit
* @param {number} n
* @param {!State} s
* @return {!Int32Array}
*/
function decodeHuffmanTreeGroup(alphabetSizeMax, alphabetSizeLimit, n, s) {
const /** @type {number} */ maxTableSize = MAX_HUFFMAN_TABLE_SIZE[(alphabetSizeLimit + 31) >> 5];
const /** @type {!Int32Array} */ group = new Int32Array(n + n * maxTableSize);
let /** @type {number} */ next = n;
for (let /** @type {number} */ i = 0; i < n; ++i) {
group[i] = next;
next += readHuffmanCode(alphabetSizeMax, alphabetSizeLimit, group, i, s);
}
return group;
}
/**
* @param {!State} s
* @return {number}
*/
function calculateFence(s) {
let /** @type {number} */ result = s.ringBufferSize;
if (s.isEager !== 0) {
result = Math.min(result, s.ringBufferBytesWritten + s.outputLength - s.outputUsed);
}
return result;
}
/**
* @param {!State} s
* @param {number} fence
* @return {void}
*/
function doUseDictionary(s, fence) {
if (s.distance > 0x7FFFFFFC) {
throw new Error("Invalid backward reference");
}
const /** @type {number} */ address = s.distance - s.maxDistance - 1 - s.cdTotalSize;
if (address < 0) {
initializeCompoundDictionaryCopy(s, -address - 1, s.copyLength);
s.runningState = 14;
} else {
const /** @type {!ByteBuffer} */ dictionaryData = data;
const /** @type {number} */ wordLength = s.copyLength;
if (wordLength > 31) {
throw new Error("Invalid backward reference");
}
const /** @type {number} */ shift = sizeBits[wordLength];
if (shift === 0) {
throw new Error("Invalid backward reference");
}
let /** @type {number} */ offset = offsets[wordLength];
const /** @type {number} */ mask = (1 << shift) - 1;
const /** @type {number} */ wordIdx = address & mask;
const /** @type {number} */ transformIdx = address >>> shift;
offset += wordIdx * wordLength;
const /** @type {!Transforms} */ transforms = RFC_TRANSFORMS;
if (transformIdx >= transforms.numTransforms) {
throw new Error("Invalid backward reference");
}
const /** @type {number} */ len = transformDictionaryWord(s.ringBuffer, s.pos, dictionaryData, offset, wordLength, transforms, transformIdx);
s.pos += len;
s.metaBlockLength -= len;
if (s.pos >= fence) {
s.nextRunningState = 4;
s.runningState = 12;
return;
}
s.runningState = 4;
}
}
/**
* @param {!State} s
* @return {void}
*/
function initializeCompoundDictionary(s) {
s.cdBlockMap = new Int8Array(256);
let /** @type {number} */ blockBits = 8;
while (((s.cdTotalSize - 1) >>> blockBits) !== 0) {
blockBits++;
}
blockBits -= 8;
s.cdBlockBits = blockBits;
let /** @type {number} */ cursor = 0;
let /** @type {number} */ index = 0;
while (cursor < s.cdTotalSize) {
while (s.cdChunkOffsets[index + 1] < cursor) {
index++;
}
s.cdBlockMap[cursor >>> blockBits] = index;
cursor += 1 << blockBits;
}
}
/**
* @param {!State} s
* @param {number} address
* @param {number} length
* @return {void}
*/
function initializeCompoundDictionaryCopy(s, address, length) {
if (s.cdBlockBits === -1) {
initializeCompoundDictionary(s);
}
let /** @type {number} */ index = s.cdBlockMap[address >>> s.cdBlockBits];
while (address >= s.cdChunkOffsets[index + 1]) {
index++;
}
if (s.cdTotalSize > address + length) {
throw new Error("Invalid backward reference");
}
s.distRbIdx = (s.distRbIdx + 1) & 0x3;
s.rings[s.distRbIdx] = s.distance;
s.metaBlockLength -= length;
s.cdBrIndex = index;
s.cdBrOffset = address - s.cdChunkOffsets[index];
s.cdBrLength = length;
s.cdBrCopied = 0;
}
/**
* @param {!State} s
* @param {number} fence
* @return {number}
*/
function copyFromCompoundDictionary(s, fence) {
let /** @type {number} */ pos = s.pos;
const /** @type {number} */ origPos = pos;
while (s.cdBrLength !== s.cdBrCopied) {
const /** @type {number} */ space = fence - pos;
const /** @type {number} */ chunkLength = s.cdChunkOffsets[s.cdBrIndex + 1] - s.cdChunkOffsets[s.cdBrIndex];
const /** @type {number} */ remChunkLength = chunkLength - s.cdBrOffset;
let /** @type {number} */ length = s.cdBrLength - s.cdBrCopied;
if (length > remChunkLength) {
length = remChunkLength;
}
if (length > space) {
length = space;
}
s.ringBuffer.set(s.cdChunks[s.cdBrIndex].slice(s.cdBrOffset, s.cdBrOffset + length), pos);
pos += length;
s.cdBrOffset += length;
s.cdBrCopied += length;
if (length === remChunkLength) {
s.cdBrIndex++;
s.cdBrOffset = 0;
}
if (pos >= fence) {
break;
}
}
return pos - origPos;
}
/**
* @param {!State} s
* @return {void}
*/
function decompress(s) {
if (s.runningState === 0) {
throw new Error("Can't decompress until initialized");
}
if (s.runningState === 11) {
throw new Error("Can't decompress after close");
}
if (s.runningState === 1) {
const /** @type {number} */ windowBits = decodeWindowBits(s);
if (windowBits === -1) {
throw new Error("Invalid 'windowBits' code");
}
s.maxRingBufferSize = 1 << windowBits;
s.maxBackwardDistance = s.maxRingBufferSize - 16;
s.runningState = 2;
}
let /** @type {number} */ fence = calculateFence(s);
let /** @type {number} */ ringBufferMask = s.ringBufferSize - 1;
let /** @type {!Int8Array} */ ringBuffer = s.ringBuffer;
while (s.runningState !== 10) {
switch(s.runningState) {
case 2:
if (s.metaBlockLength < 0) {
throw new Error("Invalid metablock length");
}
readNextMetablockHeader(s);
fence = calculateFence(s);
ringBufferMask = s.ringBufferSize - 1;
ringBuffer = s.ringBuffer;
continue;
case 3:
readMetablockHuffmanCodesAndContextMaps(s);
s.runningState = 4;
case 4:
if (s.metaBlockLength <= 0) {
s.runningState = 2;
continue;
}
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.commandBlockLength === 0) {
decodeCommandBlockSwitch(s);
}
s.commandBlockLength--;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ cmdCode = readSymbol(s.commandTreeGroup, s.commandTreeIdx, s) << 2;
const /** @type {number} */ insertAndCopyExtraBits = CMD_LOOKUP[cmdCode];
const /** @type {number} */ insertLengthOffset = CMD_LOOKUP[cmdCode + 1];
const /** @type {number} */ copyLengthOffset = CMD_LOOKUP[cmdCode + 2];
s.distanceCode = CMD_LOOKUP[cmdCode + 3];
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ insertLengthExtraBits = insertAndCopyExtraBits & 0xFF;
s.insertLength = insertLengthOffset + ((insertLengthExtraBits <= 16) ? readFewBits(s, insertLengthExtraBits) : readManyBits(s, insertLengthExtraBits));
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ copyLengthExtraBits = insertAndCopyExtraBits >> 8;
s.copyLength = copyLengthOffset + ((copyLengthExtraBits <= 16) ? readFewBits(s, copyLengthExtraBits) : readManyBits(s, copyLengthExtraBits));
s.j = 0;
s.runningState = 7;
case 7:
if (s.trivialLiteralContext !== 0) {
while (s.j < s.insertLength) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.literalBlockLength === 0) {
decodeLiteralBlockSwitch(s);
}
s.literalBlockLength--;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
ringBuffer[s.pos] = readSymbol(s.literalTreeGroup, s.literalTreeIdx, s);
s.pos++;
s.j++;
if (s.pos >= fence) {
s.nextRunningState = 7;
s.runningState = 12;
break;
}
}
} else {
let /** @type {number} */ prevByte1 = ringBuffer[(s.pos - 1) & ringBufferMask] & 0xFF;
let /** @type {number} */ prevByte2 = ringBuffer[(s.pos - 2) & ringBufferMask] & 0xFF;
while (s.j < s.insertLength) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.literalBlockLength === 0) {
decodeLiteralBlockSwitch(s);
}
const /** @type {number} */ literalContext = LOOKUP[s.contextLookupOffset1 + prevByte1] | LOOKUP[s.contextLookupOffset2 + prevByte2];
const /** @type {number} */ literalTreeIdx = s.contextMap[s.contextMapSlice + literalContext] & 0xFF;
s.literalBlockLength--;
prevByte2 = prevByte1;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
prevByte1 = readSymbol(s.literalTreeGroup, literalTreeIdx, s);
ringBuffer[s.pos] = prevByte1;
s.pos++;
s.j++;
if (s.pos >= fence) {
s.nextRunningState = 7;
s.runningState = 12;
break;
}
}
}
if (s.runningState !== 7) {
continue;
}
s.metaBlockLength -= s.insertLength;
if (s.metaBlockLength <= 0) {
s.runningState = 4;
continue;
}
let /** @type {number} */ distanceCode = s.distanceCode;
if (distanceCode < 0) {
s.distance = s.rings[s.distRbIdx];
} else {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.distanceBlockLength === 0) {
decodeDistanceBlockSwitch(s);
}
s.distanceBlockLength--;
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
const /** @type {number} */ distTreeIdx = s.distContextMap[s.distContextMapSlice + distanceCode] & 0xFF;
distanceCode = readSymbol(s.distanceTreeGroup, distTreeIdx, s);
if (distanceCode < 16) {
const /** @type {number} */ index = (s.distRbIdx + DISTANCE_SHORT_CODE_INDEX_OFFSET[distanceCode]) & 0x3;
s.distance = s.rings[index] + DISTANCE_SHORT_CODE_VALUE_OFFSET[distanceCode];
if (s.distance < 0) {
throw new Error("Negative distance");
}
} else {
const /** @type {number} */ extraBits = s.distExtraBits[distanceCode];
let /** @type {number} */ bits;
if (s.bitOffset + extraBits <= 32) {
bits = readFewBits(s, extraBits);
} else {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
bits = (extraBits <= 16) ? readFewBits(s, extraBits) : readManyBits(s, extraBits);
}
s.distance = s.distOffset[distanceCode] + (bits << s.distancePostfixBits);
}
}
if (s.maxDistance !== s.maxBackwardDistance && s.pos < s.maxBackwardDistance) {
s.maxDistance = s.pos;
} else {
s.maxDistance = s.maxBackwardDistance;
}
if (s.distance > s.maxDistance) {
s.runningState = 9;
continue;
}
if (distanceCode > 0) {
s.distRbIdx = (s.distRbIdx + 1) & 0x3;
s.rings[s.distRbIdx] = s.distance;
}
if (s.copyLength > s.metaBlockLength) {
throw new Error("Invalid backward reference");
}
s.j = 0;
s.runningState = 8;
case 8:
let /** @type {number} */ src = (s.pos - s.distance) & ringBufferMask;
let /** @type {number} */ dst = s.pos;
const /** @type {number} */ copyLength = s.copyLength - s.j;
const /** @type {number} */ srcEnd = src + copyLength;
const /** @type {number} */ dstEnd = dst + copyLength;
if ((srcEnd < ringBufferMask) && (dstEnd < ringBufferMask)) {
if (copyLength < 12 || (srcEnd > dst && dstEnd > src)) {
for (let /** @type {number} */ k = 0; k < copyLength; k += 4) {
ringBuffer[dst++] = ringBuffer[src++];
ringBuffer[dst++] = ringBuffer[src++];
ringBuffer[dst++] = ringBuffer[src++];
ringBuffer[dst++] = ringBuffer[src++];
}
} else {
ringBuffer.copyWithin(dst, src, srcEnd);
}
s.j += copyLength;
s.metaBlockLength -= copyLength;
s.pos += copyLength;
} else {
for (; s.j < s.copyLength; ) {
ringBuffer[s.pos] = ringBuffer[(s.pos - s.distance) & ringBufferMask];
s.metaBlockLength--;
s.pos++;
s.j++;
if (s.pos >= fence) {
s.nextRunningState = 8;
s.runningState = 12;
break;
}
}
}
if (s.runningState === 8) {
s.runningState = 4;
}
continue;
case 9:
doUseDictionary(s, fence);
continue;
case 14:
s.pos += copyFromCompoundDictionary(s, fence);
if (s.pos >= fence) {
s.nextRunningState = 14;
s.runningState = 12;
return;
}
s.runningState = 4;
continue;
case 5:
while (s.metaBlockLength > 0) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
readFewBits(s, 8);
s.metaBlockLength--;
}
s.runningState = 2;
continue;
case 6:
copyUncompressedData(s);
continue;
case 12:
s.ringBufferBytesReady = Math.min(s.pos, s.ringBufferSize);
s.runningState = 13;
case 13:
if (writeRingBuffer(s) === 0) {
return;
}
if (s.pos >= s.maxBackwardDistance) {
s.maxDistance = s.maxBackwardDistance;
}
if (s.pos >= s.ringBufferSize) {
if (s.pos > s.ringBufferSize) {
ringBuffer.copyWithin(0, s.ringBufferSize, s.pos);
}
s.pos &= ringBufferMask;
s.ringBufferBytesWritten = 0;
}
s.runningState = s.nextRunningState;
continue;
default:
throw new Error("Unexpected state " + valueOf(s.runningState));
}
}
if (s.runningState === 10) {
if (s.metaBlockLength < 0) {
throw new Error("Invalid metablock length");
}
jumpToByteBoundary(s);
checkHealth(s, 1);
}
}
/**
* @constructor
* @param {number} numTransforms
* @param {number} prefixSuffixLen
* @param {number} prefixSuffixCount
* @struct
*/
function Transforms(numTransforms, prefixSuffixLen, prefixSuffixCount) {
/** @type {number} */
this.numTransforms = 0;
/** @type {!Int32Array} */
this.triplets = new Int32Array(0);
/** @type {!Int8Array} */
this.prefixSuffixStorage = new Int8Array(0);
/** @type {!Int32Array} */
this.prefixSuffixHeads = new Int32Array(0);
/** @type {!Int16Array} */
this.params = new Int16Array(0);
this.numTransforms = numTransforms;
this.triplets = new Int32Array(numTransforms * 3);
this.params = new Int16Array(numTransforms);
this.prefixSuffixStorage = new Int8Array(prefixSuffixLen);
this.prefixSuffixHeads = new Int32Array(prefixSuffixCount + 1);
}
/** @type {!Transforms} */
const RFC_TRANSFORMS = new Transforms(121, 167, 50);
/**
* @param {!Int8Array} prefixSuffix
* @param {!Int32Array} prefixSuffixHeads
* @param {!Int32Array} transforms
* @param {string} prefixSuffixSrc
* @param {string} transformsSrc
* @return {void}
*/
function unpackTransforms(prefixSuffix, prefixSuffixHeads, transforms, prefixSuffixSrc, transformsSrc) {
const /** @type {number} */ n = prefixSuffixSrc.length;
let /** @type {number} */ index = 1;
let /** @type {number} */ j = 0;
for (let /** @type {number} */ i = 0; i < n; ++i) {
const /** @type {number} */ c = prefixSuffixSrc.charCodeAt(i);
if (c === 35) {
prefixSuffixHeads[index++] = j;
} else {
prefixSuffix[j++] = c;
}
}
for (let /** @type {number} */ i = 0; i < 363; ++i) {
transforms[i] = transformsSrc.charCodeAt(i) - 32;
}
}
{
unpackTransforms(RFC_TRANSFORMS.prefixSuffixStorage, RFC_TRANSFORMS.prefixSuffixHeads, RFC_TRANSFORMS.triplets, "# #s #, #e #.# the #.com/#\xC2\xA0# of # and # in # to #\"#\">#\n#]# for # a # that #. # with #'# from # by #. The # on # as # is #ing #\n\t#:#ed #(# at #ly #=\"# of the #. This #,# not #er #al #='#ful #ive #less #est #ize #ous #", " !! ! , *! &! \" ! ) * * - ! # ! #!*! + ,$ ! - % . / # 0 1 . \" 2 3!* 4% ! # / 5 6 7 8 0 1 & $ 9 + : ; < ' != > ?! 4 @ 4 2 & A *# ( B C& ) % ) !*# *-% A +! *. D! %' & E *6 F G% ! *A *% H! D I!+! J!+ K +- *4! A L!*4 M N +6 O!*% +.! K *G P +%( ! G *D +D Q +# *K!*G!+D!+# +G +A +4!+% +K!+4!*D!+K!*K");
}
/**
* @param {!Int8Array} dst
* @param {number} dstOffset
* @param {!Int8Array} src
* @param {number} srcOffset
* @param {number} len
* @param {!Transforms} transforms
* @param {number} transformIndex
* @return {number}
*/
function transformDictionaryWord(dst, dstOffset, src, srcOffset, len, transforms, transformIndex) {
let /** @type {number} */ offset = dstOffset;
const /** @type {!Int32Array} */ triplets = transforms.triplets;
const /** @type {!Int8Array} */ prefixSuffixStorage = transforms.prefixSuffixStorage;
const /** @type {!Int32Array} */ prefixSuffixHeads = transforms.prefixSuffixHeads;
const /** @type {number} */ transformOffset = 3 * transformIndex;
const /** @type {number} */ prefixIdx = triplets[transformOffset];
const /** @type {number} */ transformType = triplets[transformOffset + 1];
const /** @type {number} */ suffixIdx = triplets[transformOffset + 2];
let /** @type {number} */ prefix = prefixSuffixHeads[prefixIdx];
const /** @type {number} */ prefixEnd = prefixSuffixHeads[prefixIdx + 1];
let /** @type {number} */ suffix = prefixSuffixHeads[suffixIdx];
const /** @type {number} */ suffixEnd = prefixSuffixHeads[suffixIdx + 1];
let /** @type {number} */ omitFirst = transformType - 11;
let /** @type {number} */ omitLast = transformType;
if (omitFirst < 1 || omitFirst > 9) {
omitFirst = 0;
}
if (omitLast < 1 || omitLast > 9) {
omitLast = 0;
}
while (prefix !== prefixEnd) {
dst[offset++] = prefixSuffixStorage[prefix++];
}
if (omitFirst > len) {
omitFirst = len;
}
srcOffset += omitFirst;
len -= omitFirst;
len -= omitLast;
let /** @type {number} */ i = len;
while (i > 0) {
dst[offset++] = src[srcOffset++];
i--;
}
if (transformType === 10 || transformType === 11) {
let /** @type {number} */ uppercaseOffset = offset - len;
if (transformType === 10) {
len = 1;
}
while (len > 0) {
const /** @type {number} */ c0 = dst[uppercaseOffset] & 0xFF;
if (c0 < 0xC0) {
if (c0 >= 97 && c0 <= 122) {
dst[uppercaseOffset] ^= 32;
}
uppercaseOffset += 1;
len -= 1;
} else if (c0 < 0xE0) {
dst[uppercaseOffset + 1] ^= 32;
uppercaseOffset += 2;
len -= 2;
} else {
dst[uppercaseOffset + 2] ^= 5;
uppercaseOffset += 3;
len -= 3;
}
}
} else if (transformType === 21 || transformType === 22) {
let /** @type {number} */ shiftOffset = offset - len;
const /** @type {number} */ param = transforms.params[transformIndex];
let /** @type {number} */ scalar = (param & 0x7FFF) + (0x1000000 - (param & 0x8000));
while (len > 0) {
let /** @type {number} */ step = 1;
const /** @type {number} */ c0 = dst[shiftOffset] & 0xFF;
if (c0 < 0x80) {
scalar += c0;
dst[shiftOffset] = (scalar & 0x7F);
} else if (c0 < 0xC0) {
} else if (c0 < 0xE0) {
if (len >= 2) {
const /** @type {number} */ c1 = dst[shiftOffset + 1];
scalar += (c1 & 0x3F) | ((c0 & 0x1F) << 6);
dst[shiftOffset] = (0xC0 | ((scalar >> 6) & 0x1F));
dst[shiftOffset + 1] = ((c1 & 0xC0) | (scalar & 0x3F));
step = 2;
} else {
step = len;
}
} else if (c0 < 0xF0) {
if (len >= 3) {
const /** @type {number} */ c1 = dst[shiftOffset + 1];
const /** @type {number} */ c2 = dst[shiftOffset + 2];
scalar += (c2 & 0x3F) | ((c1 & 0x3F) << 6) | ((c0 & 0x0F) << 12);
dst[shiftOffset] = (0xE0 | ((scalar >> 12) & 0x0F));
dst[shiftOffset + 1] = ((c1 & 0xC0) | ((scalar >> 6) & 0x3F));
dst[shiftOffset + 2] = ((c2 & 0xC0) | (scalar & 0x3F));
step = 3;
} else {
step = len;
}
} else if (c0 < 0xF8) {
if (len >= 4) {
const /** @type {number} */ c1 = dst[shiftOffset + 1];
const /** @type {number} */ c2 = dst[shiftOffset + 2];
const /** @type {number} */ c3 = dst[shiftOffset + 3];
scalar += (c3 & 0x3F) | ((c2 & 0x3F) << 6) | ((c1 & 0x3F) << 12) | ((c0 & 0x07) << 18);
dst[shiftOffset] = (0xF0 | ((scalar >> 18) & 0x07));
dst[shiftOffset + 1] = ((c1 & 0xC0) | ((scalar >> 12) & 0x3F));
dst[shiftOffset + 2] = ((c2 & 0xC0) | ((scalar >> 6) & 0x3F));
dst[shiftOffset + 3] = ((c3 & 0xC0) | (scalar & 0x3F));
step = 4;
} else {
step = len;
}
}
shiftOffset += step;
len -= step;
if (transformType === 21) {
len = 0;
}
}
}
while (suffix !== suffixEnd) {
dst[offset++] = prefixSuffixStorage[suffix++];
}
return offset - dstOffset;
}
/**
* @param {number} key
* @param {number} len
* @return {number}
*/
function getNextKey(key, len) {
let /** @type {number} */ step = 1 << (len - 1);
while ((key & step) !== 0) {
step >>= 1;
}
return (key & (step - 1)) + step;
}
/**
* @param {!Int32Array} table
* @param {number} offset
* @param {number} step
* @param {number} end
* @param {number} item
* @return {void}
*/
function replicateValue(table, offset, step, end, item) {
do {
end -= step;
table[offset + end] = item;
} while (end > 0);
}
/**
* @param {!Int32Array} count
* @param {number} len
* @param {number} rootBits
* @return {number}
*/
function nextTableBitSize(count, len, rootBits) {
let /** @type {number} */ left = 1 << (len - rootBits);
while (len < 15) {
left -= count[len];
if (left <= 0) {
break;
}
len++;
left <<= 1;
}
return len - rootBits;
}
/**
* @param {!Int32Array} tableGroup
* @param {number} tableIdx
* @param {number} rootBits
* @param {!Int32Array} codeLengths
* @param {number} codeLengthsSize
* @return {number}
*/
function buildHuffmanTable(tableGroup, tableIdx, rootBits, codeLengths, codeLengthsSize) {
const /** @type {number} */ tableOffset = tableGroup[tableIdx];
let /** @type {number} */ key;
const /** @type {!Int32Array} */ sorted = new Int32Array(codeLengthsSize);
const /** @type {!Int32Array} */ count = new Int32Array(16);
const /** @type {!Int32Array} */ offset = new Int32Array(16);
let /** @type {number} */ symbol;
for (symbol = 0; symbol < codeLengthsSize; symbol++) {
count[codeLengths[symbol]]++;
}
offset[1] = 0;
for (let /** @type {number} */ len = 1; len < 15; len++) {
offset[len + 1] = offset[len] + count[len];
}
for (symbol = 0; symbol < codeLengthsSize; symbol++) {
if (codeLengths[symbol] !== 0) {
sorted[offset[codeLengths[symbol]]++] = symbol;
}
}
let /** @type {number} */ tableBits = rootBits;
let /** @type {number} */ tableSize = 1 << tableBits;
let /** @type {number} */ totalSize = tableSize;
if (offset[15] === 1) {
for (key = 0; key < totalSize; key++) {
tableGroup[tableOffset + key] = sorted[0];
}
return totalSize;
}
key = 0;
symbol = 0;
for (let /** @type {number} */ len = 1, /** @type {number} */ step = 2; len <= rootBits; len++, step <<= 1) {
for (; count[len] > 0; count[len]--) {
replicateValue(tableGroup, tableOffset + key, step, tableSize, len << 16 | sorted[symbol++]);
key = getNextKey(key, len);
}
}
const /** @type {number} */ mask = totalSize - 1;
let /** @type {number} */ low = -1;
let /** @type {number} */ currentOffset = tableOffset;
for (let /** @type {number} */ len = rootBits + 1, /** @type {number} */ step = 2; len <= 15; len++, step <<= 1) {
for (; count[len] > 0; count[len]--) {
if ((key & mask) !== low) {
currentOffset += tableSize;
tableBits = nextTableBitSize(count, len, rootBits);
tableSize = 1 << tableBits;
totalSize += tableSize;
low = key & mask;
tableGroup[tableOffset + low] = (tableBits + rootBits) << 16 | (currentOffset - tableOffset - low);
}
replicateValue(tableGroup, currentOffset + (key >> rootBits), step, tableSize, (len - rootBits) << 16 | sorted[symbol++]);
key = getNextKey(key, len);
}
}
return totalSize;
}
/**
* @param {!State} s
* @return {void}
*/
function doReadMoreInput(s) {
if (s.endOfStreamReached !== 0) {
if (halfAvailable(s) >= -2) {
return;
}
throw new Error("No more input");
}
const /** @type {number} */ readOffset = s.halfOffset << 1;
let /** @type {number} */ bytesInBuffer = 4096 - readOffset;
s.byteBuffer.copyWithin(0, readOffset, 4096);
s.halfOffset = 0;
while (bytesInBuffer < 4096) {
const /** @type {number} */ spaceLeft = 4096 - bytesInBuffer;
const /** @type {number} */ len = readInput(s.input, s.byteBuffer, bytesInBuffer, spaceLeft);
if (len <= 0) {
s.endOfStreamReached = 1;
s.tailBytes = bytesInBuffer;
bytesInBuffer += 1;
break;
}
bytesInBuffer += len;
}
bytesToNibbles(s, bytesInBuffer);
}
/**
* @param {!State} s
* @param {number} endOfStream
* @return {void}
*/
function checkHealth(s, endOfStream) {
if (s.endOfStreamReached === 0) {
return;
}
const /** @type {number} */ byteOffset = (s.halfOffset << 1) + ((s.bitOffset + 7) >> 3) - 4;
if (byteOffset > s.tailBytes) {
throw new Error("Read after end");
}
if ((endOfStream !== 0) && (byteOffset !== s.tailBytes)) {
throw new Error("Unused bytes after end");
}
}
/**
* @param {!State} s
* @param {number} n
* @return {number}
*/
function readFewBits(s, n) {
const /** @type {number} */ val = (s.accumulator32 >>> s.bitOffset) & ((1 << n) - 1);
s.bitOffset += n;
return val;
}
/**
* @param {!State} s
* @param {number} n
* @return {number}
*/
function readManyBits(s, n) {
const /** @type {number} */ low = readFewBits(s, 16);
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
return low | (readFewBits(s, n - 16) << 16);
}
/**
* @param {!State} s
* @return {void}
*/
function initBitReader(s) {
s.byteBuffer = new Int8Array(4160);
s.accumulator32 = 0;
s.shortBuffer = new Int16Array(2080);
s.bitOffset = 32;
s.halfOffset = 2048;
s.endOfStreamReached = 0;
prepare(s);
}
/**
* @param {!State} s
* @return {void}
*/
function prepare(s) {
if (s.halfOffset > 2030) {
doReadMoreInput(s);
}
checkHealth(s, 0);
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
/**
* @param {!State} s
* @return {void}
*/
function reload(s) {
if (s.bitOffset === 32) {
prepare(s);
}
}
/**
* @param {!State} s
* @return {void}
*/
function jumpToByteBoundary(s) {
const /** @type {number} */ padding = (32 - s.bitOffset) & 7;
if (padding !== 0) {
const /** @type {number} */ paddingBits = readFewBits(s, padding);
if (paddingBits !== 0) {
throw new Error("Corrupted padding bits");
}
}
}
/**
* @param {!State} s
* @return {number}
*/
function halfAvailable(s) {
let /** @type {number} */ limit = 2048;
if (s.endOfStreamReached !== 0) {
limit = (s.tailBytes + 1) >> 1;
}
return limit - s.halfOffset;
}
/**
* @param {!State} s
* @param {!Int8Array} data
* @param {number} offset
* @param {number} length
* @return {void}
*/
function copyRawBytes(s, data, offset, length) {
if ((s.bitOffset & 7) !== 0) {
throw new Error("Unaligned copyBytes");
}
while ((s.bitOffset !== 32) && (length !== 0)) {
data[offset++] = (s.accumulator32 >>> s.bitOffset);
s.bitOffset += 8;
length--;
}
if (length === 0) {
return;
}
const /** @type {number} */ copyNibbles = Math.min(halfAvailable(s), length >> 1);
if (copyNibbles > 0) {
const /** @type {number} */ readOffset = s.halfOffset << 1;
const /** @type {number} */ delta = copyNibbles << 1;
data.set(s.byteBuffer.subarray(readOffset, readOffset + delta), offset);
offset += delta;
length -= delta;
s.halfOffset += copyNibbles;
}
if (length === 0) {
return;
}
if (halfAvailable(s) > 0) {
if (s.bitOffset >= 16) {
s.accumulator32 = (s.shortBuffer[s.halfOffset++] << 16) | (s.accumulator32 >>> 16);
s.bitOffset -= 16;
}
while (length !== 0) {
data[offset++] = (s.accumulator32 >>> s.bitOffset);
s.bitOffset += 8;
length--;
}
checkHealth(s, 0);
return;
}
while (length > 0) {
const /** @type {number} */ len = readInput(s.input, data, offset, length);
if (len === -1) {
throw new Error("Unexpected end of input");
}
offset += len;
length -= len;
}
}
/**
* @param {!State} s
* @param {number} byteLen
* @return {void}
*/
function bytesToNibbles(s, byteLen) {
const /** @type {!Int8Array} */ byteBuffer = s.byteBuffer;
const /** @type {number} */ halfLen = byteLen >> 1;
const /** @type {!Int16Array} */ shortBuffer = s.shortBuffer;
for (let /** @type {number} */ i = 0; i < halfLen; ++i) {
shortBuffer[i] = ((byteBuffer[i * 2] & 0xFF) | ((byteBuffer[(i * 2) + 1] & 0xFF) << 8));
}
}
/** @type {!Int32Array} */
const LOOKUP = new Int32Array(2048);
/**
* @param {!Int32Array} lookup
* @param {string} map
* @param {string} rle
* @return {void}
*/
function unpackLookupTable(lookup, map, rle) {
for (let /** @type {number} */ i = 0; i < 256; ++i) {
lookup[i] = i & 0x3F;
lookup[512 + i] = i >> 2;
lookup[1792 + i] = 2 + (i >> 6);
}
for (let /** @type {number} */ i = 0; i < 128; ++i) {
lookup[1024 + i] = 4 * (map.charCodeAt(i) - 32);
}
for (let /** @type {number} */ i = 0; i < 64; ++i) {
lookup[1152 + i] = i & 1;
lookup[1216 + i] = 2 + (i & 1);
}
let /** @type {number} */ offset = 1280;
for (let /** @type {number} */ k = 0; k < 19; ++k) {
const /** @type {number} */ value = k & 3;
const /** @type {number} */ rep = rle.charCodeAt(k) - 32;
for (let /** @type {number} */ i = 0; i < rep; ++i) {
lookup[offset++] = value;
}
}
for (let /** @type {number} */ i = 0; i < 16; ++i) {
lookup[1792 + i] = 1;
lookup[2032 + i] = 6;
}
lookup[1792] = 0;
lookup[2047] = 7;
for (let /** @type {number} */ i = 0; i < 256; ++i) {
lookup[1536 + i] = lookup[1792 + i] << 3;
}
}
{
unpackLookupTable(LOOKUP, " !! ! \"#$##%#$&'##(#)#++++++++++((&*'##,---,---,-----,-----,-----&#'###.///.///./////./////./////&#'# ", "A/* ': & : $ \x81 @");
}
/**
* @constructor
* @struct
*/
function State() {
/** @type {!Int8Array} */
this.ringBuffer = new Int8Array(0);
/** @type {!Int8Array} */
this.contextModes = new Int8Array(0);
/** @type {!Int8Array} */
this.contextMap = new Int8Array(0);
/** @type {!Int8Array} */
this.distContextMap = new Int8Array(0);
/** @type {!Int8Array} */
this.distExtraBits = new Int8Array(0);
/** @type {!Int8Array} */
this.output = new Int8Array(0);
/** @type {!Int8Array} */
this.byteBuffer = new Int8Array(0);
/** @type {!Int16Array} */
this.shortBuffer = new Int16Array(0);
/** @type {!Int32Array} */
this.intBuffer = new Int32Array(0);
/** @type {!Int32Array} */
this.rings = new Int32Array(0);
/** @type {!Int32Array} */
this.blockTrees = new Int32Array(0);
/** @type {!Int32Array} */
this.literalTreeGroup = new Int32Array(0);
/** @type {!Int32Array} */
this.commandTreeGroup = new Int32Array(0);
/** @type {!Int32Array} */
this.distanceTreeGroup = new Int32Array(0);
/** @type {!Int32Array} */
this.distOffset = new Int32Array(0);
/** @type {number} */
this.accumulator64 = 0;
/** @type {number} */
this.runningState = 0;
/** @type {number} */
this.nextRunningState = 0;
/** @type {number} */
this.accumulator32 = 0;
/** @type {number} */
this.bitOffset = 0;
/** @type {number} */
this.halfOffset = 0;
/** @type {number} */
this.tailBytes = 0;
/** @type {number} */
this.endOfStreamReached = 0;
/** @type {number} */
this.metaBlockLength = 0;
/** @type {number} */
this.inputEnd = 0;
/** @type {number} */
this.isUncompressed = 0;
/** @type {number} */
this.isMetadata = 0;
/** @type {number} */
this.literalBlockLength = 0;
/** @type {number} */
this.numLiteralBlockTypes = 0;
/** @type {number} */
this.commandBlockLength = 0;
/** @type {number} */
this.numCommandBlockTypes = 0;
/** @type {number} */
this.distanceBlockLength = 0;
/** @type {number} */
this.numDistanceBlockTypes = 0;
/** @type {number} */
this.pos = 0;
/** @type {number} */
this.maxDistance = 0;
/** @type {number} */
this.distRbIdx = 0;
/** @type {number} */
this.trivialLiteralContext = 0;
/** @type {number} */
this.literalTreeIdx = 0;
/** @type {number} */
this.commandTreeIdx = 0;
/** @type {number} */
this.j = 0;
/** @type {number} */
this.insertLength = 0;
/** @type {number} */
this.contextMapSlice = 0;
/** @type {number} */
this.distContextMapSlice = 0;
/** @type {number} */
this.contextLookupOffset1 = 0;
/** @type {number} */
this.contextLookupOffset2 = 0;
/** @type {number} */
this.distanceCode = 0;
/** @type {number} */
this.numDirectDistanceCodes = 0;
/** @type {number} */
this.distancePostfixBits = 0;
/** @type {number} */
this.distance = 0;
/** @type {number} */
this.copyLength = 0;
/** @type {number} */
this.maxBackwardDistance = 0;
/** @type {number} */
this.maxRingBufferSize = 0;
/** @type {number} */
this.ringBufferSize = 0;
/** @type {number} */
this.expectedTotalSize = 0;
/** @type {number} */
this.outputOffset = 0;
/** @type {number} */
this.outputLength = 0;
/** @type {number} */
this.outputUsed = 0;
/** @type {number} */
this.ringBufferBytesWritten = 0;
/** @type {number} */
this.ringBufferBytesReady = 0;
/** @type {number} */
this.isEager = 0;
/** @type {number} */
this.isLargeWindow = 0;
/** @type {number} */
this.cdNumChunks = 0;
/** @type {number} */
this.cdTotalSize = 0;
/** @type {number} */
this.cdBrIndex = 0;
/** @type {number} */
this.cdBrOffset = 0;
/** @type {number} */
this.cdBrLength = 0;
/** @type {number} */
this.cdBrCopied = 0;
/** @type {!Array<?Int8Array>} */
this.cdChunks = new Array(0);
/** @type {!Int32Array} */
this.cdChunkOffsets = new Int32Array(0);
/** @type {number} */
this.cdBlockBits = 0;
/** @type {!Int8Array} */
this.cdBlockMap = new Int8Array(0);
/** @type {!InputStream|null} */
this.input = null;
this.ringBuffer = new Int8Array(0);
this.rings = new Int32Array(10);
this.rings[0] = 16;
this.rings[1] = 15;
this.rings[2] = 11;
this.rings[3] = 4;
}
/** @type {!ByteBuffer} */
let data = new Int8Array(0);
/** @type {!Int32Array} */
const offsets = new Int32Array(32);
/** @type {!Int32Array} */
const sizeBits = new Int32Array(32);
/**
* @param {!Int8Array} newData
* @param {!Int32Array} newSizeBits
* @return {void}
*/
function setData(newData, newSizeBits) {
if (newSizeBits.length > 31) {
throw new Error("sizeBits length must be at most " + valueOf(31));
}
for (let /** @type {number} */ i = 0; i < 4; ++i) {
if (newSizeBits[i] !== 0) {
throw new Error("first " + valueOf(4) + " must be 0");
}
}
const /** @type {!Int32Array} */ dictionaryOffsets = offsets;
const /** @type {!Int32Array} */ dictionarySizeBits = sizeBits;
dictionarySizeBits.set(newSizeBits.subarray(0, newSizeBits.length), 0);
let /** @type {number} */ pos = 0;
const /** @type {number} */ limit = newData.length;
for (let /** @type {number} */ i = 0; i < newSizeBits.length; ++i) {
dictionaryOffsets[i] = pos;
const /** @type {number} */ bits = dictionarySizeBits[i];
if (bits !== 0) {
if (bits >= 31) {
throw new Error("newSizeBits values must be less than 31");
}
pos += i << bits;
if (pos <= 0 || pos > limit) {
throw new Error("newSizeBits is inconsistent: overflow");
}
}
}
for (let /** @type {number} */ i = newSizeBits.length; i < 32; ++i) {
dictionaryOffsets[i] = pos;
}
if (pos !== limit) {
throw new Error("newSizeBits is inconsistent: underflow");
}
data = newData;
}
/**
* @param {!Int8Array} dictionary
* @param {string} data0
* @param {string} data1
* @param {string} skipFlip
* @param {!Int32Array} sizeBits
* @param {string} sizeBitsData
* @return {void}
*/
function unpackDictionaryData(dictionary, data0, data1, skipFlip, sizeBits, sizeBitsData) {
const /** @type {!Int8Array} */ dict = toUsAsciiBytes(data0 + data1);
if (dict.length !== dictionary.length) {
throw new Error("Corrupted brotli dictionary");
}
let /** @type {number} */ offset = 0;
const /** @type {number} */ n = skipFlip.length;
for (let /** @type {number} */ i = 0; i < n; i += 2) {
const /** @type {number} */ skip = skipFlip.charCodeAt(i) - 36;
const /** @type {number} */ flip = skipFlip.charCodeAt(i + 1) - 36;
for (let /** @type {number} */ j = 0; j < skip; ++j) {
dict[offset] ^= 3;
offset++;
}
for (let /** @type {number} */ j = 0; j < flip; ++j) {
dict[offset] ^= 236;
offset++;
}
}
for (let /** @type {number} */ i = 0; i < sizeBitsData.length; ++i) {
sizeBits[i] = sizeBitsData.charCodeAt(i) - 65;
}
dictionary.set(dict);
}
{
const /** @type {!ByteBuffer} */ dictionaryData = new Int8Array(122784);
const /** @type {!Int32Array} */ dictionarySizeBits = new Int32Array(25);
unpackDictionaryData(dictionaryData, "wjnfgltmojefofewab`h`lgfgbwbpkltlmozpjwf`jwzlsfmivpwojhfeqfftlqhwf{wzfbqlufqalgzolufelqnallhsobzojufojmfkfosklnfpjgfnlqftlqgolmdwkfnujftejmgsbdfgbzpevookfbgwfqnfb`kbqfbeqlnwqvfnbqhbaofvslmkjdkgbwfobmgmftpfufmmf{w`bpfalwkslpwvpfgnbgfkbmgkfqftkbwmbnfOjmhaoldpjyfabpfkfognbhfnbjmvpfq$*#(klogfmgptjwkMftpqfbgtfqfpjdmwbhfkbufdbnfpffm`boosbwktfoosovpnfmvejonsbqwiljmwkjpojpwdllgmffgtbzptfpwilapnjmgboploldlqj`kvpfpobpwwfbnbqnzellghjmdtjoofbpwtbqgafpwejqfSbdfhmltbtbz-smdnlufwkbmolbgdjufpfoemlwfnv`keffgnbmzql`hj`lmlm`follhkjgfgjfgKlnfqvofklpwbib{jmel`ovaobtpofppkboeplnfpv`kylmf233&lmfp`bqfWjnfqb`faovfelvqtffheb`fklsfdbufkbqgolpwtkfmsbqhhfswsbpppkjsqllnKWNOsobmWzsfglmfpbufhffseobdojmhplogejufwllhqbwfwltmivnswkvpgbqh`bqgejofefbqpwbzhjoowkbweboobvwlfufq-`lnwbohpklsulwfgffsnlgfqfpwwvqmalqmabmgefooqlpfvqo+phjmqlof`lnfb`wpbdfpnffwdlog-isdjwfnubqzefowwkfmpfmggqlsUjft`lsz2-3!?,b=pwlsfopfojfpwlvqsb`h-djesbpw`pp<dqbznfbm%dw8qjgfpklwobwfpbjgqlbgubq#effoilkmqj`hslqwebpw$VB.gfbg?,a=sllqajoowzsfV-P-tllgnvpw1s{8JmelqbmhtjgftbmwtbooofbgX3^8sbvotbufpvqf'+$ tbjwnbppbqnpdlfpdbjmobmdsbjg\"..#ol`hvmjwqllwtbohejqntjef{no!plmdwfpw13s{hjmgqltpwlloelmwnbjopbefpwbqnbsp`lqfqbjmeoltabazpsbmpbzp7s{85s{8bqwpellwqfbotjhjkfbwpwfswqjslqd,obhftfbhwlogElqn`bpwebmpabmhufqzqvmpivozwbph2s{8dlbodqftpoltfgdfjg>!pfwp6s{8-ip<73s{je#+pllmpfbwmlmfwvafyfqlpfmwqffgeb`wjmwldjewkbqn2;s{`bnfkjooalogyllnuljgfbpzqjmdejoosfbhjmjw`lpw0s{8ib`hwbdpajwpqloofgjwhmftmfbq?\"..dqltIPLMgvwzMbnfpbofzlv#olwpsbjmibyy`logfzfpejpkttt-qjphwbapsqfu23s{qjpf16s{Aovfgjmd033/abooelqgfbqmtjogal{-ebjqob`hufqpsbjqivmfwf`kje+\"sj`hfujo'+! tbqnolqgglfpsvoo/333jgfbgqbtkvdfpslwevmgavqmkqfe`foohfzpwj`hklvqolppevfo21s{pvjwgfboQPP!bdfgdqfzDFW!fbpfbjnpdjqobjgp;s{8mbuzdqjgwjsp :::tbqpobgz`bqp*8#~sks<kfoowbootklnyk9\t),\x0E\t#233kboo-\t\tB4s{8svpk`kbw3s{8`qft),?,kbpk46s{eobwqbqf#%%#wfoo`bnslmwlobjgnjppphjswfmwejmfnbofdfwpsolw733/\x0E\t\x0E\t`lloeffw-sks?aq=fqj`nlpwdvjgafoogfp`kbjqnbwkbwln,jnd% ;1ov`h`fmw3338wjmzdlmfkwnopfoogqvdEQFFmlgfmj`h<jg>olpfmvooubpwtjmgQPP#tfbqqfozaffmpbnfgvhfmbpb`bsftjpkdvoeW109kjwppolwdbwfhj`haovqwkfz26s{$$*8*8!=npjftjmpajqgplqwafwbpffhW2;9lqgpwqffnboo53s{ebqn\x0ElupalzpX3^-$*8!SLPWafbqhjgp*8~~nbqzwfmg+VH*rvbgyk9\n.pjy....sqls$*8\x0EojewW2:9uj`fbmgzgfaw=QPPsllomf`haoltW259gllqfuboW249ofwpebjolqbosloomlub`lopdfmf#\x0Elxplewqlnfwjooqlpp?k0=slvqebgfsjmh?wq=njmj*\x7F\"+njmfyk9\x04abqpkfbq33*8njoh#..=jqlmeqfggjphtfmwpljosvwp,ip,klozW119JPAMW139bgbnpffp?k1=iplm$/#$`lmwW129#QPPollsbpjbnllm?,s=plvoOJMFelqw`bqwW279?k2=;3s{\"..?:s{8W379njhf975Ymj`fjm`kZlqhqj`fyk9\b$**8svqfnbdfsbqbwlmfalmg904Y\\le\\$^*8333/yk9\x0Bwbmhzbqgaltoavpk965YIbub03s{\t\x7F~\t&@0&907YifeeF[SJ`bpkujpbdloepmltyk9\x05rvfq-`pppj`hnfbwnjm-ajmggfookjqfsj`pqfmw905YKWWS.132elwltloeFMG#{al{967YALGZgj`h8\t~\tf{jw906Yubqpafbw$~*8gjfw:::8bmmf~~?,Xj^-Obmdhn.^tjqfwlzpbggppfbobof{8\t\n~f`klmjmf-lqd336*wlmziftppbmgofdpqlle333*#133tjmfdfbqgldpallwdbqz`vwpwzofwfnswjlm-{no`l`hdbmd'+$-63s{Sk-Gnjp`bobmolbmgfphnjofqzbmvmj{gjp`*8~\tgvpw`ojs*-\t\t43s{.133GUGp4^=?wbsfgfnlj((*tbdffvqlskjolswpklofEBRpbpjm.15WobapsfwpVQO#avoh`llh8~\x0E\tKFBGX3^*baaqivbm+2:;ofpkwtjm?,j=plmzdvzpev`hsjsf\x7F.\t\"331*mgltX2^8X^8\tOld#pbow\x0E\t\n\nabmdwqjnabwk*x\x0E\t33s{\t~*8hl9\0effpbg=\x0Ep9,,#X^8wloosovd+*x\tx\x0E\t#-ip$133sgvboalbw-ISD*8\t~rvlw*8\t\t$*8\t\x0E\t~\x0E1327132613251324132;132:13131312131113101317131613151314131;131:130313021301130013071306130513041320132113221323133:133;133413351336133713301331133213332:::2::;2::42::52::62::72::02::12::22::32:;:2:;;2:;42:;52:;62:;72:;02:;12:;22:;32:4:2:4;2:442:452:462:472:402:412:422:432:5:2:5;2:542:552:562:572:502:512:522:532:6:2:6;2:642:652:662:672:602:612:622:632333231720:73333::::`lnln/Mpfpwffpwbsfqlwlglkb`f`bgbb/]lajfmg/Abbp/Aujgb`bpllwqlelqlplollwqb`vbogjilpjgldqbmwjslwfnbgfafbodlrv/Efpwlmbgbwqfpsl`l`bpbabilwlgbpjmlbdvbsvfpvmlpbmwfgj`fovjpfoobnbzlylmbbnlqsjpllaqb`oj`foolgjlpklqb`bpj<[<\\<Q<\\<R<P=l<\\=l=o=n<\\<Q<Y<S<R<R=n<T<[<Q<R<X<R=n<R<Z<Y<R<Q<T=i<q<\\<Y<Y<]=g<P=g<~=g=m<R<^=g<^<R<q<R<R<]<s<R<W<T<Q<T<L<H<q<Y<p=g=n=g<r<Q<T<P<X<\\<{<\\<x<\\<q=o<r<]=n<Y<t<[<Y<U<Q=o<P<P<N=g=o<Z5m5
setData(dictionaryData, dictionarySizeBits);
}
/**
* @constructor
* @param {!Int8Array} data
* @struct
*/
function InputStream(data) {
/** @type {!Int8Array} */
this.data = new Int8Array(0);
/** @type {number} */
this.offset = 0;
this.data = data;
}
/**
* @param {number} x
* @return {string}
*/
function valueOf(x) {
return x.toString();
}
/**
* @param {?InputStream} src
* @param {!Int8Array} dst
* @param {number} offset
* @param {number} length
* @return {number}
*/
function readInput(src, dst, offset, length) {
if (src === null) {
return -1;
}
let /** @type {number} */ end = Math.min(src.offset + length, src.data.length);
let /** @type {number} */ bytesRead = end - src.offset;
dst.set(src.data.subarray(src.offset, end), offset);
src.offset += bytesRead;
return bytesRead;
}
/**
* @param {string} src
* @return {!Int8Array}
*/
function toUsAsciiBytes(src) {
let /** @type {number} */ n = src.length;
let /** @type {!Int8Array} */ result = new Int8Array(n);
for (let /** @type {number} */ i = 0; i < n; ++i) {
result[i] = src.charCodeAt(i);
}
return result;
}
/* GENERATED CODE END */
/** @typedef {!Int8Array} */
let ByteBuffer;
/**
* @param {!Int8Array} bytes
* @param {?Options=} options
* @return {!Int8Array}
*/
function decode(bytes, options) {
let /** @type {!State} */ s = new State();
initState(s, new InputStream(bytes));
if (options) {
let customDictionary =
/** @type {?Int8Array} */ (options["customDictionary"]);
if (customDictionary) attachDictionaryChunk(s, customDictionary);
}
let /** @type {number} */ totalOutput = 0;
let /** @type {!Array<!Int8Array>} */ chunks = [];
while (true) {
let /** @type {!Int8Array} */ chunk = new Int8Array(16384);
chunks.push(chunk);
s.output = chunk;
s.outputOffset = 0;
s.outputLength = 16384;
s.outputUsed = 0;
decompress(s);
totalOutput += s.outputUsed;
if (s.outputUsed < 16384) break;
}
close(s);
let /** @type {!Int8Array} */ result = new Int8Array(totalOutput);
let /** @type {number} */ offset = 0;
for (let /** @type {number} */ i = 0; i < chunks.length; ++i) {
let /** @type {!Int8Array} */ chunk = chunks[i];
let /** @type {number} */ end = Math.min(totalOutput, offset + 16384);
let /** @type {number} */ len = end - offset;
if (len < 16384) {
result.set(chunk.subarray(0, len), offset);
} else {
result.set(chunk, offset);
}
offset += len;
}
return result;
}
return decode;
};
/**
* @type {function(!Int8Array, ?Options=):!Int8Array}
*/
export let BrotliDecode = makeBrotliDecode();
Reference in a new issue Copy permalink