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denoland-deno/ext/node/polyfills/_zlib_binding.mjs

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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// Copyright (c) 2014-2015 Devon Govett <devongovett@gmail.com>
// Forked from https://github.com/browserify/browserify-zlib
// deno-lint-ignore-file
import assert from "internal:deno_node/polyfills/assert.ts";
import { constants, zlib_deflate, zlib_inflate, Zstream } from "internal:deno_node/polyfills/_pako.mjs";
import { nextTick } from "internal:deno_node/polyfills/_next_tick.ts";
export const Z_NO_FLUSH = constants.Z_NO_FLUSH;
export const Z_PARTIAL_FLUSH = constants.Z_PARTIAL_FLUSH;
export const Z_SYNC_FLUSH = constants.Z_SYNC_FLUSH;
export const Z_FULL_FLUSH = constants.Z_FULL_FLUSH;
export const Z_FINISH = constants.Z_FINISH;
export const Z_BLOCK = constants.Z_BLOCK;
export const Z_TREES = constants.Z_TREES;
export const Z_OK = constants.Z_OK;
export const Z_STREAM_END = constants.Z_STREAM_END;
export const Z_NEED_DICT = constants.Z_NEED_DICT;
export const Z_ERRNO = constants.Z_ERRNO;
export const Z_STREAM_ERROR = constants.Z_STREAM_ERROR;
export const Z_DATA_ERROR = constants.Z_DATA_ERROR;
export const Z_MEM_ERROR = constants.Z_MEM_ERROR;
export const Z_BUF_ERROR = constants.Z_BUF_ERROR;
export const Z_VERSION_ERROR = constants.Z_VERSION_ERROR;
export const Z_NO_COMPRESSION = constants.Z_NO_COMPRESSION;
export const Z_BEST_SPEED = constants.Z_BEST_SPEED;
export const Z_BEST_COMPRESSION = constants.Z_BEST_COMPRESSION;
export const Z_DEFAULT_COMPRESSION = constants.Z_DEFAULT_COMPRESSION;
export const Z_FILTERED = constants.Z_FILTERED;
export const Z_HUFFMAN_ONLY = constants.Z_HUFFMAN_ONLYZ_FILTERED;
export const Z_RLE = constants.Z_RLE;
export const Z_FIXED = constants.Z_FIXED;
export const Z_DEFAULT_STRATEGY = constants.Z_DEFAULT_STRATEGY;
export const Z_BINARY = constants.Z_BINARY;
export const Z_TEXT = constants.Z_TEXT;
export const Z_UNKNOWN = constants.Z_UNKNOWN;
export const Z_DEFLATED = constants.Z_DEFLATED;
// zlib modes
export const NONE = 0;
export const DEFLATE = 1;
export const INFLATE = 2;
export const GZIP = 3;
export const GUNZIP = 4;
export const DEFLATERAW = 5;
export const INFLATERAW = 6;
export const UNZIP = 7;
var GZIP_HEADER_ID1 = 0x1f;
var GZIP_HEADER_ID2 = 0x8b;
/**
* Emulate Node's zlib C++ layer for use by the JS layer in index.js
*/
function Zlib(mode) {
if (typeof mode !== "number" || mode < DEFLATE || mode > UNZIP) {
throw new TypeError("Bad argument");
}
this.dictionary = null;
this.err = 0;
this.flush = 0;
this.init_done = false;
this.level = 0;
this.memLevel = 0;
this.mode = mode;
this.strategy = 0;
this.windowBits = 0;
this.write_in_progress = false;
this.pending_close = false;
this.gzip_id_bytes_read = 0;
}
Zlib.prototype.close = function () {
if (this.write_in_progress) {
this.pending_close = true;
return;
}
this.pending_close = false;
assert(this.init_done, "close before init");
assert(this.mode <= UNZIP);
if (this.mode === DEFLATE || this.mode === GZIP || this.mode === DEFLATERAW) {
zlib_deflate.deflateEnd(this.strm);
} else if (
this.mode === INFLATE || this.mode === GUNZIP || this.mode === INFLATERAW ||
this.mode === UNZIP
) {
zlib_inflate.inflateEnd(this.strm);
}
this.mode = NONE;
this.dictionary = null;
};
Zlib.prototype.write = function (
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
) {
return this._write(true, flush, input, in_off, in_len, out, out_off, out_len);
};
Zlib.prototype.writeSync = function (
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
) {
return this._write(
false,
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
);
};
Zlib.prototype._write = function (
async,
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
) {
assert.equal(arguments.length, 8);
assert(this.init_done, "write before init");
assert(this.mode !== NONE, "already finalized");
assert.equal(false, this.write_in_progress, "write already in progress");
assert.equal(false, this.pending_close, "close is pending");
this.write_in_progress = true;
assert.equal(false, flush === undefined, "must provide flush value");
this.write_in_progress = true;
if (
flush !== Z_NO_FLUSH && flush !== Z_PARTIAL_FLUSH &&
flush !== Z_SYNC_FLUSH && flush !== Z_FULL_FLUSH && flush !== Z_FINISH &&
flush !== Z_BLOCK
) {
throw new Error("Invalid flush value");
}
if (input == null) {
input = Buffer.alloc(0);
in_len = 0;
in_off = 0;
}
this.strm.avail_in = in_len;
this.strm.input = input;
this.strm.next_in = in_off;
this.strm.avail_out = out_len;
this.strm.output = out;
this.strm.next_out = out_off;
this.flush = flush;
if (!async) {
// sync version
this._process();
if (this._checkError()) {
return this._afterSync();
}
return;
}
// async version
var self = this;
nextTick(function () {
self._process();
self._after();
});
return this;
};
Zlib.prototype._afterSync = function () {
var avail_out = this.strm.avail_out;
var avail_in = this.strm.avail_in;
this.write_in_progress = false;
return [avail_in, avail_out];
};
Zlib.prototype._process = function () {
var next_expected_header_byte = null;
// If the avail_out is left at 0, then it means that it ran out
// of room. If there was avail_out left over, then it means
// that all of the input was consumed.
switch (this.mode) {
case DEFLATE:
case GZIP:
case DEFLATERAW:
this.err = zlib_deflate.deflate(this.strm, this.flush);
break;
case UNZIP:
if (this.strm.avail_in > 0) {
next_expected_header_byte = this.strm.next_in;
}
switch (this.gzip_id_bytes_read) {
case 0:
if (next_expected_header_byte === null) {
break;
}
if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID1) {
this.gzip_id_bytes_read = 1;
next_expected_header_byte++;
if (this.strm.avail_in === 1) {
// The only available byte was already read.
break;
}
} else {
this.mode = INFLATE;
break;
}
// fallthrough
case 1:
if (next_expected_header_byte === null) {
break;
}
if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID2) {
this.gzip_id_bytes_read = 2;
this.mode = GUNZIP;
} else {
// There is no actual difference between INFLATE and INFLATERAW
// (after initialization).
this.mode = INFLATE;
}
break;
default:
throw new Error("invalid number of gzip magic number bytes read");
}
// fallthrough
case INFLATE:
case GUNZIP:
case INFLATERAW:
this.err = zlib_inflate.inflate(this.strm, this.flush);
// If data was encoded with dictionary
if (this.err === Z_NEED_DICT && this.dictionary) {
// Load it
this.err = zlib_inflate.inflateSetDictionary(
this.strm,
this.dictionary,
);
if (this.err === Z_OK) {
// And try to decode again
this.err = zlib_inflate.inflate(this.strm, this.flush);
} else if (this.err === Z_DATA_ERROR) {
// Both inflateSetDictionary() and inflate() return Z_DATA_ERROR.
// Make it possible for After() to tell a bad dictionary from bad
// input.
this.err = Z_NEED_DICT;
}
}
while (
this.strm.avail_in > 0 && this.mode === GUNZIP &&
this.err === Z_STREAM_END && this.strm.next_in[0] !== 0x00
) {
// Bytes remain in input buffer. Perhaps this is another compressed
// member in the same archive, or just trailing garbage.
// Trailing zero bytes are okay, though, since they are frequently
// used for padding.
this.reset();
this.err = zlib_inflate.inflate(this.strm, this.flush);
}
break;
default:
throw new Error("Unknown mode " + this.mode);
}
};
Zlib.prototype._checkError = function () {
// Acceptable error states depend on the type of zlib stream.
switch (this.err) {
case Z_OK:
case Z_BUF_ERROR:
if (this.strm.avail_out !== 0 && this.flush === Z_FINISH) {
this._error("unexpected end of file");
return false;
}
break;
case Z_STREAM_END:
// normal statuses, not fatal
break;
case Z_NEED_DICT:
if (this.dictionary == null) {
this._error("Missing dictionary");
} else {
this._error("Bad dictionary");
}
return false;
default:
// something else.
this._error("Zlib error");
return false;
}
return true;
};
Zlib.prototype._after = function () {
if (!this._checkError()) {
return;
}
var avail_out = this.strm.avail_out;
var avail_in = this.strm.avail_in;
this.write_in_progress = false;
// call the write() cb
this.callback(avail_in, avail_out);
if (this.pending_close) {
this.close();
}
};
Zlib.prototype._error = function (message) {
if (this.strm.msg) {
message = this.strm.msg;
}
this.onerror(message, this.err);
// no hope of rescue.
this.write_in_progress = false;
if (this.pending_close) {
this.close();
}
};
Zlib.prototype.init = function (
windowBits,
level,
memLevel,
strategy,
dictionary,
) {
assert(
arguments.length === 4 || arguments.length === 5,
"init(windowBits, level, memLevel, strategy, [dictionary])",
);
assert(windowBits >= 8 && windowBits <= 15, "invalid windowBits");
assert(level >= -1 && level <= 9, "invalid compression level");
assert(memLevel >= 1 && memLevel <= 9, "invalid memlevel");
assert(
strategy === Z_FILTERED || strategy === Z_HUFFMAN_ONLY ||
strategy === Z_RLE || strategy === Z_FIXED ||
strategy === Z_DEFAULT_STRATEGY,
"invalid strategy",
);
this._init(level, windowBits, memLevel, strategy, dictionary);
this._setDictionary();
};
Zlib.prototype.params = function () {
throw new Error("deflateParams Not supported");
};
Zlib.prototype.reset = function () {
this._reset();
this._setDictionary();
};
Zlib.prototype._init = function (
level,
windowBits,
memLevel,
strategy,
dictionary,
) {
this.level = level;
this.windowBits = windowBits;
this.memLevel = memLevel;
this.strategy = strategy;
this.flush = Z_NO_FLUSH;
this.err = Z_OK;
if (this.mode === GZIP || this.mode === GUNZIP) {
this.windowBits += 16;
}
if (this.mode === UNZIP) {
this.windowBits += 32;
}
if (this.mode === DEFLATERAW || this.mode === INFLATERAW) {
this.windowBits = -1 * this.windowBits;
}
this.strm = new Zstream();
switch (this.mode) {
case DEFLATE:
case GZIP:
case DEFLATERAW:
this.err = zlib_deflate.deflateInit2(
this.strm,
this.level,
Z_DEFLATED,
this.windowBits,
this.memLevel,
this.strategy,
);
break;
case INFLATE:
case GUNZIP:
case INFLATERAW:
case UNZIP:
this.err = zlib_inflate.inflateInit2(this.strm, this.windowBits);
break;
default:
throw new Error("Unknown mode " + this.mode);
}
if (this.err !== Z_OK) {
this._error("Init error");
}
this.dictionary = dictionary;
this.write_in_progress = false;
this.init_done = true;
};
Zlib.prototype._setDictionary = function () {
if (this.dictionary == null) {
return;
}
this.err = Z_OK;
switch (this.mode) {
case DEFLATE:
case DEFLATERAW:
this.err = zlib_deflate.deflateSetDictionary(this.strm, this.dictionary);
break;
default:
break;
}
if (this.err !== Z_OK) {
this._error("Failed to set dictionary");
}
};
Zlib.prototype._reset = function () {
this.err = Z_OK;
switch (this.mode) {
case DEFLATE:
case DEFLATERAW:
case GZIP:
this.err = zlib_deflate.deflateReset(this.strm);
break;
case INFLATE:
case INFLATERAW:
case GUNZIP:
this.err = zlib_inflate.inflateReset(this.strm);
break;
default:
break;
}
if (this.err !== Z_OK) {
this._error("Failed to reset stream");
}
};
export { Zlib };