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Convert src/core/flate_stream.js to use standard classes

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This commit is contained in:
Jonas Jenwald 2021-04-27 13:53:36 +02:00
parent aa1deaf93c
commit 213e1c389c
1 changed files with 105 additions and 112 deletions
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63
src/core/flate_stream.js
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@ -22,30 +22,29 @@
import { DecodeStream } from "./stream.js";
import { FormatError } from "../shared/util.js";
const FlateStream = (function FlateStreamClosure() {
// prettier-ignore
const codeLenCodeMap = new Int32Array([
// prettier-ignore
const codeLenCodeMap = new Int32Array([
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
]);
]);
// prettier-ignore
const lengthDecode = new Int32Array([
// prettier-ignore
const lengthDecode = new Int32Array([
0x00003, 0x00004, 0x00005, 0x00006, 0x00007, 0x00008, 0x00009, 0x0000a,
0x1000b, 0x1000d, 0x1000f, 0x10011, 0x20013, 0x20017, 0x2001b, 0x2001f,
0x30023, 0x3002b, 0x30033, 0x3003b, 0x40043, 0x40053, 0x40063, 0x40073,
0x50083, 0x500a3, 0x500c3, 0x500e3, 0x00102, 0x00102, 0x00102
]);
]);
// prettier-ignore
const distDecode = new Int32Array([
// prettier-ignore
const distDecode = new Int32Array([
0x00001, 0x00002, 0x00003, 0x00004, 0x10005, 0x10007, 0x20009, 0x2000d,
0x30011, 0x30019, 0x40021, 0x40031, 0x50041, 0x50061, 0x60081, 0x600c1,
0x70101, 0x70181, 0x80201, 0x80301, 0x90401, 0x90601, 0xa0801, 0xa0c01,
0xb1001, 0xb1801, 0xc2001, 0xc3001, 0xd4001, 0xd6001
]);
]);
// prettier-ignore
const fixedLitCodeTab = [new Int32Array([
// prettier-ignore
const fixedLitCodeTab = [new Int32Array([
0x70100, 0x80050, 0x80010, 0x80118, 0x70110, 0x80070, 0x80030, 0x900c0,
0x70108, 0x80060, 0x80020, 0x900a0, 0x80000, 0x80080, 0x80040, 0x900e0,
0x70104, 0x80058, 0x80018, 0x90090, 0x70114, 0x80078, 0x80038, 0x900d0,
@ -110,18 +109,20 @@ const FlateStream = (function FlateStreamClosure() {
0x7010b, 0x80067, 0x80027, 0x900af, 0x80007, 0x80087, 0x80047, 0x900ef,
0x70107, 0x8005f, 0x8001f, 0x9009f, 0x70117, 0x8007f, 0x8003f, 0x900df,
0x7010f, 0x8006f, 0x8002f, 0x900bf, 0x8000f, 0x8008f, 0x8004f, 0x900ff
]), 9];
]), 9];
// prettier-ignore
const fixedDistCodeTab = [new Int32Array([
// prettier-ignore
const fixedDistCodeTab = [new Int32Array([
0x50000, 0x50010, 0x50008, 0x50018, 0x50004, 0x50014, 0x5000c, 0x5001c,
0x50002, 0x50012, 0x5000a, 0x5001a, 0x50006, 0x50016, 0x5000e, 0x00000,
0x50001, 0x50011, 0x50009, 0x50019, 0x50005, 0x50015, 0x5000d, 0x5001d,
0x50003, 0x50013, 0x5000b, 0x5001b, 0x50007, 0x50017, 0x5000f, 0x00000
]), 5];
]), 5];
class FlateStream extends DecodeStream {
constructor(str, maybeLength) {
super(maybeLength);
// eslint-disable-next-line no-shadow
function FlateStream(str, maybeLength) {
this.str = str;
this.dict = str.dict;
@ -144,13 +145,9 @@ const FlateStream = (function FlateStreamClosure() {
this.codeSize = 0;
this.codeBuf = 0;
DecodeStream.call(this, maybeLength);
}
FlateStream.prototype = Object.create(DecodeStream.prototype);
FlateStream.prototype.getBits = function FlateStream_getBits(bits) {
getBits(bits) {
const str = this.str;
let codeSize = this.codeSize;
let codeBuf = this.codeBuf;
@ -168,9 +165,9 @@ const FlateStream = (function FlateStreamClosure() {
this.codeSize = codeSize -= bits;
return b;
};
}
FlateStream.prototype.getCode = function FlateStream_getCode(table) {
getCode(table) {
const str = this.str;
const codes = table[0];
const maxLen = table[1];
@ -196,11 +193,9 @@ const FlateStream = (function FlateStreamClosure() {
this.codeBuf = codeBuf >> codeLen;
this.codeSize = codeSize - codeLen;
return codeVal;
};
}
FlateStream.prototype.generateHuffmanTable = function flateStreamGenerateHuffmanTable(
lengths
) {
generateHuffmanTable(lengths) {
const n = lengths.length;
// find max code length
@ -240,9 +235,9 @@ const FlateStream = (function FlateStreamClosure() {
}
return [codes, maxLen];
};
}
FlateStream.prototype.readBlock = function FlateStream_readBlock() {
readBlock() {
let buffer, len;
const str = this.str;
// read block header
@ -400,9 +395,7 @@ const FlateStream = (function FlateStreamClosure() {
buffer[pos] = buffer[pos - dist];
}
}
};
return FlateStream;
})();
}
}
export { FlateStream };