/**
|
* @licstart The following is the entire license notice for the
|
* JavaScript code in this page
|
*
|
* Copyright 2022 Mozilla Foundation
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*
|
* @licend The above is the entire license notice for the
|
* JavaScript code in this page
|
*/
|
"use strict";
|
|
Object.defineProperty(exports, "__esModule", {
|
value: true
|
});
|
exports.AsciiHexStream = void 0;
|
|
var _decode_stream = require("./decode_stream.js");
|
|
class AsciiHexStream extends _decode_stream.DecodeStream {
|
constructor(str, maybeLength) {
|
if (maybeLength) {
|
maybeLength *= 0.5;
|
}
|
|
super(maybeLength);
|
this.str = str;
|
this.dict = str.dict;
|
this.firstDigit = -1;
|
}
|
|
readBlock() {
|
const UPSTREAM_BLOCK_SIZE = 8000;
|
const bytes = this.str.getBytes(UPSTREAM_BLOCK_SIZE);
|
|
if (!bytes.length) {
|
this.eof = true;
|
return;
|
}
|
|
const maxDecodeLength = bytes.length + 1 >> 1;
|
const buffer = this.ensureBuffer(this.bufferLength + maxDecodeLength);
|
let bufferLength = this.bufferLength;
|
let firstDigit = this.firstDigit;
|
|
for (const ch of bytes) {
|
let digit;
|
|
if (ch >= 0x30 && ch <= 0x39) {
|
digit = ch & 0x0f;
|
} else if (ch >= 0x41 && ch <= 0x46 || ch >= 0x61 && ch <= 0x66) {
|
digit = (ch & 0x0f) + 9;
|
} else if (ch === 0x3e) {
|
this.eof = true;
|
break;
|
} else {
|
continue;
|
}
|
|
if (firstDigit < 0) {
|
firstDigit = digit;
|
} else {
|
buffer[bufferLength++] = firstDigit << 4 | digit;
|
firstDigit = -1;
|
}
|
}
|
|
if (firstDigit >= 0 && this.eof) {
|
buffer[bufferLength++] = firstDigit << 4;
|
firstDigit = -1;
|
}
|
|
this.firstDigit = firstDigit;
|
this.bufferLength = bufferLength;
|
}
|
|
}
|
|
exports.AsciiHexStream = AsciiHexStream;
|
