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Move the AsciiHexStream from src/core/stream.js and into its own file

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This commit is contained in:
Jonas Jenwald 2021-04-27 13:12:55 +02:00
parent 704514c7cd
commit d63df04854
3 changed files with 87 additions and 69 deletions
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86
src/core/ascii_hex_stream.js Normal file
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@ -0,0 +1,86 @@
/* Copyright 2012 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.
*/
/* eslint-disable no-var */
import { DecodeStream } from "./stream.js";
var AsciiHexStream = (function AsciiHexStreamClosure() {
// eslint-disable-next-line no-shadow
function AsciiHexStream(str, maybeLength) {
this.str = str;
this.dict = str.dict;
this.firstDigit = -1;
// Most streams increase in size when decoded, but AsciiHex streams shrink
// by 50%.
if (maybeLength) {
maybeLength = 0.5 * maybeLength;
}
DecodeStream.call(this, maybeLength);
}
AsciiHexStream.prototype = Object.create(DecodeStream.prototype);
AsciiHexStream.prototype.readBlock = function AsciiHexStream_readBlock() {
var UPSTREAM_BLOCK_SIZE = 8000;
var bytes = this.str.getBytes(UPSTREAM_BLOCK_SIZE);
if (!bytes.length) {
this.eof = true;
return;
}
var maxDecodeLength = (bytes.length + 1) >> 1;
var buffer = this.ensureBuffer(this.bufferLength + maxDecodeLength);
var bufferLength = this.bufferLength;
var firstDigit = this.firstDigit;
for (var i = 0, ii = bytes.length; i < ii; i++) {
var ch = bytes[i],
digit;
if (ch >= /* '0' = */ 0x30 && ch <= /* '9' = */ 0x39) {
digit = ch & 0x0f;
} else if (
(ch >= /* 'A' = */ 0x41 && ch <= /* 'Z' = */ 0x46) ||
(ch >= /* 'a' = */ 0x61 && ch <= /* 'z' = */ 0x66)
) {
digit = (ch & 0x0f) + 9;
} else if (ch === /* '>' = */ 0x3e) {
this.eof = true;
break;
} else {
// Probably whitespace, ignoring.
continue;
}
if (firstDigit < 0) {
firstDigit = digit;
} else {
buffer[bufferLength++] = (firstDigit << 4) | digit;
firstDigit = -1;
}
}
if (firstDigit >= 0 && this.eof) {
// incomplete byte
buffer[bufferLength++] = firstDigit << 4;
firstDigit = -1;
}
this.firstDigit = firstDigit;
this.bufferLength = bufferLength;
};
return AsciiHexStream;
})();
export { AsciiHexStream };

2
src/core/parser.js
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@ -15,7 +15,6 @@
import {
Ascii85Stream,
AsciiHexStream,
FlateStream,
NullStream,
PredictorStream,
@ -41,6 +40,7 @@ import {
Ref,
} from "./primitives.js";
import { isWhiteSpace, MissingDataException } from "./core_utils.js";
import { AsciiHexStream } from "./ascii_hex_stream.js";
import { CCITTFaxStream } from "./ccitt_stream.js";
import { Jbig2Stream } from "./jbig2_stream.js";
import { JpegStream } from "./jpeg_stream.js";

68
src/core/stream.js
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@ -1081,73 +1081,6 @@ var Ascii85Stream = (function Ascii85StreamClosure() {
return Ascii85Stream;
})();
var AsciiHexStream = (function AsciiHexStreamClosure() {
// eslint-disable-next-line no-shadow
function AsciiHexStream(str, maybeLength) {
this.str = str;
this.dict = str.dict;
this.firstDigit = -1;
// Most streams increase in size when decoded, but AsciiHex streams shrink
// by 50%.
if (maybeLength) {
maybeLength = 0.5 * maybeLength;
}
DecodeStream.call(this, maybeLength);
}
AsciiHexStream.prototype = Object.create(DecodeStream.prototype);
AsciiHexStream.prototype.readBlock = function AsciiHexStream_readBlock() {
var UPSTREAM_BLOCK_SIZE = 8000;
var bytes = this.str.getBytes(UPSTREAM_BLOCK_SIZE);
if (!bytes.length) {
this.eof = true;
return;
}
var maxDecodeLength = (bytes.length + 1) >> 1;
var buffer = this.ensureBuffer(this.bufferLength + maxDecodeLength);
var bufferLength = this.bufferLength;
var firstDigit = this.firstDigit;
for (var i = 0, ii = bytes.length; i < ii; i++) {
var ch = bytes[i],
digit;
if (ch >= /* '0' = */ 0x30 && ch <= /* '9' = */ 0x39) {
digit = ch & 0x0f;
} else if (
(ch >= /* 'A' = */ 0x41 && ch <= /* 'Z' = */ 0x46) ||
(ch >= /* 'a' = */ 0x61 && ch <= /* 'z' = */ 0x66)
) {
digit = (ch & 0x0f) + 9;
} else if (ch === /* '>' = */ 0x3e) {
this.eof = true;
break;
} else {
// Probably whitespace, ignoring.
continue;
}
if (firstDigit < 0) {
firstDigit = digit;
} else {
buffer[bufferLength++] = (firstDigit << 4) | digit;
firstDigit = -1;
}
}
if (firstDigit >= 0 && this.eof) {
// incomplete byte
buffer[bufferLength++] = firstDigit << 4;
firstDigit = -1;
}
this.firstDigit = firstDigit;
this.bufferLength = bufferLength;
};
return AsciiHexStream;
})();
var NullStream = (function NullStreamClosure() {
// eslint-disable-next-line no-shadow
function NullStream() {
@ -1161,7 +1094,6 @@ var NullStream = (function NullStreamClosure() {
export {
Ascii85Stream,
AsciiHexStream,
DecodeStream,
DecryptStream,
FlateStream,