mirror of
https://github.com/mozilla/pdf.js.git
synced 2026-02-08 00:21:11 +01:00
bc87f4e8d6
For now it's just possible to create a single pdf in selecting some pages in different pdf sources. The merge is for now pretty basic (it's why it's still a WIP) none of these data are merged for now: - the struct trees - the page labels - the outlines - named destinations For there are 2 new ref tests where some new pdfs are created: one with some extracted pages and an other one (encrypted) which is just rewritten. The ref images are generated from the original pdfs in selecting the page we want and the new images are taken from the generated pdfs.
109 lines
2.3 KiB
JavaScript
109 lines
2.3 KiB
JavaScript
/* 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.
|
|
*/
|
|
|
|
import { BaseStream } from "./base_stream.js";
|
|
import { stringToBytes } from "../shared/util.js";
|
|
|
|
class Stream extends BaseStream {
|
|
constructor(arrayBuffer, start, length, dict) {
|
|
super();
|
|
|
|
this.bytes =
|
|
arrayBuffer instanceof Uint8Array
|
|
? arrayBuffer
|
|
: new Uint8Array(arrayBuffer);
|
|
this.start = start || 0;
|
|
this.pos = this.start;
|
|
this.end = start + length || this.bytes.length;
|
|
this.dict = dict;
|
|
}
|
|
|
|
get length() {
|
|
return this.end - this.start;
|
|
}
|
|
|
|
get isEmpty() {
|
|
return this.length === 0;
|
|
}
|
|
|
|
getByte() {
|
|
if (this.pos >= this.end) {
|
|
return -1;
|
|
}
|
|
return this.bytes[this.pos++];
|
|
}
|
|
|
|
getBytes(length) {
|
|
const bytes = this.bytes;
|
|
const pos = this.pos;
|
|
const strEnd = this.end;
|
|
|
|
if (!length) {
|
|
return bytes.subarray(pos, strEnd);
|
|
}
|
|
let end = pos + length;
|
|
if (end > strEnd) {
|
|
end = strEnd;
|
|
}
|
|
this.pos = end;
|
|
return bytes.subarray(pos, end);
|
|
}
|
|
|
|
getByteRange(begin, end) {
|
|
if (begin < 0) {
|
|
begin = 0;
|
|
}
|
|
if (end > this.end) {
|
|
end = this.end;
|
|
}
|
|
return this.bytes.subarray(begin, end);
|
|
}
|
|
|
|
reset() {
|
|
this.pos = this.start;
|
|
}
|
|
|
|
moveStart() {
|
|
this.start = this.pos;
|
|
}
|
|
|
|
makeSubStream(start, length, dict = null) {
|
|
return new Stream(this.bytes.buffer, start, length, dict);
|
|
}
|
|
|
|
clone() {
|
|
return new Stream(
|
|
this.bytes.buffer,
|
|
this.start,
|
|
this.end - this.start,
|
|
this.dict.clone()
|
|
);
|
|
}
|
|
}
|
|
|
|
class StringStream extends Stream {
|
|
constructor(str) {
|
|
super(stringToBytes(str));
|
|
}
|
|
}
|
|
|
|
class NullStream extends Stream {
|
|
constructor() {
|
|
super(new Uint8Array(0));
|
|
}
|
|
}
|
|
|
|
export { NullStream, Stream, StringStream };
|