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Convert src/core/ascii_85_stream.js to use standard classes

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This commit is contained in:
Jonas Jenwald 2021-04-27 13:26:42 +02:00
parent f6c7a65202
commit cdb583b764
1 changed files with 10 additions and 15 deletions
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25
src/core/ascii_85_stream.js
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@ -16,24 +16,21 @@
import { DecodeStream } from "./stream.js"; import { DecodeStream } from "./stream.js";
import { isWhiteSpace } from "./core_utils.js"; import { isWhiteSpace } from "./core_utils.js";
const Ascii85Stream = (function Ascii85StreamClosure() { class Ascii85Stream extends DecodeStream {
// eslint-disable-next-line no-shadow constructor(str, maybeLength) {
function Ascii85Stream(str, maybeLength) {
this.str = str;
this.dict = str.dict;
this.input = new Uint8Array(5);
// Most streams increase in size when decoded, but Ascii85 streams // Most streams increase in size when decoded, but Ascii85 streams
// typically shrink by ~20%. // typically shrink by ~20%.
if (maybeLength) { if (maybeLength) {
maybeLength = 0.8 * maybeLength; maybeLength = 0.8 * maybeLength;
} }
DecodeStream.call(this, maybeLength); super(maybeLength);
this.str = str;
this.dict = str.dict;
this.input = new Uint8Array(5);
} }
Ascii85Stream.prototype = Object.create(DecodeStream.prototype); readBlock() {
Ascii85Stream.prototype.readBlock = function Ascii85Stream_readBlock() {
const TILDA_CHAR = 0x7e; // '~' const TILDA_CHAR = 0x7e; // '~'
const Z_LOWER_CHAR = 0x7a; // 'z' const Z_LOWER_CHAR = 0x7a; // 'z'
const EOF = -1; const EOF = -1;
@ -95,9 +92,7 @@ const Ascii85Stream = (function Ascii85StreamClosure() {
t >>= 8; t >>= 8;
} }
} }
}; }
}
return Ascii85Stream;
})();
export { Ascii85Stream }; export { Ascii85Stream };