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/*
* Wrappers over pako.
*
* Copyright (c) 2024 Jan Malakhovski <oxij@oxij.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// Deflate, and then return the compressed or the original imput,
// depending on which is smaller.
function deflateMaybe(input, options, errorHandler) {
try {
let compressed = pako.deflate(input, options);
if (compressed.byteLength < input.byteLength)
return compressed;
} catch (err) {
if (errorHandler !== undefined)
errorHandler(err);
else
throw err;
}
return input;
}
// Do the reverse to `deflateMaybe`, checking the input for the GZip header.
function inflateMaybe(input, options, errorHandler) {
if (input[0] === 31 && input[1] === 139 /* GZip header */) {
try {
return pako.inflate(input, options);
} catch (err) {
if (errorHandler !== undefined)
errorHandler(err);
else
throw err;
}
}
return input;
}
// `pako.Deflate` which does not fattern the compressed chunks and
// tracks the total size of the result.
class DeflateInChunks extends pako.Deflate {
constructor (options) {
super(options);
this.size = 0;
}
onData(chunk) {
this.chunks.push(chunk);
this.size += chunk.byteLength;
}
onEnd(status) {
this.err = status;
this.msg = this.strm.msg;
}
}
// deflateChunks : [Uint8Array] -> DeflateOptions -> [[Uint8Array], int, int]
function deflateChunks(inputChunks, options) {
const deflate = new DeflateInChunks(options);
let inputSize = 0;
for (let chunk of inputChunks) {
deflate.push(chunk, false);
inputSize += chunk.byteLength;
}
deflate.push(new Uint8Array([]), true);
if (deflate.err)
throw deflate.msg;
return [deflate.chunks, deflate.size, inputSize];
}
function deflateChunksMaybe(inputChunkss, options, errorHandler) {
try {
let [compressedChunks, compressedSize, inputSize] = deflateChunks(inputChunkss, options);
if (compressedSize < inputSize)
return compressedChunks;
} catch (err) {
if (errorHandler !== undefined)
errorHandler(err);
else
throw err;
}
return inputChunks;
}