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compression.js
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161 lines (140 loc) · 3.33 KB
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'use strict';
const {
ObjectDefineProperties,
SymbolToStringTag,
} = primordials;
const {
newReadableWritablePairFromDuplex,
} = require('internal/webstreams/adapters');
const { customInspect } = require('internal/webstreams/util');
const {
customInspectSymbol: kInspect,
kEnumerableProperty,
} = require('internal/util');
const { createEnumConverter } = require('internal/webidl');
let zlib;
function lazyZlib() {
zlib ??= require('zlib');
return zlib;
}
const formatConverter = createEnumConverter('CompressionFormat', [
'deflate',
'deflate-raw',
'gzip',
]);
/**
* @typedef {import('./readablestream').ReadableStream} ReadableStream
* @typedef {import('./writablestream').WritableStream} WritableStream
*/
class CompressionStream {
#handle;
#transform;
/**
* @param {'deflate'|'deflate-raw'|'gzip'} format
*/
constructor(format) {
format = formatConverter(format, {
prefix: "Failed to construct 'CompressionStream'",
context: '1st argument',
});
switch (format) {
case 'deflate':
this.#handle = lazyZlib().createDeflate();
break;
case 'deflate-raw':
this.#handle = lazyZlib().createDeflateRaw();
break;
case 'gzip':
this.#handle = lazyZlib().createGzip();
break;
}
this.#transform = newReadableWritablePairFromDuplex(this.#handle);
}
/**
* @readonly
* @type {ReadableStream}
*/
get readable() {
return this.#transform.readable;
}
/**
* @readonly
* @type {WritableStream}
*/
get writable() {
return this.#transform.writable;
}
[kInspect](depth, options) {
customInspect(depth, options, 'CompressionStream', {
readable: this.#transform.readable,
writable: this.#transform.writable,
});
}
}
class DecompressionStream {
#handle;
#transform;
/**
* @param {'deflate'|'deflate-raw'|'gzip'} format
*/
constructor(format) {
format = formatConverter(format, {
prefix: "Failed to construct 'DecompressionStream'",
context: '1st argument',
});
switch (format) {
case 'deflate':
this.#handle = lazyZlib().createInflate();
break;
case 'deflate-raw':
this.#handle = lazyZlib().createInflateRaw();
break;
case 'gzip':
this.#handle = lazyZlib().createGunzip();
break;
}
this.#transform = newReadableWritablePairFromDuplex(this.#handle);
}
/**
* @readonly
* @type {ReadableStream}
*/
get readable() {
return this.#transform.readable;
}
/**
* @readonly
* @type {WritableStream}
*/
get writable() {
return this.#transform.writable;
}
[kInspect](depth, options) {
customInspect(depth, options, 'DecompressionStream', {
readable: this.#transform.readable,
writable: this.#transform.writable,
});
}
}
ObjectDefineProperties(CompressionStream.prototype, {
readable: kEnumerableProperty,
writable: kEnumerableProperty,
[SymbolToStringTag]: {
__proto__: null,
configurable: true,
value: 'CompressionStream',
},
});
ObjectDefineProperties(DecompressionStream.prototype, {
readable: kEnumerableProperty,
writable: kEnumerableProperty,
[SymbolToStringTag]: {
__proto__: null,
configurable: true,
value: 'DecompressionStream',
},
});
module.exports = {
CompressionStream,
DecompressionStream,
};