45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
import { JOSENotSupported, JWEInvalid } from '../util/errors.js';
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import { concat } from './buffer_utils.js';
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function supported(name) {
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if (typeof globalThis[name] === 'undefined') {
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throw new JOSENotSupported(`JWE "zip" (Compression Algorithm) Header Parameter requires the ${name} API.`);
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}
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}
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export async function compress(input) {
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supported('CompressionStream');
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const cs = new CompressionStream('deflate-raw');
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const writer = cs.writable.getWriter();
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writer.write(input).catch(() => { });
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writer.close().catch(() => { });
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const chunks = [];
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const reader = cs.readable.getReader();
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for (;;) {
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const { value, done } = await reader.read();
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if (done)
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break;
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chunks.push(value);
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}
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return concat(...chunks);
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}
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export async function decompress(input, maxLength) {
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supported('DecompressionStream');
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const ds = new DecompressionStream('deflate-raw');
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const writer = ds.writable.getWriter();
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writer.write(input).catch(() => { });
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writer.close().catch(() => { });
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const chunks = [];
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let length = 0;
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const reader = ds.readable.getReader();
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for (;;) {
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const { value, done } = await reader.read();
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if (done)
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break;
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chunks.push(value);
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length += value.byteLength;
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if (maxLength !== Infinity && length > maxLength) {
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throw new JWEInvalid('Decompressed plaintext exceeded the configured limit');
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}
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}
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return concat(...chunks);
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}
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