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30 lines
1.2 KiB
30 lines
1.2 KiB
const registry = new Map();
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export function addDecoder(cases, importFn) {
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if (!Array.isArray(cases)) {
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cases = [cases]; // eslint-disable-line no-param-reassign
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}
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cases.forEach((c) => registry.set(c, importFn));
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}
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export async function getDecoder(fileDirectory) {
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const importFn = registry.get(fileDirectory.Compression);
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if (!importFn) {
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throw new Error(`Unknown compression method identifier: ${fileDirectory.Compression}`);
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}
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const Decoder = await importFn();
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return new Decoder(fileDirectory);
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}
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// Add default decoders to registry (end-user may override with other implementations)
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addDecoder([undefined, 1], () => import('./raw.js').then((m) => m.default));
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addDecoder(5, () => import('./lzw.js').then((m) => m.default));
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addDecoder(6, () => {
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throw new Error('old style JPEG compression is not supported.');
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});
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addDecoder(7, () => import('./jpeg.js').then((m) => m.default));
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addDecoder([8, 32946], () => import('./deflate.js').then((m) => m.default));
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addDecoder(32773, () => import('./packbits.js').then((m) => m.default));
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addDecoder(34887, () => import('./lerc.js').then((m) => m.default));
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addDecoder(50001, () => import('./webimage.js').then((m) => m.default));
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