32 lines
1.3 KiB
JavaScript
32 lines
1.3 KiB
JavaScript
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import { ENCRYPTED_REFERENCE_BYTES_LENGTH, ENCRYPTED_REFERENCE_HEX_LENGTH, REFERENCE_BYTES_LENGTH, REFERENCE_HEX_LENGTH } from "../types/index.js";
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import { bytesAtOffset, hasBytesAtOffset } from "./bytes.js";
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import { hexToBytes, makeHexString } from "./hex.js";
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export function makeBytesReference(reference, offset = 0) {
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if (typeof reference === 'string') {
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if (offset) {
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throw new Error('Offset property can be set only for UintArray reference!');
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}
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try {
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// Non-encrypted chunk hex string reference
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const hexReference = makeHexString(reference, REFERENCE_HEX_LENGTH);
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return hexToBytes(hexReference);
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} catch (e) {
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if (!(e instanceof TypeError)) {
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throw e;
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} // Encrypted chunk hex string reference
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const hexReference = makeHexString(reference, ENCRYPTED_REFERENCE_HEX_LENGTH);
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return hexToBytes(hexReference);
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}
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} else if (reference instanceof Uint8Array) {
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if (hasBytesAtOffset(reference, offset, ENCRYPTED_REFERENCE_BYTES_LENGTH)) {
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return bytesAtOffset(reference, offset, ENCRYPTED_REFERENCE_BYTES_LENGTH);
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} else if (hasBytesAtOffset(reference, offset, REFERENCE_BYTES_LENGTH)) {
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return bytesAtOffset(reference, offset, REFERENCE_BYTES_LENGTH);
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}
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}
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throw new TypeError('invalid chunk reference');
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}
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