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feat: extra meta & filename & Content-Type support (#4)
* feat: contentType support for filename & Content-Type * feat: implement binary meta * feat: use new implementation * chore: lint * chore: comments * chore: update utils/lt-code/shared.ts --------- Co-authored-by: Anthony Fu <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| /** | ||
| * Merge multiple Uint8Array into a single Uint8Array | ||
| * Each chunk is prefixed with a 4-byte Uint32 to store the length of the chunk | ||
| */ | ||
| export function mergeUint8Arrays(arrays: Uint8Array[]) { | ||
| const totalLength = arrays.reduce((sum, arr) => sum + arr.length + 4, 0) // 4 是為了存每個數組的長度 (Uint32) | ||
|
|
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| const mergedArray = new Uint8Array(totalLength) | ||
| let offset = 0 | ||
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| arrays.forEach((arr) => { | ||
| const length = arr.length | ||
| // Store the length as a 4-byte Uint32 | ||
| mergedArray[offset++] = (length >> 24) & 0xFF | ||
| mergedArray[offset++] = (length >> 16) & 0xFF | ||
| mergedArray[offset++] = (length >> 8) & 0xFF | ||
| mergedArray[offset++] = length & 0xFF | ||
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| // Copy data | ||
| mergedArray.set(arr, offset) | ||
| offset += length | ||
| }) | ||
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| return mergedArray | ||
| } | ||
|
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| /** | ||
| * Split a merged Uint8Array into multiple Uint8Array | ||
| */ | ||
| export function splitUint8Arrays(mergedArray: Uint8Array): Uint8Array[] { | ||
| const arrays = [] | ||
| let offset = 0 | ||
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| while (offset < mergedArray.length) { | ||
| // Read chunk length | ||
| const length = (mergedArray[offset++]! << 24) | ||
| | (mergedArray[offset++]! << 16) | ||
| | (mergedArray[offset++]! << 8) | ||
| | mergedArray[offset++]! | ||
|
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| // Slice the chunk | ||
| const arr = mergedArray.slice(offset, offset + length) | ||
| arrays.push(arr) | ||
| offset += length | ||
| } | ||
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| return arrays | ||
| } | ||
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| export function appendMetaToBuffer<T>(data: Uint8Array, meta: T): Uint8Array { | ||
| const json = JSON.stringify(meta) | ||
| const metaBuffer = stringToUint8Array(json) | ||
| return mergeUint8Arrays([metaBuffer, data]) | ||
| } | ||
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| export function appendFileHeaderMetaToBuffer(data: Uint8Array, meta: { filename?: string, contentType?: string }): Uint8Array { | ||
| return appendMetaToBuffer(data, meta) | ||
| } | ||
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| export function readMetaFromBuffer<T>(buffer: Uint8Array): [data: Uint8Array, meta: T] { | ||
| const splitted = splitUint8Arrays(buffer) as [Uint8Array, Uint8Array] | ||
| if (splitted.length !== 2) { | ||
| throw new Error('Invalid buffer') | ||
| } | ||
|
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| const [metaBuffer, data] = splitted | ||
| const meta = JSON.parse(uint8ArrayToString(metaBuffer!)) | ||
| return [data, meta] | ||
| } | ||
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| export function readFileHeaderMetaFromBuffer(buffer: Uint8Array): [data: Uint8Array, meta: { filename?: string, contentType: string }] { | ||
| const [data, meta] = readMetaFromBuffer<{ filename?: string, contentType?: string }>(buffer) | ||
| if (!meta.contentType) { | ||
| meta.contentType = 'application/octet-stream' | ||
| } | ||
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| return [data, meta] as [Uint8Array, { filename?: string, contentType: string }] | ||
| } | ||
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| export function stringToUint8Array(str: string): Uint8Array { | ||
| const data = new Uint8Array(str.length) | ||
| for (let i = 0; i < str.length; i++) { | ||
| data[i] = str.charCodeAt(i) | ||
| } | ||
|
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| return data | ||
| } | ||
|
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| export function uint8ArrayToString(data: Uint8Array): string { | ||
| return String.fromCharCode(...data) | ||
| } |
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