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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| import { deserialize } from "./numpy"; | ||
| import type { InlineDecodeable, IntermediateMask } from "./types"; | ||
|
|
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| export default (inline: InlineDecodeable): IntermediateMask | null => { | ||
| let base64: string; | ||
| if (typeof inline === "string") { | ||
| base64 = inline; | ||
| } else if (typeof inline?.$binary?.base64 === "string") { | ||
| base64 = inline.$binary.base64; | ||
| } | ||
|
|
||
| if (!base64) { | ||
| return null; | ||
| } | ||
|
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| const data = deserialize(base64); | ||
| const [height, width] = data.shape; | ||
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|
||
| return { | ||
| data, | ||
| image: new ArrayBuffer(width * height * 4), | ||
| }; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /** | ||
| * Copyright 2017-2024, Voxel51, Inc. | ||
| */ | ||
|
|
||
| import { Buffer } from "buffer"; | ||
| import pako from "./pako.js"; | ||
| import type { OverlayMask } from "./types.js"; | ||
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|
||
| const DATA_TYPES = { | ||
| // < = little-endian, > = big-endian, | = host architecture | ||
| // we assume hosts are little-endian (like x86) so big-endian types are only | ||
| // supported for 8-bit integers, where endianness doesn't matter | ||
| "|b1": Uint8Array, | ||
| "<b1": Uint8Array, | ||
| ">b1": Uint8Array, | ||
| "|u1": Uint8Array, | ||
| "<u1": Uint8Array, | ||
| ">u1": Uint8Array, | ||
| "|i1": Int8Array, | ||
| "<i1": Int8Array, | ||
| ">i1": Int8Array, | ||
|
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| "|u2": Uint16Array, | ||
| "<u2": Uint16Array, | ||
| "|i2": Int16Array, | ||
| "<i2": Int16Array, | ||
|
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||
| "|u4": Uint32Array, | ||
| "<u4": Uint32Array, | ||
| "|i4": Int32Array, | ||
| "<i4": Int32Array, | ||
|
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| "|u8": BigUint64Array, | ||
| "<u8": BigUint64Array, | ||
| "|i8": BigInt64Array, | ||
| "<i8": BigInt64Array, | ||
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| "<f4": Float32Array, | ||
| "|f4": Float32Array, | ||
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| "<f8": Float64Array, | ||
| "|f8": Float64Array, | ||
| }; | ||
|
|
||
| /** | ||
| * Parses a uint16 (unsigned 16-bit integer) at a specified position in a | ||
| * Uint8Array | ||
| */ | ||
| function readUint16At(array: Uint8Array, index: number): number { | ||
| return array[index] + (array[index + 1] << 8); | ||
| } | ||
|
|
||
| /** | ||
| * Parses a string at a specified position in a Uint8Array | ||
| */ | ||
| function readStringAt(array: Uint8Array, start: number, end: number) { | ||
| return Array.from(array.slice(start, end)) | ||
| .map((c) => String.fromCharCode(c)) | ||
| .join(""); | ||
| } | ||
|
|
||
| /** | ||
| * Parses a saved numpy array | ||
| */ | ||
| function parse(array: Uint8Array): OverlayMask { | ||
| const version = readUint16At(array, 6); | ||
| if (version !== 1) { | ||
| throw new Error(`Unsupported version: ${version}`); | ||
| } | ||
| const headerLength = readUint16At(array, 8); | ||
| const bodyIndex = 10 + headerLength; | ||
| const header = JSON.parse( | ||
| readStringAt(array, 10, bodyIndex) | ||
| .replace(/'/g, '"') | ||
| .replace(/\(/g, "[") | ||
| .replace(/\)/g, "]") | ||
| .replace(/True|False/g, (s) => s.toLowerCase()) | ||
| .replace(/\s+/g, "") | ||
| .replace(/,}/, "}") | ||
| .replace(/,\]/, "]") | ||
| ); | ||
|
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| if (header.fortran_order) { | ||
| throw new Error(`Fortran order arrays are not supported"`); | ||
| } | ||
|
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| const ArrayType = DATA_TYPES[header.descr]; | ||
|
|
||
| if (!ArrayType) { | ||
| throw new Error(`Unsupported data type: "${header.descr}"`); | ||
| } | ||
| const rawData = array.slice(bodyIndex); | ||
|
|
||
| const typedData = | ||
| ArrayType === Uint8Array | ||
| ? rawData | ||
| : new ArrayType( | ||
| rawData.buffer, | ||
| rawData.byteOffset, | ||
| rawData.byteLength / ArrayType.BYTES_PER_ELEMENT | ||
| ); | ||
|
|
||
| return { | ||
| arrayType: typedData.constructor.name, | ||
| buffer: typedData.buffer, | ||
| channels: header.shape[2] ?? 1, | ||
| shape: [header.shape[0], header.shape[1]], | ||
| }; | ||
| } | ||
|
|
||
| /** | ||
| * Deserializes and parses a base64 encoded numpy array | ||
| */ | ||
| export function deserialize(compressedBase64Array: string): OverlayMask { | ||
| return parse(pako.inflate(Buffer.from(compressedBase64Array, "base64"))); | ||
| } |
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