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core.ts
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core.ts
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import {
type ReadResult,
type ReaderOptions,
type WriterOptions,
type ZXingBinarizer,
type ZXingCharacterSet,
type ZXingContentType,
type ZXingEanAddOnSymbol,
type ZXingReadResult,
type ZXingReaderOptions,
type ZXingTextMode,
type ZXingVector,
type ZXingWriteResult,
type ZXingWriterOptions,
defaultReaderOptions,
defaultWriterOptions,
readerOptionsToZXingReaderOptions,
writerOptionsToZXingWriterOptions,
zxingReadResultToReadResult,
zxingWriteResultToWriteResult,
} from "./bindings/index.js";
export type ZXingModuleType = "reader" | "writer" | "full";
interface ZXingBaseModule extends EmscriptenModule {
CharacterSet: ZXingCharacterSet;
}
/**
* @internal
*/
export interface ZXingReaderModule extends ZXingBaseModule {
Binarizer: ZXingBinarizer;
ContentType: ZXingContentType;
EanAddOnSymbol: ZXingEanAddOnSymbol;
TextMode: ZXingTextMode;
readBarcodesFromImage(
bufferPtr: number,
bufferLength: number,
zxingReaderOptions: ZXingReaderOptions,
): ZXingVector<ZXingReadResult>;
readBarcodesFromPixmap(
bufferPtr: number,
imgWidth: number,
imgHeight: number,
zxingReaderOptions: ZXingReaderOptions,
): ZXingVector<ZXingReadResult>;
}
/**
* @internal
*/
export interface ZXingWriterModule extends ZXingBaseModule {
writeBarcodeToImage(
text: string,
zxingWriterOptions: ZXingWriterOptions,
): ZXingWriteResult;
}
/**
* @internal
*/
export interface ZXingFullModule extends ZXingReaderModule, ZXingWriterModule {}
export type ZXingModule<T extends ZXingModuleType = ZXingModuleType> =
T extends "reader"
? ZXingReaderModule
: T extends "writer"
? ZXingWriterModule
: T extends "full"
? ZXingFullModule
: ZXingReaderModule | ZXingWriterModule | ZXingFullModule;
export type ZXingReaderModuleFactory =
EmscriptenModuleFactory<ZXingReaderModule>;
export type ZXingWriterModuleFactory =
EmscriptenModuleFactory<ZXingWriterModule>;
export type ZXingFullModuleFactory = EmscriptenModuleFactory<ZXingFullModule>;
export type ZXingModuleFactory<T extends ZXingModuleType = ZXingModuleType> =
T extends "reader"
? ZXingReaderModuleFactory
: T extends "writer"
? ZXingWriterModuleFactory
: T extends "full"
? ZXingFullModuleFactory
:
| ZXingReaderModuleFactory
| ZXingWriterModuleFactory
| ZXingFullModuleFactory;
export type ZXingModuleOverrides = Partial<EmscriptenModule>;
const defaultModuleOverrides: ZXingModuleOverrides = import.meta.env.PROD
? {
locateFile: (path, prefix) => {
const match = path.match(/_(.+?)\.wasm$/);
if (match) {
return `https://fastly.jsdelivr.net/npm/zxing-wasm@${NPM_PACKAGE_VERSION}/dist/${match[1]}/${path}`;
}
return prefix + path;
},
}
: {
locateFile: (path, prefix) => {
const match = path.match(/_(.+?)\.wasm$/);
if (match) {
return `/src/${match[1]}/${path}`;
}
return prefix + path;
},
};
interface ZXingWeakMapValue<T extends ZXingModuleType = ZXingModuleType> {
moduleOverrides: ZXingModuleOverrides;
modulePromise?: Promise<ZXingModule<T>>;
}
type ZXingWeakMap = WeakMap<ZXingModuleFactory, ZXingWeakMapValue>;
let zxingWeakMap: ZXingWeakMap = new WeakMap();
export function getZXingModuleWithFactory<T extends ZXingModuleType>(
zxingModuleFactory: ZXingModuleFactory<T>,
zxingModuleOverrides?: ZXingModuleOverrides,
): Promise<ZXingModule<T>> {
const zxingWeakMapValue = zxingWeakMap.get(zxingModuleFactory) as
| ZXingWeakMapValue<T>
| undefined;
if (
zxingWeakMapValue?.modulePromise &&
(zxingModuleOverrides === undefined ||
Object.is(zxingModuleOverrides, zxingWeakMapValue.moduleOverrides))
) {
return zxingWeakMapValue.modulePromise;
}
const resolvedModuleOverrides =
zxingModuleOverrides ??
zxingWeakMapValue?.moduleOverrides ??
defaultModuleOverrides;
const modulePromise = zxingModuleFactory({
...resolvedModuleOverrides,
}) as Promise<ZXingModule<T>>;
zxingWeakMap.set(zxingModuleFactory, {
moduleOverrides: resolvedModuleOverrides,
modulePromise,
});
return modulePromise;
}
export function purgeZXingModule() {
zxingWeakMap = new WeakMap();
}
export function setZXingModuleOverridesWithFactory<T extends ZXingModuleType>(
zxingModuleFactory: ZXingModuleFactory<T>,
zxingModuleOverrides: ZXingModuleOverrides,
) {
zxingWeakMap.set(zxingModuleFactory, {
moduleOverrides: zxingModuleOverrides,
});
}
export async function readBarcodesFromImageFileWithFactory<
T extends "reader" | "full",
>(
zxingModuleFactory: ZXingModuleFactory<T>,
imageFile: Blob,
readerOptions: ReaderOptions = defaultReaderOptions,
) {
const requiredReaderOptions: Required<ReaderOptions> = {
...defaultReaderOptions,
...readerOptions,
};
const zxingModule = await getZXingModuleWithFactory(zxingModuleFactory);
const { size } = imageFile;
const buffer = new Uint8Array(await imageFile.arrayBuffer());
const bufferPtr = zxingModule._malloc(size);
zxingModule.HEAPU8.set(buffer, bufferPtr);
const zxingReadResultVector = zxingModule.readBarcodesFromImage(
bufferPtr,
size,
readerOptionsToZXingReaderOptions(zxingModule, requiredReaderOptions),
);
zxingModule._free(bufferPtr);
const readResults: ReadResult[] = [];
for (let i = 0; i < zxingReadResultVector.size(); ++i) {
readResults.push(
zxingReadResultToReadResult(zxingReadResultVector.get(i)!),
);
}
return readResults;
}
export async function readBarcodesFromImageDataWithFactory<
T extends "reader" | "full",
>(
zxingModuleFactory: ZXingModuleFactory<T>,
imageData: ImageData,
readerOptions: ReaderOptions = defaultReaderOptions,
) {
const requiredReaderOptions: Required<ReaderOptions> = {
...defaultReaderOptions,
...readerOptions,
};
const zxingModule = await getZXingModuleWithFactory(zxingModuleFactory);
const {
data: buffer,
width,
height,
data: { byteLength: size },
} = imageData;
const bufferPtr = zxingModule._malloc(size);
zxingModule.HEAPU8.set(buffer, bufferPtr);
const zxingReadResultVector = zxingModule.readBarcodesFromPixmap(
bufferPtr,
width,
height,
readerOptionsToZXingReaderOptions(zxingModule, requiredReaderOptions),
);
zxingModule._free(bufferPtr);
const readResults: ReadResult[] = [];
for (let i = 0; i < zxingReadResultVector.size(); ++i) {
readResults.push(
zxingReadResultToReadResult(zxingReadResultVector.get(i)!),
);
}
return readResults;
}
export async function writeBarcodeToImageFileWithFactory<
T extends "writer" | "full",
>(
zxingModuleFactory: ZXingModuleFactory<T>,
text: string,
writerOptions: WriterOptions = defaultWriterOptions,
) {
const requiredWriterOptions: Required<WriterOptions> = {
...defaultWriterOptions,
...writerOptions,
};
const zxingModule = await getZXingModuleWithFactory(zxingModuleFactory);
const zxingWriteResult = zxingModule.writeBarcodeToImage(
text,
writerOptionsToZXingWriterOptions(zxingModule, requiredWriterOptions),
);
return zxingWriteResultToWriteResult(zxingWriteResult);
}