@loaders.gl/loader-utils
Version:
Framework-independent loaders for 3D graphics formats
64 lines (63 loc) • 2.38 kB
JavaScript
/**
* Checks if bigint can be converted to number and convert it if possible
* @param bigint bigint to be converted
* @returns number
*/
const toNumber = (bigint) => {
if (bigint > Number.MAX_SAFE_INTEGER) {
throw new Error('Offset is out of bounds');
}
return Number(bigint);
};
/**
* Provides file data using DataView
* @deprecated - will be replaced with ReadableFile
*/
export class DataViewFile {
/** The DataView from which data is provided */
file;
constructor(file) {
this.file = file;
}
async destroy() { }
/**
* Gets an unsigned 8-bit integer at the specified byte offset from the start of the file.
* @param offset The offset, in bytes, from the start of the file where to read the data.
*/
async getUint8(offset) {
return this.file.getUint8(toNumber(offset));
}
/**
* Gets an unsigned 16-bit intege at the specified byte offset from the start of the file.
* @param offset The offset, in bytes, from the start of the file where to read the data.
*/
async getUint16(offset) {
return this.file.getUint16(toNumber(offset), true);
}
/**
* Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
* @param offset The offset, in bytes, from the start of the file where to read the data.
*/
async getUint32(offset) {
return this.file.getUint32(toNumber(offset), true);
}
/**
* Gets an unsigned 64-bit integer at the specified byte offset from the start of the file.
* @param offset The offset, in bytes, from the start of the file where to read the data.
*/
async getBigUint64(offset) {
return this.file.getBigUint64(toNumber(offset), true);
}
/**
* returns an ArrayBuffer whose contents are a copy of this file bytes from startOffset, inclusive, up to endOffset, exclusive.
* @param startOffset The offset, in bytes, from the start of the file where to start reading the data.
* @param endOffset The offset, in bytes, from the start of the file where to end reading the data.
*/
async slice(startOffset, endOffset) {
return this.file.buffer.slice(toNumber(startOffset), toNumber(endOffset));
}
/** the length (in bytes) of the data. */
get length() {
return BigInt(this.file.byteLength);
}
}