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Viewing file:     BufferTokenizer.js (2.12 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BufferTokenizer = void 0;
const peek_readable_1 = require("peek-readable");
const AbstractTokenizer_1 = require("./AbstractTokenizer");
class BufferTokenizer extends AbstractTokenizer_1.AbstractTokenizer {
    /**
     * Construct BufferTokenizer
     * @param uint8Array - Uint8Array to tokenize
     * @param fileInfo - Pass additional file information to the tokenizer
     */
    constructor(uint8Array, fileInfo) {
        super(fileInfo);
        this.uint8Array = uint8Array;
        this.fileInfo.size = this.fileInfo.size ? this.fileInfo.size : uint8Array.length;
    }
    /**
     * Read buffer from tokenizer
     * @param uint8Array - Uint8Array to tokenize
     * @param options - Read behaviour options
     * @returns {Promise<number>}
     */
    async readBuffer(uint8Array, options) {
        if (options && options.position) {
            if (options.position < this.position) {
                throw new Error('`options.position` must be equal or greater than `tokenizer.position`');
            }
            this.position = options.position;
        }
        const bytesRead = await this.peekBuffer(uint8Array, options);
        this.position += bytesRead;
        return bytesRead;
    }
    /**
     * Peek (read ahead) buffer from tokenizer
     * @param uint8Array
     * @param options - Read behaviour options
     * @returns {Promise<number>}
     */
    async peekBuffer(uint8Array, options) {
        const normOptions = this.normalizeOptions(uint8Array, options);
        const bytes2read = Math.min(this.uint8Array.length - normOptions.position, normOptions.length);
        if ((!normOptions.mayBeLess) && bytes2read < normOptions.length) {
            throw new peek_readable_1.EndOfStreamError();
        }
        else {
            uint8Array.set(this.uint8Array.subarray(normOptions.position, normOptions.position + bytes2read), normOptions.offset);
            return bytes2read;
        }
    }
    async close() {
        // empty
    }
}
exports.BufferTokenizer = BufferTokenizer;