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Viewing file:     BitReader.js (1.55 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BitReader = void 0;
const Token = require("token-types");
class BitReader {
    constructor(tokenizer) {
        this.tokenizer = tokenizer;
        this.pos = 0;
        this.dword = undefined;
    }
    /**
     *
     * @param bits 1..30 bits
     */
    async read(bits) {
        while (this.dword === undefined) {
            this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
        }
        let out = this.dword;
        this.pos += bits;
        if (this.pos < 32) {
            out >>>= (32 - this.pos);
            return out & ((1 << bits) - 1);
        }
        else {
            this.pos -= 32;
            if (this.pos === 0) {
                this.dword = undefined;
                return out & ((1 << bits) - 1);
            }
            else {
                this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
                if (this.pos) {
                    out <<= this.pos;
                    out |= this.dword >>> (32 - this.pos);
                }
                return out & ((1 << bits) - 1);
            }
        }
    }
    async ignore(bits) {
        if (this.pos > 0) {
            const remaining = 32 - this.pos;
            this.dword = undefined;
            bits -= remaining;
            this.pos = 0;
        }
        const remainder = bits % 32;
        const numOfWords = (bits - remainder) / 32;
        await this.tokenizer.ignore(numOfWords * 4);
        return this.read(remainder);
    }
}
exports.BitReader = BitReader;