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Viewing file:     input.js (2.99 KB)      -rw-r--r--

import { illegalArgs } from "@thi.ng/errors/illegal-arguments";
import { illegalState } from "@thi.ng/errors/illegal-state";
const U32 = Math.pow(2, 32);
export class BitInputStream {
    buffer;
    start;
    limit;
    pos;
    bitPos;
    bit;
    constructor(buffer, offset = 0, limit = buffer.length << 3) {
        this.buffer = buffer;
        this.start = offset;
        this.limit = limit;
        this.seek(offset);
    }
    *[Symbol.iterator]() {
        let j = this.start;
        let i = j >>> 3;
        let b = 7 - (j & 0x7);
        while (j < this.limit) {
            yield (this.buffer[i] >>> b) & 1;
            if (--b < 0) {
                i++;
                b = 7;
            }
            j++;
        }
    }
    get length() {
        return this.limit;
    }
    get position() {
        return this.bitPos;
    }
    seek(pos) {
        if (pos < this.start || pos >= this.limit) {
            illegalArgs(`seek pos out of bounds: ${pos}`);
        }
        this.pos = pos >>> 3;
        this.bit = 8 - (pos & 0x7);
        this.bitPos = pos;
        return this;
    }
    read(wordSize = 1) {
        if (wordSize > 32) {
            return this.read(wordSize - 32) * U32 + this.read(32);
        }
        else if (wordSize > 8) {
            let out = 0;
            let n = wordSize & -8;
            let msb = wordSize - n;
            if (msb > 0) {
                out = this._read(msb);
            }
            while (n > 0) {
                out = ((out << 8) | this._read(8)) >>> 0;
                n -= 8;
            }
            return out;
        }
        else {
            return this._read(wordSize);
        }
    }
    readFields(fields) {
        return fields.map((word) => this.read(word));
    }
    readWords(n, wordSize = 8) {
        let out = [];
        while (n-- > 0) {
            out.push(this.read(wordSize));
        }
        return out;
    }
    readStruct(fields) {
        return fields.reduce((acc, [id, word]) => {
            return (acc[id] = this.read(word)), acc;
        }, {});
    }
    readBit() {
        this.checkLimit(1);
        this.bit--;
        this.bitPos++;
        let out = (this.buffer[this.pos] >>> this.bit) & 1;
        if (this.bit === 0) {
            this.pos++;
            this.bit = 8;
        }
        return out;
    }
    _read(wordSize) {
        this.checkLimit(wordSize);
        let l = this.bit - wordSize, out;
        if (l >= 0) {
            this.bit = l;
            out = (this.buffer[this.pos] >>> l) & ((1 << wordSize) - 1);
            if (l === 0) {
                this.pos++;
                this.bit = 8;
            }
        }
        else {
            out = (this.buffer[this.pos++] & ((1 << this.bit) - 1)) << -l;
            this.bit = 8 + l;
            out = out | (this.buffer[this.pos] >>> this.bit);
        }
        this.bitPos += wordSize;
        return out;
    }
    checkLimit(requested) {
        if (this.bitPos + requested > this.limit) {
            illegalState(`can't read past EOF`);
        }
    }
}