Method _slideWindow

packages/alphatab/src/zip/DeflaterEngine.ts:505–526

()

    }

    private _slideWindow() {
        this._window.set(
            this._window.subarray(DeflaterConstants.wsize, DeflaterConstants.wsize + DeflaterConstants.wsize),
            0
        );
        this._matchStart -= DeflaterConstants.wsize;
        this._strstart -= DeflaterConstants.wsize;
        this._blockStart -= DeflaterConstants.wsize;

        // Slide the hash table (could be avoided with 32 bit values
        // at the expense of memory usage).
        for (let i = 0; i < DeflaterConstants.hashSize; ++i) {
            const m = this._head[i] & 0xffff;
            this._head[i] = m >= DeflaterConstants.wsize ? m - DeflaterConstants.wsize : 0;
        }

        // Slide the prev table.
        for (let i = 0; i < DeflaterConstants.wsize; i++) {
            const m = this._prev[i] & 0xffff;
            this._prev[i] = m >= DeflaterConstants.wsize ? m - DeflaterConstants.wsize : 0;
        }
    }
}