@tsparticles/shape-image/esm/GifUtils/ByteStream.js

tsParticles image shape

export class ByteStream {
    constructor(bytes) {
        this.pos = 0;
        this.data = new Uint8ClampedArray(bytes);
    }
    getString(count) {
        const slice = this.data.slice(this.pos, this.pos + count);
        this.pos += slice.length;
        return slice.reduce((acc, curr) => acc + String.fromCharCode(curr), "");
    }
    nextByte() {
        return this.data[this.pos++];
    }
    nextTwoBytes() {
        const increment = 2, previous = 1, shift = 8;
        this.pos += increment;
        return this.data[this.pos - increment] + (this.data[this.pos - previous] << shift);
    }
    readSubBlocks() {
        let blockString = "", size = 0;
        const minCount = 0, emptySize = 0;
        do {
            size = this.data[this.pos++];
            for (let count = size; --count >= minCount; blockString += String.fromCharCode(this.data[this.pos++])) {
            }
        } while (size !== emptySize);
        return blockString;
    }
    readSubBlocksBin() {
        let size = this.data[this.pos], len = 0;
        const emptySize = 0, increment = 1;
        for (let offset = 0; size !== emptySize; offset += size + increment, size = this.data[this.pos + offset]) {
            len += size;
        }
        const blockData = new Uint8Array(len);
        size = this.data[this.pos++];
        for (let i = 0; size !== emptySize; size = this.data[this.pos++]) {
            for (let count = size; --count >= emptySize; blockData[i++] = this.data[this.pos++]) {
            }
        }
        return blockData;
    }
    skipSubBlocks() {
        for (const increment = 1, noData = 0; this.data[this.pos] !== noData; this.pos += this.data[this.pos] + increment) {
        }
        this.pos++;
    }
}