W250511/20.webpack/node_modules/@jsonjoy.com/buffers/lib/Reader.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Reader = void 0;
const decodeUtf8_1 = require("./utf8/decodeUtf8");
class Reader {
    constructor(uint8 = new Uint8Array([]), view = new DataView(uint8.buffer, uint8.byteOffset, uint8.length), x = 0, end = uint8.length) {
        this.uint8 = uint8;
        this.view = view;
        this.x = x;
        this.end = end;
    }
    reset(uint8) {
        this.x = 0;
        this.uint8 = uint8;
        this.view = new DataView(uint8.buffer, uint8.byteOffset, uint8.length);
    }
    size() {
        return this.end - this.x;
    }
    /**
     * Get current byte value without advancing the cursor.
     */
    peek() {
        return this.view.getUint8(this.x);
    }
    /**
     * @deprecated Use peek() instead.
     */
    peak() {
        return this.peek();
    }
    skip(length) {
        this.x += length;
    }
    buf(size = this.size()) {
        const x = this.x;
        const end = x + size;
        const bin = this.uint8.subarray(x, end);
        this.x = end;
        return bin;
    }
    subarray(start = 0, end) {
        const x = this.x;
        const actualStart = x + start;
        const actualEnd = typeof end === 'number' ? x + end : this.end;
        return this.uint8.subarray(actualStart, actualEnd);
    }
    /**
     * Creates a new {@link Reader} that references the same underlying memory
     * buffer. But with independent cursor and end.
     *
     * Preferred over {@link buf} since it also provides a DataView and is much
     * faster to allocate a new {@link Slice} than a new {@link Uint8Array}.
     *
     * @param start Start offset relative to the current cursor position.
     * @param end End offset relative to the current cursor position.
     * @returns A new {@link Reader} instance.
     */
    slice(start = 0, end) {
        const x = this.x;
        const actualStart = x + start;
        const actualEnd = typeof end === 'number' ? x + end : this.end;
        return new Reader(this.uint8, this.view, actualStart, actualEnd);
    }
    /**
     * Similar to {@link slice} but also advances the cursor. Returns a new
     * {@link Reader} that references the same underlying memory buffer, starting
     * from the current cursor position.
     *
     * @param size Number of bytes to cut from the current position.
     * @returns A new {@link Reader} instance.
     */
    cut(size = this.size()) {
        const slice = this.slice(0, size);
        this.skip(size);
        return slice;
    }
    u8() {
        return this.uint8[this.x++];
        // return this.view.getUint8(this.x++);
    }
    i8() {
        return this.view.getInt8(this.x++);
    }
    u16() {
        // const num = this.view.getUint16(this.x);
        // this.x += 2;
        // return num;
        let x = this.x;
        const num = (this.uint8[x++] << 8) + this.uint8[x++];
        this.x = x;
        return num;
    }
    i16() {
        const num = this.view.getInt16(this.x);
        this.x += 2;
        return num;
    }
    u32() {
        const num = this.view.getUint32(this.x);
        this.x += 4;
        return num;
    }
    i32() {
        const num = this.view.getInt32(this.x);
        this.x += 4;
        return num;
    }
    u64() {
        const num = this.view.getBigUint64(this.x);
        this.x += 8;
        return num;
    }
    i64() {
        const num = this.view.getBigInt64(this.x);
        this.x += 8;
        return num;
    }
    f32() {
        const pos = this.x;
        this.x += 4;
        return this.view.getFloat32(pos);
    }
    f64() {
        const pos = this.x;
        this.x += 8;
        return this.view.getFloat64(pos);
    }
    utf8(size) {
        const start = this.x;
        this.x += size;
        return (0, decodeUtf8_1.decodeUtf8)(this.uint8, start, size);
    }
    ascii(length) {
        const uint8 = this.uint8;
        let str = '';
        const end = this.x + length;
        for (let i = this.x; i < end; i++)
            str += String.fromCharCode(uint8[i]);
        this.x = end;
        return str;
    }
}
exports.Reader = Reader;
//# sourceMappingURL=Reader.js.map