@tomo-inc/ledger-bitcoin-babylon/build/main/lib/buffertools.js

Ledger Hardware Wallet Babylon Application Client

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BufferReader = exports.BufferWriter = exports.numberToLE = exports.unsafeFrom64bitLE = exports.unsafeTo64bitLE = void 0;
const varint_1 = require("./varint");
function unsafeTo64bitLE(n) {
    // we want to represent the input as a 8-bytes array
    if (n > Number.MAX_SAFE_INTEGER) {
        throw new Error("Can't convert numbers > MAX_SAFE_INT");
    }
    const byteArray = Buffer.alloc(8, 0);
    for (let index = 0; index < byteArray.length; index++) {
        const byte = n & 0xff;
        byteArray[index] = byte;
        n = (n - byte) / 256;
    }
    return byteArray;
}
exports.unsafeTo64bitLE = unsafeTo64bitLE;
function unsafeFrom64bitLE(byteArray) {
    let value = 0;
    if (byteArray.length != 8) {
        throw new Error('Expected Bufffer of lenght 8');
    }
    if (byteArray[7] != 0) {
        throw new Error("Can't encode numbers > MAX_SAFE_INT");
    }
    if (byteArray[6] > 0x1f) {
        throw new Error("Can't encode numbers > MAX_SAFE_INT");
    }
    for (let i = byteArray.length - 1; i >= 0; i--) {
        value = value * 256 + byteArray[i];
    }
    return value;
}
exports.unsafeFrom64bitLE = unsafeFrom64bitLE;
function numberToLE(value, byteLen = 32) {
    if (!Number.isInteger(value) || value < 0) {
        throw new RangeError('value must be a non-negative integer');
    }
    if (!Number.isInteger(byteLen) || byteLen < 1) {
        throw new RangeError('byteLen must be a positive integer');
    }
    const max = Math.pow(256, byteLen);
    if (value >= max) {
        throw new RangeError(`value too large to fit in ${byteLen} bytes (max ${max - 1})`);
    }
    const buf = Buffer.alloc(byteLen);
    let v = value;
    for (let i = 0; i < byteLen; i++) {
        buf[i] = v % 256;
        v = Math.floor(v / 256);
    }
    return buf;
}
exports.numberToLE = numberToLE;
class BufferWriter {
    constructor() {
        this.bufs = [];
    }
    write(alloc, fn) {
        const b = Buffer.alloc(alloc);
        fn(b);
        this.bufs.push(b);
    }
    writeUInt8(i) {
        this.write(1, (b) => b.writeUInt8(i, 0));
    }
    writeInt32(i) {
        this.write(4, (b) => b.writeInt32LE(i, 0));
    }
    writeUInt32(i) {
        this.write(4, (b) => b.writeUInt32LE(i, 0));
    }
    writeUInt64(i) {
        const bytes = unsafeTo64bitLE(i);
        this.writeSlice(bytes);
    }
    writeVarInt(i) {
        this.bufs.push((0, varint_1.createVarint)(i));
    }
    writeSlice(slice) {
        this.bufs.push(Buffer.from(slice));
    }
    writeVarSlice(slice) {
        this.writeVarInt(slice.length);
        this.writeSlice(slice);
    }
    buffer() {
        return Buffer.concat(this.bufs);
    }
}
exports.BufferWriter = BufferWriter;
class BufferReader {
    constructor(buffer, offset = 0) {
        this.buffer = buffer;
        this.offset = offset;
    }
    available() {
        return this.buffer.length - this.offset;
    }
    readUInt8() {
        const result = this.buffer.readUInt8(this.offset);
        this.offset++;
        return result;
    }
    readInt32() {
        const result = this.buffer.readInt32LE(this.offset);
        this.offset += 4;
        return result;
    }
    readUInt32() {
        const result = this.buffer.readUInt32LE(this.offset);
        this.offset += 4;
        return result;
    }
    readUInt64() {
        const buf = this.readSlice(8);
        return unsafeFrom64bitLE(buf);
    }
    readVarInt() {
        const [vi, vi_size] = (0, varint_1.parseVarint)(this.buffer, this.offset);
        this.offset += vi_size;
        return vi;
    }
    readSlice(n) {
        if (this.buffer.length < this.offset + n) {
            throw new Error('Cannot read slice out of bounds');
        }
        const result = this.buffer.slice(this.offset, this.offset + n);
        this.offset += n;
        return result;
    }
    readVarSlice() {
        const n = (0, varint_1.sanitizeBigintToNumber)(this.readVarInt());
        return this.readSlice(n);
    }
    readVector() {
        const count = this.readVarInt();
        const vector = [];
        for (let i = 0; i < count; i++)
            vector.push(this.readVarSlice());
        return vector;
    }
}
exports.BufferReader = BufferReader;
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