@libra-opensource/client-sdk-typescript
Version:
97 lines (96 loc) • 3.4 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BinaryDeserializer = void 0;
class BinaryDeserializer {
constructor(data) {
// As we can't be sure about the origin of the data, it's better to copy it to a new buffer
// e.g. if the data originated by: Buffer.from('16a9', 'hex'), the internal buffer would be much longer and/or different (as Buffer is some sort of a view)
this.buffer = new ArrayBuffer(data.length);
new Uint8Array(this.buffer).set(data, 0);
this.offset = 0;
}
read(length) {
const bytes = this.buffer.slice(this.offset, this.offset + length);
this.offset += length;
return bytes;
}
deserializeStr() {
const value = this.deserializeBytes();
return BinaryDeserializer.textDecoder.decode(value);
}
deserializeBytes() {
const len = this.deserializeLen();
if (len < 0) {
throw new Error("Length of a bytes array can't be negative");
}
return new Uint8Array(this.read(len));
}
deserializeBool() {
const bool = new Uint8Array(this.read(1))[0];
return bool == 1;
}
deserializeUnit() {
return;
}
deserializeU8() {
return new DataView(this.read(1)).getUint8(0);
}
deserializeU16() {
return new DataView(this.read(2)).getUint16(0, true);
}
deserializeU32() {
return new DataView(this.read(4)).getUint32(0, true);
}
deserializeU64() {
const low = this.deserializeU32();
const high = this.deserializeU32();
// combine the two 32-bit values and return (little endian)
return (BigInt(high) << BinaryDeserializer.BIG_32) | BigInt(low);
}
deserializeU128() {
const low = this.deserializeU64();
const high = this.deserializeU64();
// combine the two 64-bit values and return (little endian)
return (BigInt(high) << BinaryDeserializer.BIG_64) | BigInt(low);
}
deserializeI8() {
return new DataView(this.read(1)).getInt8(0);
}
deserializeI16() {
return new DataView(this.read(2)).getInt16(0, true);
}
deserializeI32() {
return new DataView(this.read(4)).getInt32(0, true);
}
deserializeI64() {
const low = this.deserializeI32();
const high = this.deserializeI32();
// combine the two 32-bit values and return (little endian)
return (BigInt(high) << BinaryDeserializer.BIG_32) | BigInt(low);
}
deserializeI128() {
const low = this.deserializeI64();
const high = this.deserializeI64();
// combine the two 64-bit values and return (little endian)
return (BigInt(high) << BinaryDeserializer.BIG_64) | BigInt(low);
}
deserializeOptionTag() {
return this.deserializeBool();
}
getBufferOffset() {
return this.offset;
}
deserializeChar() {
throw new Error('Method deserializeChar not implemented.');
}
deserializeF32() {
return new DataView(this.read(4)).getFloat32(0, true);
}
deserializeF64() {
return new DataView(this.read(8)).getFloat64(0, true);
}
}
exports.BinaryDeserializer = BinaryDeserializer;
BinaryDeserializer.BIG_32 = BigInt(32);
BinaryDeserializer.BIG_64 = BigInt(64);
BinaryDeserializer.textDecoder = new TextDecoder();