@neo-one/node-core/utils/BinaryReader.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const client_common_1 = require("@neo-one/client-common");
const bn_js_1 = require("bn.js");
const lodash_1 = tslib_1.__importDefault(require("lodash"));
class BinaryReader {
    constructor(buffer, index = 0) {
        this.buffer = buffer;
        this.mutableIndex = index;
    }
    get index() {
        return this.mutableIndex;
    }
    get remaining() {
        return this.buffer.length - this.mutableIndex;
    }
    get remainingBuffer() {
        return this.buffer.slice(this.mutableIndex);
    }
    hasMore() {
        return this.mutableIndex < this.buffer.byteLength;
    }
    clone() {
        return new BinaryReader(this.buffer, this.mutableIndex);
    }
    readBytes(numBytes) {
        this.checkRead(numBytes);
        const result = this.buffer.slice(this.mutableIndex, this.mutableIndex + numBytes);
        this.mutableIndex += numBytes;
        return result;
    }
    readInt8() {
        this.checkRead(1);
        const result = this.buffer.readInt8(this.mutableIndex);
        this.mutableIndex += 1;
        return result;
    }
    readUInt8() {
        this.checkRead(1);
        const result = this.buffer.readUInt8(this.mutableIndex);
        this.mutableIndex += 1;
        return result;
    }
    readBoolean() {
        return this.readBytes(1)[0] !== 0;
    }
    readInt16LE() {
        this.checkRead(2);
        const result = this.buffer.readInt16LE(this.mutableIndex);
        this.mutableIndex += 2;
        return result;
    }
    readUInt16LE() {
        this.checkRead(2);
        const result = this.buffer.readUInt16LE(this.mutableIndex);
        this.mutableIndex += 2;
        return result;
    }
    readUInt16BE() {
        this.checkRead(2);
        const result = this.buffer.readUInt16BE(this.mutableIndex);
        this.mutableIndex += 2;
        return result;
    }
    readInt32LE() {
        this.checkRead(4);
        const result = this.buffer.readInt32LE(this.mutableIndex);
        this.mutableIndex += 4;
        return result;
    }
    readUInt32LE() {
        this.checkRead(4);
        const result = this.buffer.readUInt32LE(this.mutableIndex);
        this.mutableIndex += 4;
        return result;
    }
    readUInt64LE() {
        return new bn_js_1.BN(this.readBytes(8), 'le');
    }
    readInt64LE() {
        const buffer = this.readBytes(8);
        return new bn_js_1.BN(buffer, 'le').fromTwos(buffer.length * 8);
    }
    readUInt160() {
        return client_common_1.common.bufferToUInt160(this.readBytes(client_common_1.common.UINT160_BUFFER_BYTES));
    }
    readUInt256() {
        return client_common_1.common.bufferToUInt256(this.readBytes(client_common_1.common.UINT256_BUFFER_BYTES));
    }
    readFixed8() {
        return this.readInt64LE();
    }
    readFixedString(length) {
        const values = lodash_1.default.takeWhile([...this.readBytes(length)], (value) => value !== 0);
        return Buffer.from(values).toString('utf8');
    }
    readArray(read, max = 0x1000000) {
        const count = this.readVarUIntLE(new bn_js_1.BN(max)).toNumber();
        return lodash_1.default.range(count).map(read);
    }
    readObject(read, max = 0x1000000) {
        const count = this.readVarUIntLE(new bn_js_1.BN(max)).toNumber();
        return lodash_1.default.range(count).reduce((acc) => {
            const { key, value } = read();
            return Object.assign({}, acc, { [key]: value });
        }, {});
    }
    readVarBytesLE(max = 0x1000000) {
        return this.readBytes(this.readVarUIntLE(new bn_js_1.BN(max)).toNumber());
    }
    readVarUIntLE(max = new bn_js_1.BN('18446744073709551615', 10)) {
        const fb = this.readUInt8();
        let value;
        switch (fb) {
            case 0xfd:
                value = new bn_js_1.BN(this.readUInt16LE());
                break;
            case 0xfe:
                value = new bn_js_1.BN(this.readUInt32LE());
                break;
            case 0xff:
                value = this.readUInt64LE();
                break;
            default:
                value = new bn_js_1.BN(fb);
        }
        if (value.gt(max)) {
            throw new client_common_1.InvalidFormatError(`Integer too large: ${value.toString(10)} > ${max.toString(10)}`);
        }
        return value;
    }
    readVarString(max = 0x1000000) {
        return this.readVarBytesLE(max).toString('utf8');
    }
    readECPoint() {
        const firstByte = this.readBytes(1);
        if (firstByte[0] === client_common_1.common.ECPOINT_INFINITY_BYTE) {
            return client_common_1.common.ECPOINT_INFINITY;
        }
        return client_common_1.common.bufferToECPoint(Buffer.concat([firstByte, this.readBytes(client_common_1.common.ECPOINT_BUFFER_BYTES - 1)]));
    }
    checkRead(numBytes) {
        if (this.remaining < numBytes) {
            throw new client_common_1.InvalidFormatError(`Insufficient bytes remaining (${this.remaining}): ${numBytes}`);
        }
    }
}
exports.BinaryReader = BinaryReader;

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{ common, ECPoint, InvalidFormatError, UInt160, UInt256 } from '@neo-one/client-common';\nimport { BN } from 'bn.js';\nimport _ from 'lodash';\n\nexport class BinaryReader {\n  public readonly buffer: Buffer;\n  private mutableIndex: number;\n\n  public constructor(buffer: Buffer, index = 0) {\n    this.buffer = buffer;\n    this.mutableIndex = index;\n  }\n\n  public get index(): number {\n    return this.mutableIndex;\n  }\n\n  public get remaining(): number {\n    return this.buffer.length - this.mutableIndex;\n  }\n\n  public get remainingBuffer(): Buffer {\n    return this.buffer.slice(this.mutableIndex);\n  }\n\n  public hasMore(): boolean {\n    return this.mutableIndex < this.buffer.byteLength;\n  }\n\n  public clone(): BinaryReader {\n    return new BinaryReader(this.buffer, this.mutableIndex);\n  }\n\n  public readBytes(numBytes: number): Buffer {\n    this.checkRead(numBytes);\n    const result = this.buffer.slice(this.mutableIndex, this.mutableIndex + numBytes);\n    this.mutableIndex += numBytes;\n\n    return result;\n  }\n\n  public readInt8(): number {\n    this.checkRead(1);\n    const result = this.buffer.readInt8(this.mutableIndex);\n    this.mutableIndex += 1;\n\n    return result;\n  }\n\n  public readUInt8(): number {\n    this.checkRead(1);\n    const result = this.buffer.readUInt8(this.mutableIndex);\n    this.mutableIndex += 1;\n\n    return result;\n  }\n\n  public readBoolean(): boolean {\n    return this.readBytes(1)[0] !== 0;\n  }\n\n  public readInt16LE(): number {\n    this.checkRead(2);\n    const result = this.buffer.readInt16LE(this.mutableIndex);\n    this.mutableIndex += 2;\n\n    return result;\n  }\n\n  public readUInt16LE(): number {\n    this.checkRead(2);\n    const result = this.buffer.readUInt16LE(this.mutableIndex);\n    this.mutableIndex += 2;\n\n    return result;\n  }\n\n  public readUInt16BE(): number {\n    this.checkRead(2);\n    const result = this.buffer.readUInt16BE(this.mutableIndex);\n    this.mutableIndex += 2;\n\n    return result;\n  }\n\n  public readInt32LE(): number {\n    this.checkRead(4);\n    const result = this.buffer.readInt32LE(this.mutableIndex);\n    this.mutableIndex += 4;\n\n    return result;\n  }\n\n  public readUInt32LE(): number {\n    this.checkRead(4);\n    const result = this.buffer.readUInt32LE(this.mutableIndex);\n    this.mutableIndex += 4;\n\n    return result;\n  }\n\n  public readUInt64LE(): BN {\n    return new BN(this.readBytes(8), 'le');\n  }\n\n  public readInt64LE(): BN {\n    const buffer = this.readBytes(8);\n\n    return new BN(buffer, 'le').fromTwos(buffer.length * 8);\n  }\n\n  // NEO specific\n  public readUInt160(): UInt160 {\n    return common.bufferToUInt160(this.readBytes(common.UINT160_BUFFER_BYTES));\n  }\n\n  public readUInt256(): UInt256 {\n    return common.bufferToUInt256(this.readBytes(common.UINT256_BUFFER_BYTES));\n  }\n\n  public readFixed8(): BN {\n    return this.readInt64LE();\n  }\n\n  public readFixedString(length: number): string {\n    const values = _.takeWhile([...this.readBytes(length)], (value) => value !== 0);\n\n    return Buffer.from(values).toString('utf8');\n  }\n\n  public readArray<T>(read: () => T, max = 0x1000000): readonly T[] {\n    const count = this.readVarUIntLE(new BN(max)).toNumber();\n\n    return _.range(count).map(read);\n  }\n\n  public readObject<V>(\n    read: () => { readonly key: number; readonly value: V },\n    max?: number,\n  ): { readonly [key: number]: V };\n  public readObject<V>(\n    read: () => { readonly key: string; readonly value: V },\n    max?: number,\n  ): { readonly [key: string]: V };\n  public readObject<V>(\n    read: () => { readonly key: string | number; readonly value: V },\n    max = 0x1000000,\n  ): { readonly [key: string]: V } {\n    const count = this.readVarUIntLE(new BN(max)).toNumber();\n\n    return _.range(count).reduce<{ readonly [key: string]: V }>((acc) => {\n      const { key, value } = read();\n\n      return { ...acc, [key]: value };\n    }, {});\n  }\n\n  public readVarBytesLE(max = 0x1000000): Buffer {\n    return this.readBytes(this.readVarUIntLE(new BN(max)).toNumber());\n  }\n\n  public readVarUIntLE(max: BN = new BN('18446744073709551615', 10)): BN {\n    const fb = this.readUInt8();\n    let value: BN;\n    switch (fb) {\n      case 0xfd:\n        value = new BN(this.readUInt16LE());\n        break;\n      case 0xfe:\n        value = new BN(this.readUInt32LE());\n        break;\n      case 0xff:\n        value = this.readUInt64LE();\n        break;\n      default:\n        value = new BN(fb);\n    }\n\n    if (value.gt(max)) {\n      throw new InvalidFormatError(`Integer too large: ${value.toString(10)} > ${max.toString(10)}`);\n    }\n\n    return value;\n  }\n\n  public readVarString(max = 0x1000000): string {\n    return this.readVarBytesLE(max).toString('utf8');\n  }\n\n  public readECPoint(): ECPoint {\n    const firstByte = this.readBytes(1);\n    if (firstByte[0] === common.ECPOINT_INFINITY_BYTE) {\n      return common.ECPOINT_INFINITY;\n    }\n\n    return common.bufferToECPoint(Buffer.concat([firstByte, this.readBytes(common.ECPOINT_BUFFER_BYTES - 1)]));\n  }\n\n  private checkRead(numBytes: number): void {\n    if (this.remaining < numBytes) {\n      throw new InvalidFormatError(`Insufficient bytes remaining (${this.remaining}): ${numBytes}`);\n    }\n  }\n}\n"]}