@truffle/codec
Version:
Library for encoding and decoding smart contract data
82 lines • 3.01 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.readBytes = exports.readCode = void 0;
const Evm = __importStar(require("../../evm"));
const errors_1 = require("../../errors");
function* readCode(pointer, state) {
let code = state.code;
if (!code) {
const address = Evm.Utils.toAddress(state.specials.this);
code = yield {
type: "code",
address
};
if (code === null) {
//check for null as a way to deliberately indicate an error
throw new errors_1.DecodingError({
kind: "CodeNotSuppliedError",
address
});
}
}
return readBytes(pointer, Object.assign(Object.assign({}, state), { code }));
}
exports.readCode = readCode;
function readBytes(pointer, state) {
let sourceBytes = state[pointer.location];
const { start: offset, length } = pointer;
if (!Number.isSafeInteger(offset + length)) {
throw new errors_1.DecodingError({
kind: "ReadErrorBytes",
location: pointer.location,
start: offset,
length
});
}
// grab `length` bytes no matter what, here fill this array
var bytes = new Uint8Array(length);
bytes.fill(0); //fill it wil zeroes to start
//if the start is beyond the end of the source, just return those 0s
if (offset >= sourceBytes.length) {
return bytes;
}
// if we're reading past the end of the source, truncate the length to read
let excess = offset + length - sourceBytes.length;
let readLength;
if (excess > 0) {
readLength = sourceBytes.length - offset;
}
else {
readLength = length;
}
//get the (truncated) bytes
let existing = new Uint8Array(sourceBytes.buffer, offset, readLength);
//copy it into our buffer
bytes.set(existing);
return bytes;
}
exports.readBytes = readBytes;
//# sourceMappingURL=index.js.map