@ethereumjs/evm
Version:
JavaScript Ethereum Virtual Machine (EVM) implementation
63 lines • 2.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.moduloLengthCheck = exports.equalityLengthCheck = exports.gasLimitCheck = void 0;
const util_1 = require("@ethereumjs/util");
/**
* Checks that the gas used remain under the gas limit.
*
* @param opts - Precompile input wrapper
* @param gasUsed - Amount of gas consumed by the precompile
* @param pName - Human readable precompile name for logging
* @returns `true` if the gas usage is within the provided limit
*/
const gasLimitCheck = (opts, gasUsed, pName) => {
if (opts._debug !== undefined) {
opts._debug(`Run ${pName} precompile data=${(0, util_1.short)(opts.data)} length=${opts.data.length} gasLimit=${opts.gasLimit} gasUsed=${gasUsed}`);
}
if (opts.gasLimit < gasUsed) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: OOG`);
}
return false;
}
return true;
};
exports.gasLimitCheck = gasLimitCheck;
/**
* Checks that the length of the provided data is equal to `length`.
*
* @param opts - Precompile input wrapper
* @param length - Required data length in bytes
* @param pName - Human readable precompile name for logging
* @returns `true` if the provided data matches the required length
*/
const equalityLengthCheck = (opts, length, pName) => {
if (opts.data.length !== length) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: Invalid input length length=${opts.data.length} (expected: ${length})`);
}
return false;
}
return true;
};
exports.equalityLengthCheck = equalityLengthCheck;
/**
* Checks that the total length of the provided data input can be subdivided into k equal parts
* with `length` (without leaving some remainder bytes).
*
* @param opts - Precompile input wrapper
* @param length - Required chunk size
* @param pName - Human readable precompile name for logging
* @returns `true` if the length is divisible by the chunk size
*/
const moduloLengthCheck = (opts, length, pName) => {
if (opts.data.length % length !== 0) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: Invalid input length length=${opts.data.length} (expected: ${length}*k bytes)`);
}
return false;
}
return true;
};
exports.moduloLengthCheck = moduloLengthCheck;
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