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diff --git a/cmd/ethtest/lib/abi.js b/cmd/ethtest/lib/abi.js
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+/*
+ This file is part of ethereum.js.
+
+ ethereum.js is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ ethereum.js is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file abi.js
+ * @authors:
+ * Marek Kotewicz <marek@ethdev.com>
+ * Gav Wood <g@ethdev.com>
+ * @date 2014
+ */
+
+// TODO: make these be actually accurate instead of falling back onto JS's doubles.
+var hexToDec = function (hex) {
+ return parseInt(hex, 16).toString();
+};
+
+var decToHex = function (dec) {
+ return parseInt(dec).toString(16);
+};
+
+var findIndex = function (array, callback) {
+ var end = false;
+ var i = 0;
+ for (; i < array.length && !end; i++) {
+ end = callback(array[i]);
+ }
+ return end ? i - 1 : -1;
+};
+
+var findMethodIndex = function (json, methodName) {
+ return findIndex(json, function (method) {
+ return method.name === methodName;
+ });
+};
+
+var padLeft = function (string, chars) {
+ return Array(chars - string.length + 1).join("0") + string;
+};
+
+var setupInputTypes = function () {
+ var prefixedType = function (prefix) {
+ return function (type, value) {
+ var expected = prefix;
+ if (type.indexOf(expected) !== 0) {
+ return false;
+ }
+
+ var padding = parseInt(type.slice(expected.length)) / 8;
+ if (typeof value === "number")
+ value = value.toString(16);
+ else if (value.indexOf('0x') === 0)
+ value = value.substr(2);
+ else
+ value = (+value).toString(16);
+ return padLeft(value, padding * 2);
+ };
+ };
+
+ var namedType = function (name, padding, formatter) {
+ return function (type, value) {
+ if (type !== name) {
+ return false;
+ }
+
+ return padLeft(formatter ? formatter(value) : value, padding * 2);
+ };
+ };
+
+ var formatBool = function (value) {
+ return value ? '0x1' : '0x0';
+ };
+
+ return [
+ prefixedType('uint'),
+ prefixedType('int'),
+ prefixedType('hash'),
+ namedType('address', 20),
+ namedType('bool', 1, formatBool),
+ ];
+};
+
+var inputTypes = setupInputTypes();
+
+var toAbiInput = function (json, methodName, params) {
+ var bytes = "";
+ var index = findMethodIndex(json, methodName);
+
+ if (index === -1) {
+ return;
+ }
+
+ bytes = "0x" + padLeft(index.toString(16), 2);
+ var method = json[index];
+
+ for (var i = 0; i < method.inputs.length; i++) {
+ var found = false;
+ for (var j = 0; j < inputTypes.length && !found; j++) {
+ found = inputTypes[j](method.inputs[i].type, params[i]);
+ }
+ if (!found) {
+ console.error('unsupported json type: ' + method.inputs[i].type);
+ }
+ bytes += found;
+ }
+ return bytes;
+};
+
+var setupOutputTypes = function () {
+ var prefixedType = function (prefix) {
+ return function (type) {
+ var expected = prefix;
+ if (type.indexOf(expected) !== 0) {
+ return -1;
+ }
+
+ var padding = parseInt(type.slice(expected.length)) / 8;
+ return padding * 2;
+ };
+ };
+
+ var namedType = function (name, padding) {
+ return function (type) {
+ return name === type ? padding * 2 : -1;
+ };
+ };
+
+ var formatInt = function (value) {
+ return value.length <= 8 ? +parseInt(value, 16) : hexToDec(value);
+ };
+
+ var formatHash = function (value) {
+ return "0x" + value;
+ };
+
+ var formatBool = function (value) {
+ return value === '1' ? true : false;
+ };
+
+ return [
+ { padding: prefixedType('uint'), format: formatInt },
+ { padding: prefixedType('int'), format: formatInt },
+ { padding: prefixedType('hash'), format: formatHash },
+ { padding: namedType('address', 20) },
+ { padding: namedType('bool', 1), format: formatBool }
+ ];
+};
+
+var outputTypes = setupOutputTypes();
+
+var fromAbiOutput = function (json, methodName, output) {
+ var index = findMethodIndex(json, methodName);
+
+ if (index === -1) {
+ return;
+ }
+
+ output = output.slice(2);
+
+ var result = [];
+ var method = json[index];
+ for (var i = 0; i < method.outputs.length; i++) {
+ var padding = -1;
+ for (var j = 0; j < outputTypes.length && padding === -1; j++) {
+ padding = outputTypes[j].padding(method.outputs[i].type);
+ }
+
+ if (padding === -1) {
+ // not found output parsing
+ continue;
+ }
+ var res = output.slice(0, padding);
+ var formatter = outputTypes[j - 1].format;
+ result.push(formatter ? formatter(res) : ("0x" + res));
+ output = output.slice(padding);
+ }
+
+ return result;
+};
+
+var inputParser = function (json) {
+ var parser = {};
+ json.forEach(function (method) {
+ parser[method.name] = function () {
+ var params = Array.prototype.slice.call(arguments);
+ return toAbiInput(json, method.name, params);
+ };
+ });
+
+ return parser;
+};
+
+var outputParser = function (json) {
+ var parser = {};
+ json.forEach(function (method) {
+ parser[method.name] = function (output) {
+ return fromAbiOutput(json, method.name, output);
+ };
+ });
+
+ return parser;
+};
+
+module.exports = {
+ inputParser: inputParser,
+ outputParser: outputParser
+};