v0.0.6 - Addition of several other typecast methods (#20)

* Vanity updates

* Add type cast method to `bytes32`

* Update to the natSpec comment on top of both libraries 😄

Though I really like Nick Johnson's string library this has been built entirely by me (as opposed to what the NatSpec comment in the top said since the last commit 😄) I just copied the comment layout on top of his library and forgot to change the author 😂

* Adding Solidity highlight to gitattribute

🎉 😄

* Update package versions & prepare for NPM publish

* Create a NPM ignore file to keep `truffle.js` from being published

* Syntax & pragmas updates for v0.5.0

* Update README to reflect NPM publish

* Another README update

* Support for typecasting into uint8, uint16, uint32 (#19)

* Add uint8, uint16, uint32

* Unit test for uint8, uint16, uint32

* Removing Truffle as a dependency

* Bump version to v0.0.6

README.md

@@ -31,12 +31,28 @@ and use the library `AssertBytes` much like they use `Assert` in Truffle's [exam
 
 ## EthPM
 
-This library is published at EPM under the alias `bytes`
+This library is published in EPM under the alias `bytes`
 
 **Installing it with Truffle**
 
 ```
-truffle install bytes
+$ truffle install bytes
+```
+
+## NPM
+
+This library is published in NPM under the alias `solidity-bytes-utils`
+
+**Installing it with NPM**
+
+```
+$ npm install solidity-bytes-utils
+```
+
+**Importing it in your Solidity contract**
+
+```
+import "solidity-bytes-utils/BytesLib.sol";
 ```
 
 ## Contributing

contracts/BytesLib.sol

@@ -286,6 +286,39 @@ library BytesLib {
         return tempAddress;
     }
 
+    function toUint8(bytes _bytes, uint _start) internal  pure returns (uint8) {
+        require(_bytes.length >= (_start + 1));
+        uint8 tempUint;
+
+        assembly {
+            tempUint := mload(add(add(_bytes, 0x1), _start))
+        }
+
+        return tempUint;
+    }
+
+    function toUint16(bytes _bytes, uint _start) internal  pure returns (uint16) {
+        require(_bytes.length >= (_start + 2));
+        uint16 tempUint;
+
+        assembly {
+            tempUint := mload(add(add(_bytes, 0x2), _start))
+        }
+
+        return tempUint;
+    }
+
+    function toUint32(bytes _bytes, uint _start) internal  pure returns (uint32) {
+        require(_bytes.length >= (_start + 4));
+        uint32 tempUint;
+
+        assembly {
+            tempUint := mload(add(add(_bytes, 0x4), _start))
+        }
+
+        return tempUint;
+    }
+
     function toUint(bytes _bytes, uint _start) internal  pure returns (uint256) {
         require(_bytes.length >= (_start + 32));
         uint256 tempUint;

ethpm.json

@@ -1,6 +1,6 @@
 {
   "package_name": "bytes",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "description": "Solidity bytes tightly packed arrays utility library.",
   "authors": [
     "Gonçalo Sá <goncalo.sa@consensys.net>"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "solidity-bytes-utils",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "description": "Solidity bytes tightly packed arrays utility library.",
   "main": "truffle.js",
   "repository": {

test/TestBytesLib2.sol

@@ -126,14 +126,98 @@ contract TestBytesLib2 {
         // This should throw;
     }
 
+    function testToUint8() public {
+        bytes memory memBytes = hex"f00d20feed";
+
+        uint8 testUint8 = 32; // 0x20 == 32
+        uint8 resultUint8;
+
+        resultUint8 = memBytes.toUint8(2);
+        Assert.equal(uint256(resultUint8), uint256(testUint8), "Typecast to 8-bit-wide unsigned integer failed.");
+
+        // Now we're going to test for slicing actions that throw present in the functions below
+        // with a ThrowProxy contract
+        // v. http://truffleframework.com/tutorials/testing-for-throws-in-solidity-tests
+        ThrowProxy throwProxy = new ThrowProxy(address(this));
+
+        TestBytesLib2(address(throwProxy)).toUint8Throw();
+        bool r = throwProxy.execute.gas(100000)();
+        Assert.isFalse(r, "Typecasting with wrong index should throw");
+    }
+
+    function toUint8Throw() public pure {
+        bytes memory memBytes = hex"f00d42feed";
+
+        uint8 resultUint8;
+
+        resultUint8 = memBytes.toUint8(35);
+        // This should throw;
+    }
+
+    function testToUint16() public {
+        bytes memory memBytes = hex"f00d0020feed";
+
+        uint16 testUint16 = 32; // 0x20 == 32
+        uint16 resultUint16;
+
+        resultUint16 = memBytes.toUint16(2);
+        Assert.equal(uint256(resultUint16), uint256(testUint16), "Typecast to 16-bit-wide unsigned integer failed.");
+
+        // Now we're going to test for slicing actions that throw present in the functions below
+        // with a ThrowProxy contract
+        // v. http://truffleframework.com/tutorials/testing-for-throws-in-solidity-tests
+        ThrowProxy throwProxy = new ThrowProxy(address(this));
+
+        TestBytesLib2(address(throwProxy)).toUint16Throw();
+        bool r = throwProxy.execute.gas(100000)();
+        Assert.isFalse(r, "Typecasting with wrong index should throw");
+    }
+
+    function toUint16Throw() public pure {
+        bytes memory memBytes = hex"f00d0042feed";
+
+        uint16 resultUint16;
+
+        resultUint16 = memBytes.toUint16(35);
+        // This should throw;
+    }
+
+    function testToUint32() public {
+        bytes memory memBytes = hex"f00d00000020feed";
+
+        uint32 testUint32 = 32; // 0x20 == 32
+        uint32 resultUint32;
+
+        resultUint32 = memBytes.toUint32(2);
+        Assert.equal(uint256(resultUint32), uint256(testUint32), "Typecast to 32-bit-wide unsigned integer failed.");
+
+        // Now we're going to test for slicing actions that throw present in the functions below
+        // with a ThrowProxy contract
+        // v. http://truffleframework.com/tutorials/testing-for-throws-in-solidity-tests
+        ThrowProxy throwProxy = new ThrowProxy(address(this));
+
+        TestBytesLib2(address(throwProxy)).toUint32Throw();
+        bool r = throwProxy.execute.gas(100000)();
+        Assert.isFalse(r, "Typecasting with wrong index should throw");
+    }
+
+    function toUint32Throw() public pure {
+        bytes memory memBytes = hex"f00d00000042feed";
+
+        uint32 resultUint32;
+
+        resultUint32 = memBytes.toUint32(35);
+        // This should throw;
+    }
+
     function testToUint() public {
         bytes memory memBytes = hex"f00d0000000000000000000000000000000000000000000000000000000000000020feed";
 
         uint256 testUint = 32; // 0x20 == 32
         uint256 resultUint;
 
         resultUint = memBytes.toUint(2);
-        Assert.equal(resultUint, testUint, "Typecast to unsigned integer failed.");
+        Assert.equal(resultUint, testUint, "Typecast to 256-bit-wide unsigned integer failed.");
 
         // Now we're going to test for slicing actions that throw present in the functions below
         // with a ThrowProxy contract