Make the Solidity repository standalone.

This commit is the culmination of several months of work to decouple Solidity from the webthree-umbrella so that it can be developed in parallel with cpp-ethereum (the Ethereum C++ runtime) and so that even for the Solidity unit-tests there is no hard-dependency onto the C++ runtime.

The Tests-over-IPC refactoring was a major step in the same process which was already committed.

This commit contains the following changes:

- A subset of the CMake functionality in webthree-helpers was extracted and tailored for Solidity into ./cmake.   Further cleanup is certainly possible.
- A subset of the libdevcore functionality in libweb3core was extracted and tailored for Solidity into ./libdevcore.   Further cleanup is certainly possible
- The gas price constants in EVMSchedule were orphaned into libevmasm.
- Some other refactorings and cleanups were made to sever unnecessary EVM dependencies in the Solidity unit-tests.
- TravisCI and Appveyor support was added, covering builds and running of the unit-tests (Linux and macOS only for now)
- A bug-fix was made to get the Tests-over-IPC running on macOS.
- There are still reliability issues in the unit-tests, which need immediate attention.    The Travis build has been flipped to run the unit-tests 5 times, to try to flush these out.
- The Emscripten automation which was previously in webthree-umbrella was merged into the TravisCI automation here.
- The development ZIP deployment step has been commented out, but we will want to read that ONLY for release branch.

Further iteration on these changes will definitely be needed, but I feel these have got to sufficient maturity than holding them back further isn't winning us anything.    It is go time :-)

1 files changed, 146 insertions, 0 deletions

diff --git a/libdevcore/Base64.cpp b/libdevcore/Base64.cpp
new file mode 100644
index 00000000..8ee2b29f
--- /dev/null
+++ b/libdevcore/Base64.cpp
@@ -0,0 +1,146 @@
+/*
+   base64.cpp and base64.h
+
+   Copyright (C) 2004-2008 René Nyffenegger
+
+   This source code is provided 'as-is', without any express or implied
+   warranty. In no event will the author be held liable for any damages
+   arising from the use of this software.
+
+   Permission is granted to anyone to use this software for any purpose,
+   including commercial applications, and to alter it and redistribute it
+   freely, subject to the following restrictions:
+
+   1. The origin of this source code must not be misrepresented; you must not
+	  claim that you wrote the original source code. If you use this source code
+	  in a product, an acknowledgment in the product documentation would be
+	  appreciated but is not required.
+
+   2. Altered source versions must be plainly marked as such, and must not be
+	  misrepresented as being the original source code.
+
+   3. This notice may not be removed or altered from any source distribution.
+
+   René Nyffenegger rene.nyffenegger@adp-gmbh.ch
+*/
+/// Adapted from code found on http://stackoverflow.com/questions/180947/base64-decode-snippet-in-c
+/// Originally by René Nyffenegger, modified by some other guy and then devified by Gav Wood.
+
+#include "Base64.h"
+
+using namespace std;
+using namespace dev;
+
+static inline bool is_base64(byte c)
+{
+	return (isalnum(c) || (c == '+') || (c == '/'));
+}
+
+static inline byte find_base64_char_index(byte c)
+{
+	if ('A' <= c && c <= 'Z') return c - 'A';
+	else if ('a' <= c && c <= 'z') return c - 'a' + 1 + find_base64_char_index('Z');
+	else if ('0' <= c && c <= '9') return c - '0' + 1 + find_base64_char_index('z');
+	else if (c == '+') return 1 + find_base64_char_index('9');
+	else if (c == '/') return 1 + find_base64_char_index('+');
+	else return 1 + find_base64_char_index('/');
+}
+
+string dev::toBase64(bytesConstRef _in)
+{
+	static const char base64_chars[] =
+		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+		"abcdefghijklmnopqrstuvwxyz"
+		"0123456789+/";
+
+	string ret;
+	int i = 0;
+	int j = 0;
+	byte char_array_3[3];
+	byte char_array_4[4];
+
+	auto buf = _in.data();
+	auto bufLen = _in.size();
+
+	while (bufLen--)
+	{
+		char_array_3[i++] = *(buf++);
+		if (i == 3)
+		{
+			char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+			char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+			char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+			char_array_4[3] = char_array_3[2] & 0x3f;
+
+			for (i = 0; i < 4; i++)
+				ret += base64_chars[char_array_4[i]];
+			i = 0;
+		}
+	}
+
+	if (i)
+	{
+		for (j = i; j < 3; j++)
+			char_array_3[j] = '\0';
+
+		char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+		char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+		char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+		char_array_4[3] = char_array_3[2] & 0x3f;
+
+		for (j = 0; j < i + 1; j++)
+			ret += base64_chars[char_array_4[j]];
+
+		while (i++ < 3)
+			ret += '=';
+	}
+
+	return ret;
+}
+
+bytes dev::fromBase64(string const& encoded_string)
+{
+	auto in_len = encoded_string.size();
+	int i = 0;
+	int j = 0;
+	int in_ = 0;
+	byte char_array_3[3];
+	byte char_array_4[4];
+	bytes ret;
+
+	while (in_len-- && encoded_string[in_] != '=' && is_base64(encoded_string[in_]))
+	{
+		char_array_4[i++] = encoded_string[in_]; in_++;
+		if (i == 4)
+		{
+			for (i = 0; i < 4; i++)
+				char_array_4[i] = find_base64_char_index(char_array_4[i]);
+
+			char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+			char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+			char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+			for (i = 0; (i < 3); i++)
+				ret.push_back(char_array_3[i]);
+			i = 0;
+		}
+	}
+
+	if (i)
+	{
+		for (j = i; j < 4; j++)
+			char_array_4[j] = 0;
+
+		for (j = 0; j < 4; j++)
+		char_array_4[j] = find_base64_char_index(char_array_4[j]);
+
+		char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+		char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+		char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+		for (j = 0; j < i - 1; j++)
+			ret.push_back(char_array_3[j]);
+	}
+
+	return ret;
+}