Get libgit2 working for 8thwall. (#24)

Upgrade libgit2 with support for 8thwall cloud editor.

Author: VinnyOG

deps/picosha2/picosha2-c.cc

@@ -0,0 +1,17 @@
+#include "picosha2-c.h"
+#include "picosha2.h"
+
+#include <array>
+#include <cstring>
+#include <string>
+
+extern "C" {
+
+void picosha2_256(const char *buffer, int len, char *dest) {
+  std::array<uint8_t, picosha2::k_digest_size> hash;
+  picosha2::hash256(buffer, buffer + len, std::begin(hash), std::end(hash));
+  std::string sha256 =
+      picosha2::bytes_to_hex_string(std::begin(hash), std::end(hash));
+  std::memcpy(dest, sha256.c_str(), sha256.size() + 1);
+}
+}

deps/picosha2/picosha2-c.h

@@ -0,0 +1,14 @@
+#ifndef INCLUDE_picosha2_c_h__
+#define INCLUDE_picosha2_c_h__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void picosha2_256(const char* buffer, int len, char* dest);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif