Implement File API

src/DefaultFileSystem.cpp

Index: src/DefaultFileSystem.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/src/DefaultFileSystem.cpp
@@ -0,0 +1,73 @@
+#include <AdblockPlus/DefaultFileSystem.h>
+#include <cstdio>
+#include <fstream>
+#include <stdexcept>
+
+#ifndef WIN32
+#include <cerrno>
+#include <sys/stat.h>
+#endif
+
+#include "../src/Utils.h"
+
+using namespace AdblockPlus;
+
+namespace
+{
+  class RuntimeErrorWithErrno : public std::runtime_error
+  {
+  public:
+    explicit RuntimeErrorWithErrno(const std::string& message)
+      : std::runtime_error(message + " (" + strerror(errno) + ")")
+    {
+    }
+  };
+}
+
+std::tr1::shared_ptr<std::istream>
+DefaultFileSystem::Read(const std::string& path) const
+{
+  return std::tr1::shared_ptr<std::istream>(new std::ifstream(path.c_str()));
+}
+
+void DefaultFileSystem::Write(const std::string& path,
+                              std::tr1::shared_ptr<std::ostream> data)
+{
+  std::ofstream file(path.c_str());
+  file << Utils::Slurp(*data);
+}
+
+void DefaultFileSystem::Move(const std::string& fromPath,
+                             const std::string& toPath)
+{
+  if (rename(fromPath.c_str(), toPath.c_str()))
+    throw RuntimeErrorWithErrno("Failed to move " + fromPath + " to " + toPath);
+}
+
+void DefaultFileSystem::Remove(const std::string& path)
+{
+  if (remove(path.c_str()))
+    throw RuntimeErrorWithErrno("Failed to remove " + path);
+}
+
+FileSystem::StatResult DefaultFileSystem::Stat(const std::string& path) const
+{
+#ifdef WIN32
+  struct _stat64 nativeStat;
+  const int failure = _stat64(path.c_str(), &nativeStat);
+#else
+  struct stat64 nativeStat;
+  const int failure = stat64(path.c_str(), &nativeStat);
+#endif
+  if (failure) {
+    if (errno == ENOENT)
+      return FileSystem::StatResult();
+    throw RuntimeErrorWithErrno("Unable to stat " + path);
+  }
+  FileSystem::StatResult result;
+  result.exists = true;
+  result.isFile = S_ISREG(nativeStat.st_mode);
+  result.isDirectory = S_ISDIR(nativeStat.st_mode);
+  result.lastModified = nativeStat.st_mtime;
+  return result;
+}