1 files changed, 74 insertions, 0 deletions
diff --git a/klm/util/file.hh b/klm/util/file.hh
new file mode 100644
index 00000000..d6cca41d
--- /dev/null
+++ b/klm/util/file.hh
@@ -0,0 +1,74 @@
+#ifndef UTIL_FILE__
+#define UTIL_FILE__
+
+#include <cstdio>
+#include <unistd.h>
+
+namespace util {
+
+class scoped_fd {
+  public:
+    scoped_fd() : fd_(-1) {}
+
+    explicit scoped_fd(int fd) : fd_(fd) {}
+
+    ~scoped_fd();
+
+    void reset(int to) {
+      scoped_fd other(fd_);
+      fd_ = to;
+    }
+
+    int get() const { return fd_; }
+
+    int operator*() const { return fd_; }
+
+    int release() {
+      int ret = fd_;
+      fd_ = -1;
+      return ret;
+    }
+
+    operator bool() { return fd_ != -1; }
+
+  private:
+    int fd_;
+
+    scoped_fd(const scoped_fd &);
+    scoped_fd &operator=(const scoped_fd &);
+};
+
+class scoped_FILE {
+  public:
+    explicit scoped_FILE(std::FILE *file = NULL) : file_(file) {}
+
+    ~scoped_FILE();
+
+    std::FILE *get() { return file_; }
+    const std::FILE *get() const { return file_; }
+
+    void reset(std::FILE *to = NULL) {
+      scoped_FILE other(file_);
+      file_ = to;
+    }
+
+  private:
+    std::FILE *file_;
+};
+
+int OpenReadOrThrow(const char *name);
+
+int CreateOrThrow(const char *name);
+
+// Return value for SizeFile when it can't size properly.  
+const off_t kBadSize = -1;
+off_t SizeFile(int fd);
+
+void ReadOrThrow(int fd, void *to, std::size_t size);
+void WriteOrThrow(int fd, const void *data_void, std::size_t size);
+
+void RemoveOrThrow(const char *name);
+
+} // namespace util
+
+#endif // UTIL_FILE__