First pass of ImageWriter
Change-Id: I4f189587a2e3cc1c265200b8fa64321b299947eb
diff --git a/src/file.h b/src/file.h
new file mode 100644
index 0000000..680872e
--- /dev/null
+++ b/src/file.h
@@ -0,0 +1,49 @@
+// Copyright 2009 Google Inc. All Rights Reserved.
+
+#ifndef ART_SRC_FILE_H_
+#define ART_SRC_FILE_H_
+
+#include <stdint.h>
+#include <sys/types.h>
+
+namespace art {
+
+class File {
+ public:
+ virtual ~File() { }
+
+ virtual int64_t Read(void* buffer, int64_t num_bytes) = 0;
+ virtual int64_t Write(const void* buffer, int64_t num_bytes) = 0;
+
+ // ReadFully and WriteFully do attempt to transfer all of the bytes to/from
+ // the buffer. In the event of short accesses they will loop internally until
+ // the whole buffer has been transferred or an error occurs. If an error
+ // occurred the result will be set to false.
+ virtual bool ReadFully(void* buffer, int64_t num_bytes);
+ virtual bool WriteFully(const void* buffer, int64_t num_bytes);
+ bool WriteByte(uint8_t byte) {
+ return WriteFully(&byte, 1);
+ }
+
+ // Get the length of the file. Returns a negative value if the length cannot
+ // be determined (e.g. not seekable device).
+ virtual off_t Length() = 0;
+
+ // Get the current position in the file.
+ // Returns a negative value if position cannot be determined.
+ virtual off_t Position() = 0;
+
+ const char* name() const { return name_; }
+
+ protected:
+ explicit File(const char* name) : name_(name) { }
+ virtual void Close() = 0;
+ virtual bool IsClosed() = 0;
+
+ private:
+ const char* name_;
+};
+
+} // namespace art
+
+#endif // ART_SRC_FILE_H_