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/* Copyright 2012 The Native Client Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can
* be found in the LICENSE file.
*/
// Defines utility allowing files for bitcode input wrapping.
#ifndef FILE_WRAPPER_INPUT_H__
#define FILE_WRAPPER_INPUT_H__
#include "llvm/Support/support_macros.h"
#include "llvm/Wrap/wrapper_input.h"
#include <stdio.h>
#include <string>
// Define a class to wrap named files.
class FileWrapperInput : public WrapperInput {
public:
FileWrapperInput(const std::string& name);
~FileWrapperInput();
// Tries to read the requested number of bytes into the buffer. Returns the
// actual number of bytes read.
virtual size_t Read(uint8_t* buffer, size_t wanted);
// Returns true if at end of file. Note: May return false
// until Read is called, and returns 0.
virtual bool AtEof();
// Returns the size of the file (in bytes).
virtual off_t Size();
// Moves to the given offset within the file. Returns
// false if unable to move to that position.
virtual bool Seek(uint32_t pos);
private:
// The name of the file.
std::string _name;
// True once eof has been encountered.
bool _at_eof;
// True if size has been computed.
bool _size_found;
// The size of the file.
off_t _size;
// The corresponding (opened) file.
FILE* _file;
private:
DISALLOW_CLASS_COPY_AND_ASSIGN(FileWrapperInput);
};
#endif // FILE_WRAPPER_INPUT_H__
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