/* Copyright (c) 2008-present Advanced Micro Devices, Inc.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE. */

#ifndef _ELF_UTILS_HPP
#define _ELF_UTILS_HPP


#include <cstdlib>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "top.hpp"

namespace amd {

#define MAX_ERROR_MESSAGE_LENGTH 1024
#define IO_BUF_SIZE            16 * 1024

class OclElfErr
{
public:
    // Temperary buffer for copying from file to file
    uint8_t* _copyBuffer;   // Initialized first time it is used

private:
    //  Keep the last error message.
    char _lastErrMsg[MAX_ERROR_MESSAGE_LENGTH];

public:

    OclElfErr() : _copyBuffer(NULL) { _lastErrMsg[0] = 0; }
    ~OclElfErr()  {
        if (_copyBuffer) {
            free(_copyBuffer);
        }
    }

    void Init() { _lastErrMsg[0] = 0; }

    void Fini() { 
        _lastErrMsg[0] = 0;
        if (_copyBuffer) {
            free(_copyBuffer);
        }
        _copyBuffer = NULL;
    }

    // Return the last error message.
    const char* getOclElfError() const { return _lastErrMsg; }

    // 
    // Save the error string in ErrorMessage.  If it is built without NDEBUG, the program
    // will terminate immediately with exit(1).
    //
    void xfail(const char *fmt, ...);

};

namespace oclelfutils {

/*
   Wrap malloc() with xfail(), so this returns newly-allocated memory or 0.
   The memory is guaranteed to be initialized to zero.
 */
void* xmalloc(OclElfErr& err, const size_t len);

/*
   Return file descriptor on success; return -1 on error and invoke xfail()
   to record the error.
 */
int xopen(OclElfErr& err, const char *fname, const int flags, const int perms);

/* 
   Return 0 on success; return -1 on error.
 */
int xclose(OclElfErr& err, const char *fname, const int fd);

/* 
   Return the file offset location on success; return -1 on error.
 */
off_t xlseek(OclElfErr& err, const char *fname, const int fd,
             const off_t o, const int whence);

/*
   Return the number of bytes that are read on success; return -1 on error.
 */
ssize_t xread(
    OclElfErr&   err, 
    const char*  fname,   // File name for file descriptor 'fd'
    const int    fd,      // File descriptor
    void*        buf,     // buffer for reading
    const size_t buf_len  // capacity of buffer in bytes
    );

#if 0

/*
   Return the number of bytes that have been written on success; return -1 on error.
 */
ssize_t xwrite(
    OclElfErr&   err,
    const char*  fname,  // File name for file descriptor 'fd'
    const int    fd,     // File descriptor
    const void*  buf,    // data buffer to be written out
    const size_t buf_len // the size of data in bytes
    );

/*
   Allocate a copy of (str), invoke xfail() on failure.
   Returns 0 on error, or address of the allocated copy
 */
char* xstrdup(OclElfErr& err, const char *str);

/*
   get the length of an open file in bytes. return -1 if error.
 */
uint64_t xget_file_size(OclElfErr& err, const char *fname, const int fd);

/*
   Copy file 'infd' to file 'outfd'.
   Return the total number of bytes copied on success; return -1 on error.
 */
int64_t xcopyfile(OclElfErr& err, const char *in, const int infd,
                  const char *out, const int outfd);

/*
   Copy file from 'infd' to current offset in 'outfd', for 'size' bytes.
   Return 'size' on success; return -1 on error.
 */
int64_t xcopyfile_range(OclElfErr& err, const char *in, const int infd,
                     const char *out, const int outfd,
                     const uint64_t offset, const uint64_t size);


// Align a value to the page size.
uint64_t align_to_page(const uint64_t offset);

#endif

} // namespace elfutils

} // namespace amd

#endif