myvtm/Framework/libtoolkit/bspatch.h

/*-
 * Copyright 2003-2005 Colin Percival
 * Copyright 2012 Matthew Endsley
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted providing that the following conditions 
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef BSPATCH_H
# define BSPATCH_H

#pragma once

# include <stdint.h>
#include "config.h"

#ifdef __cplusplus
extern "C" {
#endif

    struct bspatch_stream
    {
        void* opaque;
        int (*read)(const struct bspatch_stream* stream, void* buffer, int length);
    };

    static int64_t offtin(uint8_t* buf)
    {
        int64_t y;

        y = buf[7] & 0x7F;
        y = y * 256; y += buf[6];
        y = y * 256; y += buf[5];
        y = y * 256; y += buf[4];
        y = y * 256; y += buf[3];
        y = y * 256; y += buf[2];
        y = y * 256; y += buf[1];
        y = y * 256; y += buf[0];

        if (buf[7] & 0x80) y = -y;

        return y;
    }

    TOOLKIT_API int bspatch(const uint8_t* old, int64_t oldsize, uint8_t* newone, int64_t newsize, struct bspatch_stream* patchtream);

#ifdef __cplusplus
} // extern "C" {
#endif

#endif