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/* $Id: VBoxCmp.cpp $ */
/** @file
* File Compare - Compares two files byte by byte.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <iprt/string.h>
#include <iprt/stdarg.h>
/**
* Writes an error message.
*
* @returns RTEXITCODE_FAILURE.
* @param pcszFormat Error message.
* @param ... Format argument referenced in the message.
*/
static RTEXITCODE printErr(const char *pcszFormat, ...)
{
va_list va;
fprintf(stderr, "VBoxCmp: ");
va_start(va, pcszFormat);
vfprintf(stderr, pcszFormat, va);
va_end(va);
return RTEXITCODE_FAILURE;
}
static FILE *openFile(const char *pszFile)
{
#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
FILE *pFile = fopen(pszFile, "rb");
#else
FILE *pFile = fopen(pszFile, "r");
#endif
if (!pFile)
printErr("Failed to open '%s': %s\n", pszFile, strerror(errno));
return pFile;
}
static RTEXITCODE compareFiles(FILE *pFile1, FILE *pFile2)
{
if (!pFile1 || !pFile2)
return RTEXITCODE_FAILURE;
uint32_t cMismatches = 1;
RTEXITCODE rcRet = RTEXITCODE_SUCCESS;
uint64_t off = 0;
for (;;)
{
uint8_t b1;
size_t cb1 = fread(&b1, sizeof(b1), 1, pFile1);
uint8_t b2;
size_t cb2 = fread(&b2, sizeof(b2), 1, pFile2);
if (cb1 != 1 || cb2 != 1)
break;
if (b1 != b2)
{
printErr("0x%x%08x: %#04x (%3d) != %#04x (%3d)\n", (uint32_t)(off >> 32), (uint32_t)off, b1, b1, b2, b2);
rcRet = RTEXITCODE_FAILURE;
cMismatches++;
if (cMismatches > 128)
{
printErr("Too many mismatches, giving up\n");
return rcRet;
}
}
off++;
}
if (!feof(pFile1) || !feof(pFile2))
{
if (!feof(pFile1) && ferror(pFile1))
rcRet = printErr("Read error on file #1.\n");
else if (!feof(pFile2) && ferror(pFile2))
rcRet = printErr("Read error on file #2.\n");
else if (!feof(pFile2))
rcRet = printErr("0x%x%08x: file #1 ends before file #2\n", (uint32_t)(off >> 32), (uint32_t)off);
else
rcRet = printErr("0x%x%08x: file #2 ends before file #1\n", (uint32_t)(off >> 32), (uint32_t)off);
}
return rcRet;
}
int main(int argc, char *argv[])
{
RTEXITCODE rcExit;
if (argc == 3)
{
const char *pszFile1 = argv[1];
const char *pszFile2 = argv[2];
FILE *pFile1 = openFile(pszFile1);
FILE *pFile2 = openFile(pszFile2);
rcExit = compareFiles(pFile1, pFile2);
if (pFile1)
fclose(pFile1);
if (pFile2)
fclose(pFile2);
}
else
rcExit = printErr("Syntax error: usage: VBoxCmp <file1> <file2>\n");
return rcExit;
}
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