1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* $Id: VBoxCmp.cpp $ */
/** @file
* File Compare - Compares two files byte by byte.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* 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;
}
|
