| 1 | /* $Id: VBoxCmp.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * File Compare - Compares two files byte by byte.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #include <sys/types.h>
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| 33 | #include <sys/stat.h>
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| 34 | #include <stdio.h>
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| 35 | #include <stdlib.h>
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| 36 | #include <errno.h>
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| 37 |
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| 38 | #include <iprt/string.h>
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| 39 | #include <iprt/stdarg.h>
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * Writes an error message.
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| 44 | *
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| 45 | * @returns RTEXITCODE_FAILURE.
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| 46 | * @param pcszFormat Error message.
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| 47 | * @param ... Format argument referenced in the message.
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| 48 | */
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| 49 | static RTEXITCODE printErr(const char *pcszFormat, ...)
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| 50 | {
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| 51 | va_list va;
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| 52 |
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| 53 | fprintf(stderr, "VBoxCmp: ");
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| 54 | va_start(va, pcszFormat);
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| 55 | vfprintf(stderr, pcszFormat, va);
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| 56 | va_end(va);
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| 57 |
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| 58 | return RTEXITCODE_FAILURE;
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| 59 | }
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| 60 |
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| 61 |
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| 62 | static FILE *openFile(const char *pszFile)
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| 63 | {
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| 64 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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| 65 | FILE *pFile = fopen(pszFile, "rb");
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| 66 | #else
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| 67 | FILE *pFile = fopen(pszFile, "r");
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| 68 | #endif
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| 69 | if (!pFile)
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| 70 | printErr("Failed to open '%s': %s\n", pszFile, strerror(errno));
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| 71 | return pFile;
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| 72 | }
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| 73 |
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| 74 |
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| 75 | static RTEXITCODE compareFiles(FILE *pFile1, FILE *pFile2)
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| 76 | {
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| 77 | if (!pFile1 || !pFile2)
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| 78 | return RTEXITCODE_FAILURE;
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| 79 |
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| 80 | uint32_t cMismatches = 1;
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| 81 | RTEXITCODE rcRet = RTEXITCODE_SUCCESS;
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| 82 | uint64_t off = 0;
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| 83 | for (;;)
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| 84 | {
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| 85 | uint8_t b1;
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| 86 | size_t cb1 = fread(&b1, sizeof(b1), 1, pFile1);
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| 87 | uint8_t b2;
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| 88 | size_t cb2 = fread(&b2, sizeof(b2), 1, pFile2);
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| 89 | if (cb1 != 1 || cb2 != 1)
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| 90 | break;
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| 91 | if (b1 != b2)
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| 92 | {
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| 93 | printErr("0x%x%08x: %#04x (%3d) != %#04x (%3d)\n", (uint32_t)(off >> 32), (uint32_t)off, b1, b1, b2, b2);
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| 94 | rcRet = RTEXITCODE_FAILURE;
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| 95 | cMismatches++;
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| 96 | if (cMismatches > 128)
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| 97 | {
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| 98 | printErr("Too many mismatches, giving up\n");
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| 99 | return rcRet;
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| 100 | }
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| 101 | }
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| 102 | off++;
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| 103 | }
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| 104 |
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| 105 | if (!feof(pFile1) || !feof(pFile2))
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| 106 | {
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| 107 | if (!feof(pFile1) && ferror(pFile1))
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| 108 | rcRet = printErr("Read error on file #1.\n");
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| 109 | else if (!feof(pFile2) && ferror(pFile2))
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| 110 | rcRet = printErr("Read error on file #2.\n");
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| 111 | else if (!feof(pFile2))
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| 112 | rcRet = printErr("0x%x%08x: file #1 ends before file #2\n", (uint32_t)(off >> 32), (uint32_t)off);
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| 113 | else
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| 114 | rcRet = printErr("0x%x%08x: file #2 ends before file #1\n", (uint32_t)(off >> 32), (uint32_t)off);
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| 115 | }
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| 116 |
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| 117 | return rcRet;
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| 118 | }
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| 119 |
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| 120 |
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| 121 | int main(int argc, char *argv[])
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| 122 | {
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| 123 | RTEXITCODE rcExit;
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| 124 |
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| 125 | if (argc == 3)
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| 126 | {
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| 127 | const char *pszFile1 = argv[1];
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| 128 | const char *pszFile2 = argv[2];
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| 129 | FILE *pFile1 = openFile(pszFile1);
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| 130 | FILE *pFile2 = openFile(pszFile2);
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| 131 | rcExit = compareFiles(pFile1, pFile2);
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| 132 | if (pFile1)
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| 133 | fclose(pFile1);
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| 134 | if (pFile2)
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| 135 | fclose(pFile2);
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| 136 | }
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| 137 | else
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| 138 | rcExit = printErr("Syntax error: usage: VBoxCmp <file1> <file2>\n");
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| 139 | return rcExit;
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| 140 | }
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| 141 |
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