1 | /* $Id: VBoxCmp.cpp 56310 2015-06-09 22:36:56Z 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) 2006-2015 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 |
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19 | /*******************************************************************************
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20 | * Header Files *
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21 | *******************************************************************************/
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22 | #include <sys/types.h>
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23 | #include <sys/stat.h>
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24 | #include <stdio.h>
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25 | #include <stdlib.h>
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26 | #include <errno.h>
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27 |
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28 | #include <iprt/string.h>
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29 | #include <iprt/stdarg.h>
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30 |
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31 |
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32 | /**
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33 | * Writes an error message.
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34 | *
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35 | * @returns RTEXITCODE_FAILURE.
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36 | * @param pcszFormat Error message.
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37 | * @param ... Format argument referenced in the message.
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38 | */
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39 | static RTEXITCODE printErr(const char *pcszFormat, ...)
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40 | {
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41 | va_list va;
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42 |
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43 | fprintf(stderr, "VBoxCmp: ");
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44 | va_start(va, pcszFormat);
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45 | vfprintf(stderr, pcszFormat, va);
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46 | va_end(va);
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47 |
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48 | return RTEXITCODE_FAILURE;
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49 | }
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50 |
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51 |
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52 | static FILE *openFile(const char *pszFile)
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53 | {
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54 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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55 | FILE *pFile = fopen(pszFile, "rb");
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56 | #else
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57 | FILE *pFile = fopen(pszFile, "r");
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58 | #endif
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59 | if (!pFile)
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60 | printErr("Failed to open '%s': %s\n", pszFile, strerror(errno));
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61 | return pFile;
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62 | }
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63 |
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64 |
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65 | static RTEXITCODE compareFiles(FILE *pFile1, FILE *pFile2)
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66 | {
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67 | if (!pFile1 || !pFile2)
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68 | return RTEXITCODE_FAILURE;
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69 |
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70 | uint32_t cMismatches = 1;
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71 | RTEXITCODE rcRet = RTEXITCODE_SUCCESS;
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72 | uint64_t off = 0;
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73 | for (;;)
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74 | {
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75 | uint8_t b1;
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76 | size_t cb1 = fread(&b1, sizeof(b1), 1, pFile1);
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77 | uint8_t b2;
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78 | size_t cb2 = fread(&b2, sizeof(b2), 1, pFile2);
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79 | if (cb1 != 1 || cb2 != 1)
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80 | break;
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81 | if (b1 != b2)
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82 | {
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83 | printErr("0x%x%08x: %#04x (%3d) != %#04x (%3d)\n", (uint32_t)(off >> 32), (uint32_t)off, b1, b1, b2, b2);
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84 | rcRet = RTEXITCODE_FAILURE;
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85 | cMismatches++;
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86 | if (cMismatches > 128)
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87 | {
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88 | printErr("Too many mismatches, giving up\n");
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89 | return rcRet;
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90 | }
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91 | }
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92 | off++;
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93 | }
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94 |
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95 | if (!feof(pFile1) || !feof(pFile2))
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96 | {
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97 | if (!feof(pFile1) && ferror(pFile1))
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98 | rcRet = printErr("Read error on file #1.\n");
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99 | else if (!feof(pFile2) && ferror(pFile2))
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100 | rcRet = printErr("Read error on file #2.\n");
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101 | else if (!feof(pFile2))
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102 | rcRet = printErr("0x%x%08x: file #1 ends before file #2\n", (uint32_t)(off >> 32), (uint32_t)off);
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103 | else
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104 | rcRet = printErr("0x%x%08x: file #2 ends before file #1\n", (uint32_t)(off >> 32), (uint32_t)off);
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105 | }
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106 |
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107 | return rcRet;
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108 | }
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109 |
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110 |
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111 | int main(int argc, char *argv[])
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112 | {
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113 | RTEXITCODE rcExit;
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114 |
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115 | if (argc == 3)
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116 | {
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117 | const char *pszFile1 = argv[1];
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118 | const char *pszFile2 = argv[2];
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119 | FILE *pFile1 = openFile(pszFile1);
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120 | FILE *pFile2 = openFile(pszFile2);
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121 | rcExit = compareFiles(pFile1, pFile2);
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122 | if (pFile1)
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123 | fclose(pFile1);
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124 | if (pFile2)
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125 | fclose(pFile2);
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126 | }
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127 | else
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128 | rcExit = printErr("Syntax error: usage: VBoxCmp <file1> <file2>\n");
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129 | return rcExit;
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130 | }
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131 |
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