The Tor Browser / file comparison
comparison: toolkit/components/maintenanceservice/servicebase.cpp
toolkit/components/maintenanceservice/servicebase.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:adf0df374224 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "servicebase.h" | |
| 6 #include "nsWindowsHelpers.h" | |
| 7 | |
| 8 // Shared code between applications and updater.exe | |
| 9 #include "nsWindowsRestart.cpp" | |
| 10 | |
| 11 /** | |
| 12 * Verifies if 2 files are byte for byte equivalent. | |
| 13 * | |
| 14 * @param file1Path The first file to verify. | |
| 15 * @param file2Path The second file to verify. | |
| 16 * @param sameContent Out parameter, TRUE if the files are equal | |
| 17 * @return TRUE If there was no error checking the files. | |
| 18 */ | |
| 19 BOOL | |
| 20 VerifySameFiles(LPCWSTR file1Path, LPCWSTR file2Path, BOOL &sameContent) | |
| 21 { | |
| 22 sameContent = FALSE; | |
| 23 nsAutoHandle file1(CreateFileW(file1Path, GENERIC_READ, FILE_SHARE_READ, | |
| 24 nullptr, OPEN_EXISTING, 0, nullptr)); | |
| 25 if (INVALID_HANDLE_VALUE == file1) { | |
| 26 return FALSE; | |
| 27 } | |
| 28 nsAutoHandle file2(CreateFileW(file2Path, GENERIC_READ, FILE_SHARE_READ, | |
| 29 nullptr, OPEN_EXISTING, 0, nullptr)); | |
| 30 if (INVALID_HANDLE_VALUE == file2) { | |
| 31 return FALSE; | |
| 32 } | |
| 33 | |
| 34 DWORD fileSize1 = GetFileSize(file1, nullptr); | |
| 35 DWORD fileSize2 = GetFileSize(file2, nullptr); | |
| 36 if (INVALID_FILE_SIZE == fileSize1 || INVALID_FILE_SIZE == fileSize2) { | |
| 37 return FALSE; | |
| 38 } | |
| 39 | |
| 40 if (fileSize1 != fileSize2) { | |
| 41 // sameContent is already set to FALSE | |
| 42 return TRUE; | |
| 43 } | |
| 44 | |
| 45 char buf1[COMPARE_BLOCKSIZE]; | |
| 46 char buf2[COMPARE_BLOCKSIZE]; | |
| 47 DWORD numBlocks = fileSize1 / COMPARE_BLOCKSIZE; | |
| 48 DWORD leftOver = fileSize1 % COMPARE_BLOCKSIZE; | |
| 49 DWORD readAmount; | |
| 50 for (DWORD i = 0; i < numBlocks; i++) { | |
| 51 if (!ReadFile(file1, buf1, COMPARE_BLOCKSIZE, &readAmount, nullptr) || | |
| 52 readAmount != COMPARE_BLOCKSIZE) { | |
| 53 return FALSE; | |
| 54 } | |
| 55 | |
| 56 if (!ReadFile(file2, buf2, COMPARE_BLOCKSIZE, &readAmount, nullptr) || | |
| 57 readAmount != COMPARE_BLOCKSIZE) { | |
| 58 return FALSE; | |
| 59 } | |
| 60 | |
| 61 if (memcmp(buf1, buf2, COMPARE_BLOCKSIZE)) { | |
| 62 // sameContent is already set to FALSE | |
| 63 return TRUE; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 if (leftOver) { | |
| 68 if (!ReadFile(file1, buf1, leftOver, &readAmount, nullptr) || | |
| 69 readAmount != leftOver) { | |
| 70 return FALSE; | |
| 71 } | |
| 72 | |
| 73 if (!ReadFile(file2, buf2, leftOver, &readAmount, nullptr) || | |
| 74 readAmount != leftOver) { | |
| 75 return FALSE; | |
| 76 } | |
| 77 | |
| 78 if (memcmp(buf1, buf2, leftOver)) { | |
| 79 // sameContent is already set to FALSE | |
| 80 return TRUE; | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 sameContent = TRUE; | |
| 85 return TRUE; | |
| 86 } |
