forked from mirrors/gecko-dev
e226046cb8
# ignore-this-changeset Depends on D28954 Differential Revision: https://phabricator.services.mozilla.com/D28956 --HG-- extra : moz-landing-system : lando
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "servicebase.h"
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#include "nsWindowsHelpers.h"
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// Shared code between applications and updater.exe
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#include "nsWindowsRestart.cpp"
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/**
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* Verifies if 2 files are byte for byte equivalent.
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*
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* @param file1Path The first file to verify.
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* @param file2Path The second file to verify.
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* @param sameContent Out parameter, TRUE if the files are equal
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* @return TRUE If there was no error checking the files.
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*/
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BOOL VerifySameFiles(LPCWSTR file1Path, LPCWSTR file2Path, BOOL& sameContent) {
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sameContent = FALSE;
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nsAutoHandle file1(CreateFileW(file1Path, GENERIC_READ, FILE_SHARE_READ,
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nullptr, OPEN_EXISTING, 0, nullptr));
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if (INVALID_HANDLE_VALUE == file1) {
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return FALSE;
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}
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nsAutoHandle file2(CreateFileW(file2Path, GENERIC_READ, FILE_SHARE_READ,
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nullptr, OPEN_EXISTING, 0, nullptr));
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if (INVALID_HANDLE_VALUE == file2) {
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return FALSE;
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}
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DWORD fileSize1 = GetFileSize(file1, nullptr);
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DWORD fileSize2 = GetFileSize(file2, nullptr);
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if (INVALID_FILE_SIZE == fileSize1 || INVALID_FILE_SIZE == fileSize2) {
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return FALSE;
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}
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if (fileSize1 != fileSize2) {
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// sameContent is already set to FALSE
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return TRUE;
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}
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char buf1[COMPARE_BLOCKSIZE];
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char buf2[COMPARE_BLOCKSIZE];
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DWORD numBlocks = fileSize1 / COMPARE_BLOCKSIZE;
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DWORD leftOver = fileSize1 % COMPARE_BLOCKSIZE;
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DWORD readAmount;
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for (DWORD i = 0; i < numBlocks; i++) {
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if (!ReadFile(file1, buf1, COMPARE_BLOCKSIZE, &readAmount, nullptr) ||
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readAmount != COMPARE_BLOCKSIZE) {
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return FALSE;
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}
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if (!ReadFile(file2, buf2, COMPARE_BLOCKSIZE, &readAmount, nullptr) ||
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readAmount != COMPARE_BLOCKSIZE) {
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return FALSE;
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}
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if (memcmp(buf1, buf2, COMPARE_BLOCKSIZE)) {
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// sameContent is already set to FALSE
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return TRUE;
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}
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}
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if (leftOver) {
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if (!ReadFile(file1, buf1, leftOver, &readAmount, nullptr) ||
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readAmount != leftOver) {
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return FALSE;
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}
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if (!ReadFile(file2, buf2, leftOver, &readAmount, nullptr) ||
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readAmount != leftOver) {
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return FALSE;
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}
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if (memcmp(buf1, buf2, leftOver)) {
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// sameContent is already set to FALSE
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return TRUE;
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}
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}
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sameContent = TRUE;
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return TRUE;
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}
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