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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "servicebase.hxx"
#include "windowsHelper.hxx"
// Shared code between applications and updater.exe
/**
* Verifies if 2 files are byte for byte equivalent.
*
* @param file1Path The first file to verify.
* @param file2Path The second file to verify.
* @param sameContent Out parameter, TRUE if the files are equal
* @return TRUE If there was no error checking the files.
*/
BOOL
VerifySameFiles(LPCWSTR file1Path, LPCWSTR file2Path, BOOL &sameContent)
{
sameContent = FALSE;
AutoHandle file1(CreateFileW(file1Path, GENERIC_READ, FILE_SHARE_READ,
nullptr, OPEN_EXISTING, 0, nullptr));
if (file1 == INVALID_HANDLE_VALUE)
{
return FALSE;
}
AutoHandle file2(CreateFileW(file2Path, GENERIC_READ, FILE_SHARE_READ,
nullptr, OPEN_EXISTING, 0, nullptr));
if (file2 == INVALID_HANDLE_VALUE)
{
return FALSE;
}
DWORD fileSize1 = GetFileSize(file1.get(), nullptr);
DWORD fileSize2 = GetFileSize(file2.get(), nullptr);
if (INVALID_FILE_SIZE == fileSize1 || INVALID_FILE_SIZE == fileSize2)
{
return FALSE;
}
if (fileSize1 != fileSize2)
{
// sameContent is already set to FALSE
return TRUE;
}
char buf1[COMPARE_BLOCKSIZE];
char buf2[COMPARE_BLOCKSIZE];
DWORD numBlocks = fileSize1 / COMPARE_BLOCKSIZE;
DWORD leftOver = fileSize1 % COMPARE_BLOCKSIZE;
DWORD readAmount;
for (DWORD i = 0; i < numBlocks; i++)
{
if (!ReadFile(file1.get(), buf1, COMPARE_BLOCKSIZE, &readAmount, nullptr) ||
readAmount != COMPARE_BLOCKSIZE)
{
return FALSE;
}
if (!ReadFile(file2.get(), buf2, COMPARE_BLOCKSIZE, &readAmount, nullptr) ||
readAmount != COMPARE_BLOCKSIZE)
{
return FALSE;
}
if (memcmp(buf1, buf2, COMPARE_BLOCKSIZE))
{
// sameContent is already set to FALSE
return TRUE;
}
}
if (leftOver)
{
if (!ReadFile(file1.get(), buf1, leftOver, &readAmount, nullptr) ||
readAmount != leftOver)
{
return FALSE;
}
if (!ReadFile(file2.get(), buf2, leftOver, &readAmount, nullptr) ||
readAmount != leftOver)
{
return FALSE;
}
if (memcmp(buf1, buf2, leftOver))
{
// sameContent is already set to FALSE
return TRUE;
}
}
sameContent = TRUE;
return TRUE;
}
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