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crypt32: Use ReadFile rather than a memory-mapped file to check the type of a file.

This commit is contained in:
Juan Lang 2008-08-01 10:18:36 -07:00 committed by Alexandre Julliard
parent c03dfb8f50
commit 3f563c3d9b
1 changed files with 24 additions and 29 deletions
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53
dlls/crypt32/sip.c
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@ -1,6 +1,6 @@
/*
* Copyright 2002 Mike McCormack for CodeWeavers
* Copyright 2005 Juan Lang
* Copyright 2005-2008 Juan Lang
* Copyright 2006 Paul Vriens
*
* This library is free software; you can redistribute it and/or
@ -276,15 +276,15 @@ BOOL WINAPI CryptSIPRetrieveSubjectGuid
(LPCWSTR FileName, HANDLE hFileIn, GUID *pgSubject)
{
HANDLE hFile;
HANDLE hFilemapped;
LPVOID pMapped;
BOOL bRet = FALSE;
DWORD fileSize;
IMAGE_DOS_HEADER *dos;
DWORD count;
LARGE_INTEGER zero, oldPos;
/* FIXME, find out if there is a name for this GUID */
static const GUID unknown = { 0xC689AAB8, 0x8E78, 0x11D0, { 0x8C,0x47,0x00,0xC0,0x4F,0xC2,0x95,0xEE }};
static const GUID cabGUID = { 0xc689aaba, 0x8e78, 0x11d0, {0x8c,0x47,0x00,0xc0,0x4f,0xc2,0x95,0xee }};
static const WORD dosHdr = IMAGE_DOS_SIGNATURE;
static const BYTE cabHdr[] = { 'M','S','C','F' };
BYTE hdr[SIP_MAX_MAGIC_NUMBER];
TRACE("(%s %p %p)\n", wine_dbgstr_w(FileName), hFileIn, pgSubject);
@ -307,38 +307,33 @@ BOOL WINAPI CryptSIPRetrieveSubjectGuid
if (hFile == INVALID_HANDLE_VALUE) return FALSE;
}
hFilemapped = CreateFileMappingA(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
/* Last error is set by CreateFileMapping */
if (!hFilemapped) goto cleanup3;
zero.QuadPart = 0;
SetFilePointerEx(hFile, zero, &oldPos, FILE_CURRENT);
SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
if (!ReadFile(hFile, hdr, sizeof(hdr), &count, NULL))
goto cleanup;
pMapped = MapViewOfFile(hFilemapped, FILE_MAP_READ, 0, 0, 0);
/* Last error is set by MapViewOfFile */
if (!pMapped) goto cleanup2;
/* Native checks it right here */
fileSize = GetFileSize(hFile, NULL);
if (fileSize < 4)
if (count < SIP_MAX_MAGIC_NUMBER)
{
SetLastError(ERROR_INVALID_PARAMETER);
goto cleanup1;
goto cleanup;
}
/* As everything is in place now we start looking at the file header */
dos = (IMAGE_DOS_HEADER *)pMapped;
if (dos->e_magic == IMAGE_DOS_SIGNATURE)
if (!memcmp(hdr, &dosHdr, sizeof(dosHdr)))
{
*pgSubject = unknown;
SetLastError(S_OK);
bRet = TRUE;
goto cleanup1;
goto cleanup;
}
/* Quick-n-dirty check for a cab file. */
if (!memcmp(pMapped, cabHdr, sizeof(cabHdr)))
if (!memcmp(hdr, cabHdr, sizeof(cabHdr)))
{
*pgSubject = cabGUID;
SetLastError(S_OK);
bRet = TRUE;
goto cleanup1;
goto cleanup;
}
/* FIXME
@ -352,14 +347,14 @@ BOOL WINAPI CryptSIPRetrieveSubjectGuid
/* Let's set the most common error for now */
SetLastError(TRUST_E_SUBJECT_FORM_UNKNOWN);
/* The 3 different cleanups are here because we shouldn't overwrite the last error */
cleanup1:
UnmapViewOfFile(pMapped);
cleanup2:
CloseHandle(hFilemapped);
cleanup3:
/* If we didn't open this one we shouldn't close it (hFile is a copy) */
if (!hFileIn) CloseHandle(hFile);
cleanup:
/* If we didn't open this one we shouldn't close it (hFile is a copy),
* but we should reset the file pointer to its original position.
*/
if (!hFileIn)
CloseHandle(hFile);
else
SetFilePointerEx(hFile, oldPos, NULL, FILE_BEGIN);
return bRet;
}