VeraCrypt
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-rw-r--r--src/Common/Format.c25
-rw-r--r--src/Common/Format.h1
2 files changed, 24 insertions, 2 deletions
diff --git a/src/Common/Format.c b/src/Common/Format.c
index 82c4df55..4aaf8b32 100644
--- a/src/Common/Format.c
+++ b/src/Common/Format.c
@@ -369,8 +369,13 @@ begin_format:
if (!volParams->hiddenVol && !bInstantRetryOtherFilesys)
{
LARGE_INTEGER volumeSize;
+ BOOL speedupFileCreation = FALSE;
volumeSize.QuadPart = dataAreaSize + TC_VOLUME_HEADER_GROUP_SIZE;
+ // speedup for file creation only makes sens when using quick format
+ if (volParams->quickFormat && volParams->fastCreateFile)
+ speedupFileCreation = TRUE;
+
if (volParams->sparseFileSwitch && volParams->quickFormat)
{
// Create as sparse file container
@@ -384,12 +389,28 @@ begin_format:
// Preallocate the file
if (!SetFilePointerEx (dev, volumeSize, NULL, FILE_BEGIN)
- || !SetEndOfFile (dev)
- || SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
+ || !SetEndOfFile (dev))
+ {
+ nStatus = ERR_OS_ERROR;
+ goto error;
+ }
+
+ if (speedupFileCreation)
+ {
+ // accelerate file creation by telling Windows not to fill all file content with zeros
+ // this has security issues since it will put existing disk content into file container
+ // We use this mechanism only when switch /fastCreateFile specific and when quick format
+ // also specified and which is documented to have security issues.
+ // we don't check returned status because failure is not issue for us
+ SetFileValidData (dev, volumeSize.QuadPart);
+ }
+
+ if (SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
{
nStatus = ERR_OS_ERROR;
goto error;
}
+
}
}
diff --git a/src/Common/Format.h b/src/Common/Format.h
index 961ece7c..4ce1b8c7 100644
--- a/src/Common/Format.h
+++ b/src/Common/Format.h
@@ -38,6 +38,7 @@ typedef struct
unsigned int clusterSize;
BOOL sparseFileSwitch;
BOOL quickFormat;
+ BOOL fastCreateFile;
DWORD sectorSize;
int *realClusterSize;
Password *password;