I have the following byte array that I am casting to the struct below: ** I know it's not in the proper format here "0x80",
etc, but in my code it is.
unsigned char ReadBuffer[512] = { 80 00 00 00 50 00 00 00 01 00 40 00 00 00 01 00 00 00 00 00 00 00 00 00 FF F2 00 00 00 00 00 00 40 00 00 00 00 00 00 00 00 00 30 0F 00 00 00 00 00 00 30 0F 00 00 00 00 00 00 30 0F 00 00 00 00 33 20 C8 00 00 00 0C 42 E0 2A 0F 9F B9 00 00 FF}
typedef struct MFT_ATTRIBUTE {
DWORD dwType;
DWORD dwFullLength;
BYTE uchNonResFlag;
BYTE uchNameLength;
WORD wNameOffset;
WORD wFlags;
WORD wID;
LONG n64StartVCN;
LONG n64EndVCN;
WORD wDatarunOffset;
WORD wCompressionSize;
BYTE uchPadding[4];
LONGLONG n64AllocSize;
LONGLONG n64RealSize;
LONGLONG n64StreamSize;
} MFT_ATTRIBUTE, *P_MFT_ATTRIBUTE;
MFT_ATTRIBUTE* mft_attribute = (MFT_ATTRIBUTE*)ReadBuffer[0];
When I try to print the members, for some reason I get the some kind of incremental values:
printf("%x ",&mft_attribute->dwType);
printf("%x ",&mft_attribute->dwFullLength);
printf("%x ",&mft_attribute->uchNonResFlag);
printf("%x ",&mft_attribute->uchNameLength);
Output:
0x80 0x84 0x88 0x89
Can someone help me clarify this?
You are printing addresses, not values. That's why the output is increasing this way:
dwType
Remove the & before mft_attribute in your output code:
printf("%x ", mft_attribute->dwType);
printf("%x ", mft_attribute->dwFullLength);
printf("%x ", mft_attribute->uchNonResFlag);
printf("%x ", mft_attribute->uchNameLength);
You are casting the first element of the array to a pointer to your struct.
MFT_ATTRIBUTE* mft_attribute = (MFT_ATTRIBUTE*)ReadBuffer[0];
You want to cast a pointer to the first element :
MFT_ATTRIBUTE* mft_attribute = (MFT_ATTRIBUTE*) (ReadBuffer + 0);
Also as @Wolf pointed out this prints pointers not values pointed to:
printf("%x ",&mft_attribute->dwType);
You need instead
printf("%x ", mft_attribute->dwType);
Change your cast to the following:
MFT_ATTRIBUTE* mft_attribute = (MFT_ATTRIBUTE*)&ReadBuffer[0];
or to
MFT_ATTRIBUTE* mft_attribute = (MFT_ATTRIBUTE*)ReadBuffer;
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