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/*
* AUTHOR
* N. Nielsen
*
* LICENSE
* This software is in the public domain.
*
* The software is provided "as is", without warranty of any kind,
* express or implied, including but not limited to the warranties
* of merchantability, fitness for a particular purpose, and
* noninfringement. In no event shall the author(s) be liable for any
* claim, damages, or other liability, whether in an action of
* contract, tort, or otherwise, arising from, out of, or in connection
* with the software or the use or other dealings in the software.
*
* SUPPORT
* Send bug reports to: <nielsen@memberwebs.com>
*/
#include "usuals.h"
#include "ntfs.h"
#include "malloc.h"
#include "string.h"
ntfs_attribheader* ntfs_searchattribute(byte* location, uint32 attrType, byte* end, bool skip)
{
/* Now we should be at attributes */
while((!end || (location + sizeof(ntfs_attribheader) < end)) &&
*((uint32*)location) != kNTFS_RecEnd)
{
ntfs_attribheader* attrib = (ntfs_attribheader*)location;
if(!skip)
{
if(attrib->type == attrType)
return attrib;
}
else
skip = false;
location += attrib->cbAttribute;
}
return NULL;
}
byte* ntfs_getattributelist(ntfs_recordheader* record)
{
byte* location = (byte*)record;
ASSERT(record->offAttrs != 0);
ASSERT(record->offAttrs < 0x100);
location += record->offAttrs;
return location;
}
ntfs_attribheader* ntfs_findattribute(ntfs_recordheader* record, uint32 attrType, byte* end)
{
byte* location = ntfs_getattributelist(record);
return ntfs_searchattribute(location, attrType, end, false);
}
ntfs_attribheader* ntfs_nextattribute(ntfs_attribheader* attrib, uint32 attrType, byte* end)
{
return ntfs_searchattribute((byte*)attrib, attrType, end, true);
}
byte* ntfs_getattributedata(ntfs_attribresident* attrib, byte* end)
{
byte* data = ((byte*)attrib) + attrib->offAttribData;
if(data > end)
return NULL;
return data;
}
bool ntfs_isbetternamespace(byte n1, byte n2)
{
/*
* We like our namespaces in this order
* 1. WIN32
* 2. WIN32/DOS
* 3. DOS
* 4. POSIX
*/
if(n1 == kNTFS_NameSpacePOSIX)
return true;
if(n1 == kNTFS_NameSpaceDOS &&
(n2 == kNTFS_NameSpaceWIN32 || n2 == kNTFS_NameSpaceWINDOS))
return true;
if(n1 == kNTFS_NameSpaceWINDOS &&
n2 == kNTFS_NameSpaceWIN32)
return true;
return false;
}
bool ntfs_dofixups(byte* cluster, uint32 size)
{
ntfs_recordheader* record = (ntfs_recordheader*)cluster;
byte numSectors;
uint16* updSeq;
uint16* sectorFooter;
byte i;
ASSERT(size % kSectorSize == 0);
numSectors = (byte)(size / kSectorSize);
/* Check the number of sectors against array */
if(record->cwUpdSeq - 1 < numSectors)
numSectors = record->cwUpdSeq - 1;
updSeq = (uint16*)(cluster + record->offUpdSeq);
for(i = 0; i < numSectors; i++)
{
/*
* Check last 2 bytes in each sector against
* first double byte value in update sequence
*/
sectorFooter = (uint16*)((cluster + (kSectorSize - 2)) + (i * kSectorSize));
if(*sectorFooter == updSeq[0])
*sectorFooter = updSeq[i + 1];
else
return false;
}
return true;
}
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