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PhotoRec: update csectDir checks

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This commit is contained in:
Christophe Grenier 2012-06-27 08:56:19 +02:00
parent 80bb3584c5
commit 9fcfd1910f
2 changed files with 12 additions and 10 deletions
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14
src/file_doc.c
View file

@ -302,15 +302,17 @@ static int header_check_doc(const unsigned char *buffer, const unsigned int buff
const struct OLE_HDR *header=(const struct OLE_HDR *)buffer;
if(le16(header->reserved)!=0 || le32(header->reserved1)!=0)
return 0;
/* max file have reserved2=1
* qbb file have reserved2=4 */
if(le32(header->reserved2)!=0 && le32(header->reserved2)!=1 && le32(header->reserved2)!=4)
return 0;
if(le16(header->uMiniSectorShift)!=6)
return 0;
/* max and qbb file have uSectorShift=12 */
if(le16(header->uSectorShift)!=9 && le16(header->uSectorShift)!=12)
return 0;
if(le16(header->uSectorShift)==9 && le32(header->csectDir)!=0)
return 0;
/* max file have csectDir=1
* qbb file have csectDir=4 */
if(le16(header->uSectorShift)==12 && le32(header->csectDir)==0)
return 0;
/*
num_FAT_blocks=109+num_extra_FAT_blocks*(512-1);
maximum file size is 512+(num_FAT_blocks*128)*512, about 1.6GB
@ -501,7 +503,7 @@ static uint32_t *OLE_load_MiniFAT(FILE *IN, const struct OLE_HDR *header, const
return NULL;
minifat=(uint32_t*)MALLOC(le32(header->csectMiniFat) << le16(header->uSectorShift));
minifat_pos=(unsigned char*)minifat;
block=le32(header->dir_flag);
block=le32(header->MiniFat_block);
for(i=0; i < le32(header->csectMiniFat) && block < fat_entries; i++)
{
if(fseek(IN, ((uint64_t)block << le16(header->uSectorShift)) + 512, SEEK_SET) < 0)
@ -751,7 +753,7 @@ static void file_rename_doc(const char *old_filename)
if(le16(header->uSectorShift)==12)
{
fclose(file);
if(le32(header->reserved2)==1)
if(le32(header->csectDir)==1)
file_rename(old_filename, NULL, 0, 0, "max", 1);
else
file_rename(old_filename, NULL, 0, 0, "qbb", 1);

8
src/ole.h
View file

@ -35,8 +35,8 @@
struct OLE_HDR
{
char magic[8]; /*0*/
char clsid[16]; /*8*/
char magic[8]; /*0*/
char clsid[16]; /*8*/
uint16_t uMinorVersion; /*24*/
uint16_t uDllVersion; /*26*/
uint16_t uByteOrder; /*28*/
@ -44,12 +44,12 @@ struct OLE_HDR
uint16_t uMiniSectorShift; /*32*/
uint16_t reserved; /*34*/
uint32_t reserved1; /*36*/
uint32_t reserved2; /*40*/
uint32_t csectDir; /*40 Number of sectors in directory chains for 4KB sectors */
uint32_t num_FAT_blocks; /*44*/
uint32_t root_start_block; /*48*/
uint32_t dfsignature; /*52*/
uint32_t miniSectorCutoff; /*56*/
uint32_t dir_flag; /*60 first sec in the mini fat chain*/
uint32_t MiniFat_block; /*60 first sec in the mini fat chain*/
uint32_t csectMiniFat; /*64 number of sectors in the minifat */
uint32_t FAT_next_block; /*68*/
uint32_t num_extra_FAT_blocks; /*72*/