SLAMorris Final Thesis After Corrections.pdf - Cranfield University

Start of Record
87 F7 6A 62 4B 7B C1 36 02 80 00 08 FF FFFFFF00 B3 05 00
87 F7 6A 62 4B 7B C1 36 – Thumbnail Cache Record ID
02 80 00 08 – Flags denoting type of file
FF FFFFFF – Offset of subrecord in thumbcache_32.db
00 B3 05 00 – Offset of subrecord in thumbcache_96.db
C7 E6 02 00 FF FFFFFFFFFFFFFF
C7 E6 02 00 – Offset of subrecord in thumbcache_256.db
FF FFFFFF – Offset of subrecord in thumbcache_1024.db.db
FF FFFFFF – Offset of subrecord in thumbcache_sr.db
End of record
6.4.4 thumbcache_32, 96, 256 and 1024
The centralised thumbnail cache system implemented in Windows 7 allows for a
maximum of four differently sized images to be stored for each thumbnail
source file. If the thumbnail cache is used as intended the images stored are up
to a maximum of 32x32, 96x96, 256x256 and 1024x1024 pixels respectively.
Each of the four sizes has its own file into which subrecords are stored; the
structure of a subrecord can be divided into two separate sections: the header
and the image. The subrecord header section contains the metadata for the
subrecord and has a clearly defined structure. This is followed by the image
section which follows the standard structure for the image file type implemented
(JPEG, BMP or PNG image formats). The structure for the subrecord header is
defined in figure 6.4.
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