Phtcache.bin: Difference between revisions

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-<pre>File header:
+== File Header ==
--00007: Header 1UJQ00_1
+{| class="wikitable" border="1"
--0000B: Number of pictures plus 1 (why?)
+|-
-C-00011: Unknown value (seems to be static?) B80B01000000
+! Offset
--00013: Total number of photos (excluding 2D dups)
+! Size
--00017: Appears to be file size. It's only 32 bits = 4GB max. A few hundred K
+! Description
-                larger than the actual size of every file in DCIM (?)
+|-
-                1607971 vs DCIM/100NIN = 1441792 vs DCIM = 147560 vs files = 1409024
+| 0x0
-                vs non-disk usage = 1224857
+| 0x8
-                phtcache non-disk = 456024, disk = 458752
+| Always "1UJQ00_1"
-                phtcache (non) + files (non) = 1680881 - 1607971 = 72910 = 72K hmm...
+|-
-                maybe the 72910 is some kind of checksum?
+| 0x8
-                ( I have no clue, all these notes were probably worthless)
+| 0x4
+| Number of Pictures + 1
+|-
+| 0xC
+| 0x2
+| Total number of photo entries(including unused entries) stored here, this is normally value 3000 (500 on NAND).
+|-
+| 0xE
+| 0x2
+| This u16 must be < 2, this is normally value 1 (0 for NAND).
+|-
+| 0x10
+| 0x2
+| Unknown, normally value zero.
+|-
+| 0x12
+| 0x2
+| Total number of photos(used entries), excluding 2D dups.
+|-
+| 0x14
+| 0x2
+| CRC16 over the entire file with this CRC field set to zero when calculating the CRC, with initialval=0 and polynomial=0xA001.
+|-
+| 0x16
+| 0x2
+| Size of this header, must be >=0x18(this is always value 0x18).
+|-
+| 0x18
+| 0x98 * Number of Pictures
+| Pictures Property, index refereed by 3DS Camera
+|}
-From 0x0018, one block per picture. Each block is 0x98 bytes long and formatted as such:
+The phtcache.bin actual filesize must be at least the following size: hdrsizefield + totalstoredentries*0x98.
--00003: Preferred image file format. Should be MPO\x00 or JPG\x00. The inner cam is the only
-                one that will yield JPG. 3D pictures are taken even with screen switched to 2D.
--0000B: Name of image
-C-00013: Subfolder of image
--0001B: Time taken based on "DS epoch" (start of 1/1/2000) (UNIX+946684800)
-C-00023: Time last viewed?
--00027: UNKNOWN
--0002B: UNKNOWN
-C-0002D: UNKNOWN
-E-0002F: UNKNOWN
--0003F: UNKNOWN
--00043: File size
-</pre>
+== Pictures Property ==
+{| class="wikitable" border="1"
+|-
+! Offset
+! Size
+! Description
+|-
+| 0x0
+| 0x04
+| Null-terminated file extension: MPO, JPG, or AVI.
+|-
+| 0x4
+| 0x8
+| Image file name, without the extension.
+|-
+| 0xC
+| 0x8
+| Directory name under the DCIM directory.
+|-
+| 0x14
+| 0x4
+| Time taken based on "DS epoch" (start of 1/1/2000) (UNIX+946684800)
+|-
+| 0x1C
+| 0x4
+| Time last viewed?
+|-
+| 0x24
+| 0x4
+| ?
+|-
+| 0x28
+| 0x4
+| ?
+|-
+| 0x2C
+| 0x4
+| ?
+|-
+| 0x30
+| 0x4
+| ?
+|-
+| 0x34
+| 0x4
+| ?
+|-
+| 0x38
+| 0x4
+| ?
+|-
+| 0x3C
+| 0x4
+| ?
+|-
+| 0x40
+| 0x4
+| File size
+|-
+| 0x50
+| 0x18*4
+| 4 blocks, where each block is 0x18-bytes.
+|}