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Fill out some more details on property blocks.

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This commit is contained in:
James Ahlborn 2011-03-29 23:15:19 -04:00
parent a07e2a1f87
commit cadbc749b0
1 changed files with 14 additions and 6 deletions
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20
HACKING
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@ -753,20 +753,28 @@ They start with a 32 bits header: 'KKD\0' in Jet3 and 'MR2\0' in Jet 4.
Next come chunks. Each chunk starts with: Next come chunks. Each chunk starts with:
32 bits length value (this includes the length) 32 bits length value (this includes the length)
16 bits chunk type (0x00 0x80 contains the names, 0x00 0x00 and 0x00 0x01 contain 16 bits chunk type (0x0080 contains the names, 0x0000 and 0x0001 contain
the values) the values. 0x0000 seems to contain information about the "main" object,
e.g. the table, and 0x0001 seems to contain information about other
objects, e.g. the table columns)
Name chunks (0x00 0x80) simply contains occurences of: Name chunk blocks (0x0080) simply contain occurences of:
16 bit name length 16 bit name length
name name
For instance: For instance:
0x0d 0x00 and 'AccessVersion' (AccessVersion is 13 bytes, 0x0d 0x00 intel order) 0x0d 0x00 and 'AccessVersion' (AccessVersion is 13 bytes, 0x0d 0x00 intel order)
Next comes one of more chunk of data: Value chunk blocks (0x0000 and 0x0001) contain a header:
32 bits length value (this includes the length)
16 bits name length
name (0x0000 chunk blocks are not usually named, 0x0001 chunk blocks have the
column name to which the properties belong)
Next comes one of more chunks of data:
16 bit length value (this includes the length) 16 bit length value (this includes the length)
8 bit unknown flag
8 bit type 8 bit type
16 bit name (index in the name array of above chunk 0x00 0x80) 16 bit name (index in the name array of above chunk 0x0080)
16 bit length field (non-inclusive) 16 bit value length field (non-inclusive)
value (07.53 for the AccessVersion example above) value (07.53 for the AccessVersion example above)
See props.c for an example. See props.c for an example.