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DataBinary's subtype ByteArray alone has an extra length

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ByteArray has the extra length, aparently as a historical artifact,
requiring it to be special cased.

Thanks to Mathias Stearn for pointing this out!
This commit is contained in:
Scott R. Parish 2010-03-10 20:34:53 -06:00
parent 697c370dea
commit 8e035fded4
1 changed files with 11 additions and 5 deletions
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16
Database/MongoDB/BSON.hs
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@ -156,11 +156,17 @@ getVal DataArray = do
getNull
return (fromIntegral bytes, BsonArray arr)
getVal DataBinary = do
skip 4
st <- getI8
len2 <- getI32
bs <- getLazyByteString $ fromIntegral len2
return (4 + 1 + 4 + fromIntegral len2, BsonBinary (toBinarySubType st) bs)
len1 <- getI32
st <- getI8
(len, hdrLen) <- if toBinarySubType st == BSTByteArray
then do
len2 <- getI32
assert (len1 - 4 == len2) $ return ()
return (len2, 4 + 1 + 4)
else return (len1, 4 + 1)
bs <- getLazyByteString $ fromIntegral len
return (hdrLen + fromIntegral len, BsonBinary (toBinarySubType st) bs)
getVal DataUndefined = return (1, BsonUndefined)
getVal DataOid = liftM ((,) 12 . BsonObjectId) $ getLazyByteString 12
getVal DataBoolean = liftM ((,) (1::Integer) . BsonBool . (/= (0::Int))) getI8