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ensure we only ever see one sof

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Ryan Oldenburg 2022-06-08 20:04:18 -05:00
parent 5e6103fbc0
commit bd57f72f39
1 changed files with 5 additions and 0 deletions
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5
src/pixie/fileformats/jpeg.nim
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@ -68,6 +68,7 @@ type
len, pos: int len, pos: int
bitsBuffered: int bitsBuffered: int
bitBuffer: uint32 bitBuffer: uint32
foundSOF: bool
imageHeight, imageWidth: int imageHeight, imageWidth: int
progressive: bool progressive: bool
quantizationTables: array[4, array[64, uint8]] quantizationTables: array[4, array[64, uint8]]
@ -243,6 +244,10 @@ proc decodeDHT(state: var DecoderState) =
proc decodeSOF0(state: var DecoderState) = proc decodeSOF0(state: var DecoderState) =
## Decode start of Frame ## Decode start of Frame
if state.foundSOF:
failInvalid()
state.foundSOF = true
var len = state.readUint16be().int - 2 var len = state.readUint16be().int - 2
let precision = state.readUint8() let precision = state.readUint8()