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This commit is contained in:
Ryan Oldenburg 2022-05-25 22:17:50 -05:00
parent b1d111d1bf
commit 583c797b40
1 changed files with 11 additions and 11 deletions
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22
src/pixie/fileformats/jpeg.nim
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@ -533,6 +533,17 @@ proc getBit(state: var DecoderState): int =
state.bitBuffer = state.bitBuffer shl 1 state.bitBuffer = state.bitBuffer shl 1
dec state.bitsBuffered dec state.bitsBuffered
proc getBits(state: var DecoderState, n: int): int =
## Get n number of bits as a unsigned integer.
if n notin 0 .. 16:
failInvalid()
if state.bitsBuffered < n:
state.fillBitBuffer()
let k = lrot(state.bitBuffer, n)
state.bitBuffer = k and (not bitMasks[n])
result = (k and bitMasks[n]).int
state.bitsBuffered -= n
proc getBitsAsSignedInt(state: var DecoderState, n: int): int = proc getBitsAsSignedInt(state: var DecoderState, n: int): int =
## Get n number of bits as a signed integer. ## Get n number of bits as a signed integer.
# TODO: Investigate why 15 not 16? # TODO: Investigate why 15 not 16?
@ -547,17 +558,6 @@ proc getBitsAsSignedInt(state: var DecoderState, n: int): int =
state.bitsBuffered -= n state.bitsBuffered -= n
result = k.int + (biases[n] and (not sign)) result = k.int + (biases[n] and (not sign))
proc getBits(state: var DecoderState, n: int): int =
## Get n number of bits as a unsigned integer.
if n notin 0 .. 16:
failInvalid()
if state.bitsBuffered < n:
state.fillBitBuffer()
let k = lrot(state.bitBuffer, n)
state.bitBuffer = k and (not bitMasks[n])
result = (k and bitMasks[n]).int
state.bitsBuffered -= n
proc decodeRegularBlock( proc decodeRegularBlock(
state: var DecoderState, component: int, data: var array[64, int16] state: var DecoderState, component: int, data: var array[64, int16]
) = ) =