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This commit is contained in:
Ryan Oldenburg 2022-05-25 18:30:48 -05:00
parent 268e653b05
commit e67f257479
1 changed files with 14 additions and 6 deletions
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20
src/pixie/fileformats/jpeg.nim
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@ -110,15 +110,23 @@ proc readUint8(state: var DecoderState): uint8 =
proc readUint16be(state: var DecoderState): uint16 =
## Reads uint16 big-endian from the input stream.
(state.readUint8().uint16 shl 8) or state.readUint8()
if state.pos + 2 > state.len:
failInvalid()
result =
(state.buffer[state.pos].uint16 shl 8) or
state.buffer[state.pos + 1]
state.pos += 2
proc readUint32be(state: var DecoderState): uint32 =
## Reads uint32 big-endian from the input stream.
return
(state.readUint8().uint32 shl 24) or
(state.readUint8().uint32 shl 16) or
(state.readUint8().uint32 shl 8) or
state.readUint8().uint32
if state.pos + 4 > state.len:
failInvalid()
result =
(state.buffer[state.pos + 0].uint32 shl 24) or
(state.buffer[state.pos + 1].uint32 shl 16) or
(state.buffer[state.pos + 2].uint32 shl 8) or
state.buffer[state.pos + 3]
state.pos += 4
proc readStr(state: var DecoderState, n: int): string =
## Reads n number of bytes as a string.