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fix bounds check

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This commit is contained in:
Ryan Oldenburg 2023-05-29 00:10:23 -05:00
parent 93ade8c889
commit 287d9bc80e
1 changed files with 2 additions and 3 deletions
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5
src/pixie/fileformats/ppm.nim
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@ -15,14 +15,13 @@ template failInvalid() =
proc decodeHeader( proc decodeHeader(
data: ptr UncheckedArray[uint8], len: int data: ptr UncheckedArray[uint8], len: int
): PpmHeader {.raises: [PixieError].} = ): PpmHeader {.raises: [PixieError].} =
if len <= 10: # Each part + whitespace
raise newException(PixieError, "Invalid PPM file header")
var var
commentMode, readWhitespace: bool commentMode, readWhitespace: bool
i, readFields: int i, readFields: int
field: string field: string
while readFields < 4: while readFields < 4:
if i >= len:
raise newException(PixieError, "Invalid PPM file header")
let c = data[i].char let c = data[i].char
if c == '#': if c == '#':
commentMode = true commentMode = true