fuzz jpg

tests/fuzz_jpg.nim

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+import random, strformat, pixie/fileformats/jpg, pixie/common
+
+randomize()
+
+let original = cast[seq[uint8]](readFile("tests/images/jpg/jpeg420exif.jpg"))
+
+for i in 0 ..< 10_000:
+  var data = original
+  let
+    pos = rand(data.len)
+    value = rand(255).uint8
+  data[pos] = value
+  echo &"{i} {pos} {value}"
+  try:
+    discard decodeJpg(data)
+  except PixieError:
+    discard