File: read-pam

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pypng 0.20220715.0-1
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#!/bin/sh

# Test that pripamtopng can read a true PAM file.
# It is not a very comprehensive test, it merely
# tests that pripamtopng generates the correct
# IHDR chunk.

PATH=${PWD%code*}code:$PATH

apamfile () {
  printf 'P7\n'
  printf 'WIDTH 3\nHEIGHT 1\nDEPTH 4\nMAXVAL 255\nTUPLTYPE RGB_ALPHA\n'
  printf 'ENDHDR\n'
  printf '\377\0\0\377\0\377\0\170\0\0\377\36'
}

apamfile |
  pripamtopng - |
  pripnglsch - |
  grep -q 'IHDR.*00000003000000010806000000'