Reject DG2 images unless FAC header matches - #279
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The ISO 19794-5 'FAC\0' check used &&, so it only failed when every header byte was wrong. Require all four bytes and a minimum length.
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DG2 ISO 19794-5 header validation used
&&, so it only threw when every one ofF,A,C,0x00was wrong. A single-byte mismatch was accepted.The check now requires all four bytes, plus a minimum length of 4.
testDatagroup2RejectsInvalidFACHeadercovers aFAC\x01header.