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findCompressionType always uses RLE if leading EOL is missing (#657)

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Update of the last read byte is missing since the last update. So if only the first EOL is missing, further EOLs after the lines are not detected.
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Oliver Schmidtmer 2022-01-15 00:21:47 +01:00 committed by GitHub
parent 7e0d8922da
commit ac8a36db1c
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2 changed files with 15 additions and 0 deletions
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1
imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/CCITTFaxDecoderStream.java
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@ -170,6 +170,7 @@ final class CCITTFaxDecoderStream extends FilterInputStream {
// no EOL before stream end
return TIFFBaseline.COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE;
}
streamByte = (byte) read;
}
b = (short) ((b << 1) + ((streamByte >> (7 - (i % 8))) & 0x01));

14
imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/CCITTFaxDecoderStreamTest.java
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@ -363,6 +363,20 @@ public class CCITTFaxDecoderStreamTest {
}
}
@Test
public void testFindCompressionTypeForMissingStartEOL() throws IOException {
// Type 4, missing leading EOL code
// starts with 1728px long white lines
byte[] data = new byte[]{
0x4d, (byte) 0x9a, (byte) 0x80, 0x01, 0x4d, (byte) 0x9a, (byte) 0x80, 0x01, 0x4d, (byte) 0x9a, (byte) 0x80, 0x01, 0x4d, (byte) 0x9a, (byte) 0x80, 0x01,
(byte) 0x91, 0x3c, 0x17, 0x6d, 0x02, (byte) 0xf2, (byte) 0xb0, 0x20, (byte) 0x01, (byte) 0xda, (byte) 0xa8, (byte) 0xb3, 0x17, 0x4e, 0x62, (byte) 0xcd, (byte) 0xa7
};
try (ByteArrayInputStream is = new ByteArrayInputStream(data)) {
int detectedType = CCITTFaxDecoderStream.findCompressionType(TIFFExtension.COMPRESSION_CCITT_T4, is);
assertEquals(TIFFExtension.COMPRESSION_CCITT_T4, detectedType);
}
}
private InputStream getResourceAsStream(String name) {
return getClass().getResourceAsStream(name);
}