Author: tilman
Date: Wed Oct 1 10:15:07 2025
New Revision: 1928880
Log:
PDFBOX-6080: follow /EndOfLine setting if it exists, use heuristics from
twelvemonkeys if not
Modified:
pdfbox/branches/2.0/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
Modified:
pdfbox/branches/2.0/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
==============================================================================
---
pdfbox/branches/2.0/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
Wed Oct 1 10:15:03 2025 (r1928879)
+++
pdfbox/branches/2.0/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
Wed Oct 1 10:15:07 2025 (r1928880)
@@ -68,29 +68,39 @@ final class CCITTFaxFilter extends Filte
long tiffOptions = 0;
if (k == 0)
{
- type = TIFFExtension.COMPRESSION_CCITT_T4; // Group 3 1D
- byte[] streamData = new byte[20];
- int bytesRead = encoded.read(streamData);
- if (bytesRead == -1)
+ if (decodeParms.containsKey(COSName.END_OF_LINE))
{
- throw new IOException("EOF while reading CCITT header");
+ // PDFBOX-6080: respect the parameter if it exists
+ boolean hasEndOfLine =
decodeParms.getBoolean(COSName.END_OF_LINE, false);
+ type = hasEndOfLine ? TIFFExtension.COMPRESSION_CCITT_T4 :
TIFFExtension.COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE;
}
- PushbackInputStream pushbackInputStream = new
PushbackInputStream(encoded, streamData.length);
- pushbackInputStream.unread(streamData, 0, bytesRead);
- encoded = pushbackInputStream;
- if (streamData[0] != 0 || (streamData[1] >> 4 != 1 &&
streamData[1] != 1))
+ else
{
- // leading EOL (0b000000000001) not found, search further and
try RLE if not
- // found
- type = TIFFExtension.COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE;
- short b = (short) (((streamData[0] << 8) + (streamData[1] &
0xff)) >> 4);
- for (int i = 12; i < bytesRead * 8; i++)
+ // In twelvemonkeys, this part is found in
CCITTFaxDecoderStream.findCompressionType()
+ // needed for 015315-p8-ccitt.pdf, PDFBOX-2123-1bit.pdf,
PDFBOX-2778.pdf
+ type = TIFFExtension.COMPRESSION_CCITT_T4; // Group 3 1D
+ byte[] streamData = new byte[20];
+ int bytesRead = encoded.read(streamData);
+ if (bytesRead == -1)
{
- b = (short) ((b << 1) + ((streamData[(i / 8)] >> (7 - (i %
8))) & 0x01));
- if ((b & 0xFFF) == 1)
+ throw new IOException("EOF while reading CCITT header");
+ }
+ PushbackInputStream pushbackInputStream = new
PushbackInputStream(encoded, streamData.length);
+ pushbackInputStream.unread(streamData, 0, bytesRead);
+ encoded = pushbackInputStream;
+ if (streamData[0] != 0 || (streamData[1] >> 4 != 1 &&
streamData[1] != 1))
+ {
+ // leading EOL (0b000000000001) not found, search further
and try RLE if not found
+ type =
TIFFExtension.COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE;
+ short b = (short) (((streamData[0] << 8) + (streamData[1]
& 0xff)) >> 4);
+ for (int i = 12; i < bytesRead * 8; i++)
{
- type = TIFFExtension.COMPRESSION_CCITT_T4;
- break;
+ b = (short) ((b << 1) + ((streamData[(i / 8)] >> (7 -
(i % 8))) & 0x01));
+ if ((b & 0xFFF) == 1)
+ {
+ type = TIFFExtension.COMPRESSION_CCITT_T4;
+ break;
+ }
}
}
}
