path: root/CHANGES-3.03

3.03 (2011-aug-15)
------------------
Added the "fixed pitch" text extraction mode.
Modified "pdftops -paper match" to handle PDF files with
  different-sized pages, i.e., it will now select the matching paper
  size on a page-by-page basis.
Add ability for pdftoppm to write to stdout.
Implemented 256-bit AES decryption.
Commented out the t1lib section in the configure script -- t1lib has
  some potential security holes, and hasn't been updated in years.
Redesigned the font configuration xpdfrc commands: removed the
  displayFontT1, displayFontTT, displayNamedCIDFontT1,
  displayCIDFontT1, displayNamedCIDFontTT, displayCIDFontTT, psFont,
  psNamedFont16, and psFont16 commands; added the fontFile,
  fontFileCC, psResidentFont, psResidentFont16, and psResidentFontCC
  commands.
Switched from GPLv2 to dual v2/v3 licensing.
Performance: cache tiling patterns.
Implemented text fills with pattern color spaces.
Rewrote the image and image mask rendering code to be more accurate
  and faster.
Fixed a bug in PDFCore that could sometimes cause crashes at high zoom
  levels.
Implemented embedded CMap streams.
Added the 'setSelection' command.
Added the 'rotateCCW' and 'rotateCW' commands.
Added the 'psFontPassthrough' xpdfrc command.
Added the 'launchCommand' xpdfrc command.
Implemented alpha-type soft masks.
Added "Form: AcroForm|XFA|none" to pdfinfo output.
Added support for image masks filled with pattern color spaces.
Text search wasn't finding all occurrences of a string on rotated pages
  (i.e., pages where the primary rotation, as displayed, was not
  horizontal).
Modified PSOutputDev so it always check for transparency; if Splash is
  not available, it now prints a warning.
Handle the blending color space for soft masks.
Added the disableFreeTypeHinting xpdfrc option.
Added the psAlwaysRasterize xpdfrc option.
Added support for transfer functions in the rasterizer.
Optimized the JPEG 2000 decoder to use less memory.
Do fill adjustment (similar to stroke adjustment) on simple
  rectangular fills.
Added the antialiasPrinting xpdfrc setting.
Added '%i', '%j', and '%k' (mouse pointer page and position) to the
  available options for the 'run' command.
Links with the underlined border style were being drawn with the lines
  over, instead of under, the text.
Add #include <aconf.h> to XPDFTree.cc (to avoid problems with certain
  compilers).
Change XRef::fetch() to avoid infinite loops caused by odd damage to
  the xref table (e.g., where a stream object's "Length" value is an
  indirect reference that points to another stream object).
Handle embedded fonts which are declared with the wrong font type,
  including 8-bit fonts declared as CID fonts and vice versa; this
  was causing various problems, including crashes and invalid
  PostScript output.
In text extractor, don't drop horizontally overlapping words onto a
  separate line.
The numbers in the operand to the TJ operator should be multiplied by
  the current horizontal scaling parameter.
Fixed a bug in the Type 1C-to-Type 1 font converter -- need to escape
  strings in the font dictionary.
The zero-font-size check in PSOutputDev.cc was broken.
Fixes for the form field appearance regeneration code: handle Unicode
  strings (by downconverting to Latin1); check for "True" in addition
  to "Yes" as a button value.
Modify XPDFTree to limit the widget height to 32767 pixels -- this
  avoids crashes with very large outlines.
Allow image mask decode arrays to be [1.0 0.0] in addition to [1 0].
Tweak the form field appearance regeneration code.
PSOutputDev now sets up resources for DR dictionaries in forms (in
  case the form field appearances are regenerated).
For TrueType fonts which are marked symbolic, the cmaps should be
  ignored.
Change the handling of numeric characters in Unicode text output --
  they are now treated as left-to-right, which isn't strictly correct,
  but does result in correct visual formatting.
Modify FoFiTrueType to handle bogus loca table entries where the
  offset is past the end of the glyf table.
Fixed shading pattern fills to do clipping and background fills
  correctly.
Change the code that reads the page tree to be more flexible with
  regard to improperly constructed trees.
Changed the PostScript header comment from "Produced by xpdf/pdftops
  x.yy" to "XpdfVersion: x.yy" to make it (mostly) DSC-compliant.
Fixed PSOutputDev to handle page rotation correctly where the PDF page
  is rotated 90 or 270 degrees and the page width (before rotation) is
  greater than its height (and vice versa for 0 or 180 degrees).
Unbalanced save/restores inside form XObjects (which can be happen in
  damaged or incorrectly constructed PDF files) could cause crashes.
The CCITTFax decoder could go into an infinite loop on certain types
  of corrupt input.
Added the "psUncompressPreloadedImages" xpdfrc command.
Escape newlines and other non-printable characters in the custom color
  DSC comments in PostScript output.
Added the tilingPatternFill and *ShadedFill functions to
  PreScanOutputDev to speed it up.
Too many elements in an image's Decode array should not be a fatal
  error.
Fixed a buffer overflow security hole in StreamPredictor.
Handle line dash arrays that start with a zero element correctly.
PreScanOutputDev was not correctly detecting all transparency - in
  some places, it was looking only at the blending mode, and not at
  the opacity setting.
Force halftone screen size to be a power of 2.  This allows optimizing
  the halftoning code.
Fixed a bug in the JBIG2 MMR decoder (and also in the CCITTFax
  decoder) that was causing array references with negative indexes.
Fixed a bug in the transparency code that was causing memory overruns.
Fixed a 64-bit bug in the ASCII85 encoder.
The focusToPageNum was crashing in full-screen mode - it should simply
  do nothing.
Added '%p' (current page number) to the available options for the 'run'
  command.
Tweak the behavior with PDF files that have pages of different widths
  in continuous mode: scroll horizontally to avoid blank space on the
  left side (when changing pages via entering a page number or
  clicking on a link).
A closepath followed by a lineto should create a new subpath for the
  lineto.
Fixed a buffer overflow in the CCITTFax decoder.
Adobe Acrobat appears to ignore the flatness setting when rasterizing
  curves, so Xpdf now does the same.  (Oddly, Acrobat passes the
  flatness setting through to PostScript output, which ends up making
  the PS file look different from the PDF file - so Xpdf continues to
  pass flatness through to PS files, too.)
Pdfimages now ignores tiling pattern fills (for performance reasons).
Fixed a bug in PDFCore that could sometimes cause crashes at high zoom
  levels.
Use std::sort (with functors) in place of qsort (if available) - this
  can be significantly faster.
Hitting "close" while Xpdf is in full-screen mode (with only one file
  open) was crashing.
Tweak the TrueType font encoding deciphering algorithm.
Rewrote the CCITTFax decoder inner loop - this fixes a security hole.
Fixed two security holes (missing bounds checks) in the DCT decoder.
Do the correct zooming for "Fit" and "FitR" destinations.
When PSOutputDev rasterizes a page (because it contains transparency),
  the image is broken into stripes if it is above a size threshold.
Split several special cases off from Splash::pipeRun, for performance.
Add a sanity check for excessively large font sizes (which caused
  problems because Xpdf tried to allocate memory for a font cache).
Fixed a bug in the GfxCIDFont constructor involving reading the
  vertical metrics.
Tweak the Type 3 bbox code to allow some slack on the left/bottom
  edges, as well as the top/right edges.
Fixed a bug that was causing problems rendering Type 3 fonts to 1-bit
  monochrome output.
Handle the case where AES padding is invalid.
Changed XRef::getNumObjects to return the number of used entries,
  instead of the same value as returned by XRef::getSize().
Ignore bogus entries in the TrueType table directory instead of
  immediately giving up on the font.
Fixed a bug in the radial shading code that could cause divide-by-zero
  errors.
Tweaked the TrueType font fixup code to deal with an extra zero entry
  at the end of the loca table.
Increased font cache sizes to improve performance.
Tweaked the TrueType notdef kludge to skip the notdef glyph only if it
  was caused by a character for which a Unicode/MacRoman mapping could
  not be found.
Added another font size sanity check, this time for Type 3 glyphs.
Added initial support for optional content (layers) - no GUI yet.
For CID fonts that specify the 'Adobe-Identity' or 'Adobe-UCS'
  collection, use an identity mapping for char code-to-Unicode
  conversion.
The PDF spec claims that names are limited to 127 chars, but Distiller
  8 will produce longer names, and Acrobat 8 will accept longer names
  -- Xpdf will now handle them, too.
Change the Catalog code so it doesn't load the entire page tree at
  startup (this only helps the command line tools - the viewer scans
  all of the pages at startup).
Clip opacity values to the range [0,1].
Handle glyph names of the form 'unixxxx' (similar to Ann, Axx, etc.).
Resolution of rasterized pages in PostScript output was not being
  computed correctly (resulting in overly large images).
Extend the mapUnknownCharNames config command to cover CID fonts.
Zero-length segments in the middle of stroked paths were not being
  handled correctly -- they should be completely ignored, except for
  the special case of a zero-length path with round line caps.
Various optimizations to the Splash rasterizer.
Allow "Identity" and "Default" as the transfer function in soft masks.
Tweaked the ToUnicode CMap parser to allow <00xx> char codes for 8-bit
  fonts.
TextPage::clear() was not clearing the lists of underlines and links.
Changed the CCITTFax decoder to correctly handle the interaction
  between the EndOfLine and EncodedByteAlign parameters.
Fixed a bug where xpdf wouldn't go to a destination specified on the
  command line, if continuous mode was enabled
  (xpdf -cont file.pdf +foo).
Fixed a bug in the FreeType interface code which was causing incorrect
  positioning/sizing of characters.
Tweaked the FreeType interface code - use 'light' hinting with Type 1
  fonts (because it generally looks better).
Tweak the Windows font searching code to handle "Black" fonts.
Changed the way filled-and-stroked text is handled -- use Splash to do
  both the fill and the stroke (rather than using the font ending to
  do the fill and Splash to do the stroke); also turn off stroke
  adjustment when drawing stroked text.
Ignore generation numbers on compressed objects (to match Adobe's
  behavior).
Changed the PostScript PageSize policy from 3 to 6 (choose next
  largest paper size, don't rescale).
Check that the mask values for color key masked images are in range --
  both Ghostscript and Distiller choke on the PostScript if invalid
  mask colors are specified.
Fixed a bug in generic region decoding in the JBIG2 decoder.
Fixed the lexer to handle large real numbers correctly.
Pdftops wasn't correctly handling tiling patterns that use both fill
  and stroke operators.
Report an error if the Size array in a sampled function includes any
  zeros.
Invalid object streams were not being handled correctly.
Check for loops in xref tables.
Handle the case where a content stream ends after the 'ID' operator
  which starts inline image data.
Check for invalid object streams (i.e., an object stream can't be
  inside another object stream.
Add a recursion limit to the object parser - this avoids stack
  overflows with various sorts of damaged PDF files.
Handle various parameter settings in the extended graphics state
  dictionary.
Added an overprint preview mode (for CMYK output only).
Correctly handle FitH/BH/V/BV link destinations that contain null
  values for positioning parameters.
If the PDF file doesn't define a BaseURI, set one based on the
  location of the PDF file -- this allows relative links to be handled
  correctly.
Use ResusableStreamDecode when generating Level 3 PostScript for an
  explicitly masked image.
Tweak the Type 1 font parser to handle encodings with multiple
  characters on one line.
Invert subtractive color components before passing them to the
  blending function.
Fix an invalid array access in SplashOutputDev::setSoftMask() in CMYK
  mode.
A PS interpreter may attempt to read past the end of a preloaded
  image, so we need to check for that.
Fixed several overflow/uninit bugs in JBIG2Stream.
Fix the CCITTFax decoder to correctly find end-of-file (RTC/EOFB)
  markers when the EndOfLine parameter is false.
Don't limit the startxref offset to 10 digits - some PDF generators
  use extra leading zeros.
Increase the number of digits printed for floating point numbers in
  PostScript output -- it was running into numerical accuracy problems
  on large pages.
Fixed integer overflow bugs in Catalog.cc and GfxFont.cc.
Zero-length tables in TrueType fonts should be treated as missing.
ToUnicode CMaps map char codes to Unicode; .cidToUnicode files map
  CIDs to Unicode -- ToUnicodeCMaps were being handled incorrectly.
Added the "psRasterResolution" and "psRasterMono" xpdfrc commands.
Added code to FoFiTrueType to check for entries in the table directory
  with bogus tags -- this handles the case where the number of tables
  given in the header is too high.
Negative shift values in the PostScript bitshift operator were being
  handled incorrectly.
GfxICCBasedColorSpace was not correctly bounds-checking the number of
  components.
Check SampledFunction input values for NaNs.
Fix a divide-by-zero when the page width or height is zero.
Fix a bug positioning text in PostScript output - if the last char in
  a string has an incorrect width in the PDF font object, that messes
  up the total string width, so we have to position individual chars.
In PostScript output, if CID font substitution fails, drop all text in
  that font.
Handle PDF files that set the stream/string decryption filters to
  Identity (i.e., no encryption).
Avoid passing a zero font size to FreeType.
Tweak raw mode in the text extractor to handle words on the same line
  drawn in the wrong order.
Pdftops was generating a singular transform matrix for annotations
  whose bounding boxes had zero width or height.
Handle embedded OpenType CFF fonts with CIDToGIDMaps.
Remove the old kludge from PSOutputDev that was converting char 32
  from ".notdef" to "space".
Allow CCITTFax images to be more than 32k pixels wide.
Modified the CMap parser to handle usecmap with Identity-H/V.
Added some parameter checking in the JPX decoder.
Added checks for infinite loops in PDF objects - for color spaces,
  functions, optional content, and outline items.  
Add support for mouse button bindings up to button 32 (old limit was
  7).
Fixed a bug in the decryption code for revision 3 with keyLength < 16
  -- the owner password was not being handled correctly.  [Thanks to
  Matthias Franz.]
Tweaked the font naming algorithm in PSOutputDev.
Treat mirrored (as opposed to rotated) text the same as upright text
  in pdftotext.
Fixed buffer overflows in Splash and SplashBitmap.
Check for bogus character codes (e.g., <ffffffff>) in ToUnicode CMaps.
The radial shading code (in both Gfx.cc and PSOutputDev.cc) was not
  computing the s bounds properly.
Drop empty subpaths in clip and fill (but not stroke) operations -
  this can significantly speed up clip performance in the weird case
  where a PDF file does "<x> <y> <w> <h> re <x> <y> m h W n".
Added code to FoFiTrueType to check for an invalid loca format field
  in the head table.
The axial shading code (in Gfx.cc, but not PSOutputDev.cc) was not
  computing the incremental polygon vertices correctly.
Set the character width in TextOutputDev to something sensible for
  vertical fonts.
Added basic support to the text extractor for vertical writing mode.
The non-interactive tools (pdftotext, pdftops) now free Page objects
  after using them, avoiding performance problems with pages that have
  huge resource dictionaries.
Check for line dash arrays like [0], and draw nothing at all (to match
  Acrobat's behavior).
Add a sanity check for the ascent/descent values in FontDescriptors.
Single-point paths with a line dash were causing a crash.
Correctly handle Level 3 PostScript output with masked images inside
  patterns.
Tweaked the xref repair code so that it runs if the catalog is messed
  up (in addition to running if the xref table is damaged).
If Indexed color space tables (streams or strings) are too small,
  reduce the max index instead of throwing away the color space.
Change the CMap parser to allocate memory only when it sees a mapping,
  not when it sees a 'codespacerange' declaration -- this avoids
  allocating huge amounts of memory for CMaps with large, unused
  codespaceranges.
In monochrome mode, treat lines with width <= 1 as hairlines (to match
  Acrobat's behavior).
Added the "-rawdates" option to pdfinfo.
Optimized ImageStream::getLine().
Fixed the Hue, Saturation, Color, and Luminosity blend functions to
  match Adobe's spec.
Fixed the non-isolated group compositing computation.
Skip extraneous unused data at the end of JBIG2 segments.
Change the algorithm that stroke/fill adjustment uses so that the
  edges of adjacent strokes/fills line up.
Do stroke adjustment on end caps when cap style is butt or projecting.
Fixed a security hole: Gfx.parser was not being initialized to NULL.
If an embedded font object is invalid or non-existent, do font
  substitution (same as if there were no embedded font).
TextOutputDev was reusing an old font in the case where the font
  changed but the font size and character positioning stayed the same.
When starting a transparency group, copy the fill/stroke colors from
  the graphics state.
Tweaked the fixed-point code.
When a TrueType font is declared resident (with a psFont command),
  don't munge the encoding.
Look for URIs starting with "www." and treat them as absolute "http:"
  URIs, not as relative URIs (to match Adobe's behavior).
Added code to FoFiTrueType to check for a zero-entry cmap table.
Tweaked the font substitution code to do a better job of scaling the
  substituted font.
Require at least two splits in the axial shading color bisection.
Optimized JBIG2Stream::readGenericBitmap().
JPXStream wasn't correctly handling row padding for images with fewer
  than 8 bits per component.
Optimized the ToUnicode CMap parser.
Added a "whole words only" option to text searches.
Check for valid component parameters in the DCT decoder.
Implement embedding of external 16-bit fonts (without subsetting) in
  PostScript output.
Added the minLineWidth xpdfrc command.
Added warning messages for font substitutions.