changes

读写pdf文件的程序开发库源码

  - use the ToUnicode font dict entry
  - pdfinfo and pdftotext (with '-htmlmeta') convert info strings to
    the selected text encoding
Added key bindings for forward ('v') and backward ('b').
Added the pdffonts program which lists the fonts used in a PDF file.
Fixed several problems in the TrueType font embedding code (for
  PostScript output).
Accept named destination on command line.
Added several new items to pdfinfo: file size, PDF version, tagged
  (yes or no), XML metadata (with the -meta option).
Pdftops didn't get the portrait/landscape setting correct for PDF
  files with rotated pages.
The TrueTypeFontFile class (including the Type 42 converter) now
  understands cmap format 6.
Improved the "about" window -- mention the GPL, add a list of key
  bindings.
Added Zcaron and zcaron characters to WinAnsiEncoding.
The '0' keyboard shortcut didn't update the zoom popup menu.
Handle the complete list of alternate names for the Base14 fonts.
Fixed substitute font scaling in XOutputDev - scale only the width,
  not the height.
Implemented stitching (type 3) functions.
Handle the case of moveto/closepath/clip, which defines an empty
  clipping region.
Move dependences into separate Makefile.dep files; get rid of the
  distdepend target.
Move all of the configure-script-generated -D options out of the
  Makefiles and into a top-level .h file (aconf.h).
Cleaned up the FreeType 1/2 detection code in the configure script.
Pdfinfo prints dates in a more readable format.
Fixed a bug in the Paeth image predictor.
Handle annotations with multiple states.
Another workaround for buggy X servers: clip points that are way out
  of bounds.
Added libpaper support (for Debian).
Generate PostScript DSC resource comments for PS (not just EPS)
  files.
The save and restore (q/Q) operators shouldn't save/restore the path.
Performance optimization: disable pattern drawing in TextOutputDev.

1.00a (2002-feb-25)
-------------------
Added an optimized special case for one-bit images in XOutputDev.
Implemented CID TrueType font embedding; added a psEmbedCIDTrueType
  option.
The initialZoom X resource was broken.
The reverse MacRoman encoding should return 32 for "space" (not 202,
  which is an alternate encoding).
Tweaks to the FreeType 2 support: only disable hinting if the bytecode
  interpreter is disabled (i.e., disable autohinting but not bytecode
  hinting); add some padding to the glyph cache for CJK fonts.
Added level3 and level3Sep options for the psLevel setting and
  corresponding -level3 and -level3Sep options to pdftops.
Added a -level2 option to pdftops for consistency.
Avoid a divide by zero in pdftotext.  [Thanks to William Bader.]
Added a Greek language support package.  [Thanks to Alexandros
  Diamantidis and Maria Adaloglou.]
Don't bother trying to extract a "builtin" encoding from a TrueType
  font.
Accept either a page number or a page reference in a link
  destination.
Update the fontFixedWidth flag in GfxFont after reading the char
  widths (used by the Acorn RiscOS port).
Removed yet another (illegal but not caught by gcc) class specified
  from a .h file.
Avoid using snprintf - it's not available everywhere.
Improved the CMYK->RGB transform.
Use mkstemps where available.

1.01 (2002-may-20)
------------------
Implemented Type 3 fonts.
Implemented PostScript CID font embedding; added a
  psEmbedCIDPostScriptFonts option.
Implemented PostScript 16-bit font substitution; added psNamedFont16
  and psFont16 options.
Moved the initialZoom setting from X resources to the xpdfrc file.
Implemented the radial shading type in the sh (shaded fill) operator.
  [Thanks to Mike Sweet.]
Added an 'include' command to the xpdfrc format.
Added the displayNamedCIDFontX option so different fonts can be used
  within one character collection.
Added a simple reverse video mode (-rv switch, xpdf.reverseVideo
  resource).
Implemented stroked text in XOutputDev (with t1lib and FreeType2).
  [Thanks to Leonard Rosenthol.]
Implemented stroked text in PSOutputDev.
Added a built-in Unicode map for UCS-2.
New key binding in xpdf: 'g' activates the page number text field.
PSOutputDev will now embed external TrueType fonts in addition to
  external Type 1 fonts.
The psEmbedType1Fonts and psEmbedTrueTypeFonts options were missing
  the "Fonts" suffix.
Documentation in xpdf.1 for -freetype option was wrong.
Added the Big5ascii Unicode map to the Chinese-traditional support
  package (maps 7-bit ASCII straight through).  [Thanks to Lawrence
  Lai.]
Modified the EUC-CN and EUC-JP encodings to pass 7-bit ASCII straight
  through.  [Thanks to Lawrence Lai.]
Avoid a divide by zero in XOutputDev.  [Thanks to Simon Burge.]
Remove old code in openTempFile that removed an extension from the
  name returned by tmpnam.
Tweak the scrolling behavior when switching pages.  [Thanks to Case
  Jones.]
In the code that guesses character names (for font subsets), also
  handle names of the form 'ABnnn'.  [Thanks to Colin Granville.]
Fix the transform code for annotations.
Improved the CMap file parser to handle more general PostScript
  lexical conventions.
Added '-enc' option to pdfinfo.
Added the small caps and oldstyle numbers from Adobe's Unicode
  corporate use area to the Latin1 and ASCII7 Unicode maps.
The code in TextOutputDev that guesses Type 3 font size could generate
  a zero size, which resulted in div-by-zero errors.
Various tools (including Adobe's) occasionally embed Type 1 fonts but
  label them Type 1C - so check for a '%!' at the start.
Some tools embed Type 1C fonts with an extra whitespace char at the
  beginning - just skip over it.
Fixed a typo in the Simplified Chinese add-to-xpdfrc file.
Updates to dj_make.bat and the djgpp build instructions.
Added a Turkish language support package.
Updated VMS build scripts.  [Thanks to Martin Zinser.]
Modify the incremental display update code to redraw less often if
  most of the commands are vector graphics, as opposed to text and
  images.
Tweak the Type 1 font bbox code to look at the bboxes in both the PDF
  font object and the embedded font file.
Fixed the ETenms-B5-H CMap file (for traditional Chinese) to map the
  Latin characters to their proportional versions.
Added an optional displayCIDFontX entry for one of the Arphic TrueType
  fonts in the traditional Chinese 'add-to-xpdfrc' file.
Remove leading '-' on include statements in Makefiles.
Added psASCIIHex parameter.
Added the GBK Unicode map to the simplified Chinese language pack.
Pdftotext now opens the text file in binary mode to avoid Microsoft's
  annoying automatic end-of-line translation stuff.
Added an executeCommand function in goo/gfile.cc.  [Thanks to Mikhail
  Kruk.]
The %ALDImagePosition OPI comment was wrong if the page was scaled to
  a different paper size.
The OPI code was saving the default transform matrix before calling
  setpagedevice, which can change the matrix.
Fixed a crash when an inline image dictionary contains garbage.
Upgraded to autoconf 2.53.
Use unsigned int file offsets, to allow access to PDF files in the 2-4
  GB size range; use fseek64/ftell64 if available.
Fixed two floating point exception cases that came up with broken PDF
  files.
Avoid a crash when printing an error message regarding an unnamed
  font.
Default link border width should be 1.  [Thanks to Michael Pfeiffer.]
Minor tweak to build with FreeType 2.1.0.
Handle "weird" characters in PostScript font names.
PSOutputDev now handles PostScript XObjects.
Added several more page attributes for the pdftex project.
Transferred the copyright to Glyph & Cog, LLC.

2.00 (2002-nov-04)
------------------
Switched to the Motif toolkit.
Support multiple open documents (in separate windows).
Added document outlines to the viewer.
Modified the text extraction (placement) algorithm.
Implemented the JBIG2 decoder.
Added a Latin2 language support package.
Added support for movie annotations.
Switched back to native LZW decompression code.
Text extraction from Type 3 fonts was (partly) broken.
The owner password checking code was missing a step in the case of
  128-bit encryption.
Added the 'printCommands' option to the xpdfrc file.
Added key binding for '?' to bring up the about/help dialog.
In TextOutputDev, ignore any text that's outside the page bounding
  box.
Text extraction throws away "tiny" characters after the first 20000
  per page, to avoid really slow runtimes with PDF files that use
  special fonts to do shading or cross-hatching; added the
  'textKeepTinyChars' option to disable this behavior.
Text extraction discards duplicated text (fake boldface, shadow
  effects).
Added ctrl-F as a key binding for find.
Added a "find next" function, bound to ctrl-G.
Added ctrl-P as a key binding for print.
Modified the DCT decoder to handle progressive and non-interleaved
  JPEG streams.
Added key bindings for ctrl-Home and ctrl-End.
Allow the initialZoom setting to be made in either the xpdfrc file or
  as an X resource.
Added a Hebrew language support package.  [Thanks to Roy Arav.]
The "make distclean" target now creates (empty) Makefile.dep files in
  the three subdirectories.
Initialize XRef::ownerPasswordOk.
Correctly handle stroking of Type 3 fonts in PSOutputDev.
Generate correct PostScript for fonts with "weird" character names
  (e.g., "(").
Generate correct PostScript for images using Indexed color spaces with
  DeviceN base color spaces.
Added lowercase Roman numerals to ISO-2022-CN.unicodeMap (simplified
  Chinese support package).
Tweak the image scaling code to better handle flipped (top-bottom
  and/or left-right) images.
Generate correct PostScript code for inline images and images in Type
  3 fonts which are too large for a single PS string.
Correctly handle indexed color spaces whose base color spaces have
  component ranges other than [0,1].
Optimized the DCT decoder.
Fixed mistakes in the list of key bindings in the about/help dialog.
Optimized the Flate decoder.
Add literal names for punctuation and digits to the Unicode name
  table.
Cygwin's popen wants mode "r", not "rb".
Fixed a bug in the Type 4 function parser (the "if" operator wasn't
  parsed correctly).
Fix a bug in PS output for TrueType fonts with no PDF encoding.
Make the bbox size in FTFont more liberal (to avoid problems with
  fonts that have incorrect bboxes).
Reverse the colors in PBM files generated by pdfimages, so the common
  case (an image mask filled with black) comes out correct.
Add fseeko/ftello support which is basically identical to
  fseek64/ftell64.  [Thanks to Nassib Nassar.]
Modified column assignment in text extractor to account for characters
  that convert to multiple characters in the output encoding.
Fix TrueType fonts which have an incorrect cmap table length.
Work around a pragma bug in the version of gcc that ships with MacOS X
  10.2.  [Thanks to Frank Siegert and Andrew Stone.]
Fix a problem that was causing an infinite loop when a damaged content
  stream contains an 'ID' command inside a dictionary.
Handle the case where systempapername() returns NULL (libpaper
  support).
Handle fonts which are defined directly in the font resource
  dictionary rather than as separate objects.
Track process colors in Level 1 separable PostScript.
Pdfinfo now checks the return value from mktime to avoid seg faults in
  flakey strftime implementations.
If duplex is not enabled in PostScript output, leave the duplex
  setting alone, allowing the spooler to insert its own setting.
Added three missing fclose calls.
Change the default encoding for TrueType fonts (used when the PDF file
  doesn't specify an encoding) from MacRomanEncoding to
  WinAnsiEncoding.
Move X_CFLAGS to the end of the list in CXXFLAGS (in Makefile.in) to
  avoid some of the FreeType2 include path problems.
Fixed an obscure bug in the LZW decoder.  [Thanks to Martin
  Schroeder.]
Fixed a bug in decryption when using the newer (PDF 1.4) algorithm
  with shorter-than-128-bit keys.
Minor optimization for image data streams: the ImageStream class can
  return an entire buffered line.

2.01 (2002-dec-05)
------------------
Redesigned the text extraction process:
  - process the text into "reading order"
  - added a "-layout" flag to pdftotext to switch back to the old
    style, where physical layout is maintained
  - use of the "-raw" flag is no longer recommended
Added the -reload option for xpdf (in remote mode).
Added support for external CID fonts; added the displayCIDFontT1 and
  displayNamedCIDFontT1 commands to the xpdfrc file.
Handle the case of moveto/newpath/clip, which defines an empty
  clipping region (just like moveto/closepath/clip).
Accept XYZ link destinations with missing array elements.
Fix some problems with state save/restore triggered by Type 3 fonts
  that reference other fonts.
Accept bogus font names based on "Symbol": Symbol,{Bold,Italic,
  BoldItalic}.
Fixed color and font resource names in the xpdf man page.
Was using delete instead of gfree in OutlineItem::~OutlineItem.
Set the busy cursor in the find dialog while searching.
Map variants of the copyright, trademark, and registered trademark
  symbols to the proder Unicode codes, not to Adobe's corporate use
  area codes.
Fixed a floating point exception bug in TextOutputDev (check for a
  too-small denominator).
Fixed a typo in TextOutputDev, in the code that generating blank lines
  to add vertical whitespace.
Config files whose last line didn't end with a LF (or CR+LF) weren't
  being handled correctly.
The code that handled CIDToGIDMaps in Type 2 CIDFonts was broken.
Check the per-glyph bounding box in Type 3 fonts, and don't try to
  cache glyphs with bogus bboxes.
Allow ToUnicode CMaps to use fewer than four hex digits in the Unicode
  char indexes.
Added multithreading protection to the GlobalParams class.
Fixed a bug in end-of-stream detection with the TIFF predictor.
Added some characters to MacRomanEncoding to match up with Apple's
  definition.