v1.4.0 (22nd February 2016)
- raise minimum ruby version to 1.9.3
- print warnings to stderr when deprecated methods are used. These methods have been
  deprecated for 4 years, so hopefully few people are depending on them
- Fix exception when a npn-breakng space (character 160) is used with a
  built-in fint (helvetica, etc)
- various bug fixes

v1.3.3 (7th April 2013)
- various bug fixes

v1.3.2 (26th February 2013)
- various bug fixes

v1.3.1 (12th February 2013)
- various bug fixes

v1.3.0 (30th December 2012)
- Numerous performance optimisations (thanks Alex Dowad)
- Improved text extraction (thanks Nathaniel Madura)
- Load less of the hashery gem to reduce core monkey patches
- various bug fixes

v1.2.0 (28th August 2012)
- Feature: correctly extract text using surrogate pairs and ligatures
  (thanks Nathaniel Madura)
- Speed optimisation: cache tokenised Form XObjects to avoid re-parsing them
- Feature: support opening documents with some junk bytes prepended to file
  (thanks Paul Gallagher)
  - Acrobat does this, so it seemed reasonable to add support

v1.1.1 (9th May 2012)
- bugfix release to improve parsing of some PDFs

v1.1.0 (25th March 2012)
- new PageState class for handling common state tracking in page receivers
  - see PageTextReceiver for example usage
- various bugfixes to support reading more PDF dialects

v1.0.0 (16th January 2012)
- support a new encryption variation
- bugfix in PageTextRender (thanks Paul Gallagher)

v1.0.0.rc1 (19th December 2011)
- performance optimisations (all by Bernerd Schaefer)
- some improvements to text extraction from form xobjects
- assume invalid font encodings are StandardEncoding
- use binary mode when opening PDFs to stop ruby being helpful and transcoding
    bytes for us

v1.0.0.beta1 (6th October 2011)
- ensure inline images that contain "EI" are correctly parsed
  (thanks Bernard Schaefer)
- fix parsing of inline image data

v0.12.0.alpha (28th August 2011)
- small breaking changes to the page-based API - it's alpha for a reason
  - resource related methods on Page object return raw PDF objects
  - if the caller wants the resources wrapped in a more convenient
    Ruby object (like PDF::Reader::Font or PDF::Reader::FormXObject) will
    need to do so themselves
- add support for RunLengthDecode filters (thanks Bernerd Schaefer)
- add support for standard PDF encryption (thanks Evan Brunner)
- add support for decoding stream with TIFF prediction
- new PDF::Reader::FormXObject class to simplify working with form XObjects

v0.11.0.alpha (19th July 2011)
- introduce experimental new page-based API
  - old API is deprecated but will continue to work with no warnings
- add transparent caching of common objects to ObjectHash

v0.10.0 (6th July 2011)
- support multiple receivers within a single pass over a source file
  - massive time saving when dealing with multiple receivers

v0.9.3 (2nd July 2011)
- add PDF::Reader::Reference#hash method
  - improves behaviour of Reference objects when tehy're used as Hash keys

v0.9.2 (24th April 2011)
- add basic support for fonts with Identity-V encoding.
- bug: improve robustness of text extraction
  - thanks to Evan Arnold for reporting
- bug: fix loading of nested resources on XObjects
  - thanks to Samuel Williams for reporting
- bug: improve parsing of files with XRef object streams

v0.9.1 (21st December 2010)
- force gem to only install on ruby 1.8.7 or higher
  - maintaining supprot for earlier versions takes more time than I have
    available at the moment
- bug: fix parsing of obscure pdf name format
- bug: fix behaviour when loaded in confunction with htmldoc gem

v0.9.0 (19th November 2010)
- support for pdf 1.5+ files that use object and xref streams
- support streams that use a flate filter with the predictor option
- ensure all content instructions are parsed when split over multiple stream
  - thanks to Jack Rusher for reporting
- Various string parsing bug
  - some character conversions to utf-8 were failing (thanks Andrea Barisani)
  - hashes with nested hex strings were tokenising wronly (thanks Evan Arnold)
  - escaping bug in tokenising of literal strings (thanks David Westerink)
- Fix a bug that prevented PDFs with white space after the EOF marker from loading
  - thanks to Solomon White for reporting the issue
- Add support for de-filtering some LZW compressed streams
  - thanks to Jose Ignacio Rubio Iradi for the patch
- some small speed improvements
- API CHANGE: PDF::Hash renamed to PDF::Reader::ObjectHash
  - having a class named Hash was confusing for users

v0.8.6 (27th August 2010)
- new method: hash#page_references
  - returns references to all page objects, gives rapid access to objects
    for a given page

v0.8.5 (11th April 2010)
- fix a regression introduced in 0.8.4.
  - Parameters passed to resource_font callback were inadvertently changed

v0.8.4 (30th March 2010)
- fix parsing of files that use Form XObjects
  - thanks to Andrea Barisani for reporting the issue
- fix two issues that caused a small number of characters to convert to Unicode
  incorrectly
  - thanks to Andrea Barisani for reporting the issue
- require 'pdf-reader' now works a well as 'pdf/reader'
  - good practice to have the require file match the gem name
  - thanks to Chris O'Meara for highlighting this

v0.8.3 (14th February 2010)
- Fix a bug in tokenising of hex strings inside dictionaries
  - Thanks to Brad Ediger for detecting the issue and proposing a solution

v0.8.2 (1st January 2010)
- Fix parsing of files that use Form XObjects behind an indirect reference
  (thanks Cornelius Illi and Patrick Crosby)
- Rewrote Buffer class to fix various speed issues reported over the years
  - On my sample file extracting full text reduced from 220 seconds to 9 seconds.

v0.8.1 (27th November 2009)
- Added PDF::Hash#version. Provides access to the source file PDF version

v0.8.0 (20th November 2009)
- Added PDF::Hash. It provides direct access to objects from a PDF file
  with an API that emulates the standard Ruby hash

v0.7.7 (11th September 2009)
- Trigger callbacks contained in Form XObjects when we encounter them in a
  content stream
- Fix inheritance of page resources to comply with section 3.6.2

v0.7.6 (28th August 2009)
- Various bug fixes that increase the files we can successfully parse
  - Treat float and integer tokens differently (thanks Neil)
  - Correctly handle PDFs where the Kids element of a Pages dict is an indirect
    reference (thanks Rob Holland)
  - Fix conversion of PDF strings to Ruby strings on 1.8.6 (thanks Andrès Koetsier)
  - Fix decoding with ASCII85 and ASCIIHex filters (thanks Andrès Koetsier)
  - Fix extracting inline images from content streams (thanks Andrès Koetsier)
  - Fix extracting [ ] from content streams (thanks Christian Rishøj)
  - Fix conversion of text to UTF8 when the cmap uses bfrange (thanks Federico Gonzalez Lutteroth)

v0.7.5 (27th August 2008)
- Fix a 1.8.7ism

v0.7.4 (7th August 2008)
- Raise a MalformedPDFError if a content stream contains an unterminated string
- Fix an bug that was causing an endless loop on some OSX systems
  - valid strings were incorrectly thought to be unterminated
  - thanks to Jeff Webb for playing email ping pong with me as I tracked this
    issue down

v0.7.3 (11th June 2008)
- Add a high level way to get direct access to a PDF object, including a new executable: pdf_object
- Fix a hard loop bug caused by a content stream that is missing a final operator
- Significantly simplified the internal code for encoding conversions
  - Fixes YACC parsing bug that occurs on Fedora 8's ruby VM
- New callbacks
  - page_count
  - pdf_version
- Fix a bug that prevented a font's BaseFont from being recorded correctly

v0.7.2 (20th May 2008)
- Throw an UnsupportedFeatureError if we try to open an encrypted/secure PDF
- Correctly handle page content instruction sets with trailing whitespace
- Represent PDF Streams with a new object, PDF::Reader::Stream
  - their really wasn't any point in separating the stream content from it's associated dict. You need both
    parts to correctly interpret the content

v0.7.1 (6th May 2008)
- Non-page strings (ie. metadata, etc) are now converted to UTF-8 more accurately
- Fixed a regression between 0.6.2 and 0.7 that prevented difference tables from being applied
  correctly when translating text into UTF-8

v0.7 (6th May 2008)
- API INCOMPATIBLE CHANGE: any hashes that are passed to callbacks use symbols as keys instead of PDF::Reader::Name instances.
- Improved support for converting text in some PDF files to unicode
- Behave as expected if the Contents key in a Page Dict is a reference
- Include some basic metadata callbacks
- Don't interpret a comment token (%) inside a string as a comment
- Small fixes to improve 1.9 compatibility
- Improved our Zlib deflating to make it slightly more robust - still some more issues to work out though
- Throw an UnsupportedFeatureError if a pdf that uses XRef streams is opened
- Added an option to PDF::Reader#file and PDF::Reader#string to enable parsing of only parts of a PDF file(ie. only metadata, etc)

v0.6.2 (22nd March 2008)
- Catch low level errors when applying filters to a content stream and raise a MalformedPDFError instead.
- Added support for processing inline images
- Support for parsing XRef tables that have multiple subsections
- Added a few callbacks to improve the way we supply information on page resources
- Ignore whitespace in hex strings, as required by the spec (section 3.2.3)
- Use our "unknown character box" when a single character in an Identity-H string fails to decode
- Support ToUnicode CMaps that use the bfrange operator
- Tweaked tokenising code to ensure whitespace doesn't get in the way

v0.6.1 (12th March 2008)
- Tweaked behaviour when we encounter Identity-H encoded text that doesn't have a ToUnicode mapping. We
  just replace each character with a little box.
- Use the same little box when invalid characters are found in other encodings instead of throwing an ugly
  NoMethodError.
- Added a method to RegisterReceiver that returns all occurrences of a callback

v0.6.0 (27th February 2008)
- all text is now transparently converted to UTF-8 before being passed to the callbacks.
  before this version, text was just passed as a byte level copy of what was in the PDF file, which
  was mildly annoying with some encodings, and resulted in garbled text for Unicode encoded text.
- Fonts that use a difference table are now handled correctly
- fixed some 1.9 incompatible syntax
- expanded RegisterReceiver class to record extra info
- expanded rspec coverage
- tweaked a README example

v0.5.1 (1st January 2008)
- Several documentation tweaks
- Improve support for parsing PDFs under windows (thanks to Jari Williamsson)

v0.5 (14th December 2007)
- Initial Release