[Version : 1.6.6] [Date : 2017/05/22] [Author : CV]
. Completely rebuilt the page layout rendering algorithm
. Some character widths were not correctly extracted because of line breaks in the widths list.
. Fixed an issue where a character map was sometimes instantiated with the wrong parameter.
. Correctly handle character widths for characters defined by CharProcs (ie, for which the only
information we have is how to draw the glyph, but no Unicode equivalent) and the corresponding
character names that may have been passed to the AddAdobeExtraMappings() method.
. Properly decode sequences of hex digits when there is no current font applicable.
. Completed the Unicode to Ansi character map
[Version : 1.6.5] [Date : 2017/05/20] [Author : CV]
. Complemented the Unicode to Ansi mapping table.
. Added the AddAdobeExtraMappings() method, to complement the standard Adobe character maps when given
character names refer to a glyph that has no Unicode equivalent.
. Added the MarkTextLike() method to mark certain portions of text based on their font name and size.
. Changed the GetCaptures() method to return by default a collection of stdClass objects instead of
PdfToText objects whose contents takes time to be displayed when using the print_r() function.
The new boolean parameter $full allows to return PdfToText objects instead when set to true.
[Version : 1.6.3] [Date : 2017/05/17] [Author : CV]
. Changed the $CharacterClasses table, which was causing some constructs, such as T*, not to be
recognized as a single instruction.
. Fixed a decoding bug when a series of hex digits enclosed in '<>' also contained spaces and newlines
(which should have been ignored).
. Allow names in the /Differences array to use the '#xy' notation, where 'xy' are hex digits.
. Significantly complemented character maps for the four Adobe predefined character sets.
. Text captures : changed the behavior of the <rectangle> definitions ; now, captured areas are
accessible by their page number, instead of a sequential index starting from zero. A capture is
defined for each page of the document, even if not in the list of applicable pages. Of course, empty
captures will be contained in the list if nothing was captured on the corresponding page.
[Version : 1.6.2] [Date : 2017/05/17] [Author : CV]
. The adobe-charsets.map file was searched in the wrong directory.
[Version : 1.6.1] [Date : 2017/05/12] [Author : CV]
. Text captures :
- Fixed a mistake where columns having empty values were not present in the object returned by the
GetCaptures() method.
. Complemented the table that maps Unicode special characters such as spaces, quotes, hyphens, etc. to
their Ascii counterpart (mainly for quotes)
. Enforced the ability of the class to work in 'degraded mode' whem some external tables are missing.
. Complemented the four Adobe standard character sets with more entity names, such as Polish characters,
Greek characters and special symbols (hundreds of symbols added).
. Moved the adobe-charsets.map file to the new Maps directory
. Created a Maps/unicode-to-ascii.map mapping file.
[Version : 1.6.0] [Date : 2017/05/08] [Author : CV]
. Added the possibility to capture areas of text :
- The SetCaptures() and SetCapturesFromString() methods define the pages and areas of text within the
pages to be captured (see file README.md for more information). It can be used to define rectangle
shapes or line/columns information
- The GetCaptures() method returns an object containing the captured text areas
- Added the PDFOPT_LOOSE_X_CAPTURE and PDFOPT_LOOSE_Y_CAPTURE to include text that might exceed the
captured area, but whose top/left coordinates are included in the captured area.
. Complemented the Adobe 4 standard character set encodings, to include Polish characters.
. Exported the Adobe standard character sets to external file 'adobe-charsets.map'.
[Version : 1.5.8] [Date : 2017/05/01] [Author : CV]
. Added undocumented aliases for stream encoding (for example, /Fl stands for /FlateDecode).
[Version : 1.5.7] [Date : 2017/04/26] [Author : CV]
. Added the possibility to extract form data :
- Added the HasFormData(), GetFormCount() and GetFormData() methods
- Data extraction based on XML form templates, which maps form fields to human-readable ones
- Form data is returned as an object inherited from the PdfToTextFormData class
. Added the PDFOPT_DEBUG_SHOW_COORDINATES option, which shows coordinates of every text block in the
output text. This option has been designed for the future feature to be implemented, that will allow
to capture text areas.
. Added the Subject and Keywords properties regarding author information
. Changed the text/document_strxpos() methods to use the mb_strxpos() functions instead of strxpos().
The supplied searched string must be encoded in UTF-8.
. Added the PdfToTextBase::GetStringParameter() method, which is able to retrieve parameter values such
as :
/FlagName (parameter value)
and :
/FlagName <parameter value as hexdigits>
[Version : 1.5.6] [Date : 2017/04/21] [Author : CV]
. Added font metrics information for the Adobe Standard 14 fonts, which are hardcoded (in new directory
FontMetrics). This includes Times, Helvetica and Courier with their variations (bold, italic, etc.)
along with the Symbol and ZapDingbats fonts. Currently, font information relates to individual
character widths, which are used for page layout rendering.
. Enhanced layout rendering, which was giving strange results due to improper handling of certain
positioning instructions.
. Complemented the $UnicodeToSimpleAscii table to include special hyphens
[Version : 1.5.5] [Date : 2017/04/20] [Author : CV]
. Added the $UnicodeToSimpleAscii table, which maps Unicode characters which can have an ASCII
equivalent. For example, German "fi" with ligature (U+FB01) becomes ASCII string "fi" ; special
spaces (such as unbreakable space) become an ASCII space (0x20), etc.
. Fixed a warning issued when a page entry does not contain a width and a height.
. Suppressed a warning in non-debug mode when an unsupported encryption algorithm has been found
[Version : 1.5.4] [Date : 2017/04/07] [Author : CV]
. Fixed an issue with the /Kids flag, whose parameters are normally the ids of the objects containing
a page's contents. Sometimes, there is an additional indirection level : the parameter of the /Kids
flag is an obect which in turn contains the ids of page contents objects. Not handling this
situation caused some page contents to be missed.
. Some line breaks were not respected
[Version : 1.5.3] [Date : 2017/04/06] [Author : CV]
. Enhanced page layout rendering :
- Better handle text positioning, especially when a line contains super/subscripted text
- Implemented additional text positioning instructions
- First experimental implementation of templates (which are correctly implemented in the non-page
layout version)
- Fixed a regression intoduced in versions 1.5.1 and 1.5.2.
. Completed some missing codes for the WinAnsiEncoding font, which is far bigger than stated in the
PDF specifications.
. Modified the default value of the ExtraTextWidth property to -5%, since most of the widths
computed by the GetStringWidth() method are a little bit too large.
[Version : 1.5.2] [Date : 2017/04/05] [Author : CV]
. Page layout rendering enhancements :
- Interpret more instructions
- Fixed a problem where two lines, the first one having the biggest font, were joined together
. Fixed a bug in the Unescape() method which allowed octal sequences of more than 3 characters to be
interpreted, giving an incorrect character code as output.
. Some drawing objects were not recognized in the input ; this could affect page layout rendering.
. The document_strpos() methods were not returning the correct page number, but a zero-based offset
(the Pages property is indexed by the actual page number)
[Version : 1.5.1] [Date : 2017/03/31] [Author : CV]
. Corrected a bug in the LZW decompression algorithm.
[Version : 1.5.0] [Date : 2017/03/31] [Author : CV]
. Implemented page layout rendering !!!
- Text parts are displayed in the same order as Acrobat Reader displays them
- Spaces are inserted in the same line when necessary (the BlockSeparator property can be used
to separate items that are on the same line, at different -x-coordinates)
- The PDFOPT_RAW_LAYOUT and PDFOPT_BASIC_LAYOUT options have been added. The default is
PDFOPT_RAW_LAYOUT, which behaves as in the previous versions. The PDFOPT_BASIC_LAYOUT will
activate layout rendering.
- The new ExtraTextWidth property allows to adjust the computed text widths to help determine if
two consecutive blocks of text on the same line should be separated by a whitespace or not.
- Hold a separate set of instructions to be removed from PDF stream before interpretation,
depending on whether the page layout option has been activated or not. This is done not to impact
the performance of this class for callers that use it the traditional way.
This new feature allows to process more efficiently PDF files presenting tabular data or form data
(such as tickets reservations for example). Note that the PDFOPT_BASIC_LAYOUT option simply ensures
that items coming from the PDF file are shown in the correct order and not improperly concatenated ;
it does not visually reproduce what you could see with Acrobat Reader.
. Font descriptors were mistakenly interpreted as font entries.
[Version : 1.4.19] [Date : 2017/03/25] [Author : CV]
. Added the PDFOPT_ENHANCED_STATISTICS flag (for debugging/optimization purposes)
. Added more useless instructions to be removed from the PDF input stream before processing
. Fixed a warning issued when processing certain objects not having stream data
. Fixed a warning issued when a character map does not contain a begincodespacerange/endcodespacerange
construct.
. Fixed a warning issued by the MapKids() method when a page catalog refers to a non-existing object.
. Re-established PCRE error handling during PDF file processing, since the pcre.backtrack_limit clearly
imposes a limit on the size of the data that can be captured (it does not only depends on the
complexity of the regular expression). This means that PDF file scanning will be stopping with an
exception if the size of the object to be captured exceeds such a limit.
. Fixed inappropriate warnings about undefined fonts
[Version : 1.4.18] [Date : 2017/03/25] [Author : CV]
. Fixed a warning issued when author information in buggy PDFs referred to non-existing objects.
. The PageSeparator property was not taken into account by the GetPageFromOffset() method.
. Fixed a regression which caused an exception to be thrown if the PDF document did not exactly start
with '%PDF'
. Remove more useless instruction from the input stream before processing it (graphic-related
instructions).
. Trying to process object streams that contain invalid gzip data led to an infinite loop.
. Handle buggy PDF containing object streams which do not start with an even number of integer values
(this should normally be a list of object number/offset pairs)
. The CodePointToUtf8() function was running into an inifinite loop when the high order bit of the
supplied value was set (unsigned right-shift operator does not exist in PHP 5.*).
. Handle another kind of buggy PDF that have a page catalog referring to a non-existing object ; in this
case the behavior is the same as if there is no page catalog at all : everything is grouped onto a
single page.
[Version : 1.4.17] [Date : 2017/03/21] [Author : CV]
. Drawing instructions between BX/EX were unduly removed, causing some text to be missing sometimes in
the output.
. Fixed an inappropriate property setting in class PdfTexterTimeoutException
. Handle the case where /XObjects contents are not inline but specify another object with the inline
contents. This caused some text to be missed in the output.
. When a Unicode font had a secondary character map (representing the /Differences array), the
secondary cmap was not searched if the character to be mapped was not also defined in the primary
cmap. This caused some mappings to be missed.
[Version : 1.4.16] [Date : 2017/03/19] [Author : CV]
. Completely reviewed the way PDF objects are parsed ; the original code sometimes forced the user to
change the pcre.backtrack_limit PHP setting to abnormal values (14 000 000 for parsing the Adobe
PDF Specifications document itself !)
. Implemented the LZW decompression algorithm for text objects.
[Version : 1.4.15] [Date : 2017/03/17] [Author : CV]
. Added the PDFOPT_IGNORE_HEADERS_AND_FOOTERS option. The previous behavior was to ignore them
systematically.
. Changed the PdfTexterFont object to handle basic encodings
. Refactored class for decryption support :
- Moved some functions to the PfTexterObjectBase object
- Created the PdfEncryptionData class to hold encryption data defined in the PDF file, by
transfering all the encryption-related properties from the PdfToText class to PdfEncryptionData
- Added the EncryptionData property, which currently has the "protected" visibility
- Renamed the IsPasswordProtected property to IsEncrypted
Note : processing of encrypted files is not yet functional
[Version : 1.4.14] [Date : 2017/03/14] [Author : CV]
. Fixed a regression in text decoding when compound text contained angle brackets and right square
brackets (originally fixed in 1.4.12, but regressed in 1.4.13).
[Version : 1.4.13] [Date : 2017/03/13] [Author : CV]
. Updated IDENTITY-H CID font mapping to add more characters.
. Handle the case where a character map states that it handles 2-bytes character codes (using the
begincoderange/endcoderange constructs) while the map itself only contains 1-byte character codes...
. Changed character maps that are secondary to a Unicode map to handle only the characters listed in
the /Differences parameter.
. Updated the offical Adobe WinAnsi character map to include UTF8 codes which have no Windows
equivalent (PdfTexterEncodingMap::$Encodings array).
[Version : 1.4.12] [Date : 2017/03/12] [Author : CV]
. Added the LoadFromString() method, which allows to process PDF contents directly from a string.
. Changed the Load() method to be able to handle remote urls.
. Fixed a bug in the __next_token() method which caused contents following a regular square bracket
character to be wrongly interpreted.
. Integrated a modification resolving the interpretation of escaped octal sequences, that was missed
in version 1.4.11.
. Fixed : The new PdfToTextDecodingException class did not report the supplied error message.
[Version : 1.4.11] [Date : 2017/03/11] [Author : CV]
. Corrected decoding of Ascii85 data (the original version from the 'unknown developer' did consider
that the '%' character was the start of a comment, which is not the case in Ascii85 encoded data)
. Handle the case where data using Ascii85 encoding contains in turn gzipped data
. Optimized the __decode_ascii85() method
. Characters using octal escape sequences were not correctly interpreted when followed by digits after
the 3rd one of the escape sequence. This so&metimes caused incorrect character decoding.
. Added timeout handling features ; when the PDFOPT_ENFORCE_EXECUTION_TIME or
PDFOPT_ENFORCE_GLOBAL_EXECUTION_TIME are specified, the $MaxExecutionTime property and
$MaxGlobalExecutionTime static property (respectively) will be used to prevent exceeding the PHP setting
'max_execution_time'. If such a situation happens, a PdfToTextTimeoutException exception will be
thrown.
. Added the $MaxExtractedImages property, to limit the number of extracted images.
[Version : 1.4.10] [Date : 2017/03/09] [Author : CV]
. Fixed an issue when decoding object streams : a lack of whitespace after the list of object number/
offset pairs implied a shift of one character in object data extraction, making most of the objects
contained in the object stream to be missed.
[Version : 1.4.9] [Date : 2017/03/09] [Author : CV]
. Handle the case where character mappings specified through the /Differences keyword can contain
constructs such as '/uniabcd', where 'abcd' is a sequence of hex digits representing a Unicode code
point.
. Found rare cases where a Unicode map mapped character IDs to a value between 0xF000 and 0xF0FF, which
do not correspond to any Unicode codepoint, but rather to an undocumented font. The class
PdfTexterAdobeUndocumentedFont has been designed to handle such mappings.
[Version : 1.4.8] [Date : 2017/03/08] [Author : CV]
. The new PdfTexterAdobeMap classes did not specify the width of character codes, which caused bad
interpretation of characters expressed as octal escaped sequences.
. Fixed a regression, where the numeric value of octal escape sequences was displayed as is
. Fixed a warning issued when an empty date is specified in Author information
. Fixed a warning issued when instantianting objects of class PdfTexterFont with a missing 4th argument.
. Object streams (compound objects) are now discarded from the object list after processing their
embedded objects
. Fixed bad interpretation of font sizes less than 1 with no leading zero (eg, '.93')
. Better process text contents using characters escaped in octal notation
[Version : 1.4.7] [Date : 2017/03/05] [Author : CV]
. First (and partial) implementation of CID fonts for the eastern Europe languages (currently tested on
Polish).
. Fixed a warning about an undefined $map variable in class PdfTexterIdentityHCIDFont.
[Version : 1.4.6] [Date : 2017/03/04] [Author : CV]
. Fixed errors regarding undefined PdfTexterFont::$WinAnsiCharacterMap and $MacRomanCharacter map, which
had been moved to the PdfTexterAdobeWinAnsiMap and PdfTexterAdobeMacRomanMap classes, respectively.
[Version : 1.4.5] [Date : 2017/03/05] [Author : CV]
. Implemented Cyrillic fonts (ISO-8859-5).
. Created the PdfTexterAdobe*Map classes, to implement the WinAnsi and Mac Roman encodings, instead of
implementing them as tables at the PdfTexterFont class level.
[Version : 1.4.4] [Date : 2017/03/04] [Author : CV]
. Fixed several issues that affected text output :
- Completely changed the way "beginbfrange..endbfrange" constructs are handled ; some interpretation
problems occurred when line breaks were present at unexpected places, giving incorrect character
mappings.
- Unified the way escaped characters are handled in a text stream ; sometimes, the escaped character
appeared as is in the output, instead of being mapped.
- Handle more character escapes such as backspace, which has no equivalent in PHP.
. Handle the case where author information contains parentheses, which are also used as delimiters
[Version : 1.4.3] [Date : 2017/03/03] [Author : CV]
. Handle the case where Unicode fonts can also have an associated /Encoding object, specifying a
/Differences flag that maps character ids to other character ids.
. The checkings performed on special /Contents references which reference an object holding the list
of the objects contained in the page was a little bit too relaxed and, in some rare cases, caused
a few text blocks to be missing in the output (this feature was introduced in version 1.4.1).
. Corrected a warning in method GetMappedFonts()
. For better performance, remove all useless instructions at the start and end of each drawing
instruction block.
. Started expanding the PdfTexterEncodingFont::$Encodings table to add character mappings with
character names not described in the PDF specifications.
. Better handle recognition of author information (sometimes, the hex2bin() function issued a warning)
[Version : 1.4.2] [Date : 2017/03/02] [Author : CV]
. Fixed mapping issue when the same character map was referenced by several font definitions (only the
first definition was associated to the character map, which caused incorrect character mappings when
subsequent fonts were used).
. The regular expression catching author information was a little bit too greedy, causing some
misinterpretations and warnings in the output.
[Version : 1.4.1] [Date : 2017/02/27] [Author : CV]
. Enhanced page contents decoding (sometimes, the parameter of the /Contents flags does not reference
objects containing drawing instructions, but objects containing the list of objects which in turn
contain the real drawing instructions). This caused in rare cases some contents to be missed in the
output.
. Changed the way compound objects are handled : instead of decoding them on-the-fly, preprocess them
before any other processing takes place. This ensure that forward references to objects defined later
in the pdf file will be satisfied.
. Ignore embedded images inside drawing instructions blocks ; the presence of gzipped data inside the
embedded image could cause misinterpretation of drawing instructions following it. For the current
version, embedded images will not be integrated into the image-extraction process.
. Fixed issue where the same group of text was extracted several times with some PDF samples.
. Better handle Japanese documents
[Version : 1.4.0] [Date : 26/02/2017] [Author : CV]
. First implementation for handling languages written from right-to-left (RTL).
[Version : 1.3.18] [Date : 25/02/2017] [Author : CV]
. Corrected the PdfTexterUnicodeMap class, which did not correctly decode character maps in files
generated on Apple where line-endings are carriage returns. As a result, output looked like garbage
data.
[Version : 1.3.17] [Date : 25/02/2017] [Author : CV]
. Completely rewrote the way text specified between parentheses, either as plain text or 2-bytes
character codes, is processed. Some character values preceded with a backslash are escape sequences,
which were not recognized in all cases, thus causing a shift when interpreting 2-bytes values and a
bad mapping for the 2-bytes sequences that followed.
[Version : 1.3.16] [Date : 2017/02/23] [Author : CV]
. Changed the GetFontByMapId() method which was incorrectly searching a global font instead of searching
first for a page-specific font.
. Compound objects were not correctly handled when object number/offset pairs were separated by a newline
(str_replace() was called instead of preg_replace). This caused some objects to be missed.
. Performed some optimizations which allow for a performance gain of 5 to 10 percent in certain cases.
. Removed the suppression of carriage returns, as this is the only line separator used by Adobe software
on Apple.
[Version : 1.3.15] [Date : 2017/02/12] [Author : CV]
. Handles author information whose keyword values refer to existing object contents instead of
referring to a direct value
. Handles new constructions for beginbfchar/endbfchar constructs, which can act as beginbfrange ;
Example :
<21> <0009 0020 000d>
means :
. Map character #21 to #0009
. Map character #22 to #0020
. Map character #23 to #000D
There is no clue in the Adobe PDF specification that a single character could be mapped to a range.
The normal constructs would be :
<21> <0009>
<22> <0020>
<23> <0000D>
. Regular expressions matching Postscript instructions to be removed before interpreting the remaining
contents were sometimes catenating one instruction with the first parameter of the following one,
which caused bad interpretation, some warnings and bad handling of the layout (some lines could be
catenated together).
. Changed the MinSpaceWidth value from 250 to 200 (certain files separate words with lower spacing
values)
[Version : 1.3.14] [Date : 2017/02/07] [Author : CV]
. Fixed the *_strpos methods which did not return correct page information any more
. Added new font aliases possibilities (/0 through /9 and /a through /z)
[Version : 1.3.13] [Date : 2017/02/05] [Author : CV]
. Added the MaxSelectedPages property to extract only the first or last x pages of the document.
. Pure JPEG images are no more loaded into memory (using the gd library) when the
PDFOPT_AUTOSAVE_IMAGES flag is specified.
[Version : 1.3.12] [Date : 2017/02/01] [Author : CV]
. Enhanced image extraction by adding support for more image formats, notably those having the
/FlateDecode flag. The new supported image formats are :
- Standard JPEG data, not initially specified as a real image
- Image data encoded as :
. RGB color values
. CMYK color values
. Gray scale color values
Currently, only 8-bits color components are supported.
. Added the PdfInlinedImage class, and changed the AddImage() and DecodeImage() methods to handle
these new image processing enhancements.
. Corrected incorrect character mappings : the regex that matches beginbfrange such as :
<32> <33> <100>
also matched :
<32> <33> [<57> <59]
(!) as if it was specified as :
<32> <33> <59>
This caused incorrect translation of characters sometimes. This seems to be a bug of the PCRE package ;
as a workaround, the regex matching the second form is tried first.
[Version : 1.3.11] [Date : 2017/01/28] [Author : CV]
. Added the possibility to handle images encoded with the /FlateDecode/DCTDecode flags, which contain
gzipped JPEG data. Other types of images can also be encoded this way but in different formats, and
will be processed later.
. Added the PFOPT_AUTOSAVE_IMAGES flag to autosave images to external files without keeping them
into memory.
. The new property ImageAutoSaveFileTemplate give the template for the external file name when autosave
mode is enabled.
. The new property ImageAutoSaveFormat can be set to one of the IMG_* constants defined in the gd lib.
. Added the ImageCount property, which counts the number of images found in the document even if they
are not processed.
. Added the Output() method to the PdfImage class to display image contents on standard output
. Changed the PeekAuthorInformation() method to remove extraneous newlines when dealing with hex-encoded
data.
. Corrected the ExtractText() method which could generate divisions by zero in some cases.
. Added the PdfImage::DestroyImageResource() method, to free libgd memory.
[Version : 1.3.10] [Date : 2017/01/11] [Author : CV]
. Prevented a warning in GetFontAttributes() when no font resource is defined (this typically happens
for pdf files where the text is graphically drawn and does not use font tables).
. Added a custom hex2bin() function for PHP versions < 5.4.0
[Version : 1.3.9] [Date : 2016/01/01] [Author : CV]
. Fixed warning messages produced when encountering font/map associations in objects with no stream
defined.
[Version : 1.3.8] [Date : 2016/12/24] [Author : CV]
. Added one more place in the Load() method where to recognize associations between font aliases and
the object containing their definitions (some associations were "missed" in certain documents)
. Font specifiers containing a dot were not recognized (eg : /F1.0).
. Corrected a few warnings issued for certain files containing CID fonts
[Version : 1.3.7] [Date : 2016/12/07] [Author : CV]
. The PdfTexterFontTable::MapCharacter() method was generating notices for fonts without character maps.
. The regular expression in the PdfToText::Load() method was sometimes confusing PCRE when trying to
match stream/endstream constructs because it contained [backslash]r and [backslash]n. This caused
some objects to be missed from the input PDF file. They have been replaced with [backslash]s, and
carriage returns/line feeds are removed later from the beginning of the stream data.
[Version : 1.3.6] [Date : 2016/12/02] [Author : CV]
. Started implementation of CID fonts (EXPERIMENTAL) :
- Added the PdfTexterCIDMap abstract class.
- Added the PdfTexterIdentityHMap class, to implement the IDENTITY-H CID font.
. CID tables are externalized and located into the directory pointed to by the PdfToText::CIDTablesDirectory
public static property. Currently, only the IDENTITY-H CID font is (partially) implemented.
. Usual behavior remains for inexisting CID substitution tables : garbage will be produced.
[Version : 1.3.5] [Date : 2016/12/02] [Author : CV]
. Now handles references to font aliases that are local to a page. Previously, font aliases were
considered as global to the document, which caused some incorrect character substitutions.
. Throw an exception if the mbstring extension is not loaded.
. Compatibility with PHP versions prior to 5.6 :
- The memory_get_usage() and memory_get_peak_usage() functions are used only if implemented (they were
implemented far later on Windows than on Unix). If not available, the MemoryUsage and MemoryPeakUsage
properties will be set to zero.
. Fixed : Offsets specified between character strings were incorrectly interpreted, which sometimes
caused groups of characters to be catenated together.
[Version : 1.3.4] [Date : 2016/11/11] [Author : CV]
. The PdfToText class is now compatible with PHP versions < 5.6
. Changed errors to warnings about unimplemented features.
. Corrected a warning issued by the Load() function when looping through page contents : some of them
were NULL, instead of being an array, because of the modifications included in template processing
in version 1.3.2 (related function : PdfTexterPageMap::MapKids).
[Version : 1.3.3] [Date : 2016/11/05] [Author : CV]
. Allow the %PDF tag that signals the start of the PDF document to be located anywhere in the file,
even if preceded with garbage (Acrobat Reader is able to open such files)
. Added the $DocumentStartOffset property to indicate the real start of the document
. Add the $Statistics property with the following entries :
- 'TextSize' : total size of drawing instructions (text objects)
- 'OptimizedTextSize' : total size of drawing instructions, after removing the ones that are
useless for text extraction
. Added new regular expressions to remove useless drawing instructions
. __strip_useless_instructions() method : removed carriage returns to simplify regular expressions and
added a second preg_match() to remove single-line instructions not processed by the first one
. Handle the case where author information is expressed in UTF-16 with a BOM.
. Handle the case where author information is expressed as a series of hex digits.
[Version : 1.3.2] [Date : 2016/11/02] [Author : CV]
. Template references can reference an object, which in turn has its own template references.
Changed the ProcessTemplateReferences() method to recursively handle such a situation.
. Reset internal structures at the end of the Load() method to save memory usage
. For backward compatibility with PHP versions < 5.2.11 where the mb_convert_encoding() function did not
recognize hexadecimal HTML entities, changed the CodePointToUtf8() method to use only HTML entities
expressed as decimal values.
[Version : 1.3.1] [Date : 2016/10/30] [Author : CV]
. Author data was not correctly extracted in some cases.
. The ProcessTemplateReferences() issued some warnings in some cases, when no page structure is defined
by the document
[Version : 1.3.0] [2016/10/27] [Author : CV]
. Added support for indirect object references in text drawing instructions. Such references may be of
the form /Tplx, and are further described as /XObjects within the PDF file. Without this, some parts
of the text contained in the PDF file will be completely missed.
. Added the MemoryUsage and MemoryPeakUsage properties, that give the difference between the memory
occupied at the start and at the end of the Load() method. Note that this will not give the maximum
amount of memory that has been occupied at a given time.
[Version : 1.2.52] [Date : 2016/10/23] [Author : CV]
. Although page header and footer contents are not yet publicly available, they are internally extracted
and removed from page contents. The regular expression that captured such data was too greedy, and
caused regular page contents to be mistakenly interpreted as header or footer contents.
[Version : 1.2.51] [Date : 2016/10/22] [Author : CV]
. Load() method : Added a comprehensive coverage of errors that may be returned by preg_match_all()
when called for extracting obj/endobj constructs (some PDF files may lead pcre functions to reach the
pcre.recursion_limit or pcre_backtrack_limit settings of php.ini).
[Version : 1.2.50] [Date : 2016/10/19] [Author : CV]
. In the Adobe Postscript language, displaying text such as "(my car)" requires the left and right
parentheses to be escaped escaped with a backslash. The class did not handle the case where the
current font uses two-bytes characters, including the backslash itself : in such cases, the backslash
was recognized as a normal character and, since escaped characters are always represented with one byte,
the remaining input was shifted by one byte, giving most frequently far-east Unicode characters,
such as Chinese. Thus, "(my car)" produced the string "\" followed by Unicode garbage.
[Version : 1.2.49] [Date : 2016/10/15] [Author : CV]
. Font name specifiers (/Fx, /TTy, /Rz etc.) were processed differently by the IsFontMap() method (used
to recognize an object that has font specifier/pdf object associations), the AddFontMap() method
(which adds a font map to the internal font table) and the __next_instruction() method (which tries
to recognize font specifiers within Postscript instructions). Such differences in the way of handling
font specifiers led to discrepancies in the output text, with regards to the original text.
. Added the PdfToTextBase::$FontSpecifiers, which is now the regular expression used throughout this
class to recognize a font specifier.
. Added the /OPBaseFont and /OPSUFont font specifiers (used by Ranx Xerox scanners).
. Added the PdfTexterPageMap::GetResourceMappings() method.
[Version : 1.2.48] [Date : 2016/10/14] [Author : CV]
. Some pages could not be extracted correctly from PDF documents including nested page content
descriptions (ie, pages leading to another object listing in turn the objects that describe the page,
instead of directly leading to the object that describe the page).
[Version : 1.2.47] [Date : 2016/09/13] [Author : CV]
. Changed the licensing model from GPL TO LGPL.
. Specialized the PdfImage class into subclasses. The only available subclass for now is PdfJpegImage.
. Added the $EncryptMetadata property, coming from encyption information present in the PDF file.
[Version : 1.2.46] [Date : 2016/08/24] [Author : CV]
. A number of inconsistencies was found in the chain of MapCharacter() methods up to array access
on a PdfTexterCharacterMap object. Sometimes, a UTF8 string was returned, and sometimes it was a
Unicode code point. This conducted to bad character mappings, especially on files generated with
PrimoPdf.
. Added the Title property, coming from author information
. Added a few regular expressions to remove unprocessed drawing instructions in the
$IgnoredInstructionsTemplates array, to reduce the number of instructions processed.
. Fixed a few caching issues about character maps
[Version : 1.2.45] [Date : 2016/08/22] [Author : CV]
. Text objects containing page header/footer drawing instructions were unduly discarded, even if they
contained normal text. Added the ExtractTextData() method to handle such cases.
[Version : 1.2.44] [Date : 2016/08/21] [Author : CV]
. Temporarily disabled processing of far-east characters specified as plain text ( "(xy)" ) instead of
hex string ( "<abcd>" ). This was causing problems with PDF files that really use plain-text (mostly
causing Chinese characters to be displayed instead of strings using the European alphabet).
[Version : 1.2.43] [Date : 2016/08/21] [Author : CV]
. Enhanced handling of fonts not using Unicode character maps :
- Added support for the "/gxx" notation for the /Differences tag, where "xx" is a character number.
- Characters not listed in the /Differences tag were not using the standard Adobe encoding maps
. Added support for password-protected files (note that the current version is not able to decrypt
files yet) :
- Added the $user_password and $owner_password parameters to the class constructor and the Load()
method.
- Added the ID/ID2 readonly property, which comes from the unique file identifier extracted
from the file contents.
- Added the UserPassword, OwnerPassword and IsPasswordProtected properties.
- Added the GetTrailerInformation() and Decrypt() methods
- Added the Encryption* properties
[Version : 1.2.42] [Date : 2016/08/12] [Author : CV]
. The /R font alias was no more recognized, which caused bad character translations.
. Some characters were not properly encoded into UTF8, for blocks of text using the internal Adobe
Windows Ansi and Mac Roman character sets.
. Rearranged some property initialization values that caused syntax errors for PHP versions < 5.6.
. Fixed some y-positioning issues when relative "Td" instructions are used. This prevented line breaks
to be inserted when necessary.
. Temporarily commented out lines of code which were trying to interpret x-position : they were
unnecessarily inserting spaces inside words written in multiple chunks
. Fix : 2-bytes codes can not only specified as hex digits, but also as ascii characters. Eg : "bh"
means : 0x6268.Ths caused for example Chinese characters to be wrongly interpreted on a document
generated from OpenOffice to PrimoPdf.
[Version : 1.2.41] [Date : 2016/08/10] [Author : CV]
. Series of hex digits that represent characters and are related to unmapped fonts using the WinAnsi or
MacRoman encoding scheme where inappropriately split into chunks of 4 digits instead of 2. This
caused in some occasions normal characters to be interpreted as far-east languages, such as Chinese.
[Version : 1.2.40] [Date : 2016/08/09] [Author : CV]
. Changed the way the PdfToText::$CharacterClass array is initialized. It was using constructs such as :
[ 'a' => self::CTYPE_ALNUM | self::CTYPE_XDIGIT, ... ]
which is authorized only for PHP versions >= 5.6.
[Version : 1.2.39] [Date : 2016/08/09] [Author : CV]
. Entirely rewrote the PdfTexterPageMap class, which was incorrectly handling nested page descriptions.
. In the Load() method, changed the way text is extracted from objects : instead of starting from the
list of available text objects and trying to retrieve their page number, the method now loops through
page numbers (defined in the PageMap object property) and use the associated text object ids to
extract their contents.
[Version : 1.2.38] [Date : 2016/08/09] [Author : CV]
. Bug fix : The PdfTexterFont::MapCharacter() method was not modified after the transition to a better
Unicode-to-UTF8 translation ; it was still accepting characters, while it should have been accepting
integer values (character codes).
. Bug fix : unwanted headers and footers were not recognized appropriately in some cases.
[Version : 1.2.37] [Date : 2016/08/08] [Author : CV]
. (optimization) Checking against header or footer data is now made in the ExtractText() method, instead
of __next_instruction(), which caused too many calls to the preg_match() function.
. Added the IsPageHeaderOrFooter() method.
. Bug fix : Positive offsets between two text groups were unduly taken into account for the number of
spaces to be inserted between those groups (negative offsets add spacing, while positive ones are
subtracted from the current x-position).
. Bug fix : Space insertion for relative x-positioning did not take into account the last x position.
[Version : 1.2.36] [Date : 2016/08/07] [Author : CV]
. Added the PDFOPT_NO_HYPHENATED_WORDS option to remove hyphens that break words on two lines.
. (optimization) Introduced a static array giving the character class for some characters
(alpha, digit, etc.)
. Bug fix : characters present in plain text were translated to Ascii NUL
. Bug fix : the __next_token() function was also returning the next character after character codes
specified within angle brackets ("<>"), which caused extra NUL values to be displayed in the output.
[Version : 1.2.35] [Date : 2016/08/06] [Author : CV]
. (optimization) Reduced the number of times author information is scanned in pdf objects.
. (optimization) Removed useless calls to str_pad(), strcasecmp() and substr().
. Optimized the __next_token() method
[Version : 1.2.34] [Date : 2016/08/05] [Author : CV]
. Reduced the number of calls to certain built-in functions (ctype_* functions)
. Font maps were stored using only the number part of their specification (eg, "1_0" for "/C1_0"). This
led to override existing fonts using different notations (ie, "/C1_0" will override an existing font
map that was declared using "/T1_0"). The consequence is that sometimes, the charater map used to
translate text was not the appropriate one, hence some badly displayed characters.
. Fixed an "uninitialized string offset" PHP notice in the __next_token() method.
. Fixed some cases where too many line breaks were inserted between two lines.
[Version : 1.2.33] [Date : 2016/08/05] [Author : CV]
. For optimization reasons, reduced the number of times certain methods were called (GetMapWidth,
PeekAuthorInformation, IsMapped, GetFontByMapId, __get_character_padding, ...)
. Removed a regular expression for reducing drawing contents size which was a little bit too greedy
and caused some characters to be removed from plain text.
[Version : 1.2.32] [Date : 2016/08/05] [Author : CV]
. Optimized regular expressions that remove useless Adobe Postscript instructions and added new ones.
. Rewrote the CodePointToUtf8() method.
. Handled a new way to specify font aliases : /TTx.
[Version : 1.2.31] [Date : 2016/08/04] [Author : CV]
. Removed irrelevant Postscript instructions from text streams (such as graphical drawing instructions),
to reduce the work of the tokenizer (the __next_token() method), which is written in PHP and not as
efficient as a tokenizer written in C.
Removal is done using the preg_replace() function.
. Character translation results are now buffered, to avoid unnecessary calls to the MapCharacter()
method of the PdfTexterFontTable class.
[Version : 1.2.30] [Date : 2016/08/02] [Author : CV]
. Handle object streams, which is a way to group several objects into a single pdf object (in the same
stream). The object flags are : /Type/ObjStm. This explains why certain paragraphs were missing in
certain PDF samples : they were simply "hidden" in object streams.
. The static variable PdfToText::$Utf8PlaceHolder can now include a format to be used for substitutions
of Unicode characters that cannot be translated ; one parameter will be passed to the sprintf()
function before putting it in the output text, the Unicode code point (an integer value).
. The default value for the PdfToText::$Utf8PlaceHolder, when in debug mode, is :
'[unknown character 0x%08X]'
Note that the $DEBUG static variable must be set BEFORE the first instantiation of a PdfToText object.
[Version : 1.2.29] [Date : 2016/08/02] [Author : CV]
. Changed the way the PdfTexterUnicodeCharacterMap class handles character ranges to reduce memory usage
for PDF files defining numerous ranges in character maps. A sample that needed more than 128Mb of
memory now runs correctly with a memory limit of 32Mb.
. Corrected an incorrect reference to self::$DEBUG in PdfObjectBase class.
. Added the IsObjectStream() method.
[Version : 1.2.28] [Date : 2016/08/01] [Author : CV]
. Better handle Unicode translations. Added the CodePointToUtf8() method.
. Added the static PdfToText::$Utf8Placeholder property, which is used when a Unicode character could
not be converted to an UTF8 string.
[Version : 1.2.27] [Date : 2016/08/01] [Author : CV]
. Corrected a bad if() condition in the __next_token() method which caused the message 'Unitialized
string offset xxx' to sometimes occur.
. Added the PDFOPT_IGNORE_TEXT_LEADING option. This option must be used when you notice that an
unnecessary amount of empty lines are inserted between two text elements. This is the symptom that
the pdf file contains only relative positioning instructions combined with big values of text leading
instructions.
. For text fonts not having character maps, take into account the encoding specified in the font
attributes, such as WinAnsi or MacOsRoman, where some characters codes cannot be directly mapped to
Unicode characters (this was causing characters such as the Euro or (TM) signs to be incorrectly
translated).
[Version : 1.2.26] [Date : 2016/07/30] [Author : CV]
. Throw an exception when an unsupported encoding format or when bad flate decoding data is encountered
only if self::$DEBUG is greater than 1.
. Added the EOL property, which is used for line breaks in the extracted text. Default is PHP_EOL.
. Some text constructs can contain a continuation line, such as :
(this is a sentence \
split over two lines)
Removed the continuation line sequence, which caused unnecessary line break.
[Version : 1.2.25] [Date : 2016/07/28] [Author : CV]
. Handled yet another way to specify a font resource : /C0_0, /C0_1, etc. It behaves like the /Fx and
/fx-y notations, in the sense they are a way to associate a font resource object with some kind of
alias (although the pdf specification only talks about /Fx).
[Version : 1.2.24] [Date : 2016/07/28] [Author : CV]
. Decimal numbers not having a leading zero were not recognized as decimal numbers in text coordinates.
. Page maps using the /Kids and /Count flags can be nested ; the top-level /Kids page map contains the
sum of all the pages in its /Kids descendents for its /Count parameter. The warning signalling this
discrepancy has been disabled when not in debug mode, but the PdfTexterPageMap class will need to be
reviewed to handle this new situation.
[Version : 1.2.23] [Date : 2016/07/27] [Author : CV]
. Added the following properties : Author, CreatorApplication, ProducerApplication, CreationDate and
ModificationDate
. Added the PeekAuthorInformation() internal method to retrieve the values of the above properties, if
present.
. Added the GetUTCDate() method to the PdfObjectBase class to reformat dates from Adobe UTC format to
an UTC format that can be understood by the strtotime() function (some dates may for example be
specified in the following format : 20160707182114+02'00', where the '00' string is not recognized)
[Version : 1.2.22] [Date : 2016/07/26] [Author : CV]
. The BlockSeparator property was not used is some cases, which caused certain data presented in a
certain format by certain Pdf generators to appear catenated.
[Version : 1.2.21] [Date : 2016/07/26] [Author : CV]
. Changed the Unescape() method which did not handle at all character specifications using the octal
notation.
[Version : 1.2.20] [Date : 2016/07/24] [Author : CV]
. When encountering an unrecognized FlateDecode stream, throws an exception only if the $DEBUG global
variable is non-false, otherwise ignores the stream data.
This is a temporary measure until I find out how to properly decode such encoded streams correctly.
[Version : 1.2.19] [Date : 2016/07/19] [Author : CV]
. The class do not process any more image contents by default. The following flags can now be specified
to the constructor if image data is to be retrieved :
. PDFOPT_GET_IMAGE_DATA :
Will put raw (undecoded) image data in the new $ImageData[] array property.
. PDFOPT_DECODE_IMAGE_DATA :
Will use the graphics glib library to create a jpeg resource from the raw data
encountered in the PDF stream. Specifying this flag automatically enables the
PDFOPT_GET_IMAGE_DATA flag.
. The new $ImageData property is an array of associative arrays that contains the following entries :
. 'type' -
Image type. Can be one of the following :
. 'jpeg' -
Jpeg image type.
Note that in the current version, only jpeg images are processed, until I find the
method to decode other proprietary Adobe formats.
. 'data' -
Raw image data.
[Version : 1.2.18] [Date : 2016/07/05] [Author : CV]
. For debugging purposes, added the $object_id parameter to the DecodeData() method.
. The DecodeData() method now throws an exception if the stream object does not contain valid gzip data
. Handled the case of empty streams (!), such as :
18 0 obj
<<
/Filter /FlateDecode
/Length 0
>>
stream
endstream
endobj
which was causing warnings from the gzuncompress() function.
[Version : 1.2.17] [Date : 2016/07/02] [Author : CV]
. Avoided processing of empty text blocks, which were causing extraneous line breaks in the output
. For debugging purposes, added a 'token' element in the associative array returned by the
__next_instruction() method.
. Made the difference between absolute positioning instructions ("Tm") and relative ones ("Td" and "TD")
which are often used in tabular data, by introducing the $last_relative_goto_y variable in the
ExtractText() method (individual cell contents were broken into separate lines).
[Version : 1.2.16] [Date : 2016/07/01] [Author : CV]
. No line break was inserted when relative positioning instructions (Td and TD) were encountered. This
caused consecutive lines to be joined together.
[Version : 1.2.15] [Date : 2016/06/30] [Author : CV]
. Corrected the __extract_chars_from_array() methods, which incorrectly handled escaped characters in
text groups and ate up the next character following the escaped one. For example, the following group :
[(3)-3(4)-3(.)11(5)-3(\(f\) a)9(n)4(d)-3( 3)6(4)-3(.6\()6(g)-3(\)\()8(2)4(\), )4(t)-3(h)-3(a)8(t)]
was represented as :
34.5(f)nd 34.6(g)2)that
instead of :
34.5(f) and 34.6(g)(2), that
[Version : 1.2.14] [Date : 2016/06/24] [Author : CV]
. Added the __get_character_padding() method to compute the number of spaces needed between two
chunks of characters, taking into account the MinSpaceWidth property.
[Version : 1.2.13] [Date : 2016/06/23] [Author : CV]
. Took into account the relative x-offset specified with Td/TD instructions
. Added the MinSpaceWidth property, which is to be measured in thousands of text units, to help the
class determine if spaces should be inserted between two character units. The default value is 250.
Although the value can be less than 1000, only a multiple of 1000 units will determine the total
number of spaces to be inserted if the PDF_REPEAT_SEPARATOR flag is set in the Options property.
. Relaxed a little bit the cases where a newline should be inserted
. Don't add the BlockSeparator string if the Separator and BlockSeparator properties are the same, and
the current result ends with the Separator string. When both properties are set to a space, this
avoids inserting double space between column elements.
[Version : 1.2.12] [Date : 2016/06/21] [Author : CV]
. Better handle relative positioning instructions so that text parts supposed to be on the same line
stay on the same line.
. Added the PageSeparator property
[Version : 1.2.11] [Date : 2016/06/19] [Author : CV]
. Renamed the "Separator" property to "BlockSeparator"
. The "Separator" property is now used as a separator for notations such as :
[(1)-1000(2)]
where "-1000" is a value that is subtracted to the current x-position. Some pdf documents presenting
tabular data use this characteristic to separate text in columns. The default value is " " (white
space).
. Added the PDFOPT_* option constants, which can either be specified to the class constructor or changed
by setting the new "Options" property. The only flag available for now is PDFOPT_REPEAT_SEPARATOR, which
has an interest if the offset between two text chunks is less than -2000 ; for example, the following
construct :
[(1)-2000(2)]
will give the string "1 2" if the PDF_REPEAT_SEPARATOR flag is not set, and "1 2" if set (assuming
the Separator property is set to a space).
[Version : 1.2.10] [Date : 2016/06/16] [Author : CV]
. The character after an octal notation was skipped. For example, (\101 X) was rendered as "AX" instead
of "A X".
[Version : 1.2.9] [Date : 2016/06/15] [Author : CV]
. Array of characters which included line breaks were not correctly interpreted
. Added the Separator property, which can be used to separate chunks of text that are recognized to be
on the same line. This is useful for pdf documents that contain mainly tabular data, but it could
break words if it contains textual data.
. Handled a new strange way to specify font numbers (/f-x-y instead of /Fx).
[Version : 1.2.8] [Date : 2016/06/12] [Author : CV]
. Corrected the visibility of the Isxxx() methods, which were public instead of protected.
. Some positioning instructions can be cumulated (a 'Tm' can be followed by a 'Td'). Consider that the
last instruction wins.
[Version : 1.2.7] [Date : 2016/06/11] [Author : CV]
. Added the Images array property, which makes available the images found in the document. The elements
of this array are image data.
. Added a few PDF_*_ENCODING constants which were missing. Not all encoding types have been implemented,
however.
. Added the IsImage() and DecodeImage() methods.
. Added the PdfImage class
. To simplify the management of this source between the Thrak framework and the specific version made
for publishing on phpclasses, added the following :
- error() and warning() functions
- PdfToTextException class
[Version : 1.2.6] [Date : 2016/06/08] [Author : CV]
. Stream/endstream contents can be unencoded and appear in clear text ! Added the PDF_TEXT_ENCODING
constant to handle this case.
. Changed the regular expression in IsFontMap() to allow spaces between "<<" and the first "/F".
. Character maps strike again ! after the issue uncovered in version 1.2.2, where constructs such as :
<012B> <00660067>
means "replace every reference to 0x0012B with unicode characters 0x0066 and 0x0067 (for maps having
a width of 2 bytes), I discovered that some pdf documents having character maps of 1 byte could hold
entries such as :
<03> <0020>
which simply means "replace every reference to 0x03 with character 0x20"... I have not seen any
differentiating factor between the sample I handled in version 1.2.2 and this one. All I can say is
that I put a horrible kludge in PdfTexterUnicodeMap::offsetGet(), to handle a situation were
character widths are one-byte long, and their substitutions can be 2-bytes long, with a leading byte
of zero. S..t.
[Version : 1.2.5] [Date : 2016/06/07] [Author : CV]
. Tried to enhance performance by first looking for objects that contain stream/endstream constructs,
to avoid unnecessary detections of character maps, font definitions, etc.
. Consecutive text shapes introduced by the "Do" instruction were gathered on the same text line. A
line break is now inserted when a "Do" instruction is encountered.
[Version : 1.2.4] [Date : 2016/06/03] [Author : CV]
. Introduced the PdfObjectBase class, from which all the classes defined here inherit. Moved all general
methods at this level.
. Added the PdfPageMap class
[Version : 1.2.3] [Date : 2016/06/01] [Author : CV]
. Found a PDF coming from MAC outer galaxies where some lines were terminated by "\r\n", and some other
by "\r".
. Added more debugging messages when the $DEBUG static class variable is set to an integer value
greater than 1.
. Character references to a CMAP can be specified as \xyz, where "xyz" are octal digits
. The begincmap/endcmap constructs can be omitted, which initially was the criteria to determine if the
current object is a character map. Checked for the presence of beginbfchar/beginbfrange in this case.
[Version : 1.2.2] [Date : 2016/05/31] [Author : CV]
. Modified the PdfTexterUnicodeMap class to handle cases where substitutions in beginbfchar/endbfchar
constructs contains several characters. For example :
<012B> <00660067>
which means that a reference to character #012B must be substituted with #0066 and #0067.
[Version : 1.2.1] [Date : 2016/05/28] [Author : CV]
. Changed the regular expression to match stream/endstream constructs because it captured too much as
in the following example :
<< ... /Type /Stream >>
stream
...
endstream
(the captured data was : " >>\nstream..."). Now a stream construct is detected if not preceded by a
slash.
. Found one case where the beginbfchar/enbfchar and all its contents were put on one line, thus making
the regular expression for capturing characters to fail. Hope this will not happen with beginbfrange...
[Version : 1.1] [Date : 2016/05/21] [Author : CV]
. Added support to retrieve the page number associated to a character offset in the Text contents. New
methods are :
- GetPageFromOffset
- text_strpos/text_stripos
- document_strpos/document_stripos
- text_match/document_match
[Version : 1.0.1] [Date : 2016/05/12] [Author : CV]
. Added code to ignore page headers and footers, which caused unnecessary newlines to be added to the
output (handling page headers and footers would require to break the code).
. The last y-position was not correctly tracked in some cases.
[Version : 1.0] [Date : 2016/04/16] [Author : CV]
Initial version.
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