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2018-01-18Declare variables closer to use in CJBig2_Image::composeTo_opt2().Lei Zhang
Change-Id: Ifabaf71bb45ffa7e9af7da4acb21d8757e9596ce Reviewed-on: https://pdfium-review.googlesource.com/23150 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-18Move format specific elements out of ContinueDecodeRyan Harrison
Refactoring the big image format switch in ContinueDecode to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: Ide4892526ee823023c233f0e43b1c98ac8bd1477 Reviewed-on: https://pdfium-review.googlesource.com/23134 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Move format specific elements out of StartDecodechromium/3324Ryan Harrison
Refactoring the big image format switch in StartDecode to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: I4e609ecaec0c5d0e173957c0795555b37c38f9a2 Reviewed-on: https://pdfium-review.googlesource.com/23131 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Move format specific elements out of DetectImageTypeRyan Harrison
Refactoring the big image format switch in DetectImageType to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: I52cc83879da20b33d471420016f6b1eb53993f0b Reviewed-on: https://pdfium-review.googlesource.com/23130 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Remove param checking from StartScanLineRyan Harrison
By catching this early we are now actually returning the wrong value. The bad value should be passed into the jpeg library code, which will cause a fatal error and jump out to the common error handling code for this method. BUG=pdfium:986 Change-Id: Ib3d32939aa38aece887c014c3a477407ee178193 Reviewed-on: https://pdfium-review.googlesource.com/23119 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Move remaining jpeg error handling up a levelRyan Harrison
This moves the setjmps needed for handling fatal errors in the jpeg library up a level to be in line with how other instances of this are being modified. This additionally reduces the number of times that setjmp needs to be called and documents why it is occurring. This covers the Start and ReadScanLine methods. It also adds in setting the error member, which had been missed in previous CLs. BUG=pdfium:986 Change-Id: I7db87288ffe0ee8b29899d97035c30ad812da76a Reviewed-on: https://pdfium-review.googlesource.com/23117 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Move jpeg header read error handling up a levelRyan Harrison
This move the setjmp needed for handling fatal errors in the jpeg library up a level to be in line with how other instances of this are being modified. This additionally reduces the number of times that setjmp needs to be called and documents why it is occuring. BUG=pdfium:986 Change-Id: Ia57821e1ce65aae811618effb3f2fa6256e1ab8c Reviewed-on: https://pdfium-review.googlesource.com/23115 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Correctly handle errors when starting jpeg codecRyan Harrison
The current implementation treats both returning false and longjmp'ing out of jpeg_start_decompress as indicating that the decompression has paused and needs more data. This is incorrect, in reality only the false return value indicates this. The longjmp path indicates a fatal error in the processing of the jpeg. The default implementation actually calls exit() in this case, and the documentation explicitly calls out that in this case recovery isn't possible and the decode process will have to start from scratch. This resolves a situation where the progressive decoder would get a malformed jpeg and keep on grabbing blocks from it and try to start decoding it. This would eventually fail when it ran out of data to read, but would cause a large memory leak and a crash on the MSAN fuzzers. BUG=pdfium:986,chromium:798665 Change-Id: Ifd2ed7a2dc46fa20bab34e9c461a8d4c4718c4d7 Reviewed-on: https://pdfium-review.googlesource.com/23072 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-15Revert "Check for success of decodes to avoid infinite loops"Nicolás Peña Moreno
This reverts commit dca380ffe0571be4023b11b06b8aecad9934bb06. Reason for revert: Causes missing text in a user's PDF Original change's description: > Check for success of decodes to avoid infinite loops > > Bug: 790693 > Change-Id: I9b1d87e024229d8b01f55ec554e2cc544db6ac06 > Reviewed-on: https://pdfium-review.googlesource.com/20230 > Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> > Commit-Queue: Nicolás Peña Moreno <npm@chromium.org> TBR=npm@chromium.org,hnakashima@chromium.org,rharrison@chromium.org # Not skipping CQ checks because original CL landed > 1 day ago. Bug: 790693 Change-Id: I886b14e120c34da757a96f8a1f9c6a081d8326b6 Reviewed-on: https://pdfium-review.googlesource.com/22950 Reviewed-by: Nicolás Peña Moreno <npm@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-12-19Remove some dead code.Lei Zhang
Change-Id: I8edb14c024860c66b5e6c014136393e71e38387d Reviewed-on: https://pdfium-review.googlesource.com/21570 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2017-12-11Remove default arguments to CPDF_StreamAcc::LoadAllData().Lei Zhang
Add LoadAllDataFiltered() and LoadAllDataRaw() and update callers. Change-Id: I9b80ee34a358db204968acdc8b1adc9db0b6b83f Reviewed-on: https://pdfium-review.googlesource.com/20810 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2017-12-01Get rid of else after break/continue/return.chromium/3284chromium/3283Lei Zhang
Change-Id: I3efc57cd7325d16e3ca8ebdeeaec06012b2c56e3 Reviewed-on: https://pdfium-review.googlesource.com/20110 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2017-12-01Check for success of decodes to avoid infinite loopsNicolas Pena
Bug: 790693 Change-Id: I9b1d87e024229d8b01f55ec554e2cc544db6ac06 Reviewed-on: https://pdfium-review.googlesource.com/20230 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-30Prevent integer overflow in CJBig2_HuffmanTable::ParseFromCodedBufferNicolas Pena
In this CL we prevent integer overflow by checking that the integers are in the appropriate range before casting from unsigned to signed. Bug: 789524 Change-Id: I41572849f18ffb0f0739c80130ee6b5061845d29 Reviewed-on: https://pdfium-review.googlesource.com/20011 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-29Allow building pdfium against the system version of libpng.Andrew Weintraub
Bug: Change-Id: I0c930ca30637f58af3b60ed8f1383bd9234a1723 Reviewed-on: https://pdfium-review.googlesource.com/19850 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2017-11-28Remove CollectionSize from JBig2_ContextDan Sinclair
Bug: pdfium:774 Change-Id: Ie7674ac55dea6284a0d974cef107ef357197a06b Reviewed-on: https://pdfium-review.googlesource.com/19610 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2017-11-27Convert CFX_GifContext::GetFrameNum to size_tDan Sinclair
This CL removes the CollectionSize and updates call locations as needed. Bug: pdfium:774 Change-Id: I813c500b3a17a194407ceb1304252b9b16fe1779 Reviewed-on: https://pdfium-review.googlesource.com/19590 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2017-11-21Avoid passing pointers by reference in core.Lei Zhang
This gets rid of most core/ non-const ref passing, either by passing by pointer-to-pointer instead, or by returning std::pair. Change-Id: Id7bdc355a1a725a05f9fa2f1e982ca8c975beef1 Reviewed-on: https://pdfium-review.googlesource.com/19030 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-11-10Check for decoder completeness in CJBig2_GRRDProcNicolas Pena
This CL adds checks in CJBig2_GRRDProc to verify if the decoder is completed before trying to decode. This is currently done in all decoding calls in CJBig2_GRDProc. Bug: chromium:782826 Change-Id: Ifb4ee4d09e8357e969aefa107b4dafbc2284324b Reviewed-on: https://pdfium-review.googlesource.com/18333 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-09Rename some methods in CJBig2_Contextchromium/3264Nicolas Pena
This CL improves some method names and does other basic cleanup. Change-Id: I32ea88ff29383e9685d4c686625088c96f73f035 Reviewed-on: https://pdfium-review.googlesource.com/18210 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-08Prevent cyclic offset on CJBig2_ContextNicolas Pena
This CL changes the type of |m_dwOffset| to safe unsigned integer to prevent the offset from cycling from MAX_UINT32 back to 0. Bug: chromium:778912 Change-Id: Ib93a8392e52eecf2cc223438ac85e9dc529b0f43 Reviewed-on: https://pdfium-review.googlesource.com/18130 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-07Use MaybeOwned in CJBig2_ImageNicolas Pena
Change-Id: Id53cbb8c95f6eb929f6e4eb57333daa24f1b776f Reviewed-on: https://pdfium-review.googlesource.com/18010 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-11-07More FX_SAFE_INT32 in CJBig2_TRDProcNicolas Pena
Bug: chromium:781780 Change-Id: Ie92d8b570c37e9b3364d1ff4502f444a275ee6c2 Reviewed-on: https://pdfium-review.googlesource.com/17910 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-11-03Remove flags param from FXMEM_DefaultAlloc() and friends.Lei Zhang
Change-Id: I24404be0065156a1cfdec31bafdf72c27fa70142 Reviewed-on: https://pdfium-review.googlesource.com/17792 Reviewed-by: Chris Palmer <palmer@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2017-11-03Check for NULL pointer in _TIFFfree().chromium/3258Lei Zhang
PartitionAlloc does not handle free(NULL), so _TIFFfree() needs to do the check, just like png_free_default() and _cmsFree() for other third party code. BUG=chromium:780709 Change-Id: I4e2ff0ba642c66e4a73e151c9ab42ebb42d34a5b Reviewed-on: https://pdfium-review.googlesource.com/17791 Reviewed-by: Chris Palmer <palmer@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2017-10-30More safe ints in CJBig2_TRDProcNicolas Pena
Bug: chromium:778961 Change-Id: I1d08b3282304931276c24e50392c10b21780dcde Reviewed-on: https://pdfium-review.googlesource.com/16971 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-10-25Enforce end of data in CJBig2_ArithDecoderNicolas Pena
Quoting the JBIG2 spec: "If B is a 0xFF byte, then B1 (the byte pointed to by BP+1) is tested. If B1 exceeds 0x8F, then B1 must be one of the marker codes. The marker code is interpreted as required, and the buffer pointer remains pointed to the 0xFF prefix of the marker code which terminates the arithmetically compressed data. 1-bits are then fed to the decoder until the decoding is complete. This is shown by adding 0xFF00 to the C-register and setting the bit counter CT to 8." Our implementation is the alternative (faster for software according to the spec), where only CT is changed to 8. Reaching this part of the code means we will never read from stream again so we should be wrapping up the decoding. To ensure this, the |m_Complete| attribute is set to true if we reach this code again, which will result in bailing out next time DECODE is called. Bug: 767156 Change-Id: I434d46bc7914713a065f0e4da079bbc9b5dd216c Reviewed-on: https://pdfium-review.googlesource.com/16791 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-10-23Fix some integer overflows in CJBig2_TRDProcNicolas Pena
Bug: 649278 Change-Id: Ib9084f6d9bb7dc7bf3713faa22d3a26822a96681 Reviewed-on: https://pdfium-review.googlesource.com/16550 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2017-10-23Return error when attempting to load frame with 0 heightRyan Harrison
A frame with 0 height will have no data, so there is not point in attempting to load it. Additionally some of the loading code assumes a non-zero height implicitly. BUG=chromium:770470 Change-Id: I38b222b46b43ce5d47924526913285510be40603 Reviewed-on: https://pdfium-review.googlesource.com/16551 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-10-05Make GIF decoder more standards complaintRyan Harrison
Fixed issue with unit tests that was causing raw data to be backwards and reverted related LSB -> MSB change that was introduced due to this. If global palette not set then the background colour index should be 0. Check that background colour index is valid when global palette exists. Check if transparency index is valid for the palette of the frame it is being applied to. BUG=chromium:770337 Change-Id: I5d9b648f45bbb4c93218664a7035e4d01dbeb627 Reviewed-on: https://pdfium-review.googlesource.com/15453 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-10-03Rewrite how GIF headers are readRyan Harrison
Break up reading the signature and local screen descriptors into seperate functions. Fix a bug in how matching in the signature validation works. Move LSD value assignment to after sufficient data has been confirmed. Convert LSB to MSB methods where they were just wrong. Add unit tests for ReadData, SetInputBuffer, ReadSignature, ReadLocalScreenDescriptor, and ReadHeader. BUG=pdfium:913,chromium:770470 Change-Id: I1683b8aefc11300625b9be8087c6988549308a8f Reviewed-on: https://pdfium-review.googlesource.com/15250 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-10-02Replace GetWord_LSBFirst with FXWORD_GET_LSBFIRSTchromium/3231Ryan Harrison
The existing implementation of a LSB first word method was incorrect, in addition it was implemented to the BMP code, but also used in the GIF code. Thus is should be moved to a common location. Also added in an implementation for FXWORD_GET_MSBFIRST, since the GIF code will need this. BUG=pdfium:914 Change-Id: I0e84813356fbd456b293a190da3c2cde01a6580b Reviewed-on: https://pdfium-review.googlesource.com/15210 Reviewed-by: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-10-02More define cleanupDan Sinclair
Remove unused defines; Move to .cpp files where possible; Fixup values. Change-Id: I88cd5deb04b14ab8e9f8097a695c3d0b52d64b4c Reviewed-on: https://pdfium-review.googlesource.com/15130 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2017-10-02Removing unused definesDan Sinclair
Remove unused defines. Change-Id: Ibf10d8470f19cbf4528fe1342398a39ef15c1d12 Reviewed-on: https://pdfium-review.googlesource.com/15110 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2017-09-28Convert LZW decompressor to use vector instead of static arraychromium/3230chromium/3229chromium/3228chromium/3227Ryan Harrison
Speciifically replacing what was called the "stack_", an array, with a vector called "decompressed_". The fact that this data structure wasn't actually a stack caused a lot of grief when refactoring. BUG=pdfium:903 Change-Id: I056f8fc9183bcde67a03dc9de0dae9ddf9fb0f37 Reviewed-on: https://pdfium-review.googlesource.com/15092 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-28Simplify some OS checks to PLATFORM checksDan Sinclair
This CL simplifies the OS == WIN{32|64} checks to be PLATFORM == WINDOWS checks. Change-Id: I1493d316dd457b0228e4ef39db4cf1d2b8abf97d Reviewed-on: https://pdfium-review.googlesource.com/14870 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2017-09-27Remove error strings from BMP decoding pathRyan Harrison
These are error strings are set but never used for anything. BUG=pdfium:907 Change-Id: I08d9547009116f7386d15b4a965b9a99c7bf1997 Reviewed-on: https://pdfium-review.googlesource.com/15010 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Cleaning up naming of GIF files/classes/variablesRyan Harrison
Moved everything from core/fxcodec/lgif to core/fxcodec/gif Converted CGifContext -> CFX_GifContext Removed _ptr suffixes from CXF_GifContext Movef fx_gif.* -> cfx_gif.* Renamed structs in cfx_gif.h Renamed members of CFX_GifImage Renamed members of CFX_GifContext Renamed CFX_LZWDecoder -> CFX_LZWDecompressor BUG=pdfium:903 Change-Id: I537e905e935da26832e6bbdc03e0373ed5500bcb Reviewed-on: https://pdfium-review.googlesource.com/14990 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-09-27Remove error string from CGifContextRyan Harrison
This string is set, but never used. BUG=pdfium:907 Change-Id: I57555d0dd3670b245554ff2d7163d1d04bcdb7e8 Reviewed-on: https://pdfium-review.googlesource.com/14930 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Remove FXSYS_strlen and FXSYS_wcslenchromium/3226Ryan Harrison
With the conversion of internal string sizes to size_t, these wrappers are no longer needed. Replacing them with strlen and wcslen respectively. BUG=pdfium:828 Change-Id: Ia087ca2ddaf688a57ec9bd9ddfb8533cbe41510d Reviewed-on: https://pdfium-review.googlesource.com/14890 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-09-27Remove FX_STRSIZE and replace with size_tRyan Harrison
BUG=pdfium:828 Change-Id: I5c40237433ebabaeabdb43aec9cdf783e41dfe16 Reviewed-on: https://pdfium-review.googlesource.com/13230 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Make names of GIF types less opaqueRyan Harrison
A lot of the structs in the GIF code use acronyms that are non-obvious unless you are familar with the GIF spec, and even then lead to lots of looking back. Making the naming more explicit. Also converted GifImage to be a struct, since it didn't have any methods defined for it. BUG=pdfium:903 Change-Id: I97ca2adfdc4ada8bcaef5f8f317c1dea7365d70d Reviewed-on: https://pdfium-review.googlesource.com/14836 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Add in missing ! to conditionalRyan Harrison
This was causing us to use the local palette values when they didn't exist, instead of the global palette values. BUG=chromium:769292 Change-Id: I02d19cbcf0cf9e362e123fc7648d8f47991b8155 Reviewed-on: https://pdfium-review.googlesource.com/14910 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Remove unreachable code in fx_codec_iccNicolás Peña
This CL removes unreachable code and also removes the flag Icc_Format_DEFAULT which becomes unused. Bug: chromium:346399 Change-Id: I1cdd0f70ffec2abcd20ddf5b181273971b92ecaa Reviewed-on: https://pdfium-review.googlesource.com/14850 Commit-Queue: Nico Weber <thakis@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Reviewed-by: Nico Weber <thakis@chromium.org>
2017-09-27Cleanup FX macrosDan Sinclair
This CL renames the FX_OS defines to have _OS_ in their names and drops the _DESKTOP suffix. The FXM defines have been changed to just FX. Change-Id: Iab172fba541713b5f6d14fb8098baf68e3364c74 Reviewed-on: https://pdfium-review.googlesource.com/14833 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2017-09-26Remove _FX_IOS_chromium/3225Dan Sinclair
The _FX_IOS_ define is never defined, so it isn't useful to check _FX_OS_ against. Remove. Change-Id: I90b50a1a0dc165073ed223cbfe861b9a227818dd Reviewed-on: https://pdfium-review.googlesource.com/14831 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
2017-09-26Confirm that a global palette has data before attempting to use itRyan Harrison
Previous implementation assumed that if the local colour palette was not specified and the global palette had its size specified, then use the global. If the global palette is disable, it will not have data, but it may have a size. Technically the size is giberish in this case, but the value is allowed to be non-zero, so isn't a sufficient check. BUG=chromium:768089 Change-Id: Iaec15fcd65f3983056df7d56d29118a516334cd9 Reviewed-on: https://pdfium-review.googlesource.com/14819 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-26Move LZW decoder out of fx_gifRyan Harrison
CGifLZWDecoder has been moved out into its own file, name changed to CFX_LZWDecoder, member variable names updated, creation pattern changed, and unit tests added. Wrt the creation pattern, there is no longer a constructor and 2 initialization methods that need to be called. Instead all of the initialization is done as part of the constructor. A wrapper has been added for generating a std::unique_ptr<CFX_LZWDecoder>, so that params can be validated. BUG=pdfium:900,pdfium:901,pdfium:903,pdfium:904 Change-Id: Idcbe773f7fb18b08e64d5a89bfd87d4801332c53 Reviewed-on: https://pdfium-review.googlesource.com/14814 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-22Move C-style functions into CGifContextRyan Harrison
There are a number of functions in fx_gix.h/.cpp that take in a pointer to a CGifContext as their first parameter. Moving these to be methods in that class. BUG=pdfium:902 Change-Id: I8c583ab9e42dda4241aa8a6f865408a94fa6d273 Reviewed-on: https://pdfium-review.googlesource.com/14670 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
2017-09-22Fix crash when rendering invalid GIFRyan Harrison
The core fix in this CL is a change to how LWZ decompression works, so that when the min code table size and the color palette size are different, color codes after the end of the defined color palette are considered errors. This CL also introduces a bunch of tweaks to the call return path, since there were multiple locations where the GIF decode failing status was being dropped on the floor, so the end widget would have a bitmap with the default colour in it, instead of nothing. BUG=chromium:616671 Change-Id: Id6f40d552dc24650c91e9903f710ff2fa63bc774 Reviewed-on: https://pdfium-review.googlesource.com/14630 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
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