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2018-04-27Sanitize another image size in CJBig2_Context::parseHalftoneRegion().Lei Zhang
BUG=chromium:836872 Change-Id: I0362fd7708043648bffa26c9248b401ea2793a21 Reviewed-on: https://pdfium-review.googlesource.com/31510 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-27Sanitize the SBNUMINSTANCES value in the JBIG2 decoder.Lei Zhang
BUG=chromium:837192 Change-Id: Ib9c0e7b4aeb6501e81308844d344a784f7c138d8 Reviewed-on: https://pdfium-review.googlesource.com/31490 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-25Replace reinterpret_cast with static_cast where possibleTom Sepez
Change-Id: Ic62f1def8e043494c9fa6c08a937d7d872513567 Reviewed-on: https://pdfium-review.googlesource.com/31314 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-04-25Don't store CE (comment extension) block data when decoding GIFRyan Harrison
GIF extensions are laid out as follows: <size byte> <chunk of data> <size byte> <chunk of data> ... <terminator byte>. The decoder needs to scan along the data, finding the size bytes to determine where the block ends in the stream, even if we don't care about the content. Currently the decoder is storing all of the data chunks, which are never used and take a lot of time to concat together if they are very small. Our implementation of the GIF spec does not handle this extension, so when scanning for the end of the block, just don't bother storing data from it. BUG=chromium:833168 Change-Id: Iadf3ab3afd8145b6c5c7c22c30fe9316efcafc15 Reviewed-on: https://pdfium-review.googlesource.com/31315 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-04-25Use a bool in FindBit() in the fax codec.Lei Zhang
Change-Id: If75c0db94d341715e0bc6406f0fd89812f1ea73c Reviewed-on: https://pdfium-review.googlesource.com/31311 Commit-Queue: Lei Zhang <thestig@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-25Use PredictorType in more places.Lei Zhang
Change-Id: Ifbacab2868232a5597ef782fb24a749ebb4871bf Reviewed-on: https://pdfium-review.googlesource.com/31270 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-25Clean up CCodec_FlateScanlineDecoder.Lei Zhang
- Merge Create() with the ctor. - Initialize all member variables and mark them const when possible. - Add an enum class for the predictor type. - Move it into an anonymous namespace. Change-Id: If7bb62ddf4a4e00ec2d02355e7c178028a7c187c Reviewed-on: https://pdfium-review.googlesource.com/31233 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-25Introduce ScopedFPDF types in public/cpp/fpdf_scopers.hTom Sepez
Applies std::remove_ptr to the public API types so that we can deduce a correct unique ptr type no matter how that API might change away from void* usage. Creates shorter names for std::unique_ptr<std::remove_pointer<>, ...> Change-Id: I04a0ff43cb7d5a4d3867939a53a54c9cef00db86 Reviewed-on: https://pdfium-review.googlesource.com/31292 Reviewed-by: Lei Zhang <thestig@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-04-25Remove unused PNGEncode() code.Lei Zhang
BUG=pdfium:41 Change-Id: I98070a5a6c88a0769f2b571eae4fe62092f7dfcd Reviewed-on: https://pdfium-review.googlesource.com/31232 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-04-23Add more image size checks in CJBig2_Context.Lei Zhang
BUG=chromium:834557 Change-Id: I8fb8d74f87097b39608c3f83f2fa1c4e49e69980 Reviewed-on: https://pdfium-review.googlesource.com/31170 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-16Fix some checks for FX_Realloc() failures.Lei Zhang
FX_Realloc() never fails. So either remove the check or switch to FX_TryRealloc(). Change-Id: I11fd02508add50db900a7502835018c2b61bcd09 Reviewed-on: https://pdfium-review.googlesource.com/30712 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-04-12Fail decode if continuing to get insufficient size errorRyan Harrison
In the case that the low level LZW decoder has indicated insufficient destination size, if another call to decode returns this status after adjusting the destination size, consider it an error. Subsequent iterations will not return a larger destination size, since the expected row size doesn't change, so the code will just loop infinitely, trying to decode a too large row. BUG=pdfium:1059 Change-Id: I14c8cee721fa77d8aab5e99deff9406490f01468 Reviewed-on: https://pdfium-review.googlesource.com/30452 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-04-11Remove CFX_DIBAttribute::m_strAuthorTom Sepez
It is set in a couple of places, but the value is never used for any purpose. Change-Id: I6fc0839bc14b21ee8217fcb3eadf6c252ad67aa7 Reviewed-on: https://pdfium-review.googlesource.com/30330 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-04-03Re-arrange so inline vectors come last in structs.Tom Sepez
This might make the memory tools more effective in finding OOBs. Change-Id: Id093bb0a88c37954c80d612ac00b5a168e75bdbf Reviewed-on: https://pdfium-review.googlesource.com/29550 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-03-21Rename foo_{wid,hei} to foo_{width,height}.Lei Zhang
Change-Id: I94412dd183535c18f4421b465f64870b44ad230d Reviewed-on: https://pdfium-review.googlesource.com/28971 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-03-21Rename "des_foo" to "dest_foo".Lei Zhang
Destination variables usually have "dest" or "dst" as the prefix. Change-Id: If5bb01a5eafe1e4b42d1a6d653abb1b444b1b2fa Reviewed-on: https://pdfium-review.googlesource.com/28970 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-03-21Add helpers to work with FXDIB_Format.Lei Zhang
Helper functions make getting the bpp and component count more readable. Change-Id: Ie0f97d52136d11ef5251f6e22748e87aea289ae1 Reviewed-on: https://pdfium-review.googlesource.com/28572 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-03-06Rename core/fxcrt IFX files to IfaceDan Sinclair
This CL renames the 3 IFX files in core/fxcrt to Iface instead. Change-Id: I7cee6836650b71bc5c5729a8147fda62f0910fe3 Reviewed-on: https://pdfium-review.googlesource.com/27970 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-02-26Shrink some tables and kill dead code in xfa.Tom Sepez
Change-Id: Ic1260417e7d1475dd518655b2ab08f0184955d88 Reviewed-on: https://pdfium-review.googlesource.com/27170 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-02-26Add some more missing consts.chromium/3356Tom Sepez
Get things out of the .data section. Change-Id: I375cf00186a3d5d8d10f5d147bd4b692f5db3683 Reviewed-on: https://pdfium-review.googlesource.com/27130 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-02-16Fix fallthroughs in XFA code.chromium/3350Henrique Nakashima
Change-Id: I1fd4bf85cd709de1c14ed2895d045018f79bc61f Reviewed-on: https://pdfium-review.googlesource.com/26950 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-02-15Correctly seek when header size is larger then expectedchromium/3349Ryan Harrison
BUG=chromium:811733 Change-Id: Idce50b8ea4ca06fc77d5b3931557cd1d6fe48bd5 Reviewed-on: https://pdfium-review.googlesource.com/26710 Reviewed-by: Tom Sepez <tsepez@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-14Check that the request was satisfied in ReadDataRyan Harrison
Currently the BMP decompressor doesn't verify the returned data length was the amount requested. This means we may end up with part of our structure uninitialized if we didn't copy in enough data. This CL verifies the length of data copied is the size we require. BUG=chromium:811853 Change-Id: I20e0e9b3ff1176a620fcb38c3c7e585848b7e428 Reviewed-on: https://pdfium-review.googlesource.com/26850 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-02-13Change return value of GetAvailInputRyan Harrison
This changes the return value from uint32_t to FX_FILESIZE, which is the type the methods is uses return. The existing code does an unguarded static cast, so something like -1 could cause a very large value being returned. This change has a cascading impact up to the top of the progressive codec, which now has to handle negative values gracefully. Change-Id: I813fb71e932dd5da014dbaed0dbf3bb28f8d4e9f Reviewed-on: https://pdfium-review.googlesource.com/26450 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-02-12Fix signedness in CJBig2_HuffmanTable, and add overflow checkNicolas Pena
Bug: 808902 Change-Id: Iad5ab63eeedc3ea85001337ba73626178c71f8b8 Reviewed-on: https://pdfium-review.googlesource.com/26470 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
2018-02-12Convert CFX_BmpDecompressor to use CFX_MemoryStreamRyan Harrison
This also adds a Seek method to CFX_MemoryStream BUG=pdfium:1007 Change-Id: I2c7e1d3b6d8aff36e302014cb2e8ffc0f23ef7c4 Reviewed-on: https://pdfium-review.googlesource.com/26230 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-02-07Remove some deprecated RenderPage method usage.Lei Zhang
Do some additional checks in test cases where pages were rendered but the resulting bitmap was immediately destroyed. Change-Id: I2f4678140cdc672ab4ced70f748135464447ff59 Reviewed-on: https://pdfium-review.googlesource.com/25510 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-02-07Clean up RenderPage methods in EmbedderTest.Lei Zhang
Add replacement methods that make themselves clear as to what they are rendering, and return unique_ptrs to help prevent leakage. Mark existing methods deprecated. Change-Id: I9055407e614dfbe765428fb32a7da64df3418d1d Reviewed-on: https://pdfium-review.googlesource.com/25470 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-02-07Check that request sizes in ReadData don't overflowRyan Harrison
When a very large, bogus value, was being passed in for the number of bytes to read, this could cause an overflow in the check for if there is data available. BUG=chromium:809824 Change-Id: I54af6655b61d39275f3ae6fabb27be2bee3fef05 Reviewed-on: https://pdfium-review.googlesource.com/25871 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Break unneeded dep on Bmp codec in Gif codecRyan Harrison
BUG=pdfium:1006 Change-Id: I84d2a13ac7b24e7f2f5cba8765d6433860241b58 Reviewed-on: https://pdfium-review.googlesource.com/25710 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Account for skip size before getting image ifh sizeRyan Harrison
BUG=chromium:808336 Change-Id: I84443a00e2ebaf0a1e8590464486ec92bcb0e3b5 Reviewed-on: https://pdfium-review.googlesource.com/25690 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Extract classes in fx_bmp.h into their own filesRyan Harrison
BUG=chromium:808336 Change-Id: I3201805a374b5403149eca701714ef4369a2e337 Reviewed-on: https://pdfium-review.googlesource.com/25630 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Convert BMP class name style to match other codecsRyan Harrison
BMPDecompressor -> CFX_BmpDecompressor CBmpContext -> CFX_BmpContext BUG=chromium:808336 Change-Id: If8ef5294171e3619ae1d7c5175ddf23b7673ec78 Reviewed-on: https://pdfium-review.googlesource.com/25611 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Move core/fxcodec/lbmp/ -> core/fxcodec/bmp/Ryan Harrison
BUG=chromium:808336 Change-Id: Id721787dd77d1bcac6daf6e3c149f79e8d1d9fe4 Reviewed-on: https://pdfium-review.googlesource.com/25610 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-06Changing the member naming style in BMPDecompressorRyan Harrison
Currently there is no indication in the name of it being a member variable and the capitalization is inconsistent. This CL brings them all into line with Chromium style. BUG=chromium:808336 Change-Id: Iaed0272b69350f316371a67eb513934a0169f451 Reviewed-on: https://pdfium-review.googlesource.com/25430 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-02-05Limit dest buffer to 1GB in FlateOrLZWDecode.Henrique Nakashima
Bug: chromium:802094 Change-Id: I99d2d75cd431afe1cdb966e1431143ab43dd9a73 Reviewed-on: https://pdfium-review.googlesource.com/24730 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-30Check if opj_image_data_alloc returned null.Henrique Nakashima
Bug: chromium:797726 Change-Id: Ib13d5a4a78de462f1257f1103728f2a4111cb916 Reviewed-on: https://pdfium-review.googlesource.com/24510 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-30Revert "Revert "Use UnownedPtr instead of T* in MaybeOwned.""Tom Sepez
This reverts commit 77d8ed02c7e97471ceccee5abbabeb2fdea413c7. Reason for revert: <INSERT REASONING HERE> Original change's description: > Revert "Use UnownedPtr instead of T* in MaybeOwned." > > This reverts commit e563e8352139e4852a955e319023b09f2844aee9. > > Reason for revert: <INSERT REASONING HERE> > > Original change's description: > > Use UnownedPtr instead of T* in MaybeOwned. > > > > Always check the liftime in the unowned case. Doing so unearthed > > the following issues: > > > > Transient lifetime issue in jbig2_image when doing realloc(). > > Stale (but unused) dictionary pointer in CPDF_Image. > > Destruction order in error branch in cpdf_dibsource.cpp > > > > Change-Id: I12b758aafeefedc7abe1e8b21a18db959929e95f > > Reviewed-on: https://pdfium-review.googlesource.com/24552 > > Commit-Queue: Tom Sepez <tsepez@chromium.org> > > Reviewed-by: dsinclair <dsinclair@chromium.org> > > TBR=thestig@chromium.org,tsepez@chromium.org,dsinclair@chromium.org > > Change-Id: I3c56ee6ab502da90e3adb7507dbc8cc92f090140 > No-Presubmit: true > No-Tree-Checks: true > No-Try: true > Reviewed-on: https://pdfium-review.googlesource.com/24670 > Reviewed-by: Tom Sepez <tsepez@chromium.org> > Commit-Queue: Tom Sepez <tsepez@chromium.org> TBR=thestig@chromium.org,tsepez@chromium.org,dsinclair@chromium.org Change-Id: I0ccbbeab8be6cadc9b3a5bfefe2aca733654342f No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://pdfium-review.googlesource.com/24671 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-01-30Revert "Use UnownedPtr instead of T* in MaybeOwned."Tom Sepez
This reverts commit e563e8352139e4852a955e319023b09f2844aee9. Reason for revert: <INSERT REASONING HERE> Original change's description: > Use UnownedPtr instead of T* in MaybeOwned. > > Always check the liftime in the unowned case. Doing so unearthed > the following issues: > > Transient lifetime issue in jbig2_image when doing realloc(). > Stale (but unused) dictionary pointer in CPDF_Image. > Destruction order in error branch in cpdf_dibsource.cpp > > Change-Id: I12b758aafeefedc7abe1e8b21a18db959929e95f > Reviewed-on: https://pdfium-review.googlesource.com/24552 > Commit-Queue: Tom Sepez <tsepez@chromium.org> > Reviewed-by: dsinclair <dsinclair@chromium.org> TBR=thestig@chromium.org,tsepez@chromium.org,dsinclair@chromium.org Change-Id: I3c56ee6ab502da90e3adb7507dbc8cc92f090140 No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://pdfium-review.googlesource.com/24670 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-01-30Use UnownedPtr instead of T* in MaybeOwned.Tom Sepez
Always check the liftime in the unowned case. Doing so unearthed the following issues: Transient lifetime issue in jbig2_image when doing realloc(). Stale (but unused) dictionary pointer in CPDF_Image. Destruction order in error branch in cpdf_dibsource.cpp Change-Id: I12b758aafeefedc7abe1e8b21a18db959929e95f Reviewed-on: https://pdfium-review.googlesource.com/24552 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-29Remove duplicate assignments in sycc420_to_rgb().Lei Zhang
BUG=chromium:805881 Change-Id: I3b4914325833c859285a4af1f6e326872cbf1b18 Reviewed-on: https://pdfium-review.googlesource.com/24091 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-26Fix potential memory leak in CCodec_JpegModule::Start().Lei Zhang
BUG=chromium:805881 Change-Id: I91266367296218998d011dd5f62e0b4c6df291a3 Reviewed-on: https://pdfium-review.googlesource.com/24070 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-01-19Remove code added in by a bad rebase or mergechromium/3328chromium/3327chromium/3326Ryan Harrison
The guard being removed was moved lower down in the code, but it appears the original creeped back in while I was rebasing at some point. This is causing clusterfuzz failures. BUG=chromium:803732,chromium:803735 Change-Id: I5bcc6046e64d6060a674f390e243dd8eda9d1d17 Reviewed-on: https://pdfium-review.googlesource.com/23250 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-18Avoid integer overflows in CJBig2_Image::composeTo_opt2().Lei Zhang
BUG=chromium:802983 Change-Id: I866ece9c370bf05571b76b50ad23598f5038332b Reviewed-on: https://pdfium-review.googlesource.com/23151 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
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>
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