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The whole point of this wrapper method is to disallow partial
reads, so name it accordingly.
No functional change.
Change-Id: Ia2e7ee756192615f399369d5b077b836438befb2
Reviewed-on: https://pdfium-review.googlesource.com/42150
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
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It's always passed as nullptr. It's a good thing, too, since it looks
like some of the implementations are returning a wrong pointer.
Add some missing |const|s.
Change-Id: I768048fdfe4cdd1dc838fee26fec18e024e39920
Reviewed-on: https://pdfium-review.googlesource.com/41810
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
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There are also small tweaks in tests to ensure strict order of
stack variable lifetimes.
Change-Id: Ic9d5c6a2bdd378b517be627f8e29f725bafdc2ad
Reviewed-on: https://pdfium-review.googlesource.com/41310
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
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This class is much simpler than CFX_MemoryStream and does only what
CFX_BmpDecompressor and CFX_GifContext needs. Swap out CFX_MemoryStream
and remove CFX_MemoryStream::Seek().
BUG=pdfium:263
Change-Id: Ifd8ce4d2b6c9fedd6ec842d46f54fc8e654fbca7
Reviewed-on: https://pdfium-review.googlesource.com/39880
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
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BUG=pdfium:1007
Change-Id: Ib8aecf2e4833f22a4288f6e1381edc11d114c865
Reviewed-on: https://pdfium-review.googlesource.com/31952
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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