summaryrefslogtreecommitdiff
path: root/fxbarcode
AgeCommit message (Collapse)Author
2018-10-12Split most core build rules into various BUILD.gn files in core.Lei Zhang
Change-Id: I773eec2bbf104f073eba7a64ed19f6fba0131d21 Reviewed-on: https://pdfium-review.googlesource.com/c/43946 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-10-12Split fxbarcode build rules into fxbarcode/BUILD.gn.Lei Zhang
Enable GN check for fxbarcode and make it pass. Change-Id: I696a97b90113b65ae5c7f8aa18185328c4640251 Reviewed-on: https://pdfium-review.googlesource.com/c/43940 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-10-09Do IWYU for ptr_util.h.Lei Zhang
Change-Id: Ib96a66eb47bea791f061e1d6da8aadad8037a99d Reviewed-on: https://pdfium-review.googlesource.com/c/43609 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
2018-10-09Kill off some memset()s following FX_Alloc()Tom Sepez
Change-Id: I92aa74c86aef890fcb991f039b9707d680fdb83c Reviewed-on: https://pdfium-review.googlesource.com/c/43652 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-10-01Remove some "exceptions" from reedsolomon code.Lei Zhang
Change-Id: If8c45af624ed6df7b6d7416bb4e195f4097b0574 Reviewed-on: https://pdfium-review.googlesource.com/43191 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-09-25Optimize MaybeEmbedPositionAdjustmentPatterns().chromium/3563chromium/3562Lei Zhang
Change-Id: I547288c19c714a8222af89e0499d6786dad917c7 Reviewed-on: https://pdfium-review.googlesource.com/42457 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
2018-09-25Get rid of "exceptions" in CBC_QRCoderMatrixUtil.Lei Zhang
Change-Id: I186e39c60a2e87983f05a3407b668e15160c2372 Reviewed-on: https://pdfium-review.googlesource.com/42456 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-09-22Change CBC_QRCoderMatrixUtil::BuildMatrix() to return a bool.Lei Zhang
Fix caller code and remove some impossible to reach code inside CBC_QRCoderMatrixUtil. Change-Id: I3b0cc0750784e806ba4050fb2487675dee4ee8c3 Reviewed-on: https://pdfium-review.googlesource.com/42455 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-09-22Encapsulate CBC_QRCoderMatrixUtil code.Lei Zhang
Change-Id: I82ae8d25f0af74724bffa8177300148afc2286e4 Reviewed-on: https://pdfium-review.googlesource.com/42470 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-09-22Remove CBC_CommonByteArray and CBC_QRCoderBlockPair.Lei Zhang
CBC_CommonByteArray is just a std::vector. CBC_QRCoderBlockPair is just a struct with two vectors. Change-Id: I9e5fdab18f07a1cff7ee486dfce619f9391c80dc Reviewed-on: https://pdfium-review.googlesource.com/42454 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Wei Li <weili@chromium.org>
2018-09-20Remove many unneeded STL #includes from headers.Lei Zhang
Change-Id: I7010cedee8d17d05b2c37a94d767e6f3a9c48f7d Reviewed-on: https://pdfium-review.googlesource.com/42790 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-17Make CBC_CodeBase::SetWideNarrowRatio() not virtual.Lei Zhang
Make CBC_Writer::SetWideNarrowRatio() virtual instead. Do the same for SetStartChar(), SetEndChar(), and SetErrorCorrectionLevel(). Change-Id: I70e87c0e9f8b772331105e57dd26075db3cfcb95 Reviewed-on: https://pdfium-review.googlesource.com/42602 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-09-17Make CBC_CodeBase::SetTextLocation() not virtual.Lei Zhang
Make CBC_Writer::SetTextLocation() virtual instead. Change-Id: I9ac06affe35f3c7bebc2f5ff0917e7146cfe89cc Reviewed-on: https://pdfium-review.googlesource.com/42601 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-09-17Fix final/protected conflicts.Tom Sepez
Classes marked |final| should not have |protected| members. In turn, "private field m_dwEncryptObjNum is not used" warning is produced. Change-Id: I51a96aca5a5f499381a6764d892962f7f2dc0327 Reviewed-on: https://pdfium-review.googlesource.com/42611 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-09-17Make CBC_CodeBase::SetTextLocation() virtual.Lei Zhang
Do the same for a few other CBC_CodeBase methods, instead of trying to implement virtual methods manually using memory pointers. Change-Id: Iec0e3a4f8eabc54962c7ac0a00a1b80b192ff474 Reviewed-on: https://pdfium-review.googlesource.com/42600 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-17Initialize some 1D barcode classes in the header.Lei Zhang
Change-Id: Iaeb7f43e442ace403f1522268e63b1a59f223a9d Reviewed-on: https://pdfium-review.googlesource.com/42599 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-17Remove BCExceptionInvalidateCharacter.Lei Zhang
Change-Id: Ia165095864ffe2865a5e433d09d0bccad1164d2c Reviewed-on: https://pdfium-review.googlesource.com/42453 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-15Remove FXFM_ENCODING_NONE.Lei Zhang
FX_CreateFontEncodingEx() always passes FXFM_ENCODING_NONE. Just get rid of it instead. Change-Id: I417f84d8ae2f10ba874265a92576d3ef8481a9d6 Reviewed-on: https://pdfium-review.googlesource.com/42460 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-15Remove dead CBC_QRCoderEncoder code.Lei Zhang
Change-Id: I096ba8681d779bb0cc1d7aaaedcd9f68020d5b37 Reviewed-on: https://pdfium-review.googlesource.com/42452 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-14Initialize CBC_OneDimWriter members in the header.Lei Zhang
Rearrange them as well. Change-Id: I8653004cd06a4054e32d0148adc1400029ceb34e Reviewed-on: https://pdfium-review.googlesource.com/42459 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-09-11Small optimizations for CBC_HighLevelEncoder::lookAheadTestchromium/3550Ryan Harrison
Currently ClusterFuzz is timing out when running cases that cause a large number of calls to this method. Looking at the cases, I believe these to be valid calls, so this CL attempts to lower the cost of making each individual call. Adds in pre-allocation of a vector that has a fixed size and uses a const-ref for passing in |msg| to avoid copying. BUG=chromium:881678 Change-Id: I61ec4dc96e79c84def5b10102cc58a96773ce07f Reviewed-on: https://pdfium-review.googlesource.com/42230 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-08-27The final game: mark everything final.Tom Sepez
Then revert the ones that break compilation. Fix one IWYU noticed during presubmit. Change-Id: I881a8a72818e55dbc4816247e35ff5e3015194e7 Reviewed-on: https://pdfium-review.googlesource.com/41470 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-08-23Remove CBC_BarcodeMatrix::m_matrixOut and just return the bit array.Henrique Nakashima
Change-Id: I12893784321f92e5cac2b80653897007b6e63c7e Reviewed-on: https://pdfium-review.googlesource.com/41111 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-08-23Swap width and height params in CBC_BarcodeMatrix constructor.Henrique Nakashima
Change-Id: I74f3a147914c6483e7d443cff70e09115c424ca5 Reviewed-on: https://pdfium-review.googlesource.com/41091 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-08-23Reorder RenderResult and RenderDeviceResult in CBC_TwoDimWriter.chromium/3532Henrique Nakashima
They should appear in the order that they are necessarily called. Change-Id: I6901d384122003f72b0c43bf1df6260e2e196a7d Reviewed-on: https://pdfium-review.googlesource.com/41050 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-08-23Remove m_bTruncated flag from CBC_PDF417Writer.Henrique Nakashima
The flag is unused. Change-Id: I15eb3e20e6a632ae2aa2afc19cb09d2402e607e0 Reviewed-on: https://pdfium-review.googlesource.com/41031 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-08-22Remove m_currentRow from the state of CBC_BarcodeMatrix.Henrique Nakashima
Change-Id: I2003d32f3f6972c0102b37ad545316a76b09fd1f Reviewed-on: https://pdfium-review.googlesource.com/41030 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-08-22Simplify internal state of CBC_BarcodeMatrix.Henrique Nakashima
Change-Id: Icd66f42c240984df6821c2bae640bbfacfa62ad2 Reviewed-on: https://pdfium-review.googlesource.com/41010 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-08-22Remove unused barcode matrix scaling code.Henrique Nakashima
Change-Id: Id15088a40fd308ba91317e95a6fa8075e7306608 Reviewed-on: https://pdfium-review.googlesource.com/40992 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-22Change in/out params in CBC_PDF417Writer::Encode to only out.Henrique Nakashima
The value passed was always 0. This also prevented the scaling from being executed, so that can be removed. Change-Id: I143a9ed31b231d3b9fa297b0bf9dcc0fa6072889 Reviewed-on: https://pdfium-review.googlesource.com/40990 Reviewed-by: Lei Zhang <thestig@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-22Remove unused setters in CBC_BarcodeMatrix and CBC_BarcodeRow.Henrique Nakashima
Change-Id: I01c83d96f07eac776e8269b7d1e06b2b07ca75ea Reviewed-on: https://pdfium-review.googlesource.com/40932 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-21Remove dead code in CBC_CommonBitMatrix.Henrique Nakashima
Change-Id: Ie22666217b040872e576d58d0afa77138bca3870 Reviewed-on: https://pdfium-review.googlesource.com/40931 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-21Remove excessive padding above and below PDF417 barcodes.Henrique Nakashima
Bug: pdfium:1135 Change-Id: Iea16a65a5eebcb914192eb49de17a2c4eda83320 Reviewed-on: https://pdfium-review.googlesource.com/40690 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-08-21Optimize rendering of two dimensional barcodes: defer upscale.Henrique Nakashima
Defer upscaling as late as possible so that intermediary data structures are smaller. Made a couple of changes along the way to preserve the barcode correctness and fix some padding issues. For my example, this is a ~21x improvement in rendering time, down from ~190ms per barcode to ~9ms. Bug: 872907, pdfium:1135 Change-Id: If532e0f168f02fea9c31d473f34c0009da4f4612 Reviewed-on: https://pdfium-review.googlesource.com/40010 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-17Optimize rendering of 2D barcodes: create Rect only on black regions.Henrique Nakashima
This is a ~2x improvement in rendering time, taking my example down from ~390ms per barcode to ~190ms. Bug: 872907 Change-Id: Iecddc30edf92ad943765d4382b332e00d493c320 Reviewed-on: https://pdfium-review.googlesource.com/40533 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-16Allow PDF417 barcodes to reduce modules by shaving off padding.Henrique Nakashima
The way it was working before is: Look at the width and height provided for the barcode. If the maximum number of codewords to fit in that space was within the spec limits (1 <= cols <= 30 and 3 <= rows <= 90), cram as many codewords as possible. The unused space was filled with padding. With this CL, instead look at the amount of content that needs to fit into the barcode and favor fewer codewords rather than as many as possible. Bug: pdfium:1135 Change-Id: Ia96be82ec7c5f4f920cff58def1a44000bf04761 Reviewed-on: https://pdfium-review.googlesource.com/40350 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-08-16If rows need to overflow in a PDF417 barcode, keep it to a minimum.Henrique Nakashima
By using mincols as fallback, the exact opposite is done. Maxcols should be used instead to minimize the size. This is important so the next fix (https://pdfium-review.googlesource.com/c/pdfium/+/40350) does not break a test that was working well by coincidence. Bug: pdfium:1135 Change-Id: I95ddc547654966f655e2556c1796503a5456fb8f Reviewed-on: https://pdfium-review.googlesource.com/40330 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-08-16Optimize rendering of two dimensional barcodes: deduplicate regions.Henrique Nakashima
Reduce the logical size of the barcode by removing unnecessary region duplication. As far as I can tell, the line thickness is useless and the aspect ratio causes arbitrary changes in rounding, but ultimately the dimensions of a barcode are defined by its width and height, rather than by this ratio. The improvement with this CL is from ~580ms to ~390ms per barcode, so about 1.5x. Combined with https://pdfium-review.googlesource.com/c/pdfium/+/40010 the improvement is to ~15ms, which is about 39x. This also fixes the rendering of the barcode in the pixel and corpus tests. You can verify this pointing a barcode reader app at the screen. It does not however fix every case, as the unit test is still unreadable. Bug: 872907, pdfium:1135 Change-Id: Ic28e60f54719552cfe69ace7ebc3f730c338a129 Reviewed-on: https://pdfium-review.googlesource.com/40030 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-08-08Move ByteString::FromUnicode() to WideString::ToDefANSI()Tom Sepez
Turns out that "FromUnicode" is misleading in that, on linux, it simply removes any characters beyond 0xFF and passes the rest unchanged, so no unicode decoding actually takes place. On Windows, it passes it into the system function specifying FX_CODEPAGE_DefANSI, converting it into the so-called "default ANSI code plane", passing some characters, converting others to '?' and still others to 'A'. Either way, nothing resembling UTF8 comes out of this, so pick a better name. These now immediately look suspicious, so a follow-up CL will see which ones should really be WideString::UTF8Encode() instead. Making this a normal method on a widestring rather than a static method on a bytestring feels more natural; this is parallel to the UTF8Encode and UTF16LE_Encode functions. Add a test that shows these conversions. Change-Id: Ia7551b47199eba61b5c328a97bfe9176ac8e583c Reviewed-on: https://pdfium-review.googlesource.com/39690 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-07-17Reserve space for result in ::FilterContentsRyan Harrison
This changes the implementation for the specific bug listed and proactively fixes it in the other overrides. The general bug here is that if you concat a WideString in a tight loop without first reserving space, each call will cause an allocation size change and memcpy. This is very expensive and causes ClusterFuzz cases to timeout. BUG=chromium:863295 Change-Id: I6c1d900a31b98cd9ddcf91d1ec0f3973c9cdfa26 Reviewed-on: https://pdfium-review.googlesource.com/38110 Reviewed-by: Tom Sepez <tsepez@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-07-03Avoid explicit allocs in fxbarcode matrix classes.Tom Sepez
Other cleanups: Remove unused method. Fold Init() into constructor. Return span<> where possible. Change-Id: Ie38d32efb6e63d86ae24e93684903a6dd900810f Reviewed-on: https://pdfium-review.googlesource.com/36810 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>
2018-06-19Move fxcrt::{Byte,Wide}Strings with std::move().chromium/3466Tom Sepez
Remove some string copies in barcode that were noticed whilst looking for moves. Change-Id: Ieda34d00f633576ba1f0dca283dcdabfb36f236c Reviewed-on: https://pdfium-review.googlesource.com/35410 Reviewed-by: dsinclair <dsinclair@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
2018-06-11Remove explicit calls to x->operator[]Tom Sepez
Because its a code smell of a sort. Change-Id: Id1c1b124f539e31a929701fb9486da9d396d3563 Reviewed-on: https://pdfium-review.googlesource.com/34695 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-06-04Fix a number of unused writes in barcode codeRyan Harrison
This fixes a number of instances where a value is written out to a variable, but never used in the barcode. There are three different types of fixes employed in this CL. If the non-use is a bug, then rewrite the code to actually use the value. If it is an assignment with no side effects, then just remove the entire line. Finally if it is an assignment of a function return value, cast it to void instead to clearly mark that the return is being ignored. Issues found with Clang Static Analyzer. Change-Id: If13a3684cb2db81592cce9a798788a26fcdb4c6d Reviewed-on: https://pdfium-review.googlesource.com/33771 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-05-25Reserve space for code words when creating encoder contextRyan Harrison
During encoding, the code is going to walk through every character in m_msg and determine what values need to be added to m_codewords. The ceiling on the number of characters being added to m_codewords is the length of m_msg, so reserving enought space in advance. This prevents thrash related to incrementing the string and thus resizing in a tight loop. BUG=chromium:846027 Change-Id: Icefd6955933f8068feeeee6243e430f60c50d747 Reviewed-on: https://pdfium-review.googlesource.com/32990 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-05-15Clean up CBC_ASCIIEncoder.Lei Zhang
Get rid of a few more fxbarcode exception codes. Change-Id: Ia9c9cdcef581174e25be8dc2fba181915dc6d729 Reviewed-on: https://pdfium-review.googlesource.com/32471 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-04-30Optimize yet another piece of barcode codeRyan Harrison
Rolling two iterations over the input into one, and reserving the maximum possibly output size to avoid memory thrash when appending. Under Valgrind this reduces the instruction count by ~200x BUG=chromium:837610 Change-Id: If12a3b98048b41906a4401d4dcc9470b513e28d2 Reviewed-on: https://pdfium-review.googlesource.com/31731 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-04-23Pre-allocate more string buffers in barcode codeRyan Harrison
Another couple of examples where the slow down in the barcode code can be fixed by reserving and thus pre-allocating the buffer that backs the Widestring. Doing += in a tight loop caused reallocation thrashing. BUG=chromium:834630 Change-Id: I48a802225351bcaf992c324732fddf81639b4898 Reviewed-on: https://pdfium-review.googlesource.com/31230 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
2018-04-12Tidy up types in CBC_PDF417HighLevelEncoderRyan Harrison
Follow up to request in https://pdfium-review.googlesource.com/c/pdfium/+/30190 BUG=chromium:802242 Change-Id: I8fddd78d235a195c9782c3f6ced428de965e85eb Reviewed-on: https://pdfium-review.googlesource.com/30250 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-04-11Reserve space to reduce memory operations while encoding barcodeRyan Harrison
In the test case from the bug, the majority of the time is being spent resizing Widestring internal buffers, since += is being called in a tight loop. Since the size of the input being mutated and stored is known, this CL reserves the space before hand to lower thrashing. This substantially improves runtime of this test case locally. BUG=chromium:802242 Change-Id: I5176dabc94634b4d6bc3e9425fe6469a5bf35a41 Reviewed-on: https://pdfium-review.googlesource.com/30190 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 12:41:27 +0000