VP8BitReader
.
Reasoning: Analysis of initialization (`VP8BitReaderSetBuffer`) and usage sites (`src/utils/bit_reader_utils.c:59-61`, `src/utils/bit_reader_inl_utils.h:87`, `src/utils/bit_reader_utils.c:102`) showed: - `buf` is the current read pointer, iterating towards `buf_end`. - `buf_end` points one past the end of valid data (`start + size`). - `buf_max` points to the last position for a safe read of `lbit_t`. - All three pointers relate to the same buffer and are adjusted together in `VP8RemapBitReader`. Annotations applied: - `buf` is annotated `__ended_by(buf_end)` as it iterates up to `buf_end`. - Self-assignments `br->buf_end = br->buf_end;` are added where `br->buf` is modified to satisfy the compiler check for `__ended_by` when the pointer is updated but the end bound remains the same. - `buf_max` is annotated `__unsafe_indexable` because its arithmetic in `VP8RemapBitReader` couldn't be easily expressed with other annotations without ABI changes, and it's mainly adjusted during setup/remapping. - The `start` parameters in `VP8BitReaderSetBuffer` (`src/utils/bit_reader_utils.h:116`, `src/utils/bit_reader_utils.c:34`) `VP8InitBitReader` (`src/utils/bit_reader_utils.h:113`, and `src/utils/bit_reader_utils.c:45`) are annotated `__counted_by(size)` because they receive a buffer start and size, and `start` using `size` within `VP8BitReaderSetBuffer`. This resolved errors arithmetic is performed on within the function and a subsequent warning when calling it from `VP8InitBitReader`. Bug: 432511821 Change-Id: Ica436d9764b5bd1f7dcf1b54a280b6f60ecef4df
WebP Codec
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WebP codec is a library to encode and decode images in WebP format. This package contains the library that can be used in other programs to add WebP support, as well as the command line tools 'cwebp' and 'dwebp' to compress and decompress images respectively.
See https://developers.google.com/speed/webp for details on the image format.
The latest source tree is available at https://chromium.googlesource.com/webm/libwebp
It is released under the same license as the WebM project. See https://www.webmproject.org/license/software/ or the "COPYING" file for details. An additional intellectual property rights grant can be found in the file PATENTS.
Building
See the building documentation.
Encoding and Decoding Tools
The examples/ directory contains tools to encode and decode images and animations, view information about WebP images, and more. See the tools documentation.
APIs
See the APIs documentation, and API usage examples in the
examples/
directory.
Bugs
Please report all bugs to the issue tracker. For security reports, select 'Security report' from the Template dropdown.
Patches welcome! See how to contribute.
Discuss
Email: webp-discuss@webmproject.org
Web: https://groups.google.com/a/webmproject.org/group/webp-discuss