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| -rw-r--r-- | src/zstd/doc/educational_decoder/README.md | 29 |
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diff --git a/src/zstd/doc/educational_decoder/README.md b/src/zstd/doc/educational_decoder/README.md new file mode 100644 index 00000000..e3b9bf58 --- /dev/null +++ b/src/zstd/doc/educational_decoder/README.md @@ -0,0 +1,29 @@ +Educational Decoder +=================== + +`zstd_decompress.c` is a self-contained implementation in C99 of a decoder, +according to the [Zstandard format specification]. +While it does not implement as many features as the reference decoder, +such as the streaming API or content checksums, it is written to be easy to +follow and understand, to help understand how the Zstandard format works. +It's laid out to match the [format specification], +so it can be used to understand how complex segments could be implemented. +It also contains implementations of Huffman and FSE table decoding. + +[Zstandard format specification]: https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md +[format specification]: https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md + +`harness.c` provides a simple test harness around the decoder: + + harness <input-file> <output-file> [dictionary] + +As an additional resource to be used with this decoder, +see the `decodecorpus` tool in the [tests] directory. +It generates valid Zstandard frames that can be used to verify +a Zstandard decoder implementation. +Note that to use the tool to verify this decoder implementation, +the --content-size flag should be set, +as this decoder does not handle streaming decoding, +and so it must know the decompressed size in advance. + +[tests]: https://github.com/facebook/zstd/blob/dev/tests/ |