| 1 | # Single File Zstandard Libraries |
| 2 | |
| 3 | The script `combine.sh` creates an _amalgamated_ source file that can be used with or without `zstd.h`. This isn't a _header-only_ file but it does offer a similar level of simplicity when integrating into a project. |
| 4 | |
| 5 | All it now takes to support Zstd in your own projects is the addition of a single file, two if using the header, with no configuration or further build steps. |
| 6 | |
| 7 | Decompressor |
| 8 | ------------ |
| 9 | |
| 10 | This is the most common use case. The decompression library is small, adding, for example, 26kB to an Emscripten compiled WebAssembly project. Native implementations add a little more, 40-70kB depending on the compiler and platform. |
| 11 | |
| 12 | Create `zstddeclib.c` from the Zstd source using: |
| 13 | ``` |
| 14 | cd zstd/build/single_file_libs |
| 15 | python3 combine.py -r ../../lib -x legacy/zstd_legacy.h -o zstddeclib.c zstddeclib-in.c |
| 16 | ``` |
| 17 | Then add the resulting file to your project (see the [example files](examples)). |
| 18 | |
| 19 | `create_single_file_decoder.sh` will run the above script, creating the file `zstddeclib.c` (`build_decoder_test.sh` will also create `zstddeclib.c`, then compile and test the result). |
| 20 | |
| 21 | Full Library |
| 22 | ------------ |
| 23 | |
| 24 | The same tool can amalgamate the entire Zstd library for ease of adding both compression and decompression to a project. The [roundtrip example](examples/roundtrip.c) uses the original `zstd.h` with the remaining source files combined into `zstd.c` (currently just over 1.2MB) created from `zstd-in.c`. As with the standalone decoder the most useful compile flags have already been rolled-in and the resulting file can be added to a project as-is. |
| 25 | |
| 26 | Create `zstd.c` from the Zstd source using: |
| 27 | ``` |
| 28 | cd zstd/build/single_file_libs |
| 29 | python3 combine.py -r ../../lib -x legacy/zstd_legacy.h -k zstd.h -o zstd.c zstd-in.c |
| 30 | ``` |
| 31 | It's possible to create a compressor-only library but since the decompressor is so small in comparison this doesn't bring much of a gain (but for the curious, simply remove the files in the _decompress_ section at the end of `zstd-in.c`). |
| 32 | |
| 33 | `create_single_file_library.sh` will run the script to create `zstd.c` (`build_library_test.sh` will also create `zstd.c`, then compile and test the result). |