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74 lines
2.7 KiB
Markdown
74 lines
2.7 KiB
Markdown
LZ4 - Library Files
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================================
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The `/lib` directory contains many files, but depending on project's objectives,
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not all of them are necessary.
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#### Minimal LZ4 build
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The minimum required is **`lz4.c`** and **`lz4.h`**,
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which provides the fast compression and decompression algorithm.
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They generate and decode data using [LZ4 block format].
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#### High Compression variant
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For more compression ratio at the cost of compression speed,
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the High Compression variant called **lz4hc** is available.
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Add files **`lz4hc.c`** and **`lz4hc.h`**.
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The variant still depends on regular `lib/lz4.*` source files.
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#### Frame variant, for interoperability
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In order to produce compressed data compatible with `lz4` command line utility,
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it's necessary to encode lz4-compressed blocks using the [official interoperable frame format].
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This format is generated and decoded automatically by the **lz4frame** library.
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Its public API is described in `lib/lz4frame.h`.
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In order to work properly, lz4frame needs all other modules present in `/lib`,
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including, lz4 and lz4hc, and also **xxhash**.
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So it's necessary to include all `*.c` and `*.h` files present in `/lib`.
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#### Advanced / Experimental API
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A complex API defined in `lz4frame_static.h` contains definitions
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which are not guaranteed to remain stable in future versions.
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As a consequence, it must be used with static linking ***only***.
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#### Windows : using MinGW+MSYS to create DLL
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DLL can be created using MinGW+MSYS with the `make liblz4` command.
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This command creates `dll\liblz4.dll` and the import library `dll\liblz4.lib`.
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The import library is only required with Visual C++.
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The header files `lz4.h`, `lz4hc.h`, `lz4frame.h` and the dynamic library
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`dll\liblz4.dll` are required to compile a project using gcc/MinGW.
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The dynamic library has to be added to linking options.
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It means that if a project that uses LZ4 consists of a single `test-dll.c`
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file it should be linked with `dll\liblz4.dll`. For example:
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```
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gcc $(CFLAGS) -Iinclude/ test-dll.c -o test-dll dll\liblz4.dll
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```
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The compiled executable will require LZ4 DLL which is available at `dll\liblz4.dll`.
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#### Miscellaneous
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Other files present in the directory are not source code. There are :
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- `LICENSE` : contains the BSD license text
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- `Makefile` : `make` script to compile and install lz4 library (static and dynamic)
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- `liblz4.pc.in` : for `pkg-config` (used in `make install`)
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- `README.md` : this file
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[official interoperable frame format]: ../doc/lz4_Frame_format.md
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[LZ4 block format]: ../doc/lz4_Block_format.md
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#### License
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All source material within __lib__ directory are BSD 2-Clause licensed.
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See [LICENSE](LICENSE) for details.
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The license is also reminded at the top of each source file.
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