diff options
Diffstat (limited to 'Utilities/cmliblzma/liblzma/lzma/fastpos_tablegen.c')
-rw-r--r-- | Utilities/cmliblzma/liblzma/lzma/fastpos_tablegen.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/Utilities/cmliblzma/liblzma/lzma/fastpos_tablegen.c b/Utilities/cmliblzma/liblzma/lzma/fastpos_tablegen.c new file mode 100644 index 000000000..c97e6f411 --- /dev/null +++ b/Utilities/cmliblzma/liblzma/lzma/fastpos_tablegen.c @@ -0,0 +1,56 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file fastpos_tablegen.c +/// \brief Generates the lzma_fastpos[] lookup table +/// +// Authors: Igor Pavlov +// Lasse Collin +// +// This file has been put into the public domain. +// You can do whatever you want with this file. +// +/////////////////////////////////////////////////////////////////////////////// + +#include <sys/types.h> +#include <inttypes.h> +#include <stdio.h> +#include "fastpos.h" + + +int +main(void) +{ + uint8_t fastpos[1 << FASTPOS_BITS]; + + const uint8_t fast_slots = 2 * FASTPOS_BITS; + uint32_t c = 2; + + fastpos[0] = 0; + fastpos[1] = 1; + + for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) { + const uint32_t k = 1 << ((slot_fast >> 1) - 1); + for (uint32_t j = 0; j < k; ++j, ++c) + fastpos[c] = slot_fast; + } + + printf("/* This file has been automatically generated " + "by fastpos_tablegen.c. */\n\n" + "#include \"common.h\"\n" + "#include \"fastpos.h\"\n\n" + "const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = {"); + + for (size_t i = 0; i < (1 << FASTPOS_BITS); ++i) { + if (i % 16 == 0) + printf("\n\t"); + + printf("%3u", (unsigned int)(fastpos[i])); + + if (i != (1 << FASTPOS_BITS) - 1) + printf(","); + } + + printf("\n};\n"); + + return 0; +} |