integrate lzma

[zpackage] / lzma / lzma / fastpos_tablegen.c

diff --git a/lzma/lzma/fastpos_tablegen.c b/lzma/lzma/fastpos_tablegen.c
new file mode 100644 (file)
index 0000000..c97e6f4
--- /dev/null
+++ b/lzma/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;
+}