integrate lzma

[zpackage] / lzma / check / crc64_tablegen.c

diff --git a/lzma/check/crc64_tablegen.c b/lzma/check/crc64_tablegen.c
new file mode 100644 (file)
index 0000000..40fcf49
--- /dev/null
+++ b/lzma/check/crc64_tablegen.c
@@ -0,0 +1,88 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       crc64_tablegen.c
+/// \brief      Generate crc64_table_le.h and crc64_table_be.h
+///
+/// Compiling: gcc -std=c99 -o crc64_tablegen crc64_tablegen.c
+/// Add -DWORDS_BIGENDIAN to generate big endian table.
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include "tuklib_integer.h"
+
+
+static uint64_t crc64_table[4][256];
+
+
+extern void
+init_crc64_table(void)
+{
+       static const uint64_t poly64 = UINT64_C(0xC96C5795D7870F42);
+
+       for (size_t s = 0; s < 4; ++s) {
+               for (size_t b = 0; b < 256; ++b) {
+                       uint64_t r = s == 0 ? b : crc64_table[s - 1][b];
+
+                       for (size_t i = 0; i < 8; ++i) {
+                               if (r & 1)
+                                       r = (r >> 1) ^ poly64;
+                               else
+                                       r >>= 1;
+                       }
+
+                       crc64_table[s][b] = r;
+               }
+       }
+
+#ifdef WORDS_BIGENDIAN
+       for (size_t s = 0; s < 4; ++s)
+               for (size_t b = 0; b < 256; ++b)
+                       crc64_table[s][b] = bswap64(crc64_table[s][b]);
+#endif
+
+       return;
+}
+
+
+static void
+print_crc64_table(void)
+{
+       printf("/* This file has been automatically generated by "
+                       "crc64_tablegen.c. */\n\n"
+                       "const uint64_t lzma_crc64_table[4][256] = {\n\t{");
+
+       for (size_t s = 0; s < 4; ++s) {
+               for (size_t b = 0; b < 256; ++b) {
+                       if ((b % 2) == 0)
+                               printf("\n\t\t");
+
+                       printf("UINT64_C(0x%016" PRIX64 ")",
+                                       crc64_table[s][b]);
+
+                       if (b != 255)
+                               printf(",%s", (b+1) % 2 == 0 ? "" : " ");
+               }
+
+               if (s == 3)
+                       printf("\n\t}\n};\n");
+               else
+                       printf("\n\t}, {");
+       }
+
+       return;
+}
+
+
+int
+main(void)
+{
+       init_crc64_table();
+       print_crc64_table();
+       return 0;
+}