integrate lzma

[zpackage] / lzma / check / crc32_tablegen.c

diff --git a/lzma/check/crc32_tablegen.c b/lzma/check/crc32_tablegen.c
new file mode 100644 (file)
index 0000000..44bd668
--- /dev/null
+++ b/lzma/check/crc32_tablegen.c
@@ -0,0 +1,117 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       crc32_tablegen.c
+/// \brief      Generate crc32_table_le.h and crc32_table_be.h
+///
+/// Compiling: gcc -std=c99 -o crc32_tablegen crc32_tablegen.c
+/// Add -DWORDS_BIGENDIAN to generate big endian table.
+/// Add -DLZ_HASH_TABLE to generate lz_encoder_hash_table.h (little endian).
+//
+//  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 uint32_t crc32_table[8][256];
+
+
+static void
+init_crc32_table(void)
+{
+       static const uint32_t poly32 = UINT32_C(0xEDB88320);
+
+       for (size_t s = 0; s < 8; ++s) {
+               for (size_t b = 0; b < 256; ++b) {
+                       uint32_t r = s == 0 ? b : crc32_table[s - 1][b];
+
+                       for (size_t i = 0; i < 8; ++i) {
+                               if (r & 1)
+                                       r = (r >> 1) ^ poly32;
+                               else
+                                       r >>= 1;
+                       }
+
+                       crc32_table[s][b] = r;
+               }
+       }
+
+#ifdef WORDS_BIGENDIAN
+       for (size_t s = 0; s < 8; ++s)
+               for (size_t b = 0; b < 256; ++b)
+                       crc32_table[s][b] = bswap32(crc32_table[s][b]);
+#endif
+
+       return;
+}
+
+
+static void
+print_crc32_table(void)
+{
+       printf("/* This file has been automatically generated by "
+                       "crc32_tablegen.c. */\n\n"
+                       "const uint32_t lzma_crc32_table[8][256] = {\n\t{");
+
+       for (size_t s = 0; s < 8; ++s) {
+               for (size_t b = 0; b < 256; ++b) {
+                       if ((b % 4) == 0)
+                               printf("\n\t\t");
+
+                       printf("0x%08" PRIX32, crc32_table[s][b]);
+
+                       if (b != 255)
+                               printf(",%s", (b+1) % 4 == 0 ? "" : " ");
+               }
+
+               if (s == 7)
+                       printf("\n\t}\n};\n");
+               else
+                       printf("\n\t}, {");
+       }
+
+       return;
+}
+
+
+static void
+print_lz_table(void)
+{
+       printf("/* This file has been automatically generated by "
+                       "crc32_tablegen.c. */\n\n"
+                       "const uint32_t lzma_lz_hash_table[256] = {");
+
+       for (size_t b = 0; b < 256; ++b) {
+               if ((b % 4) == 0)
+                       printf("\n\t");
+
+               printf("0x%08" PRIX32, crc32_table[0][b]);
+
+               if (b != 255)
+                       printf(",%s", (b+1) % 4 == 0 ? "" : " ");
+       }
+
+       printf("\n};\n");
+
+       return;
+}
+
+
+int
+main(void)
+{
+       init_crc32_table();
+
+#ifdef LZ_HASH_TABLE
+       print_lz_table();
+#else
+       print_crc32_table();
+#endif
+
+       return 0;
+}