X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=lzma%2Flzma%2Ffastpos_tablegen.c;fp=lzma%2Flzma%2Ffastpos_tablegen.c;h=c97e6f411c2774aad309bcd70851ec7644f40d9a;hb=32b8a6b26ed8843828e03e505d2256960bda0980;hp=0000000000000000000000000000000000000000;hpb=d48fc23a4bcf8ca3c406d6e8c8a6f8c6b0fa2f1e;p=zpackage

diff --git a/lzma/lzma/fastpos_tablegen.c b/lzma/lzma/fastpos_tablegen.c
new file mode 100644
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;
+}