From fac10ea799fe9b6158d74f66d6ad46536d38a545 Mon Sep 17 00:00:00 2001
From: Patrick McHardy <kaber@trash.net>
Date: Wed, 18 Mar 2009 04:55:00 +0100
Subject: Initial commit

---
 src/gmputil.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 src/gmputil.c

(limited to 'src/gmputil.c')

diff --git a/src/gmputil.c b/src/gmputil.c
new file mode 100644
index 00000000..f34c077e
--- /dev/null
+++ b/src/gmputil.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <gmp.h>
+
+#include <nftables.h>
+#include <datatype.h>
+#include <gmputil.h>
+#include <utils.h>
+
+void mpz_bitmask(mpz_t rop, unsigned int width)
+{
+	mpz_set_ui(rop, 0);
+	mpz_setbit(rop, width);
+	mpz_sub_ui(rop, rop, 1);
+}
+
+void mpz_init_bitmask(mpz_t rop, unsigned int width)
+{
+	mpz_init2(rop, width);
+	mpz_bitmask(rop, width);
+}
+
+void mpz_prefixmask(mpz_t rop, unsigned int width, unsigned int prefix_len)
+{
+	mpz_bitmask(rop, prefix_len);
+	mpz_lshift_ui(rop, width - prefix_len);
+}
+
+void mpz_lshift_ui(mpz_t rop, unsigned int n)
+{
+	mpz_mul_2exp(rop, rop, n);
+}
+
+void mpz_rshift_ui(mpz_t rop, unsigned int n)
+{
+	mpz_tdiv_q_2exp(rop, rop, n);
+}
+
+#define mpz_get_type(type, endian, op)					\
+({									\
+ 	type ret = 0;							\
+	size_t cnt;							\
+	mpz_export(&ret, &cnt, MPZ_LSWF, sizeof(ret), endian, 0, op);	\
+	assert(cnt <= 1);						\
+ 	ret;								\
+ })
+
+uint64_t mpz_get_uint64(const mpz_t op)
+{
+	return mpz_get_type(uint64_t, MPZ_HOST_ENDIAN, op);
+}
+
+uint32_t mpz_get_uint32(const mpz_t op)
+{
+	return mpz_get_type(uint32_t, MPZ_HOST_ENDIAN, op);
+}
+
+uint16_t mpz_get_uint16(const mpz_t op)
+{
+	return mpz_get_type(uint16_t, MPZ_HOST_ENDIAN, op);
+}
+
+uint8_t mpz_get_uint8(const mpz_t op)
+{
+	return mpz_get_type(uint8_t, MPZ_HOST_ENDIAN, op);
+}
+
+uint64_t mpz_get_be64(const mpz_t op)
+{
+	return mpz_get_type(uint64_t, MPZ_BIG_ENDIAN, op);
+}
+
+uint32_t mpz_get_be32(const mpz_t op)
+{
+	return mpz_get_type(uint32_t, MPZ_BIG_ENDIAN, op);
+}
+
+uint16_t mpz_get_be16(const mpz_t op)
+{
+	return mpz_get_type(uint16_t, MPZ_BIG_ENDIAN, op);
+}
+
+void *mpz_export_data(void *data, const mpz_t op,
+		      enum byteorder byteorder,
+		      unsigned int len)
+{
+	enum mpz_byte_order endian;
+
+	switch (byteorder) {
+	case BYTEORDER_BIG_ENDIAN:
+	default:
+		endian = MPZ_BIG_ENDIAN;
+		break;
+	case BYTEORDER_HOST_ENDIAN:
+		endian = MPZ_HOST_ENDIAN;
+		break;
+	}
+
+	memset(data, 0, len);
+	mpz_export(data, NULL, MPZ_MSWF, len, endian, 0, op);
+	return data;
+}
+
+void mpz_import_data(mpz_t rop, const void *data,
+		     enum byteorder byteorder,
+		     unsigned int len)
+{
+	enum mpz_word_order order;
+	enum mpz_byte_order endian;
+
+	switch (byteorder) {
+	case BYTEORDER_BIG_ENDIAN:
+	default:
+		order  = MPZ_MSWF;
+		endian = MPZ_BIG_ENDIAN;
+		break;
+	case BYTEORDER_HOST_ENDIAN:
+		order  = MPZ_LSWF;
+		endian = MPZ_HOST_ENDIAN;
+		break;
+	}
+
+	mpz_import(rop, len, order, 1, endian, 0, data);
+}
+
+void mpz_switch_byteorder(mpz_t rop, unsigned int len)
+{
+	char data[len];
+
+	mpz_export_data(data, rop, BYTEORDER_BIG_ENDIAN, len);
+	mpz_import_data(rop, data, BYTEORDER_HOST_ENDIAN, len);
+}
+
+static void *gmp_xrealloc(void *ptr, size_t old_size, size_t new_size)
+{
+	return xrealloc(ptr, new_size);
+}
+
+static void __init gmp_init(void)
+{
+	mp_set_memory_functions(xmalloc, gmp_xrealloc, NULL);
+}
-- 
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