initial commit

SQUASHFS/squashfs-tools-4.4/squashfs-tools/swap.c

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+/*
+ * Copyright (c) 2009, 2010
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * swap.c
+ */
+
+#ifndef linux
+#define __BYTE_ORDER BYTE_ORDER
+#define __BIG_ENDIAN BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#else
+#include <endian.h>
+#endif
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+void swap_le16(void *src, void *dest)
+{
+	unsigned char *s = src;
+	unsigned char *d = dest;
+
+	d[0] = s[1];
+	d[1] = s[0];
+}
+
+
+void swap_le32(void *src, void *dest)
+{
+	unsigned char *s = src;
+	unsigned char *d = dest;
+
+	d[0] = s[3];
+	d[1] = s[2];
+	d[2] = s[1];
+	d[3] = s[0];
+}
+
+
+void swap_le64(void *src, void *dest)
+{
+	unsigned char *s = src;
+	unsigned char *d = dest;
+
+	d[0] = s[7];
+	d[1] = s[6];
+	d[2] = s[5];
+	d[3] = s[4];
+	d[4] = s[3];
+	d[5] = s[2];
+	d[6] = s[1];
+	d[7] = s[0];
+}
+
+
+unsigned short inswap_le16(unsigned short num)
+{
+	return (num >> 8) |
+		((num & 0xff) << 8);
+}
+
+
+unsigned int inswap_le32(unsigned int num)
+{
+	return (num >> 24) |
+		((num & 0xff0000) >> 8) |
+		((num & 0xff00) << 8) |
+		((num & 0xff) << 24);
+}
+
+
+long long inswap_le64(long long n)
+{
+	unsigned long long num = n;
+
+	return (num >> 56) |
+		((num & 0xff000000000000LL) >> 40) |
+		((num & 0xff0000000000LL) >> 24) |
+		((num & 0xff00000000LL) >> 8) |
+		((num & 0xff000000) << 8) |
+		((num & 0xff0000) << 24) |
+		((num & 0xff00) << 40) |
+		((num & 0xff) << 56);
+}
+
+
+#define SWAP_LE_NUM(BITS) \
+void swap_le##BITS##_num(void *s, void *d, int n) \
+{\
+	int i;\
+	for(i = 0; i < n; i++, s += BITS / 8, d += BITS / 8)\
+		swap_le##BITS(s, d);\
+}
+
+SWAP_LE_NUM(16)
+SWAP_LE_NUM(32)
+SWAP_LE_NUM(64)
+
+#define INSWAP_LE_NUM(BITS, TYPE) \
+void inswap_le##BITS##_num(TYPE *s, int n) \
+{\
+	int i;\
+	for(i = 0; i < n; i++)\
+		s[i] = inswap_le##BITS(s[i]);\
+}
+
+INSWAP_LE_NUM(16, unsigned short)
+INSWAP_LE_NUM(32, unsigned int)
+INSWAP_LE_NUM(64, long long)
+#endif