aboutsummaryrefslogtreecommitdiffstats
path: root/libinstaller/syslxint.h
diff options
context:
space:
mode:
Diffstat (limited to 'libinstaller/syslxint.h')
-rw-r--r--libinstaller/syslxint.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/libinstaller/syslxint.h b/libinstaller/syslxint.h
new file mode 100644
index 00000000..e296df1d
--- /dev/null
+++ b/libinstaller/syslxint.h
@@ -0,0 +1,74 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2007 H. Peter Anvin - All Rights Reserved
+ *
+ * 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, Inc., 53 Temple Place Ste 330,
+ * Boston MA 02111-1307, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+#ifndef SYSLXINT_H
+#define SYSLXINT_H
+
+#include "syslinux.h"
+
+/*
+ * Access functions for littleendian numbers, possibly misaligned.
+ */
+static inline uint8_t get_8(const unsigned char *p)
+{
+ return *(const uint8_t *)p;
+}
+
+static inline uint16_t get_16(const unsigned char *p)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ /* Littleendian and unaligned-capable */
+ return *(const uint16_t *)p;
+#else
+ return (uint16_t)p[0] + ((uint16_t)p[1] << 8);
+#endif
+}
+
+static inline uint32_t get_32(const unsigned char *p)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ /* Littleendian and unaligned-capable */
+ return *(const uint32_t *)p;
+#else
+ return (uint32_t)p[0] + ((uint32_t)p[1] << 8) +
+ ((uint32_t)p[2] << 16) + ((uint32_t)p[3] << 24);
+#endif
+}
+
+static inline void set_16(unsigned char *p, uint16_t v)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ /* Littleendian and unaligned-capable */
+ *(uint16_t *)p = v;
+#else
+ p[0] = (v & 0xff);
+ p[1] = ((v >> 8) & 0xff);
+#endif
+}
+
+static inline void set_32(unsigned char *p, uint32_t v)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ /* Littleendian and unaligned-capable */
+ *(uint32_t *)p = v;
+#else
+ p[0] = (v & 0xff);
+ p[1] = ((v >> 8) & 0xff);
+ p[2] = ((v >> 16) & 0xff);
+ p[3] = ((v >> 24) & 0xff);
+#endif
+}
+
+#define SECTOR_SHIFT 9 /* 512-byte sectors */
+#define SECTOR_SIZE (1 << SECTOR_SHIFT)
+
+#endif /* SYSLXINT_H */