utils: use constant byte-order conversion

[project/libubox.git] / utils.h

diff --git a/utils.h b/utils.h
index 9688a6a..aa480e2 100644 (file)
--- a/utils.h
+++ b/utils.h
@@ -23,6 +23,7 @@
 #include <sys/time.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <unistd.h>
 #include <time.h>
 
 /*
@@ -56,12 +57,14 @@ extern int __BUILD_BUG_ON_CONDITION_FAILED;
 #define BUILD_BUG_ON __BUILD_BUG_ON
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
+#define LIBUBOX_COMPAT_CLOCK_GETTIME
 
-#define CLOCK_REALTIME 0
-#define CLOCK_MONOTONIC        1
+#include <mach/clock_types.h>
+#define CLOCK_REALTIME CALENDAR_CLOCK
+#define CLOCK_MONOTONIC        SYSTEM_CLOCK
 
-void clock_gettime(int type, struct timespec *tv);
+int clock_gettime(int type, struct timespec *tv);
 
 #endif
 
@@ -78,16 +81,10 @@ void clock_gettime(int type, struct timespec *tv);
 #elif defined(__APPLE__)
 #include <machine/endian.h>
 #include <machine/byte_order.h>
-#define bswap_32(x) OSSwapInt32(x)
-#define bswap_64(x) OSSwapInt64(x)
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>
-#define bswap_32(x) bswap32(x)
-#define bswap_64(x) bswap64(x)
 #else
 #include <machine/endian.h>
-#define bswap_32(x) swap32(x)
-#define bswap_64(x) swap64(x)
 #endif
 
 #ifndef __BYTE_ORDER
@@ -100,28 +97,41 @@ void clock_gettime(int type, struct timespec *tv);
 #define __LITTLE_ENDIAN LITTLE_ENDIAN
 #endif
 
+#define __constant_swap16(x) ((uint16_t)(                              \
+       (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) |                    \
+       (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
+
+#define __constant_swap32(x) ((uint32_t)(                              \
+       (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |              \
+       (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |              \
+       (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |              \
+       (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
+
+#define __constant_swap64(x) ((uint64_t)(                              \
+       (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) |     \
+       (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) |     \
+       (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) |     \
+       (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) |     \
+       (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) |     \
+       (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) |     \
+       (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) |     \
+       (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
+
+
 static inline uint16_t __u_bswap16(uint16_t val)
 {
        return ((val >> 8) & 0xffu) | ((val & 0xffu) << 8);
 }
 
-#if _GNUC_MIN_VER(4, 2)
-#define __u_bswap32(x) __builtin_bswap32(x)
-#define __u_bswap64(x) __builtin_bswap64(x)
-#else
-#define __u_bswap32(x) bswap_32(x)
-#define __u_bswap64(x) bswap_64(x)
-#endif
-
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 
-#define cpu_to_be64(x) __u_bswap64(x)
-#define cpu_to_be32(x) __u_bswap32(x)
-#define cpu_to_be16(x) __u_bswap16((uint16_t) (x))
+#define cpu_to_be64(x) __constant_swap64(x)
+#define cpu_to_be32(x) __constant_swap32(x)
+#define cpu_to_be16(x) __constant_swap16(x)
 
-#define be64_to_cpu(x) __u_bswap64(x)
-#define be32_to_cpu(x) __u_bswap32(x)
-#define be16_to_cpu(x) __u_bswap16((uint16_t) (x))
+#define be64_to_cpu(x) __constant_swap64(x)
+#define be32_to_cpu(x) __constant_swap32(x)
+#define be16_to_cpu(x) __constant_swap16(x)
 
 #define cpu_to_le64(x) (x)
 #define cpu_to_le32(x) (x)
@@ -133,13 +143,13 @@ static inline uint16_t __u_bswap16(uint16_t val)
 
 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
 
-#define cpu_to_le64(x) __u_bswap64(x)
-#define cpu_to_le32(x) __u_bswap32(x)
-#define cpu_to_le16(x) __u_bswap16((uint16_t) (x))
+#define cpu_to_le64(x) __constant_swap64(x)
+#define cpu_to_le32(x) __constant_swap32(x)
+#define cpu_to_le16(x) __constant_swap16(x)
 
-#define le64_to_cpu(x) __u_bswap64(x)
-#define le32_to_cpu(x) __u_bswap32(x)
-#define le16_to_cpu(x) __u_bswap16((uint16_t) (x))
+#define le64_to_cpu(x) __constant_swap64(x)
+#define le32_to_cpu(x) __constant_swap32(x)
+#define le16_to_cpu(x) __constant_swap16(x)
 
 #define cpu_to_be64(x) (x)
 #define cpu_to_be32(x) (x)
@@ -159,24 +169,39 @@ static inline uint16_t __u_bswap16(uint16_t val)
 #define __constructor __attribute__((constructor))
 #endif
 
+#ifndef __destructor
+#define __destructor __attribute__((destructor))
+#endif
+
 #ifndef __hidden
 #define __hidden __attribute__((visibility("hidden")))
 #endif
 
-#ifndef BITS_PER_LONG
-#define BITS_PER_LONG (8 * sizeof(unsigned long))
-#endif
+int b64_encode(const void *src, size_t src_len,
+              void *dest, size_t dest_len);
+
+int b64_decode(const void *src, void *dest, size_t dest_len);
 
-#define BITFIELD_SIZE(_n) (((_n) + (BITS_PER_LONG - 1)) / BITS_PER_LONG)
+#define B64_ENCODE_LEN(_len)   ((((_len) + 2) / 3) * 4 + 1)
+#define B64_DECODE_LEN(_len)   (((_len) / 4) * 3 + 1)
 
-static inline void bitfield_set(unsigned long *bits, int bit)
+static inline unsigned int cbuf_order(unsigned int x)
 {
-       bits[bit / BITS_PER_LONG] |= (1UL << (bit % BITS_PER_LONG));
+       return 32 - __builtin_clz(x - 1);
 }
 
-static inline bool bitfield_test(unsigned long *bits, int bit)
+static inline unsigned long cbuf_size(int order)
 {
-       return !!(bits[bit / BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG)));
+       unsigned long page_size = sysconf(_SC_PAGESIZE);
+       unsigned long ret = 1ULL << order;
+
+       if (ret < page_size)
+               ret = page_size;
+
+       return ret;
 }
 
+void *cbuf_alloc(unsigned int order);
+void cbuf_free(void *ptr, unsigned int order);
+
 #endif