Merge commit 'upstream/0.3'

[pysam.git] / tabix / bam_endian.h

diff --git a/tabix/bam_endian.h b/tabix/bam_endian.h
new file mode 100644 (file)
index 0000000..0fc74a8
--- /dev/null
+++ b/tabix/bam_endian.h
@@ -0,0 +1,42 @@
+#ifndef BAM_ENDIAN_H
+#define BAM_ENDIAN_H
+
+#include <stdint.h>
+
+static inline int bam_is_big_endian()
+{
+       long one= 1;
+       return !(*((char *)(&one)));
+}
+static inline uint16_t bam_swap_endian_2(uint16_t v)
+{
+       return (uint16_t)(((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8));
+}
+static inline void *bam_swap_endian_2p(void *x)
+{
+       *(uint16_t*)x = bam_swap_endian_2(*(uint16_t*)x);
+       return x;
+}
+static inline uint32_t bam_swap_endian_4(uint32_t v)
+{
+       v = ((v & 0x0000FFFFU) << 16) | (v >> 16);
+       return ((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8);
+}
+static inline void *bam_swap_endian_4p(void *x)
+{
+       *(uint32_t*)x = bam_swap_endian_4(*(uint32_t*)x);
+       return x;
+}
+static inline uint64_t bam_swap_endian_8(uint64_t v)
+{
+       v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
+       v = ((v & 0x0000FFFF0000FFFFLLU) << 16) | ((v & 0xFFFF0000FFFF0000LLU) >> 16);
+       return ((v & 0x00FF00FF00FF00FFLLU) << 8) | ((v & 0xFF00FF00FF00FF00LLU) >> 8);
+}
+static inline void *bam_swap_endian_8p(void *x)
+{
+       *(uint64_t*)x = bam_swap_endian_8(*(uint64_t*)x);
+       return x;
+}
+
+#endif