Patchwork [PATCHv2,1/3] bwap: add qemu_bswap helper

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Submitter Michael S. Tsirkin
Date Jan. 18, 2010, 10:56 a.m.
Message ID <20100118105630.GB8277@redhat.com>
Download mbox | patch
Permalink /patch/43056/
State New
Headers show

Comments

Michael S. Tsirkin - Jan. 18, 2010, 10:56 a.m.
add helper that can swap values of 4, 2, 1 bytes

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 bswap.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

Patch

diff --git a/bswap.h b/bswap.h
index 4558704..aace9b7 100644
--- a/bswap.h
+++ b/bswap.h
@@ -214,4 +214,10 @@  static inline void cpu_to_be32wu(uint32_t *p, uint32_t v)
 #undef le_bswaps
 #undef be_bswaps
 
+/* len must be one of 1, 2, 4 */
+static inline uint32_t qemu_bswap_len(uint32_t value, int len)
+{
+    return bswap32(value) >> (32 - 8 * len);
+}
+
 #endif /* BSWAP_H */