From patchwork Mon Jan 18 10:56:30 2010
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Subject: [PATCHv2,1/3] bwap: add qemu_bswap helper
Date: Mon, 18 Jan 2010 00:56:30 -0000
From: "Michael S. Tsirkin" <mst@redhat.com>
X-Patchwork-Id: 43056
Message-Id: <20100118105630.GB8277@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org, agraf@suse.de, Blue Swirl <blauwirbel@gmail.com>, 
 Isaku Yamahata <yamahata@valinux.co.jp>, paul@codesourcery.com,
 Aurelien Jarno <aurelien@aurel32.net>

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(-)

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 */