[libvirt] [PATCH v2 05/15] util: Introduce virReadBufInt16LE and virReadBufInt16BE
In order to read 16 bits of data in the native format and convert add
the 16 bit macros to match existing 32 and 64 bit code.
Signed-off-by: John Ferlan <jferlan(a)redhat.com>
---
src/util/virendian.h | 24 ++++++++++++++++++++++++
tests/virendiantest.c | 18 ++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/src/util/virendian.h b/src/util/virendian.h
index eefe48c..97940bd 100644
--- a/src/util/virendian.h
+++ b/src/util/virendian.h
@@ -90,4 +90,28 @@
((uint32_t)(uint8_t)((buf)[2]) << 16) | \
((uint32_t)(uint8_t)((buf)[3]) << 24))
+/**
+ * virReadBufInt16BE:
+ * @buf: byte to start reading at (can be 'char*' or 'unsigned char*');
+ * evaluating buf must not have any side effects
+ *
+ * Read 2 bytes at BUF as a big-endian 16-bit number. Caller is
+ * responsible to avoid reading beyond array bounds.
+ */
+# define virReadBufInt16BE(buf) \
+ (((uint16_t)(uint8_t)((buf)[0]) << 8) | \
+ (uint16_t)(uint8_t)((buf)[1]))
+
+/**
+ * virReadBufInt16LE:
+ * @buf: byte to start reading at (can be 'char*' or 'unsigned char*');
+ * evaluating buf must not have any side effects
+ *
+ * Read 2 bytes at BUF as a little-endian 16-bit number. Caller is
+ * responsible to avoid reading beyond array bounds.
+ */
+# define virReadBufInt16LE(buf) \
+ ((uint16_t)(uint8_t)((buf)[0]) | \
+ ((uint16_t)(uint8_t)((buf)[1]) << 8))
+
#endif /* __VIR_ENDIAN_H__ */
diff --git a/tests/virendiantest.c b/tests/virendiantest.c
index 4072507..f858e5c 100644
--- a/tests/virendiantest.c
+++ b/tests/virendiantest.c
@@ -50,6 +50,15 @@ test1(const void *data ATTRIBUTE_UNUSED)
if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
goto cleanup;
+ if (virReadBufInt16BE(array) != 0x0102U)
+ goto cleanup;
+ if (virReadBufInt16BE(array + 11) != 0x8c8dU)
+ goto cleanup;
+ if (virReadBufInt16LE(array) != 0x0201U)
+ goto cleanup;
+ if (virReadBufInt16LE(array + 11) != 0x8d8cU)
+ goto cleanup;
+
ret = 0;
cleanup:
return ret;
@@ -81,6 +90,15 @@ test2(const void *data ATTRIBUTE_UNUSED)
if (virReadBufInt32LE(array + 9) != 0x8d8c8b8aU)
goto cleanup;
+ if (virReadBufInt16BE(array) != 0x0102U)
+ goto cleanup;
+ if (virReadBufInt16BE(array + 11) != 0x8c8dU)
+ goto cleanup;
+ if (virReadBufInt16LE(array) != 0x0201U)
+ goto cleanup;
+ if (virReadBufInt16LE(array + 11) != 0x8d8cU)
+ goto cleanup;
+
ret = 0;
cleanup:
return ret;
--
2.5.5