From: Gerhard Sittig <redacted>
Date: Mon, 26 Oct 2020 18:48:22 +0000 (+0100)
Subject: libsigrok-internal.h: add u64be endianess writer
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=efce57da322cbe3d8c65332122ab3fb76e02089a;p=libsigrok.git

libsigrok-internal.h: add u64be endianess writer

Add endianess aware writer for uint64_t data in BE format. This is
motivated by the Codethink Interrogizer.
---

diff --git a/src/libsigrok-internal.h b/src/libsigrok-internal.h
index 9a672c7d..98d1631e 100644
--- a/src/libsigrok-internal.h
+++ b/src/libsigrok-internal.h
@@ -475,6 +475,23 @@ static inline void write_u32le(uint8_t *p, uint32_t x)
 }
 #define WL32(p, x) write_u32le((uint8_t *)(p), (uint32_t)(x))
 
+/**
+ * Write a 64 bits unsigned integer to memory stored as big endian.
+ * @param p a pointer to the output memory
+ * @param x the input unsigned integer
+ */
+static inline void write_u64be(uint8_t *p, uint64_t x)
+{
+	p[7] = x & 0xff; x >>= 8;
+	p[6] = x & 0xff; x >>= 8;
+	p[5] = x & 0xff; x >>= 8;
+	p[4] = x & 0xff; x >>= 8;
+	p[3] = x & 0xff; x >>= 8;
+	p[2] = x & 0xff; x >>= 8;
+	p[1] = x & 0xff; x >>= 8;
+	p[0] = x & 0xff; x >>= 8;
+}
+
 /**
  * Write a 64 bits unsigned integer to memory stored as little endian.
  * @param p a pointer to the output memory