[PATCH 2/6] LZ4: Implement ntohl to remove dependency on arpa/inet.h

[Javier Celaya <javier.celaya@xxxxxxxxx>]

---
 common/canvas_base.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/common/canvas_base.c b/common/canvas_base.c
index cfbba5e..0f6b7f4 100644
--- a/common/canvas_base.c
+++ b/common/canvas_base.c
@@ -27,7 +27,6 @@
 #include <math.h>
 
 #ifdef USE_LZ4
-#include <arpa/inet.h>
 #include <lz4.h>
 #endif
 #include <spice/macros.h>
@@ -548,6 +547,18 @@ static pixman_image_t *canvas_get_jpeg(CanvasBase *canvas, SpiceImage *image, in
 }
 
 #ifdef USE_LZ4
+static inline uint32_t lz4_decode32(uint8_t *buffer)
+{
+    // Network order -> big endian
+    uint32_t value = 0;
+    int i;
+    for (i = 0; i < 4; ++i) {
+        value <<= 8;
+        value += buffer[i];
+    }
+    return value;
+}
+
 static pixman_image_t *canvas_get_lz4(CanvasBase *canvas, SpiceImage *image, int invers)
 {
     pixman_image_t *surface = NULL;
@@ -587,7 +598,7 @@ static pixman_image_t *canvas_get_lz4(CanvasBase *canvas, SpiceImage *image, int
 
     do {
         // Read next compressed block
-        enc_size = ntohl(*((uint32_t *)data));
+        enc_size = lz4_decode32(data);
         data += 4;
         dec_size = LZ4_decompress_safe_continue(stream, (const char *) data,
                                                 (char *) dest, enc_size, available);
-- 
1.9.3

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