Proxy prefetch cache becomes a command-line argument.

src/proxy/prefetch.h

@@ -1,14 +1,33 @@
 #ifndef PREFETCH_H
 #define PREFETCH_H
 
+#include <stdint.h>
+#include <stddef.h>
+
 #define PREFETCH_BUFSIZE 4096
 
 struct prefetch {
+	/* True if there is data in the buffer. */
         int is_full;
-        __be64 from;
-        __be32 len;
+	/* The start point of the current content of buffer */
+        uint64_t from;
+	/* The length of the current content of buffer */
+        uint32_t len;
 
-        char buffer[PREFETCH_BUFSIZE];
+	/* The total size of the buffer, in bytes. */
+	size_t size;
+
+        char *buffer;
 };
 
+struct prefetch* prefetch_create( size_t size_bytes );
+void prefetch_destroy( struct prefetch *prefetch );
+size_t prefetch_size( struct prefetch *);
+void prefetch_set_is_empty( struct prefetch *prefetch );
+void prefetch_set_is_full( struct prefetch *prefetch );
+void prefetch_set_full( struct prefetch *prefetch, int val );
+int prefetch_is_full( struct prefetch *prefetch );
+int prefetch_contains( struct prefetch *prefetch, uint64_t from, uint32_t len );
+char *prefetch_offset( struct prefetch *prefetch, uint64_t from );
+
 #endif