Initial import of libucore

src/ucore_buffer.c

@@ -0,0 +1,77 @@
+#include <stdlib.h>
+#include <string.h>
+#include "ucore_buffer.h"
+ 
+GBuf*
+uc_new_gbuf(size_t initsz)
+{	
+	GBuf *p;
+	p = malloc(sizeof *p);
+	if(p == NULL)
+		return NULL;
+
+	p->used = 0;
+	p->len = initsz;
+	p->buf = NULL;
+    p->ref_cnt = 1;
+
+	if(initsz != 0 && (p->buf = malloc(initsz)) == NULL) {
+		free(p);
+		return NULL;
+	} 
+	
+	return p;
+}
+
+void
+uc_gbuf_ref(GBuf *buf)
+{
+    buf->ref_cnt++;
+}
+
+void
+uc_gbuf_unref(GBuf *buf)
+{
+    buf->ref_cnt--;
+
+    if(buf->ref_cnt == 0) {
+        free(buf->buf);
+        free(buf);
+    }
+}
+
+int 
+uc_gbuf_append(GBuf *buf,void *data,size_t len)
+{
+	unsigned char *d = data;
+	unsigned char *gbuf;
+	
+	if(buf->len - buf->used < len)
+		if(uc_grow_gbuf(buf, len + len/2))
+			return -1;
+
+	gbuf = buf->buf;
+	memcpy(gbuf + buf->used,d,len);
+	buf->used += len;
+	
+	return 0;	
+}
+
+int
+uc_grow_gbuf(GBuf *buf, size_t addlen)
+{
+	void *tmp;
+	size_t newsz;
+
+	newsz = buf->len + addlen;
+
+	tmp = realloc(buf->buf,newsz);
+	if(tmp == NULL)
+		return -1;
+
+	buf->buf = tmp;
+	buf->len = newsz;
+
+	return 0;
+}
+