Beginning task manager

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/Buffer.cc b/lib/Buffer.cc
new file mode 100644
index 0000000..164c961
--- /dev/null
+++ b/lib/Buffer.cc
@@ -0,0 +1,55 @@
+#include <string.h>
+#include "Buffer.h"
+#include "General.h"
+#include "config.h"
+
+Buffer::Buffer() : Handle(-1), buffer(NULL), realsiz(0), bufsiz(0), ptr(0) { }
+
+Buffer::~Buffer() {
+    free(buffer);
+}
+
+ssize_t Buffer::write(const void *buf, size_t count) {
+    if (count + realsiz > bufsiz) {
+	int numblocks = (count + realsiz) / realloc_threshold;
+	int remains = (count + realsiz) % realloc_threshold;
+	buffer = (char *) realloc(buffer, bufsiz = ((numblocks + (remains ? 1 : 0)) * realloc_threshold));
+    }
+    memcpy(buffer + realsiz, buf, count);
+    realsiz += count;
+    
+    return count;
+}
+
+ssize_t Buffer::read(void *buf, size_t count) {
+    count = MIN(count, realsiz - ptr);
+    
+    if (!count) {
+	return 0;
+    }
+
+    memcpy(buf, buffer + ptr, count);
+    ptr += count;
+    
+    if (ptr >= realloc_threshold) {
+	int numblocks = (ptr / realloc_threshold) - (bufsiz / realloc_threshold);
+	memmove(buffer, buffer + numblocks * realloc_threshold, numblocks * realloc_threshold);
+	buffer = (char *) realloc(buffer, bufsiz = (numblocks * realloc_threshold));
+	ptr -= numblocks * realloc_threshold;
+	realsiz -= numblocks * realloc_threshold;
+    }
+    
+    return count;
+}
+
+bool Buffer::CanRead() {
+    return true;
+}
+
+bool Buffer::CanWrite() {
+    return true;
+}
+
+String Buffer::GetName() {
+    return "Buffer";
+}