1 files changed, 90 insertions, 0 deletions
diff --git a/tools/shared.c b/tools/shared.c
new file mode 100644
index 0000000..ef20969
--- /dev/null
+++ b/tools/shared.c
@@ -0,0 +1,90 @@
+#include "tools/shared.h"
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+
+cSharedData *cSharedData::Construct (size_t Length) {
+	size_t reallength = sizeof(cSharedData) + Length;
+	cSharedData *ret = (cSharedData*)new char[reallength];
+
+	ret->m_Length = Length;
+	ret->m_NumRefs = 0;
+	return ret;
+}
+
+cTBShared::cTBShared(void) {
+	m_Buffer = NULL;
+}
+
+cTBShared::cTBShared (const cTBShared &src) {
+	m_Buffer = src.m_Buffer;
+	if (m_Buffer)
+		++*m_Buffer;
+}
+
+cTBShared::~cTBShared () {
+	if (m_Buffer)
+		Release();
+}
+
+void cTBShared::Clear () {
+	if (m_Buffer)
+		Release();
+	m_Buffer = 0;
+}
+
+void cTBShared::Set (const cTBShared &src) {
+	if (m_Buffer)
+		Release();
+
+	m_Buffer = src.m_Buffer;
+	if (m_Buffer)
+		++*m_Buffer;
+}
+
+void cTBShared::Release () {
+	CHECK_PTR(m_Buffer);
+
+	if (--*m_Buffer == 0)
+		delete[] (char*)m_Buffer;
+
+	m_Buffer = 0;
+}
+
+void cTBShared::Release(uint newsize) {
+	CHECK_PTR(m_Buffer);
+
+	Allocate(newsize, true);
+}
+
+void cTBShared::Exclusive () {
+	CHECK_PTR(m_Buffer);
+
+	if (m_Buffer->Refs() == 1)
+		return;
+
+	cSharedData *copy = cSharedData::Construct(m_Buffer->Size());
+	memcpy(*copy, *m_Buffer, m_Buffer->Size());
+
+	Release();
+
+	m_Buffer = copy;
+	++*m_Buffer;
+}
+
+void cTBShared::Allocate (size_t len, bool keep /* = false */) {
+	if (m_Buffer && (m_Buffer->Refs() == 1) && (m_Buffer->Size() == len))
+		return;
+
+	cSharedData *newBuffer = cSharedData::Construct(len);
+	if (m_Buffer) {
+		if (keep)
+			memcpy(*newBuffer, *m_Buffer, len < m_Buffer->Size() ? len : m_Buffer->Size());
+
+		Release();
+	}
+	m_Buffer = newBuffer;
+	++*m_Buffer;
+}
+