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#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;
}
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