91 lines
1.5 KiB
C
91 lines
1.5 KiB
C
#include "tools/shared.h"
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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cSharedData *cSharedData::Construct (size_t Length) {
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size_t reallength = sizeof(cSharedData) + Length;
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cSharedData *ret = (cSharedData*)new char[reallength];
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ret->m_Length = Length;
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ret->m_NumRefs = 0;
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return ret;
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}
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cTBShared::cTBShared(void) {
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m_Buffer = NULL;
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}
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cTBShared::cTBShared (const cTBShared &src) {
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m_Buffer = src.m_Buffer;
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if (m_Buffer)
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++*m_Buffer;
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}
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cTBShared::~cTBShared () {
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if (m_Buffer)
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Release();
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}
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void cTBShared::Clear () {
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if (m_Buffer)
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Release();
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m_Buffer = 0;
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}
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void cTBShared::Set (const cTBShared &src) {
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if (m_Buffer)
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Release();
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m_Buffer = src.m_Buffer;
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if (m_Buffer)
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++*m_Buffer;
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}
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void cTBShared::Release () {
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CHECK_PTR(m_Buffer);
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if (--*m_Buffer == 0)
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delete[] (char*)m_Buffer;
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m_Buffer = 0;
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}
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void cTBShared::Release(uint newsize) {
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CHECK_PTR(m_Buffer);
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Allocate(newsize, true);
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}
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void cTBShared::Exclusive () {
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CHECK_PTR(m_Buffer);
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if (m_Buffer->Refs() == 1)
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return;
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cSharedData *copy = cSharedData::Construct(m_Buffer->Size());
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memcpy(*copy, *m_Buffer, m_Buffer->Size());
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Release();
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m_Buffer = copy;
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++*m_Buffer;
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}
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void cTBShared::Allocate (size_t len, bool keep /* = false */) {
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if (m_Buffer && (m_Buffer->Refs() == 1) && (m_Buffer->Size() == len))
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return;
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cSharedData *newBuffer = cSharedData::Construct(len);
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if (m_Buffer) {
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if (keep)
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memcpy(*newBuffer, *m_Buffer, len < m_Buffer->Size() ? len : m_Buffer->Size());
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Release();
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}
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m_Buffer = newBuffer;
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++*m_Buffer;
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}
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