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Sourcecode: vdr-plugin-freecell version File versions  Download package

shared.c

#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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