80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
// =================================================================================
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// Internet Character Set Conversion: Base Class
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// =================================================================================
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#include "pch.hxx"
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#include "ConvBase.h"
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CINetCodeConverter::CINetCodeConverter()
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{
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nNumOverflowBytes = 0;
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}
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HRESULT CINetCodeConverter::GetStringSizeA(BYTE const* pbySource, long lSourceSize, long* plDestSize)
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{
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fOutputMode = FALSE;
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return WalkString(pbySource, lSourceSize, plDestSize);
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}
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HRESULT CINetCodeConverter::ConvertStringA(BYTE const* pbySource, long lSourceSize, BYTE* pbyDest, long lDestSize, long* lConvertedSize)
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{
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HRESULT hr;
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fOutputMode = TRUE;
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pbyOutput = pbyDest;
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lOutputLimit = lDestSize;
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// Output those bytes which could not be output at previous time.
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if (FAILED(hr = OutputOverflowBuffer()))
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return hr;
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return WalkString(pbySource, lSourceSize, lConvertedSize);
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}
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HRESULT CINetCodeConverter::WalkString(BYTE const* pbySource, long lSourceSize, long* lConvertedSize)
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{
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HRESULT hr = S_OK;
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lNumOutputBytes = 0;
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if (pbySource) {
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while (lSourceSize-- > 0) {
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if (FAILED(hr = ConvertByte(*pbySource++)))
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break;
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}
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} else {
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hr = CleanUp();
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}
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if (lConvertedSize)
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*lConvertedSize = lNumOutputBytes;
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return hr;
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}
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HRESULT CINetCodeConverter::EndOfDest(BYTE by)
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{
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if (nNumOverflowBytes < MAXOVERFLOWBYTES)
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OverflowBuffer[nNumOverflowBytes++] = by;
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return E_FAIL;
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}
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HRESULT CINetCodeConverter::OutputOverflowBuffer()
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{
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for (int n = 0; n < nNumOverflowBytes; n++) {
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if (lNumOutputBytes < lOutputLimit) {
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*pbyOutput++ = OverflowBuffer[n];
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lNumOutputBytes++;
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} else {
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// Overflow again
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for (int n2 = 0; n < nNumOverflowBytes; n++, n2++)
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OverflowBuffer[n2] = OverflowBuffer[n];
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nNumOverflowBytes = n2;
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return E_FAIL;
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}
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}
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return S_OK;
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}
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