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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <package/InflateZstd.hxx>
#include <string.h>
using namespace com::sun::star::uno;
using namespace ZipUtils;
InflateZstd::InflateZstd(bool)
: bFinished(false)
, nLastInflateError(0)
, pDCtx(ZSTD_createDCtx())
, bStreamInitialized(false)
{
if (!pDCtx)
{
nLastInflateError = static_cast<sal_Int32>(ZSTD_error_memory_allocation);
}
inBuffer = { nullptr, 0, 0 };
}
InflateZstd::~InflateZstd() { end(); }
void InflateZstd::setInput(const Sequence<sal_Int8>& rBuffer)
{
if (!pDCtx)
{
bStreamInitialized = false;
return;
}
sInBuffer = rBuffer;
inBuffer.src = sInBuffer.getConstArray();
inBuffer.size = sInBuffer.getLength();
inBuffer.pos = 0;
bStreamInitialized = true;
}
sal_Int32 InflateZstd::doInflateSegment(Sequence<sal_Int8>& rBuffer, sal_Int32 nNewOffset,
sal_Int32 nNewLength)
{
if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
return 0;
return doInflateBytes(rBuffer, nNewOffset, nNewLength);
}
void InflateZstd::end()
{
if (pDCtx)
{
ZSTD_freeDCtx(pDCtx);
pDCtx = nullptr;
}
bStreamInitialized = false;
inBuffer = { nullptr, 0, 0 };
}
sal_Int32 InflateZstd::doInflateBytes(Sequence<sal_Int8>& rBuffer, sal_Int32 nNewOffset,
sal_Int32 nNewLength)
{
if (bFinished)
{
return 0;
}
if (!pDCtx || !bStreamInitialized)
{
nLastInflateError = 1;
return 0;
}
nLastInflateError = 0;
ZSTD_outBuffer outBuffer
= { rBuffer.getArray() + nNewOffset, static_cast<size_t>(nNewLength), 0 };
size_t ret = ZSTD_decompressStream(pDCtx, &outBuffer, &inBuffer);
if (ZSTD_isError(ret))
{
nLastInflateError = static_cast<sal_Int32>(ret);
ZSTD_DCtx_reset(pDCtx, ZSTD_reset_session_only);
return 0;
}
if (ret == 0)
bFinished = true;
return static_cast<sal_Int32>(outBuffer.pos);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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