mirror of https://github.com/PCSX2/pcsx2.git
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2014 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "PrecompiledHeader.h"
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#include "ChunksCache.h"
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void ChunksCache::SetLimit(uint megabytes)
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{
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m_limit = (s64)megabytes * 1024 * 1024;
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MatchLimit();
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}
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void ChunksCache::MatchLimit(bool removeAll)
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{
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std::list<CacheEntry*>::reverse_iterator rit;
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while (!m_entries.empty() && (removeAll || m_size > m_limit))
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{
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rit = m_entries.rbegin();
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m_size -= (*rit)->size;
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delete (*rit);
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m_entries.pop_back();
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}
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}
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void ChunksCache::Take(void* pMallocedSrc, s64 offset, int length, int coverage)
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{
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m_entries.push_front(new CacheEntry(pMallocedSrc, offset, length, coverage));
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m_size += length;
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MatchLimit();
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}
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// By design, succeed only if the entire request is in a single cached chunk
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int ChunksCache::Read(void* pDest, s64 offset, int length)
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{
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for (auto it = m_entries.begin(); it != m_entries.end(); it++)
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{
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CacheEntry* e = *it;
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if (e && offset >= e->offset && (offset + length) <= (e->offset + e->coverage))
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{
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if (it != m_entries.begin())
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m_entries.splice(m_entries.begin(), m_entries, it); // Move to top (MRU)
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return CopyAvailable(e->data, e->offset, e->size, pDest, offset, length);
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}
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}
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return -1;
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}
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