File indexing completed on 2024-11-24 04:31:15

 /*
     SPDX-FileCopyrightText: 2008 Joris Guisson <joris.guisson@gmail.com>
     SPDX-FileCopyrightText: 2008 Ivan Vasic <ivasic@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "piecedata.h"
 #include <klocalizedstring.h>
 #include <util/log.h>
 #ifndef Q_WS_WIN
 #include <util/signalcatcher.h>
 #endif
 #include "chunk.h"
 #include <util/error.h>
 #include <util/file.h>
 #include <util/sha1hashgen.h>
 
 namespace bt
 {
 PieceData::PieceData(bt::Chunk *chunk, bt::Uint32 off, bt::Uint32 len, bt::Uint8 *ptr, bt::CacheFile::Ptr cache_file, bool read_only)
     : chunk(chunk)
     , off(off)
     , len(len)
     , ptr(ptr)
     , cache_file(cache_file)
     , read_only(read_only)
 {
 }
 
 PieceData::~PieceData()
 {
     unload();
 }
 
 void PieceData::unload()
 {
     if (!ptr)
         return;
 
     if (!mapped())
         delete[] ptr;
     else
         cache_file->unmap(ptr, len);
     ptr = nullptr;
 }
 
 Uint32 PieceData::write(const bt::Uint8 *buf, Uint32 buf_size, Uint32 off)
 {
     if (off + buf_size > len || !ptr)
         return 0;
 
     if (read_only)
         throw bt::Error(i18n("Unable to write to a piece mapped read only"));
 
 #ifndef Q_WS_WIN
     BUS_ERROR_WPROTECT();
 #endif
     memcpy(ptr + off, buf, buf_size);
     return buf_size;
 }
 
 Uint32 PieceData::read(Uint8 *buf, Uint32 to_read, Uint32 off)
 {
     if (off + to_read > len || !ptr)
         return 0;
 
 #ifndef Q_WS_WIN
     BUS_ERROR_RPROTECT();
 #endif
     memcpy(buf, ptr + off, to_read);
     return to_read;
 }
 
 Uint32 PieceData::writeToFile(File &file, Uint32 size, Uint32 off)
 {
     if (off + size > len || !ptr)
         return 0;
 
 #ifndef Q_WS_WIN
     BUS_ERROR_RPROTECT();
 #endif
     return file.write(ptr + off, size);
 }
 
 Uint32 PieceData::readFromFile(File &file, Uint32 size, Uint32 off)
 {
     if (off + size > len || !ptr)
         return 0;
 
     if (read_only)
         throw bt::Error(i18n("Unable to write to a piece mapped read only"));
 
 #ifndef Q_WS_WIN
     BUS_ERROR_WPROTECT();
 #endif
     return file.read(ptr + off, size);
 }
 
 void PieceData::updateHash(SHA1HashGen &hg)
 {
     if (!ptr)
         return;
 
 #ifndef Q_WS_WIN
     BUS_ERROR_RPROTECT();
 #endif
     hg.update(ptr, len);
 }
 
 SHA1Hash PieceData::generateHash() const
 {
     if (!ptr)
         return SHA1Hash();
 
 #ifndef Q_WS_WIN
     BUS_ERROR_RPROTECT();
 #endif
     return SHA1Hash::generate(ptr, len);
 }
 
 void PieceData::unmapped()
 {
     ptr = nullptr;
 }
 }