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/*************************************************************************** |
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* * |
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* libgig - C++ cross-platform Gigasampler format file loader library * |
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* * |
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* Copyright (C) 2003-2005 by Christian Schoenebeck * |
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* <cuse@users.sourceforge.net> * |
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* * |
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* This library is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This library is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* 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 * |
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* along with this library; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#include <string.h> |
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|
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#include "RIFF.h" |
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|
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#include "helper.h" |
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|
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namespace RIFF { |
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|
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// *************** Chunk ************** |
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// * |
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|
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Chunk::Chunk(File* pFile) { |
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#if DEBUG |
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std::cout << "Chunk::Chunk(File* pFile)" << std::endl; |
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#endif // DEBUG |
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ulPos = 0; |
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pParent = NULL; |
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pChunkData = NULL; |
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ulChunkDataSize = 0; |
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ChunkID = CHUNK_ID_RIFF; |
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this->pFile = pFile; |
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} |
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|
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Chunk::Chunk(File* pFile, unsigned long StartPos, List* Parent) { |
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#if DEBUG |
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std::cout << "Chunk::Chunk(File*,ulong,bool,List*),StartPos=" << StartPos << std::endl; |
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#endif // DEBUG |
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this->pFile = pFile; |
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ulStartPos = StartPos + CHUNK_HEADER_SIZE; |
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pParent = Parent; |
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ulPos = 0; |
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pChunkData = NULL; |
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ulChunkDataSize = 0; |
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ReadHeader(StartPos); |
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} |
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|
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Chunk::Chunk(File* pFile, List* pParent, uint32_t uiChunkID, uint uiBodySize) { |
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this->pFile = pFile; |
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ulStartPos = 0; // arbitrary usually, since it will be updated when we write the chunk |
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this->pParent = pParent; |
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ulPos = 0; |
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pChunkData = NULL; |
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ulChunkDataSize = 0; |
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ChunkID = uiChunkID; |
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CurrentChunkSize = 0; |
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NewChunkSize = uiBodySize; |
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} |
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|
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Chunk::~Chunk() { |
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if (pChunkData) delete[] pChunkData; |
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} |
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|
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void Chunk::ReadHeader(unsigned long fPos) { |
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#if DEBUG |
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std::cout << "Chunk::Readheader(" << fPos << ") "; |
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#endif // DEBUG |
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#if POSIX |
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if (lseek(pFile->hFileRead, fPos, SEEK_SET) != -1) { |
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read(pFile->hFileRead, &ChunkID, 4); |
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read(pFile->hFileRead, &CurrentChunkSize, 4); |
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#else |
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if (!fseek(pFile->hFileRead, fPos, SEEK_SET)) { |
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fread(&ChunkID, 4, 1, pFile->hFileRead); |
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fread(&CurrentChunkSize, 4, 1, pFile->hFileRead); |
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#endif // POSIX |
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#if WORDS_BIGENDIAN |
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if (ChunkID == CHUNK_ID_RIFF) { |
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pFile->bEndianNative = false; |
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} |
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#else // little endian |
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if (ChunkID == CHUNK_ID_RIFX) { |
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pFile->bEndianNative = false; |
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ChunkID = CHUNK_ID_RIFF; |
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} |
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#endif // WORDS_BIGENDIAN |
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if (!pFile->bEndianNative) { |
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//swapBytes_32(&ChunkID); |
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swapBytes_32(&CurrentChunkSize); |
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} |
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#if DEBUG |
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std::cout << "ckID=" << convertToString(ChunkID) << " "; |
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std::cout << "ckSize=" << ChunkSize << " "; |
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std::cout << "bEndianNative=" << bEndianNative << std::endl; |
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#endif // DEBUG |
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NewChunkSize = CurrentChunkSize; |
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} |
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} |
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|
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void Chunk::WriteHeader(unsigned long fPos) { |
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uint32_t uiNewChunkID = ChunkID; |
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if (ChunkID == CHUNK_ID_RIFF) { |
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#if WORDS_BIGENDIAN |
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if (pFile->bEndianNative) uiNewChunkID = CHUNK_ID_RIFX; |
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#else // little endian |
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if (!pFile->bEndianNative) uiNewChunkID = CHUNK_ID_RIFX; |
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#endif // WORDS_BIGENDIAN |
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} |
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|
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uint32_t uiNewChunkSize = NewChunkSize; |
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if (!pFile->bEndianNative) { |
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swapBytes_32(&uiNewChunkSize); |
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} |
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|
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#if POSIX |
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if (lseek(pFile->hFileWrite, fPos, SEEK_SET) != -1) { |
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write(pFile->hFileWrite, &uiNewChunkID, 4); |
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write(pFile->hFileWrite, &uiNewChunkSize, 4); |
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} |
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#else |
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if (!fseek(pFile->hFileWrite, fPos, SEEK_SET)) { |
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fwrite(&uiNewChunkID, 4, 1, pFile->hFileWrite); |
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fwrite(&uiNewChunkSize, 4, 1, pFile->hFileWrite); |
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} |
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#endif // POSIX |
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} |
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|
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/** |
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* Returns the String representation of the chunk's ID (e.g. "RIFF", |
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* "LIST"). |
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*/ |
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String Chunk::GetChunkIDString() { |
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return convertToString(ChunkID); |
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} |
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|
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/** |
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* Sets the position within the chunk body, thus within the data portion |
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* of the chunk (in bytes). |
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* |
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* <b>Caution:</b> the position will be reset to zero whenever |
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* File::Save() was called. |
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* |
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* @param Where - position offset (in bytes) |
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* @param Whence - optional: defines to what <i>\a Where</i> relates to, |
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* if omitted \a Where relates to beginning of the chunk |
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* data |
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*/ |
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unsigned long Chunk::SetPos(unsigned long Where, stream_whence_t Whence) { |
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#if DEBUG |
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std::cout << "Chunk::SetPos(ulong)" << std::endl; |
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#endif // DEBUG |
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switch (Whence) { |
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case stream_curpos: |
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ulPos += Where; |
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break; |
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case stream_end: |
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ulPos = CurrentChunkSize - 1 - Where; |
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break; |
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case stream_backward: |
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ulPos -= Where; |
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break; |
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case stream_start: default: |
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ulPos = Where; |
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break; |
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} |
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if (ulPos > CurrentChunkSize) ulPos = CurrentChunkSize; |
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return ulPos; |
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} |
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|
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/** |
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* Returns the number of bytes left to read in the chunk body. |
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* When reading data from the chunk using the Read*() Methods, the |
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* position within the chunk data (that is the chunk body) will be |
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* incremented by the number of read bytes and RemainingBytes() returns |
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* how much data is left to read from the current position to the end |
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* of the chunk data. |
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* |
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* @returns number of bytes left to read |
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*/ |
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unsigned long Chunk::RemainingBytes() { |
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#if DEBUG |
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std::cout << "Chunk::Remainingbytes()=" << CurrentChunkSize - ulPos << std::endl; |
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#endif // DEBUG |
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return CurrentChunkSize - ulPos; |
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} |
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|
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/** |
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* Returns the current state of the chunk object. |
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* Following values are possible: |
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* - RIFF::stream_ready : |
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* chunk data can be read (this is the usual case) |
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* - RIFF::stream_closed : |
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* the data stream was closed somehow, no more reading possible |
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* - RIFF::stream_end_reached : |
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* alreaady reached the end of the chunk data, no more reading |
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* possible without SetPos() |
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*/ |
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stream_state_t Chunk::GetState() { |
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#if DEBUG |
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std::cout << "Chunk::GetState()" << std::endl; |
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#endif // DEBUG |
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#if POSIX |
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if (pFile->hFileRead == 0) return stream_closed; |
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#else |
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if (pFile->hFileRead == NULL) return stream_closed; |
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#endif // POSIX |
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if (ulPos < CurrentChunkSize) return stream_ready; |
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else return stream_end_reached; |
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} |
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|
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/** |
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* Reads \a WordCount number of data words with given \a WordSize and |
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* copies it into a buffer pointed by \a pData. The buffer has to be |
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* allocated and be sure to provide the correct \a WordSize, as this |
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* will be important and taken into account for eventual endian |
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* correction (swapping of bytes due to different native byte order of |
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* a system). The position within the chunk will automatically be |
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* incremented. |
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* |
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* @param pData destination buffer |
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* @param WordCount number of data words to read |
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* @param WordSize size of each data word to read |
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* @returns number of successfully read data words or 0 if end |
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* of file reached or error occured |
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*/ |
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unsigned long Chunk::Read(void* pData, unsigned long WordCount, unsigned long WordSize) { |
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#if DEBUG |
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std::cout << "Chunk::Read(void*,ulong,ulong)" << std::endl; |
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#endif // DEBUG |
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if (ulPos >= CurrentChunkSize) return 0; |
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if (ulPos + WordCount * WordSize >= CurrentChunkSize) WordCount = (CurrentChunkSize - ulPos) / WordSize; |
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#if POSIX |
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if (lseek(pFile->hFileRead, ulStartPos + ulPos, SEEK_SET) < 0) return 0; |
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unsigned long readWords = read(pFile->hFileRead, pData, WordCount * WordSize); |
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if (readWords < 1) return 0; |
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readWords /= WordSize; |
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#else // standard C functions |
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if (fseek(pFile->hFileRead, ulStartPos + ulPos, SEEK_SET)) return 0; |
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unsigned long readWords = fread(pData, WordSize, WordCount, pFile->hFileRead); |
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#endif // POSIX |
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if (!pFile->bEndianNative && WordSize != 1) { |
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switch (WordSize) { |
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case 2: |
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for (unsigned long iWord = 0; iWord < readWords; iWord++) |
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swapBytes_16((uint16_t*) pData + iWord); |
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break; |
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case 4: |
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for (unsigned long iWord = 0; iWord < readWords; iWord++) |
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swapBytes_32((uint32_t*) pData + iWord); |
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break; |
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default: |
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for (unsigned long iWord = 0; iWord < readWords; iWord++) |
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swapBytes((uint8_t*) pData + iWord * WordSize, WordSize); |
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break; |
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} |
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} |
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SetPos(readWords * WordSize, stream_curpos); |
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return readWords; |
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} |
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|
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/** |
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* Writes \a WordCount number of data words with given \a WordSize from |
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* the buffer pointed by \a pData. Be sure to provide the correct |
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* \a WordSize, as this will be important and taken into account for |
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* eventual endian correction (swapping of bytes due to different |
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* native byte order of a system). The position within the chunk will |
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* automatically be incremented. |
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* |
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* @param pData source buffer (containing the data) |
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* @param WordCount number of data words to write |
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* @param WordSize size of each data word to write |
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* @returns number of successfully written data words |
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* @throws RIFF::Exception if write operation would exceed current |
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* chunk size or any IO error occured |
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* @see Resize() |
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*/ |
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unsigned long Chunk::Write(void* pData, unsigned long WordCount, unsigned long WordSize) { |
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if (pFile->Mode != stream_mode_read_write) |
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throw Exception("Cannot write data to chunk, file has to be opened in read+write mode first"); |
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if (ulPos >= CurrentChunkSize || ulPos + WordCount * WordSize > CurrentChunkSize) |
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throw Exception("End of chunk reached while trying to write data"); |
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if (!pFile->bEndianNative && WordSize != 1) { |
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switch (WordSize) { |
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case 2: |
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for (unsigned long iWord = 0; iWord < WordCount; iWord++) |
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swapBytes_16((uint16_t*) pData + iWord); |
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break; |
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case 4: |
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for (unsigned long iWord = 0; iWord < WordCount; iWord++) |
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swapBytes_32((uint32_t*) pData + iWord); |
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break; |
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default: |
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for (unsigned long iWord = 0; iWord < WordCount; iWord++) |
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swapBytes((uint8_t*) pData + iWord * WordSize, WordSize); |
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break; |
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} |
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} |
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#if POSIX |
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if (lseek(pFile->hFileWrite, ulStartPos + ulPos, SEEK_SET) < 0) { |
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throw Exception("Could not seek to position " + ToString(ulPos) + |
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" in chunk (" + ToString(ulStartPos + ulPos) + " in file)"); |
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} |
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unsigned long writtenWords = write(pFile->hFileWrite, pData, WordCount * WordSize); |
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if (writtenWords < 1) throw Exception("POSIX IO Error while trying to write chunk data"); |
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writtenWords /= WordSize; |
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#else // standard C functions |
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if (fseek(pFile->hFileWrite, ulStartPos + ulPos, SEEK_SET)) { |
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throw Exception("Could not seek to position " + ToString(ulPos) + |
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" in chunk (" + ToString(ulStartPos + ulPos) + " in file)"); |
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} |
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unsigned long writtenWords = fwrite(pData, WordSize, WordCount, pFile->hFileWrite); |
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#endif // POSIX |
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SetPos(writtenWords * WordSize, stream_curpos); |
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return writtenWords; |
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} |
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|
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/** Just an internal wrapper for the main <i>Read()</i> method with additional Exception throwing on errors. */ |
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unsigned long Chunk::ReadSceptical(void* pData, unsigned long WordCount, unsigned long WordSize) { |
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unsigned long readWords = Read(pData, WordCount, WordSize); |
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if (readWords != WordCount) throw RIFF::Exception("End of chunk data reached."); |
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return readWords; |
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} |
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|
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/** |
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* Reads \a WordCount number of 8 Bit signed integer words and copies it |
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* into the buffer pointed by \a pData. The buffer has to be allocated. |
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* The position within the chunk will automatically be incremented. |
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* |
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* @param pData destination buffer |
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* @param WordCount number of 8 Bit signed integers to read |
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* @returns number of read integers |
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* @throws RIFF::Exception if an error occured or less than |
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* \a WordCount integers could be read! |
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*/ |
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unsigned long Chunk::ReadInt8(int8_t* pData, unsigned long WordCount) { |
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#if DEBUG |
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std::cout << "Chunk::ReadInt8(int8_t*,ulong)" << std::endl; |
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#endif // DEBUG |
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return ReadSceptical(pData, WordCount, 1); |
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} |
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|
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/** |
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* Writes \a WordCount number of 8 Bit signed integer words from the |
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* buffer pointed by \a pData to the chunk's body, directly to the |
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* actual "physical" file. The position within the chunk will |
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* automatically be incremented. Note: you cannot write beyond the |
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* boundaries of the chunk, to append data to the chunk call Resize() |
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* before. |
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* |
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* @param pData source buffer (containing the data) |
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* @param WordCount number of 8 Bit signed integers to write |
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* @returns number of written integers |
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* @throws RIFF::Exception if an IO error occured |
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* @see Resize() |
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*/ |
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unsigned long Chunk::WriteInt8(int8_t* pData, unsigned long WordCount) { |
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return Write(pData, WordCount, 1); |
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} |
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|
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/** |
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* Reads \a WordCount number of 8 Bit unsigned integer words and copies |
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* it into the buffer pointed by \a pData. The buffer has to be |
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* allocated. The position within the chunk will automatically be |
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* incremented. |
377 |
* |
378 |
* @param pData destination buffer |
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* @param WordCount number of 8 Bit unsigned integers to read |
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* @returns number of read integers |
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* @throws RIFF::Exception if an error occured or less than |
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* \a WordCount integers could be read! |
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*/ |
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unsigned long Chunk::ReadUint8(uint8_t* pData, unsigned long WordCount) { |
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#if DEBUG |
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std::cout << "Chunk::ReadUint8(uint8_t*,ulong)" << std::endl; |
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#endif // DEBUG |
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return ReadSceptical(pData, WordCount, 1); |
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} |
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|
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/** |
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* Writes \a WordCount number of 8 Bit unsigned integer words from the |
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* buffer pointed by \a pData to the chunk's body, directly to the |
394 |
* actual "physical" file. The position within the chunk will |
395 |
* automatically be incremented. Note: you cannot write beyond the |
396 |
* boundaries of the chunk, to append data to the chunk call Resize() |
397 |
* before. |
398 |
* |
399 |
* @param pData source buffer (containing the data) |
400 |
* @param WordCount number of 8 Bit unsigned integers to write |
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* @returns number of written integers |
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* @throws RIFF::Exception if an IO error occured |
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* @see Resize() |
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*/ |
405 |
unsigned long Chunk::WriteUint8(uint8_t* pData, unsigned long WordCount) { |
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return Write(pData, WordCount, 1); |
407 |
} |
408 |
|
409 |
/** |
410 |
* Reads \a WordCount number of 16 Bit signed integer words and copies |
411 |
* it into the buffer pointed by \a pData. The buffer has to be |
412 |
* allocated. Endian correction will automatically be done if needed. |
413 |
* The position within the chunk will automatically be incremented. |
414 |
* |
415 |
* @param pData destination buffer |
416 |
* @param WordCount number of 16 Bit signed integers to read |
417 |
* @returns number of read integers |
418 |
* @throws RIFF::Exception if an error occured or less than |
419 |
* \a WordCount integers could be read! |
420 |
*/ |
421 |
unsigned long Chunk::ReadInt16(int16_t* pData, unsigned long WordCount) { |
422 |
#if DEBUG |
423 |
std::cout << "Chunk::ReadInt16(int16_t*,ulong)" << std::endl; |
424 |
#endif // DEBUG |
425 |
return ReadSceptical(pData, WordCount, 2); |
426 |
} |
427 |
|
428 |
/** |
429 |
* Writes \a WordCount number of 16 Bit signed integer words from the |
430 |
* buffer pointed by \a pData to the chunk's body, directly to the |
431 |
* actual "physical" file. The position within the chunk will |
432 |
* automatically be incremented. Note: you cannot write beyond the |
433 |
* boundaries of the chunk, to append data to the chunk call Resize() |
434 |
* before. |
435 |
* |
436 |
* @param pData source buffer (containing the data) |
437 |
* @param WordCount number of 16 Bit signed integers to write |
438 |
* @returns number of written integers |
439 |
* @throws RIFF::Exception if an IO error occured |
440 |
* @see Resize() |
441 |
*/ |
442 |
unsigned long Chunk::WriteInt16(int16_t* pData, unsigned long WordCount) { |
443 |
return Write(pData, WordCount, 2); |
444 |
} |
445 |
|
446 |
/** |
447 |
* Reads \a WordCount number of 16 Bit unsigned integer words and copies |
448 |
* it into the buffer pointed by \a pData. The buffer has to be |
449 |
* allocated. Endian correction will automatically be done if needed. |
450 |
* The position within the chunk will automatically be incremented. |
451 |
* |
452 |
* @param pData destination buffer |
453 |
* @param WordCount number of 8 Bit unsigned integers to read |
454 |
* @returns number of read integers |
455 |
* @throws RIFF::Exception if an error occured or less than |
456 |
* \a WordCount integers could be read! |
457 |
*/ |
458 |
unsigned long Chunk::ReadUint16(uint16_t* pData, unsigned long WordCount) { |
459 |
#if DEBUG |
460 |
std::cout << "Chunk::ReadUint16(uint16_t*,ulong)" << std::endl; |
461 |
#endif // DEBUG |
462 |
return ReadSceptical(pData, WordCount, 2); |
463 |
} |
464 |
|
465 |
/** |
466 |
* Writes \a WordCount number of 16 Bit unsigned integer words from the |
467 |
* buffer pointed by \a pData to the chunk's body, directly to the |
468 |
* actual "physical" file. The position within the chunk will |
469 |
* automatically be incremented. Note: you cannot write beyond the |
470 |
* boundaries of the chunk, to append data to the chunk call Resize() |
471 |
* before. |
472 |
* |
473 |
* @param pData source buffer (containing the data) |
474 |
* @param WordCount number of 16 Bit unsigned integers to write |
475 |
* @returns number of written integers |
476 |
* @throws RIFF::Exception if an IO error occured |
477 |
* @see Resize() |
478 |
*/ |
479 |
unsigned long Chunk::WriteUint16(uint16_t* pData, unsigned long WordCount) { |
480 |
return Write(pData, WordCount, 2); |
481 |
} |
482 |
|
483 |
/** |
484 |
* Reads \a WordCount number of 32 Bit signed integer words and copies |
485 |
* it into the buffer pointed by \a pData. The buffer has to be |
486 |
* allocated. Endian correction will automatically be done if needed. |
487 |
* The position within the chunk will automatically be incremented. |
488 |
* |
489 |
* @param pData destination buffer |
490 |
* @param WordCount number of 32 Bit signed integers to read |
491 |
* @returns number of read integers |
492 |
* @throws RIFF::Exception if an error occured or less than |
493 |
* \a WordCount integers could be read! |
494 |
*/ |
495 |
unsigned long Chunk::ReadInt32(int32_t* pData, unsigned long WordCount) { |
496 |
#if DEBUG |
497 |
std::cout << "Chunk::ReadInt32(int32_t*,ulong)" << std::endl; |
498 |
#endif // DEBUG |
499 |
return ReadSceptical(pData, WordCount, 4); |
500 |
} |
501 |
|
502 |
/** |
503 |
* Writes \a WordCount number of 32 Bit signed integer words from the |
504 |
* buffer pointed by \a pData to the chunk's body, directly to the |
505 |
* actual "physical" file. The position within the chunk will |
506 |
* automatically be incremented. Note: you cannot write beyond the |
507 |
* boundaries of the chunk, to append data to the chunk call Resize() |
508 |
* before. |
509 |
* |
510 |
* @param pData source buffer (containing the data) |
511 |
* @param WordCount number of 32 Bit signed integers to write |
512 |
* @returns number of written integers |
513 |
* @throws RIFF::Exception if an IO error occured |
514 |
* @see Resize() |
515 |
*/ |
516 |
unsigned long Chunk::WriteInt32(int32_t* pData, unsigned long WordCount) { |
517 |
return Write(pData, WordCount, 4); |
518 |
} |
519 |
|
520 |
/** |
521 |
* Reads \a WordCount number of 32 Bit unsigned integer words and copies |
522 |
* it into the buffer pointed by \a pData. The buffer has to be |
523 |
* allocated. Endian correction will automatically be done if needed. |
524 |
* The position within the chunk will automatically be incremented. |
525 |
* |
526 |
* @param pData destination buffer |
527 |
* @param WordCount number of 32 Bit unsigned integers to read |
528 |
* @returns number of read integers |
529 |
* @throws RIFF::Exception if an error occured or less than |
530 |
* \a WordCount integers could be read! |
531 |
*/ |
532 |
unsigned long Chunk::ReadUint32(uint32_t* pData, unsigned long WordCount) { |
533 |
#if DEBUG |
534 |
std::cout << "Chunk::ReadUint32(uint32_t*,ulong)" << std::endl; |
535 |
#endif // DEBUG |
536 |
return ReadSceptical(pData, WordCount, 4); |
537 |
} |
538 |
|
539 |
/** |
540 |
* Writes \a WordCount number of 32 Bit unsigned integer words from the |
541 |
* buffer pointed by \a pData to the chunk's body, directly to the |
542 |
* actual "physical" file. The position within the chunk will |
543 |
* automatically be incremented. Note: you cannot write beyond the |
544 |
* boundaries of the chunk, to append data to the chunk call Resize() |
545 |
* before. |
546 |
* |
547 |
* @param pData source buffer (containing the data) |
548 |
* @param WordCount number of 32 Bit unsigned integers to write |
549 |
* @returns number of written integers |
550 |
* @throws RIFF::Exception if an IO error occured |
551 |
* @see Resize() |
552 |
*/ |
553 |
unsigned long Chunk::WriteUint32(uint32_t* pData, unsigned long WordCount) { |
554 |
return Write(pData, WordCount, 4); |
555 |
} |
556 |
|
557 |
/** |
558 |
* Reads one 8 Bit signed integer word and increments the position within |
559 |
* the chunk. |
560 |
* |
561 |
* @returns read integer word |
562 |
* @throws RIFF::Exception if an error occured |
563 |
*/ |
564 |
int8_t Chunk::ReadInt8() { |
565 |
#if DEBUG |
566 |
std::cout << "Chunk::ReadInt8()" << std::endl; |
567 |
#endif // DEBUG |
568 |
int8_t word; |
569 |
ReadSceptical(&word,1,1); |
570 |
return word; |
571 |
} |
572 |
|
573 |
/** |
574 |
* Reads one 8 Bit unsigned integer word and increments the position |
575 |
* within the chunk. |
576 |
* |
577 |
* @returns read integer word |
578 |
* @throws RIFF::Exception if an error occured |
579 |
*/ |
580 |
uint8_t Chunk::ReadUint8() { |
581 |
#if DEBUG |
582 |
std::cout << "Chunk::ReadUint8()" << std::endl; |
583 |
#endif // DEBUG |
584 |
uint8_t word; |
585 |
ReadSceptical(&word,1,1); |
586 |
return word; |
587 |
} |
588 |
|
589 |
/** |
590 |
* Reads one 16 Bit signed integer word and increments the position |
591 |
* within the chunk. Endian correction will automatically be done if |
592 |
* needed. |
593 |
* |
594 |
* @returns read integer word |
595 |
* @throws RIFF::Exception if an error occured |
596 |
*/ |
597 |
int16_t Chunk::ReadInt16() { |
598 |
#if DEBUG |
599 |
std::cout << "Chunk::ReadInt16()" << std::endl; |
600 |
#endif // DEBUG |
601 |
int16_t word; |
602 |
ReadSceptical(&word,1,2); |
603 |
return word; |
604 |
} |
605 |
|
606 |
/** |
607 |
* Reads one 16 Bit unsigned integer word and increments the position |
608 |
* within the chunk. Endian correction will automatically be done if |
609 |
* needed. |
610 |
* |
611 |
* @returns read integer word |
612 |
* @throws RIFF::Exception if an error occured |
613 |
*/ |
614 |
uint16_t Chunk::ReadUint16() { |
615 |
#if DEBUG |
616 |
std::cout << "Chunk::ReadUint16()" << std::endl; |
617 |
#endif // DEBUG |
618 |
uint16_t word; |
619 |
ReadSceptical(&word,1,2); |
620 |
return word; |
621 |
} |
622 |
|
623 |
/** |
624 |
* Reads one 32 Bit signed integer word and increments the position |
625 |
* within the chunk. Endian correction will automatically be done if |
626 |
* needed. |
627 |
* |
628 |
* @returns read integer word |
629 |
* @throws RIFF::Exception if an error occured |
630 |
*/ |
631 |
int32_t Chunk::ReadInt32() { |
632 |
#if DEBUG |
633 |
std::cout << "Chunk::ReadInt32()" << std::endl; |
634 |
#endif // DEBUG |
635 |
int32_t word; |
636 |
ReadSceptical(&word,1,4); |
637 |
return word; |
638 |
} |
639 |
|
640 |
/** |
641 |
* Reads one 32 Bit unsigned integer word and increments the position |
642 |
* within the chunk. Endian correction will automatically be done if |
643 |
* needed. |
644 |
* |
645 |
* @returns read integer word |
646 |
* @throws RIFF::Exception if an error occured |
647 |
*/ |
648 |
uint32_t Chunk::ReadUint32() { |
649 |
#if DEBUG |
650 |
std::cout << "Chunk::ReadUint32()" << std::endl; |
651 |
#endif // DEBUG |
652 |
uint32_t word; |
653 |
ReadSceptical(&word,1,4); |
654 |
return word; |
655 |
} |
656 |
|
657 |
/** @brief Load chunk body into RAM. |
658 |
* |
659 |
* Loads the whole chunk body into memory. You can modify the data in |
660 |
* RAM and save the data by calling File::Save() afterwards. |
661 |
* |
662 |
* <b>Caution:</b> the buffer pointer will be invalidated once |
663 |
* File::Save() was called. You have to call LoadChunkData() again to |
664 |
* get a new, valid pointer whenever File::Save() was called. |
665 |
* |
666 |
* You can call LoadChunkData() again if you previously scheduled to |
667 |
* enlarge this chunk with a Resize() call. In that case the buffer will |
668 |
* be enlarged to the new, scheduled chunk size and you can already |
669 |
* place the new chunk data to the buffer and finally call File::Save() |
670 |
* to enlarge the chunk physically and write the new data in one rush. |
671 |
* This approach is definitely recommended if you have to enlarge and |
672 |
* write new data to a lot of chunks. |
673 |
* |
674 |
* @returns a pointer to the data in RAM on success, NULL otherwise |
675 |
* @throws Exception if data buffer could not be enlarged |
676 |
* @see ReleaseChunkData() |
677 |
*/ |
678 |
void* Chunk::LoadChunkData() { |
679 |
if (!pChunkData && pFile->Filename != "") { |
680 |
#if POSIX |
681 |
if (lseek(pFile->hFileRead, ulStartPos, SEEK_SET) == -1) return NULL; |
682 |
#else |
683 |
if (fseek(pFile->hFileRead, ulStartPos, SEEK_SET)) return NULL; |
684 |
#endif // POSIX |
685 |
unsigned long ulBufferSize = (CurrentChunkSize > NewChunkSize) ? CurrentChunkSize : NewChunkSize; |
686 |
pChunkData = new uint8_t[ulBufferSize]; |
687 |
if (!pChunkData) return NULL; |
688 |
memset(pChunkData, 0, ulBufferSize); |
689 |
#if POSIX |
690 |
unsigned long readWords = read(pFile->hFileRead, pChunkData, GetSize()); |
691 |
#else |
692 |
unsigned long readWords = fread(pChunkData, 1, GetSize(), pFile->hFileRead); |
693 |
#endif // POSIX |
694 |
if (readWords != GetSize()) { |
695 |
delete[] pChunkData; |
696 |
return (pChunkData = NULL); |
697 |
} |
698 |
ulChunkDataSize = ulBufferSize; |
699 |
} else if (NewChunkSize > ulChunkDataSize) { |
700 |
uint8_t* pNewBuffer = new uint8_t[NewChunkSize]; |
701 |
if (!pNewBuffer) throw Exception("Could not enlarge chunk data buffer to " + ToString(NewChunkSize) + " bytes"); |
702 |
memset(pNewBuffer, 0 , NewChunkSize); |
703 |
memcpy(pNewBuffer, pChunkData, ulChunkDataSize); |
704 |
delete[] pChunkData; |
705 |
pChunkData = pNewBuffer; |
706 |
ulChunkDataSize = NewChunkSize; |
707 |
} |
708 |
return pChunkData; |
709 |
} |
710 |
|
711 |
/** @brief Free loaded chunk body from RAM. |
712 |
* |
713 |
* Frees loaded chunk body data from memory (RAM). You should call |
714 |
* File::Save() before calling this method if you modified the data to |
715 |
* make the changes persistent. |
716 |
*/ |
717 |
void Chunk::ReleaseChunkData() { |
718 |
if (pChunkData) { |
719 |
delete[] pChunkData; |
720 |
pChunkData = NULL; |
721 |
} |
722 |
} |
723 |
|
724 |
/** @brief Resize chunk. |
725 |
* |
726 |
* Resizes this chunk's body, that is the actual size of data possible |
727 |
* to be written to this chunk. This call will return immediately and |
728 |
* just schedule the resize operation. You should call File::Save() to |
729 |
* actually perform the resize operation(s) "physically" to the file. |
730 |
* As this can take a while on large files, it is recommended to call |
731 |
* Resize() first on all chunks which have to be resized and finally to |
732 |
* call File::Save() to perform all those resize operations in one rush. |
733 |
* |
734 |
* <b>Caution:</b> You cannot directly write to enlarged chunks before |
735 |
* calling File::Save() as this might exceed the current chunk's body |
736 |
* boundary! |
737 |
* |
738 |
* @param iNewSize - new chunk body size in bytes (must be greater than zero) |
739 |
* @throws RIFF::Exception if \a iNewSize is less than 1 |
740 |
* @see File::Save() |
741 |
*/ |
742 |
void Chunk::Resize(int iNewSize) { |
743 |
if (iNewSize <= 0) throw Exception("Chunk size must be at least one byte"); |
744 |
if (NewChunkSize == iNewSize) return; |
745 |
NewChunkSize = iNewSize; |
746 |
pFile->LogAsResized(this); |
747 |
} |
748 |
|
749 |
/** @brief Write chunk persistently e.g. to disk. |
750 |
* |
751 |
* Stores the chunk persistently to its actual "physical" file. |
752 |
* |
753 |
* @param ulWritePos - position within the "physical" file where this |
754 |
* chunk should be written to |
755 |
* @param ulCurrentDataOffset - offset of current (old) data within |
756 |
* the file |
757 |
* @returns new write position in the "physical" file, that is |
758 |
* \a ulWritePos incremented by this chunk's new size |
759 |
* (including its header size of course) |
760 |
*/ |
761 |
unsigned long Chunk::WriteChunk(unsigned long ulWritePos, unsigned long ulCurrentDataOffset) { |
762 |
const unsigned long ulOriginalPos = ulWritePos; |
763 |
ulWritePos += CHUNK_HEADER_SIZE; |
764 |
|
765 |
if (pFile->Mode != stream_mode_read_write) |
766 |
throw Exception("Cannot write list chunk, file has to be opened in read+write mode"); |
767 |
|
768 |
// if the whole chunk body was loaded into RAM |
769 |
if (pChunkData) { |
770 |
// make sure chunk data buffer in RAM is at least as large as the new chunk size |
771 |
LoadChunkData(); |
772 |
// write chunk data from RAM persistently to the file |
773 |
#if POSIX |
774 |
lseek(pFile->hFileWrite, ulWritePos, SEEK_SET); |
775 |
if (write(pFile->hFileWrite, pChunkData, NewChunkSize) != NewChunkSize) { |
776 |
throw Exception("Writing Chunk data (from RAM) failed"); |
777 |
} |
778 |
#else |
779 |
fseek(pFile->hFileWrite, ulWritePos, SEEK_SET); |
780 |
if (fwrite(pChunkData, 1, NewChunkSize, pFile->hFileWrite) != NewChunkSize) { |
781 |
throw Exception("Writing Chunk data (from RAM) failed"); |
782 |
} |
783 |
#endif // POSIX |
784 |
} else { |
785 |
// move chunk data from the end of the file to the appropriate position |
786 |
int8_t* pCopyBuffer = new int8_t[4096]; |
787 |
unsigned long ulToMove = (NewChunkSize < CurrentChunkSize) ? NewChunkSize : CurrentChunkSize; |
788 |
int iBytesMoved = 1; |
789 |
for (unsigned long ulOffset = 0; iBytesMoved > 0; ulOffset += iBytesMoved, ulToMove -= iBytesMoved) { |
790 |
iBytesMoved = (ulToMove < 4096) ? ulToMove : 4096; |
791 |
#if POSIX |
792 |
lseek(pFile->hFileRead, ulStartPos + ulCurrentDataOffset + ulOffset, SEEK_SET); |
793 |
iBytesMoved = read(pFile->hFileRead, pCopyBuffer, iBytesMoved); |
794 |
lseek(pFile->hFileWrite, ulWritePos + ulOffset, SEEK_SET); |
795 |
iBytesMoved = write(pFile->hFileWrite, pCopyBuffer, iBytesMoved); |
796 |
#else |
797 |
fseek(pFile->hFileRead, ulStartPos + ulCurrentDataOffset + ulOffset, SEEK_SET); |
798 |
iBytesMoved = fread(pCopyBuffer, 1, iBytesMoved, pFile->hFileRead); |
799 |
fseek(pFile->hFileWrite, ulWritePos + ulOffset, SEEK_SET); |
800 |
iBytesMoved = fwrite(pCopyBuffer, 1, iBytesMoved, pFile->hFileWrite); |
801 |
#endif |
802 |
} |
803 |
delete[] pCopyBuffer; |
804 |
if (iBytesMoved < 0) throw Exception("Writing Chunk data (from file) failed"); |
805 |
} |
806 |
|
807 |
// update this chunk's header |
808 |
CurrentChunkSize = NewChunkSize; |
809 |
WriteHeader(ulOriginalPos); |
810 |
|
811 |
// update chunk's position pointers |
812 |
ulStartPos = ulOriginalPos + CHUNK_HEADER_SIZE; |
813 |
ulPos = 0; |
814 |
|
815 |
// add pad byte if needed |
816 |
if ((ulStartPos + NewChunkSize) % 2 != 0) { |
817 |
const char cPadByte = 0; |
818 |
#if POSIX |
819 |
lseek(pFile->hFileWrite, ulStartPos + NewChunkSize, SEEK_SET); |
820 |
write(pFile->hFileWrite, &cPadByte, 1); |
821 |
#else |
822 |
fseek(pFile->hFileWrite, ulStartPos + NewChunkSize, SEEK_SET); |
823 |
fwrite(&cPadByte, 1, 1, pFile->hFileWrite); |
824 |
#endif |
825 |
return ulStartPos + NewChunkSize + 1; |
826 |
} |
827 |
|
828 |
return ulStartPos + NewChunkSize; |
829 |
} |
830 |
|
831 |
void Chunk::__resetPos() { |
832 |
ulPos = 0; |
833 |
} |
834 |
|
835 |
|
836 |
|
837 |
// *************** List *************** |
838 |
// * |
839 |
|
840 |
List::List(File* pFile) : Chunk(pFile) { |
841 |
#if DEBUG |
842 |
std::cout << "List::List(File* pFile)" << std::endl; |
843 |
#endif // DEBUG |
844 |
pSubChunks = NULL; |
845 |
pSubChunksMap = NULL; |
846 |
} |
847 |
|
848 |
List::List(File* pFile, unsigned long StartPos, List* Parent) |
849 |
: Chunk(pFile, StartPos, Parent) { |
850 |
#if DEBUG |
851 |
std::cout << "List::List(File*,ulong,bool,List*)" << std::endl; |
852 |
#endif // DEBUG |
853 |
pSubChunks = NULL; |
854 |
pSubChunksMap = NULL; |
855 |
ReadHeader(StartPos); |
856 |
ulStartPos = StartPos + LIST_HEADER_SIZE; |
857 |
} |
858 |
|
859 |
List::List(File* pFile, List* pParent, uint32_t uiListID) |
860 |
: Chunk(pFile, pParent, CHUNK_ID_LIST, 0) { |
861 |
pSubChunks = NULL; |
862 |
pSubChunksMap = NULL; |
863 |
ListType = uiListID; |
864 |
} |
865 |
|
866 |
List::~List() { |
867 |
#if DEBUG |
868 |
std::cout << "List::~List()" << std::endl; |
869 |
#endif // DEBUG |
870 |
if (pSubChunks) { |
871 |
ChunkList::iterator iter = pSubChunks->begin(); |
872 |
ChunkList::iterator end = pSubChunks->end(); |
873 |
while (iter != end) { |
874 |
delete *iter; |
875 |
iter++; |
876 |
} |
877 |
delete pSubChunks; |
878 |
} |
879 |
if (pSubChunksMap) delete pSubChunksMap; |
880 |
} |
881 |
|
882 |
/** |
883 |
* Returns subchunk with chunk ID <i>\a ChunkID</i> within this chunk |
884 |
* list. Use this method if you expect only one subchunk of that type in |
885 |
* the list. It there are more than one, it's undetermined which one of |
886 |
* them will be returned! If there are no subchunks with that desired |
887 |
* chunk ID, NULL will be returned. |
888 |
* |
889 |
* @param ChunkID - chunk ID of the sought subchunk |
890 |
* @returns pointer to the subchunk or NULL if there is none of |
891 |
* that ID |
892 |
*/ |
893 |
Chunk* List::GetSubChunk(uint32_t ChunkID) { |
894 |
#if DEBUG |
895 |
std::cout << "List::GetSubChunk(uint32_t)" << std::endl; |
896 |
#endif // DEBUG |
897 |
if (!pSubChunksMap) LoadSubChunks(); |
898 |
return (*pSubChunksMap)[ChunkID]; |
899 |
} |
900 |
|
901 |
/** |
902 |
* Returns sublist chunk with list type <i>\a ListType</i> within this |
903 |
* chunk list. Use this method if you expect only one sublist chunk of |
904 |
* that type in the list. It there are more than one, it's undetermined |
905 |
* which one of them will be returned! If there are no sublists with |
906 |
* that desired list type, NULL will be returned. |
907 |
* |
908 |
* @param ListType - list type of the sought sublist |
909 |
* @returns pointer to the sublist or NULL if there is none of |
910 |
* that type |
911 |
*/ |
912 |
List* List::GetSubList(uint32_t ListType) { |
913 |
#if DEBUG |
914 |
std::cout << "List::GetSubList(uint32_t)" << std::endl; |
915 |
#endif // DEBUG |
916 |
if (!pSubChunks) LoadSubChunks(); |
917 |
ChunkList::iterator iter = pSubChunks->begin(); |
918 |
ChunkList::iterator end = pSubChunks->end(); |
919 |
while (iter != end) { |
920 |
if ((*iter)->GetChunkID() == CHUNK_ID_LIST) { |
921 |
List* l = (List*) *iter; |
922 |
if (l->GetListType() == ListType) return l; |
923 |
} |
924 |
iter++; |
925 |
} |
926 |
return NULL; |
927 |
} |
928 |
|
929 |
/** |
930 |
* Returns the first subchunk within the list. You have to call this |
931 |
* method before you can call GetNextSubChunk(). Recall it when you want |
932 |
* to start from the beginning of the list again. |
933 |
* |
934 |
* @returns pointer to the first subchunk within the list, NULL |
935 |
* otherwise |
936 |
*/ |
937 |
Chunk* List::GetFirstSubChunk() { |
938 |
#if DEBUG |
939 |
std::cout << "List::GetFirstSubChunk()" << std::endl; |
940 |
#endif // DEBUG |
941 |
if (!pSubChunks) LoadSubChunks(); |
942 |
ChunksIterator = pSubChunks->begin(); |
943 |
return (ChunksIterator != pSubChunks->end()) ? *ChunksIterator : NULL; |
944 |
} |
945 |
|
946 |
/** |
947 |
* Returns the next subchunk within the list. You have to call |
948 |
* GetFirstSubChunk() before you can use this method! |
949 |
* |
950 |
* @returns pointer to the next subchunk within the list or NULL if |
951 |
* end of list is reached |
952 |
*/ |
953 |
Chunk* List::GetNextSubChunk() { |
954 |
#if DEBUG |
955 |
std::cout << "List::GetNextSubChunk()" << std::endl; |
956 |
#endif // DEBUG |
957 |
if (!pSubChunks) return NULL; |
958 |
ChunksIterator++; |
959 |
return (ChunksIterator != pSubChunks->end()) ? *ChunksIterator : NULL; |
960 |
} |
961 |
|
962 |
/** |
963 |
* Returns the first sublist within the list (that is a subchunk with |
964 |
* chunk ID "LIST"). You have to call this method before you can call |
965 |
* GetNextSubList(). Recall it when you want to start from the beginning |
966 |
* of the list again. |
967 |
* |
968 |
* @returns pointer to the first sublist within the list, NULL |
969 |
* otherwise |
970 |
*/ |
971 |
List* List::GetFirstSubList() { |
972 |
#if DEBUG |
973 |
std::cout << "List::GetFirstSubList()" << std::endl; |
974 |
#endif // DEBUG |
975 |
if (!pSubChunks) LoadSubChunks(); |
976 |
ListIterator = pSubChunks->begin(); |
977 |
ChunkList::iterator end = pSubChunks->end(); |
978 |
while (ListIterator != end) { |
979 |
if ((*ListIterator)->GetChunkID() == CHUNK_ID_LIST) return (List*) *ListIterator; |
980 |
ListIterator++; |
981 |
} |
982 |
return NULL; |
983 |
} |
984 |
|
985 |
/** |
986 |
* Returns the next sublist (that is a subchunk with chunk ID "LIST") |
987 |
* within the list. You have to call GetFirstSubList() before you can |
988 |
* use this method! |
989 |
* |
990 |
* @returns pointer to the next sublist within the list, NULL if |
991 |
* end of list is reached |
992 |
*/ |
993 |
List* List::GetNextSubList() { |
994 |
#if DEBUG |
995 |
std::cout << "List::GetNextSubList()" << std::endl; |
996 |
#endif // DEBUG |
997 |
if (!pSubChunks) return NULL; |
998 |
if (ListIterator == pSubChunks->end()) return NULL; |
999 |
ListIterator++; |
1000 |
ChunkList::iterator end = pSubChunks->end(); |
1001 |
while (ListIterator != end) { |
1002 |
if ((*ListIterator)->GetChunkID() == CHUNK_ID_LIST) return (List*) *ListIterator; |
1003 |
ListIterator++; |
1004 |
} |
1005 |
return NULL; |
1006 |
} |
1007 |
|
1008 |
/** |
1009 |
* Returns number of subchunks within the list. |
1010 |
*/ |
1011 |
unsigned int List::CountSubChunks() { |
1012 |
if (!pSubChunks) LoadSubChunks(); |
1013 |
return pSubChunks->size(); |
1014 |
} |
1015 |
|
1016 |
/** |
1017 |
* Returns number of subchunks within the list with chunk ID |
1018 |
* <i>\a ChunkId</i>. |
1019 |
*/ |
1020 |
unsigned int List::CountSubChunks(uint32_t ChunkID) { |
1021 |
unsigned int result = 0; |
1022 |
if (!pSubChunks) LoadSubChunks(); |
1023 |
ChunkList::iterator iter = pSubChunks->begin(); |
1024 |
ChunkList::iterator end = pSubChunks->end(); |
1025 |
while (iter != end) { |
1026 |
if ((*iter)->GetChunkID() == ChunkID) { |
1027 |
result++; |
1028 |
} |
1029 |
iter++; |
1030 |
} |
1031 |
return result; |
1032 |
} |
1033 |
|
1034 |
/** |
1035 |
* Returns number of sublists within the list. |
1036 |
*/ |
1037 |
unsigned int List::CountSubLists() { |
1038 |
return CountSubChunks(CHUNK_ID_LIST); |
1039 |
} |
1040 |
|
1041 |
/** |
1042 |
* Returns number of sublists within the list with list type |
1043 |
* <i>\a ListType</i> |
1044 |
*/ |
1045 |
unsigned int List::CountSubLists(uint32_t ListType) { |
1046 |
unsigned int result = 0; |
1047 |
if (!pSubChunks) LoadSubChunks(); |
1048 |
ChunkList::iterator iter = pSubChunks->begin(); |
1049 |
ChunkList::iterator end = pSubChunks->end(); |
1050 |
while (iter != end) { |
1051 |
if ((*iter)->GetChunkID() == CHUNK_ID_LIST) { |
1052 |
List* l = (List*) *iter; |
1053 |
if (l->GetListType() == ListType) result++; |
1054 |
} |
1055 |
iter++; |
1056 |
} |
1057 |
return result; |
1058 |
} |
1059 |
|
1060 |
/** @brief Creates a new sub chunk. |
1061 |
* |
1062 |
* Creates and adds a new sub chunk to this list chunk. Note that the |
1063 |
* chunk's body size given by \a uiBodySize must be greater than zero. |
1064 |
* You have to call File::Save() to make this change persistent to the |
1065 |
* actual file and <b>before</b> performing any data write operations |
1066 |
* on the new chunk! |
1067 |
* |
1068 |
* @param uiChunkID - chunk ID of the new chunk |
1069 |
* @param uiBodySize - size of the new chunk's body, that is its actual |
1070 |
* data size (without header) |
1071 |
* @throws RIFF::Exception if \a uiBodySize equals zero |
1072 |
*/ |
1073 |
Chunk* List::AddSubChunk(uint32_t uiChunkID, uint uiBodySize) { |
1074 |
if (uiBodySize == 0) throw Exception("Chunk body size must be at least 1 byte"); |
1075 |
if (!pSubChunks) LoadSubChunks(); |
1076 |
Chunk* pNewChunk = new Chunk(pFile, this, uiChunkID, 0); |
1077 |
pSubChunks->push_back(pNewChunk); |
1078 |
(*pSubChunksMap)[uiChunkID] = pNewChunk; |
1079 |
pNewChunk->Resize(uiBodySize); |
1080 |
return pNewChunk; |
1081 |
} |
1082 |
|
1083 |
/** @brief Creates a new list sub chunk. |
1084 |
* |
1085 |
* Creates and adds a new list sub chunk to this list chunk. Note that |
1086 |
* you have to add sub chunks / sub list chunks to the new created chunk |
1087 |
* <b>before</b> trying to make this change persisten to the actual |
1088 |
* file with File::Save()! |
1089 |
* |
1090 |
* @param uiListType - list ID of the new list chunk |
1091 |
*/ |
1092 |
List* List::AddSubList(uint32_t uiListType) { |
1093 |
if (!pSubChunks) LoadSubChunks(); |
1094 |
List* pNewListChunk = new List(pFile, this, uiListType); |
1095 |
pSubChunks->push_back(pNewListChunk); |
1096 |
(*pSubChunksMap)[CHUNK_ID_LIST] = pNewListChunk; |
1097 |
return pNewListChunk; |
1098 |
} |
1099 |
|
1100 |
/** @brief Removes a sub chunk. |
1101 |
* |
1102 |
* Removes the sub chunk given by \a pSubChunk from this list and frees |
1103 |
* it completely from RAM. The given chunk can either be a normal sub |
1104 |
* chunk or a list sub chunk. You should call File::Save() to make this |
1105 |
* change persistent at any time. |
1106 |
* |
1107 |
* @param pSubChunk - sub chunk or sub list chunk to be removed |
1108 |
*/ |
1109 |
void List::DeleteSubChunk(Chunk* pSubChunk) { |
1110 |
if (!pSubChunks) LoadSubChunks(); |
1111 |
pSubChunks->remove(pSubChunk); |
1112 |
if ((*pSubChunksMap)[pSubChunk->GetChunkID()] == pSubChunk) { |
1113 |
pSubChunksMap->erase(pSubChunk->GetChunkID()); |
1114 |
// try to find another chunk of the same chunk ID |
1115 |
ChunkList::iterator iter = pSubChunks->begin(); |
1116 |
ChunkList::iterator end = pSubChunks->end(); |
1117 |
for (; iter != end; ++iter) { |
1118 |
if ((*iter)->GetChunkID() == pSubChunk->GetChunkID()) { |
1119 |
(*pSubChunksMap)[pSubChunk->GetChunkID()] = *iter; |
1120 |
break; // we're done, stop search |
1121 |
} |
1122 |
} |
1123 |
} |
1124 |
delete pSubChunk; |
1125 |
} |
1126 |
|
1127 |
void List::ReadHeader(unsigned long fPos) { |
1128 |
#if DEBUG |
1129 |
std::cout << "List::Readheader(ulong) "; |
1130 |
#endif // DEBUG |
1131 |
Chunk::ReadHeader(fPos); |
1132 |
NewChunkSize = CurrentChunkSize -= 4; |
1133 |
#if POSIX |
1134 |
lseek(pFile->hFileRead, fPos + CHUNK_HEADER_SIZE, SEEK_SET); |
1135 |
read(pFile->hFileRead, &ListType, 4); |
1136 |
#else |
1137 |
fseek(pFile->hFileRead, fPos + CHUNK_HEADER_SIZE, SEEK_SET); |
1138 |
fread(&ListType, 4, 1, pFile->hFileRead); |
1139 |
#endif // POSIX |
1140 |
#if DEBUG |
1141 |
std::cout << "listType=" << convertToString(ListType) << std::endl; |
1142 |
#endif // DEBUG |
1143 |
if (!pFile->bEndianNative) { |
1144 |
//swapBytes_32(&ListType); |
1145 |
} |
1146 |
} |
1147 |
|
1148 |
void List::WriteHeader(unsigned long fPos) { |
1149 |
// the four list type bytes officially belong the chunk's body in the RIFF format |
1150 |
NewChunkSize += 4; |
1151 |
Chunk::WriteHeader(fPos); |
1152 |
NewChunkSize -= 4; // just revert the +4 incrementation |
1153 |
#if POSIX |
1154 |
lseek(pFile->hFileWrite, fPos + CHUNK_HEADER_SIZE, SEEK_SET); |
1155 |
write(pFile->hFileWrite, &ListType, 4); |
1156 |
#else |
1157 |
fseek(pFile->hFileWrite, fPos + CHUNK_HEADER_SIZE, SEEK_SET); |
1158 |
fwrite(&ListType, 4, 1, pFile->hFileWrite); |
1159 |
#endif // POSIX |
1160 |
} |
1161 |
|
1162 |
void List::LoadSubChunks() { |
1163 |
#if DEBUG |
1164 |
std::cout << "List::LoadSubChunks()"; |
1165 |
#endif // DEBUG |
1166 |
if (!pSubChunks) { |
1167 |
pSubChunks = new ChunkList(); |
1168 |
pSubChunksMap = new ChunkMap(); |
1169 |
if (!pFile->hFileRead) return; |
1170 |
unsigned long uiOriginalPos = GetPos(); |
1171 |
SetPos(0); // jump to beginning of list chunk body |
1172 |
while (RemainingBytes() >= CHUNK_HEADER_SIZE) { |
1173 |
Chunk* ck; |
1174 |
uint32_t ckid; |
1175 |
Read(&ckid, 4, 1); |
1176 |
#if DEBUG |
1177 |
std::cout << " ckid=" << convertToString(ckid) << std::endl; |
1178 |
#endif // DEBUG |
1179 |
if (ckid == CHUNK_ID_LIST) { |
1180 |
ck = new RIFF::List(pFile, ulStartPos + ulPos - 4, this); |
1181 |
SetPos(ck->GetSize() + LIST_HEADER_SIZE - 4, RIFF::stream_curpos); |
1182 |
} |
1183 |
else { // simple chunk |
1184 |
ck = new RIFF::Chunk(pFile, ulStartPos + ulPos - 4, this); |
1185 |
SetPos(ck->GetSize() + CHUNK_HEADER_SIZE - 4, RIFF::stream_curpos); |
1186 |
} |
1187 |
pSubChunks->push_back(ck); |
1188 |
(*pSubChunksMap)[ckid] = ck; |
1189 |
if (GetPos() % 2 != 0) SetPos(1, RIFF::stream_curpos); // jump over pad byte |
1190 |
} |
1191 |
SetPos(uiOriginalPos); // restore position before this call |
1192 |
} |
1193 |
} |
1194 |
|
1195 |
/** @brief Write list chunk persistently e.g. to disk. |
1196 |
* |
1197 |
* Stores the list chunk persistently to its actual "physical" file. All |
1198 |
* subchunks (including sub list chunks) will be stored recursively as |
1199 |
* well. |
1200 |
* |
1201 |
* @param ulWritePos - position within the "physical" file where this |
1202 |
* list chunk should be written to |
1203 |
* @param ulCurrentDataOffset - offset of current (old) data within |
1204 |
* the file |
1205 |
* @returns new write position in the "physical" file, that is |
1206 |
* \a ulWritePos incremented by this list chunk's new size |
1207 |
* (including its header size of course) |
1208 |
*/ |
1209 |
unsigned long List::WriteChunk(unsigned long ulWritePos, unsigned long ulCurrentDataOffset) { |
1210 |
const unsigned long ulOriginalPos = ulWritePos; |
1211 |
ulWritePos += LIST_HEADER_SIZE; |
1212 |
|
1213 |
if (pFile->Mode != stream_mode_read_write) |
1214 |
throw Exception("Cannot write list chunk, file has to be opened in read+write mode"); |
1215 |
|
1216 |
// write all subchunks (including sub list chunks) recursively |
1217 |
if (pSubChunks) { |
1218 |
for (ChunkList::iterator iter = pSubChunks->begin(), end = pSubChunks->end(); iter != end; ++iter) { |
1219 |
ulWritePos = (*iter)->WriteChunk(ulWritePos, ulCurrentDataOffset); |
1220 |
} |
1221 |
} |
1222 |
|
1223 |
// update this list chunk's header |
1224 |
CurrentChunkSize = NewChunkSize = ulWritePos - ulOriginalPos - LIST_HEADER_SIZE; |
1225 |
WriteHeader(ulOriginalPos); |
1226 |
|
1227 |
// offset of this list chunk in new written file may have changed |
1228 |
ulStartPos = ulOriginalPos + LIST_HEADER_SIZE; |
1229 |
|
1230 |
return ulWritePos; |
1231 |
} |
1232 |
|
1233 |
void List::__resetPos() { |
1234 |
Chunk::__resetPos(); |
1235 |
if (pSubChunks) { |
1236 |
for (ChunkList::iterator iter = pSubChunks->begin(), end = pSubChunks->end(); iter != end; ++iter) { |
1237 |
(*iter)->__resetPos(); |
1238 |
} |
1239 |
} |
1240 |
} |
1241 |
|
1242 |
/** |
1243 |
* Returns string representation of the lists's id |
1244 |
*/ |
1245 |
String List::GetListTypeString() { |
1246 |
return convertToString(ListType); |
1247 |
} |
1248 |
|
1249 |
|
1250 |
|
1251 |
// *************** File *************** |
1252 |
// * |
1253 |
|
1254 |
/** @brief Create new RIFF file. |
1255 |
* |
1256 |
* Use this constructor if you want to create a new RIFF file completely |
1257 |
* "from scratch". Note: there must be no empty chunks or empty list |
1258 |
* chunks when trying to make the new RIFF file persistent with Save()! |
1259 |
* |
1260 |
* @param FileType - four-byte identifier of the RIFF file type |
1261 |
* @see AddSubChunk(), AddSubList() |
1262 |
*/ |
1263 |
File::File(uint32_t FileType) : List(this) { |
1264 |
hFileRead = hFileWrite = 0; |
1265 |
Mode = stream_mode_closed; |
1266 |
bEndianNative = true; |
1267 |
ulStartPos = RIFF_HEADER_SIZE; |
1268 |
ListType = FileType; |
1269 |
} |
1270 |
|
1271 |
/** @brief Load existing RIFF file. |
1272 |
* |
1273 |
* Loads an existing RIFF file with all its chunks. |
1274 |
* |
1275 |
* @param path - path and file name of the RIFF file to open |
1276 |
* @throws RIFF::Exception if error occured while trying to load the |
1277 |
* given RIFF file |
1278 |
*/ |
1279 |
File::File(const String& path) : List(this), Filename(path) { |
1280 |
#if DEBUG |
1281 |
std::cout << "File::File("<<path<<")" << std::endl; |
1282 |
#endif // DEBUG |
1283 |
bEndianNative = true; |
1284 |
#if POSIX |
1285 |
hFileRead = hFileWrite = open(path.c_str(), O_RDONLY | O_NONBLOCK); |
1286 |
if (hFileRead <= 0) { |
1287 |
hFileRead = hFileWrite = 0; |
1288 |
throw RIFF::Exception("Can't open \"" + path + "\""); |
1289 |
} |
1290 |
#else |
1291 |
hFileRead = hFileWrite = fopen(path.c_str(), "rb"); |
1292 |
if (!hFile) throw RIFF::Exception("Can't open \"" + path + "\""); |
1293 |
#endif // POSIX |
1294 |
Mode = stream_mode_read; |
1295 |
ulStartPos = RIFF_HEADER_SIZE; |
1296 |
ReadHeader(0); |
1297 |
if (ChunkID != CHUNK_ID_RIFF) { |
1298 |
throw RIFF::Exception("Not a RIFF file"); |
1299 |
} |
1300 |
} |
1301 |
|
1302 |
String File::GetFileName() { |
1303 |
return Filename; |
1304 |
} |
1305 |
|
1306 |
stream_mode_t File::GetMode() { |
1307 |
return Mode; |
1308 |
} |
1309 |
|
1310 |
/** @brief Change file access mode. |
1311 |
* |
1312 |
* Changes files access mode either to read-only mode or to read/write |
1313 |
* mode. |
1314 |
* |
1315 |
* @param NewMode - new file access mode |
1316 |
* @returns true if mode was changed, false if current mode already |
1317 |
* equals new mode |
1318 |
* @throws RIFF::Exception if new file access mode is unknown |
1319 |
*/ |
1320 |
bool File::SetMode(stream_mode_t NewMode) { |
1321 |
if (NewMode != Mode) { |
1322 |
switch (NewMode) { |
1323 |
case stream_mode_read: |
1324 |
#if POSIX |
1325 |
if (hFileRead) close(hFileRead); |
1326 |
hFileRead = hFileWrite = open(Filename.c_str(), O_RDONLY | O_NONBLOCK); |
1327 |
if (hFileRead < 0) { |
1328 |
hFileRead = hFileWrite = 0; |
1329 |
throw Exception("Could not (re)open file \"" + Filename + "\" in read mode"); |
1330 |
} |
1331 |
#else |
1332 |
if (hFileRead) fclose(hFileRead); |
1333 |
hFileRead = hFileWrite = fopen(path.c_str(), "rb"); |
1334 |
if (!hFileRead) throw Exception("Could not (re)open file \"" + Filename + "\" in read mode"); |
1335 |
#endif |
1336 |
__resetPos(); // reset read/write position of ALL 'Chunk' objects |
1337 |
break; |
1338 |
case stream_mode_read_write: |
1339 |
#if POSIX |
1340 |
if (hFileRead) close(hFileRead); |
1341 |
hFileRead = hFileWrite = open(Filename.c_str(), O_RDWR | O_NONBLOCK); |
1342 |
if (hFileRead < 0) { |
1343 |
hFileRead = hFileWrite = open(Filename.c_str(), O_RDONLY | O_NONBLOCK); |
1344 |
throw Exception("Could not open file \"" + Filename + "\" in read+write mode"); |
1345 |
} |
1346 |
#else |
1347 |
if (hFileRead) fclose(hFileRead); |
1348 |
hFileRead = hFileWrite = fopen(path.c_str(), "r+b"); |
1349 |
if (!hFileRead) { |
1350 |
hFileRead = hFileWrite = fopen(path.c_str(), "rb"); |
1351 |
throw Exception("Could not open file \"" + Filename + "\" in read+write mode"); |
1352 |
} |
1353 |
#endif |
1354 |
__resetPos(); // reset read/write position of ALL 'Chunk' objects |
1355 |
break; |
1356 |
case stream_mode_closed: |
1357 |
#if POSIX |
1358 |
if (hFileRead) close(hFileRead); |
1359 |
if (hFileWrite) close(hFileWrite); |
1360 |
#else |
1361 |
if (hFileRead) fclose(hFileRead); |
1362 |
if (hFileWrite) fclose(hFileWrite); |
1363 |
#endif |
1364 |
hFileRead = hFileWrite = 0; |
1365 |
break; |
1366 |
default: |
1367 |
throw Exception("Unknown file access mode"); |
1368 |
} |
1369 |
Mode = NewMode; |
1370 |
return true; |
1371 |
} |
1372 |
return false; |
1373 |
} |
1374 |
|
1375 |
/** @brief Save changes to same file. |
1376 |
* |
1377 |
* Make all changes of all chunks persistent by writing them to the |
1378 |
* actual (same) file. The file might temporarily grow to a higher size |
1379 |
* than it will have at the end of the saving process, in case chunks |
1380 |
* were grown. |
1381 |
* |
1382 |
* @throws RIFF::Exception if there is an empty chunk or empty list |
1383 |
* chunk or any kind of IO error occured |
1384 |
*/ |
1385 |
void File::Save() { |
1386 |
// reopen file in write mode |
1387 |
SetMode(stream_mode_read_write); |
1388 |
|
1389 |
// to be able to save the whole file without loading everything into |
1390 |
// RAM and without having to store the data in a temporary file, we |
1391 |
// enlarge the file with the sum of all _positive_ chunk size |
1392 |
// changes, move current data towards the end of the file with the |
1393 |
// calculated sum and finally update / rewrite the file by copying |
1394 |
// the old data back to the right position at the beginning of the file |
1395 |
|
1396 |
// first we sum up all positive chunk size changes (and skip all negative ones) |
1397 |
unsigned long ulPositiveSizeDiff = 0; |
1398 |
for (ChunkList::iterator iter = ResizedChunks.begin(), end = ResizedChunks.end(); iter != end; ++iter) { |
1399 |
if ((*iter)->GetNewSize() == 0) throw Exception("There is at least one empty chunk (zero size)"); |
1400 |
if ((*iter)->GetNewSize() + 1L > (*iter)->GetSize()) { |
1401 |
unsigned long ulDiff = (*iter)->GetNewSize() - (*iter)->GetSize() + 1L; // +1 in case we have to add a pad byte |
1402 |
ulPositiveSizeDiff += ulDiff; |
1403 |
} |
1404 |
} |
1405 |
|
1406 |
unsigned long ulWorkingFileSize = GetFileSize(); |
1407 |
|
1408 |
// if there are positive size changes... |
1409 |
if (ulPositiveSizeDiff > 0) { |
1410 |
// ... we enlarge this file first ... |
1411 |
ulWorkingFileSize += ulPositiveSizeDiff; |
1412 |
ResizeFile(ulWorkingFileSize); |
1413 |
// ... and move current data by the same amount towards end of file. |
1414 |
int8_t* pCopyBuffer = new int8_t[4096]; |
1415 |
const unsigned long ulFileSize = GetSize() + RIFF_HEADER_SIZE; |
1416 |
int iBytesMoved = 1; |
1417 |
for (unsigned long ulPos = 0; iBytesMoved > 0; ulPos += iBytesMoved) { |
1418 |
const unsigned long ulToMove = ulFileSize - ulPos; |
1419 |
iBytesMoved = (ulToMove < 4096) ? ulToMove : 4096; |
1420 |
#if POSIX |
1421 |
lseek(hFileRead, ulPos, SEEK_SET); |
1422 |
iBytesMoved = read(hFileRead, pCopyBuffer, iBytesMoved); |
1423 |
lseek(hFileWrite, ulPos + ulPositiveSizeDiff, SEEK_SET); |
1424 |
iBytesMoved = write(hFileWrite, pCopyBuffer, iBytesMoved); |
1425 |
#else |
1426 |
fseek(hFileRead, ulPos, SEEK_SET); |
1427 |
iBytesMoved = fread(pCopyBuffer, 1, iBytesMoved, hFileRead); |
1428 |
fseek(hFileWrite, ulPos + ulPositiveSizeDiff, SEEK_SET); |
1429 |
iBytesMoved = fwrite(pCopyBuffer, 1, iBytesMoved, hFileWrite); |
1430 |
#endif |
1431 |
} |
1432 |
delete[] pCopyBuffer; |
1433 |
if (iBytesMoved < 0) throw Exception("Could not modify file while trying to enlarge it"); |
1434 |
} |
1435 |
|
1436 |
// rebuild / rewrite complete RIFF tree |
1437 |
unsigned long ulTotalSize = WriteChunk(0, ulPositiveSizeDiff); |
1438 |
unsigned long ulActualSize = __GetFileSize(hFileWrite); |
1439 |
|
1440 |
// resize file to the final size |
1441 |
if (ulTotalSize < ulActualSize) ResizeFile(ulTotalSize); |
1442 |
|
1443 |
// forget all resized chunks |
1444 |
ResizedChunks.clear(); |
1445 |
} |
1446 |
|
1447 |
/** @brief Save changes to another file. |
1448 |
* |
1449 |
* Make all changes of all chunks persistent by writing them to another |
1450 |
* file. <b>Caution:</b> this method is optimized for writing to |
1451 |
* <b>another</b> file, do not use it to save the changes to the same |
1452 |
* file! Use File::Save() in that case instead! Ignoring this might |
1453 |
* result in a corrupted file, especially in case chunks were resized! |
1454 |
* |
1455 |
* After calling this method, this File object will be associated with |
1456 |
* the new file (given by \a path) afterwards. |
1457 |
* |
1458 |
* @param path - path and file name where everything should be written to |
1459 |
*/ |
1460 |
void File::Save(const String& path) { |
1461 |
//TODO: we should make a check here if somebody tries to write to the same file and automatically call the other Save() method in that case |
1462 |
|
1463 |
if (Filename.length() > 0) SetMode(stream_mode_read); |
1464 |
// open the other (new) file for writing and truncate it to zero size |
1465 |
#if POSIX |
1466 |
hFileWrite = open(path.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP); |
1467 |
if (hFileWrite < 0) { |
1468 |
hFileWrite = hFileRead; |
1469 |
throw Exception("Could not open file \"" + path + "\" for writing"); |
1470 |
} |
1471 |
#else |
1472 |
hFileWrite = fopen(path.c_str(), "w+b"); |
1473 |
if (!hFileWrite) { |
1474 |
hFileWrite = hFileRead; |
1475 |
throw Exception("Could not open file \"" + path + "\" for writing"); |
1476 |
} |
1477 |
#endif // POSIX |
1478 |
Mode = stream_mode_read_write; |
1479 |
|
1480 |
// write complete RIFF tree to the other (new) file |
1481 |
unsigned long ulTotalSize = WriteChunk(0, 0); |
1482 |
unsigned long ulActualSize = __GetFileSize(hFileWrite); |
1483 |
|
1484 |
// resize file to the final size (if the file was originally larger) |
1485 |
if (ulTotalSize < ulActualSize) ResizeFile(ulTotalSize); |
1486 |
|
1487 |
// forget all resized chunks |
1488 |
ResizedChunks.clear(); |
1489 |
|
1490 |
if (Filename.length() > 0) { |
1491 |
#if POSIX |
1492 |
close(hFileWrite); |
1493 |
#else |
1494 |
fclose(hFileWrite); |
1495 |
#endif |
1496 |
hFileWrite = hFileRead; |
1497 |
} |
1498 |
|
1499 |
// associate new file with this File object from now on |
1500 |
Filename = path; |
1501 |
Mode = (stream_mode_t) -1; // Just set it to an undefined mode ... |
1502 |
SetMode(stream_mode_read_write); // ... so SetMode() has to reopen the file handles. |
1503 |
} |
1504 |
|
1505 |
void File::ResizeFile(unsigned long ulNewSize) { |
1506 |
#if POSIX |
1507 |
if (ftruncate(hFileWrite, ulNewSize) < 0) |
1508 |
throw Exception("Could not resize file \"" + Filename + "\""); |
1509 |
#else |
1510 |
# error Sorry, this version of libgig only supports POSIX systems yet. |
1511 |
# error Reason: portable implementation of RIFF::File::ResizeFile() is missing (yet)! |
1512 |
#endif |
1513 |
} |
1514 |
|
1515 |
File::~File() { |
1516 |
#if DEBUG |
1517 |
std::cout << "File::~File()" << std::endl; |
1518 |
#endif // DEBUG |
1519 |
#if POSIX |
1520 |
if (hFileRead) close(hFileRead); |
1521 |
#else |
1522 |
if (hFileRead) fclose(hFileRead); |
1523 |
#endif // POSIX |
1524 |
} |
1525 |
|
1526 |
void File::LogAsResized(Chunk* pResizedChunk) { |
1527 |
ResizedChunks.push_back(pResizedChunk); |
1528 |
} |
1529 |
|
1530 |
unsigned long File::GetFileSize() { |
1531 |
return __GetFileSize(hFileRead); |
1532 |
} |
1533 |
|
1534 |
#if POSIX |
1535 |
unsigned long File::__GetFileSize(int hFile) { |
1536 |
struct stat filestat; |
1537 |
fstat(hFile, &filestat); |
1538 |
long size = filestat.st_size; |
1539 |
return size; |
1540 |
} |
1541 |
#else // standard C functions |
1542 |
unsigned long File::__GetFileSize(FILE* hFile) { |
1543 |
long curpos = ftell(hFile); |
1544 |
fseek(hFile, 0, SEEK_END); |
1545 |
long size = ftell(hFile); |
1546 |
fseek(hFile, curpos, SEEK_SET); |
1547 |
return size; |
1548 |
} |
1549 |
#endif |
1550 |
|
1551 |
|
1552 |
// *************** Exception *************** |
1553 |
// * |
1554 |
|
1555 |
void Exception::PrintMessage() { |
1556 |
std::cout << "RIFF::Exception: " << Message << std::endl; |
1557 |
} |
1558 |
|
1559 |
|
1560 |
// *************** functions *************** |
1561 |
// * |
1562 |
|
1563 |
/** |
1564 |
* Returns the name of this C++ library. This is usually "libgig" of |
1565 |
* course. This call is equivalent to DLS::libraryName() and |
1566 |
* gig::libraryName(). |
1567 |
*/ |
1568 |
String libraryName() { |
1569 |
return PACKAGE; |
1570 |
} |
1571 |
|
1572 |
/** |
1573 |
* Returns version of this C++ library. This call is equivalent to |
1574 |
* DLS::libraryVersion() and gig::libraryVersion(). |
1575 |
*/ |
1576 |
String libraryVersion() { |
1577 |
return VERSION; |
1578 |
} |
1579 |
|
1580 |
} // namespace RIFF |