/[svn]/libgig/trunk/src/helper.h
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revision 809 by schoenebeck, Tue Nov 22 11:26:55 2005 UTC revision 929 by schoenebeck, Tue Oct 24 22:24:45 2006 UTC
# Line 2  Line 2 
2   *                                                                         *   *                                                                         *
3   *   libgig - C++ cross-platform Gigasampler format file loader library    *   *   libgig - C++ cross-platform Gigasampler format file loader library    *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003-2005 by Christian Schoenebeck                      *   *   Copyright (C) 2003-2006 by Christian Schoenebeck                      *
6   *                              <cuse@users.sourceforge.net>               *   *                              <cuse@users.sourceforge.net>               *
7   *                                                                         *   *                                                                         *
8   *   This library is free software; you can redistribute it and/or modify  *   *   This library is free software; you can redistribute it and/or modify  *
# Line 28  Line 28 
28  #include <string>  #include <string>
29  #include <sstream>  #include <sstream>
30    
31    #include "RIFF.h"
32    
33  // *************** Helper Functions **************  // *************** Helper Functions **************
34  // *  // *
35    
# Line 102  inline void SwapMemoryArea(void* pData, Line 104  inline void SwapMemoryArea(void* pData,
104      }      }
105  }  }
106    
107    /** @brief Load given info field (string).
108     *
109     * Load info field string from given info chunk (\a ck) and save value to \a s.
110     */
111    inline void LoadString(RIFF::Chunk* ck, std::string& s) {
112        if (ck) {
113            const char* str = (char*)ck->LoadChunkData();
114            int size = ck->GetSize();
115            int len;
116            for (len = 0 ; len < size ; len++)
117                if (str[len] == '\0') break;
118            s.assign(str, len);
119            ck->ReleaseChunkData();
120        }
121    }
122    
123    /** @brief Apply given INFO field to the respective chunk.
124     *
125     * Apply given info value string to given info chunk, which is a
126     * subchunk of INFO list chunk \a lstINFO. If the given chunk already
127     * exists, value \a s will be applied. Otherwise if it doesn't exist yet
128     * and either \a s or \a sDefault is not an empty string, such a chunk
129     * will be created and either \a s or \a sDefault will be applied
130     * (depending on which one is not an empty string, if both are not an
131     * empty string \a s will be preferred).
132     *
133     * @param ChunkID  - 32 bit RIFF chunk ID of INFO subchunk (only used in case \a ck is NULL)
134     * @param ck       - INFO (sub)chunk where string should be stored to
135     * @param lstINFO  - parent (INFO) RIFF list chunk
136     * @param s        - current value of info field
137     * @param sDefault - default value
138     * @param bUseFixedLengthStrings - should a specific string size be forced in the chunk?
139     * @param size     - wanted size of the INFO chunk. This is ignored if bUseFixedLengthStrings is false.
140     */
141    inline void SaveString(uint32_t ChunkID, RIFF::Chunk* ck, RIFF::List* lstINFO, const std::string& s, const std::string& sDefault, bool bUseFixedLengthStrings, int size) {
142        if (ck) { // if chunk exists already, use 's' as value
143            if (!bUseFixedLengthStrings) size = s.size() + 1;
144            ck->Resize(size);
145            char* pData = (char*) ck->LoadChunkData();
146            strncpy(pData, s.c_str(), size);
147        } else if (s != "" || sDefault != "") { // create chunk
148            const std::string& sToSave = (s != "") ? s : sDefault;
149            if (!bUseFixedLengthStrings) size = sToSave.size() + 1;
150            ck = lstINFO->AddSubChunk(ChunkID, size);
151            char* pData = (char*) ck->LoadChunkData();
152            strncpy(pData, sToSave.c_str(), size);
153        }
154    }
155    
156  #endif // __LIBGIG_HELPER_H__  #endif // __LIBGIG_HELPER_H__

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