/[svn]/libgig/trunk/src/helper.h
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revision 809 by schoenebeck, Tue Nov 22 11:26:55 2005 UTC revision 1330 by persson, Sun Sep 9 10:36:23 2007 UTC
# Line 1  Line 1 
1  /***************************************************************************  /***************************************************************************
2   *                                                                         *   *                                                                         *
3   *   libgig - C++ cross-platform Gigasampler format file loader library    *   *   libgig - C++ cross-platform Gigasampler format file access 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    #if defined(WIN32) && !HAVE_CONFIG_H
32    # include "../win32/libgig_private.h" // like config.h, automatically generated by Dev-C++
33    # define PACKAGE "libgig"
34    # define VERSION VER_STRING // VER_STRING defined in libgig_private.h
35    #endif // WIN32
36    
37    #include "RIFF.h"
38    
39  // *************** Helper Functions **************  // *************** Helper Functions **************
40  // *  // *
41    
# Line 46  inline long Abs(long val) { Line 54  inline long Abs(long val) {
54  }  }
55    
56  /**  /**
57     * Stores a 16 bit integer in memory using little-endian format.
58     *
59     * @param pData - memory pointer
60     * @param data  - integer to be stored
61     */
62    inline void store16(uint8_t* pData, uint16_t data) {
63        pData[0] = data;
64        pData[1] = data >> 8;
65    }
66    
67    /**
68     * Stores a 32 bit integer in memory using little-endian format.
69     *
70     * @param pData - memory pointer
71     * @param data  - integer to be stored
72     */
73    inline void store32(uint8_t* pData, uint32_t data) {
74        pData[0] = data;
75        pData[1] = data >> 8;
76        pData[2] = data >> 16;
77        pData[3] = data >> 24;
78    }
79    
80    /**
81   * Swaps the order of the data words in the given memory area   * Swaps the order of the data words in the given memory area
82   * with a granularity given by \a WordSize.   * with a granularity given by \a WordSize.
83   *   *
# Line 102  inline void SwapMemoryArea(void* pData, Line 134  inline void SwapMemoryArea(void* pData,
134      }      }
135  }  }
136    
137    /** @brief Load given info field (string).
138     *
139     * Load info field string from given info chunk (\a ck) and save value to \a s.
140     */
141    inline void LoadString(RIFF::Chunk* ck, std::string& s) {
142        if (ck) {
143            const char* str = (char*)ck->LoadChunkData();
144            int size = ck->GetSize();
145            int len;
146            for (len = 0 ; len < size ; len++)
147                if (str[len] == '\0') break;
148            s.assign(str, len);
149            ck->ReleaseChunkData();
150        }
151    }
152    
153    /** @brief Apply given INFO field to the respective chunk.
154     *
155     * Apply given info value string to given info chunk, which is a
156     * subchunk of INFO list chunk \a lstINFO. If the given chunk already
157     * exists, value \a s will be applied. Otherwise if it doesn't exist yet
158     * and either \a s or \a sDefault is not an empty string, such a chunk
159     * will be created and either \a s or \a sDefault will be applied
160     * (depending on which one is not an empty string, if both are not an
161     * empty string \a s will be preferred).
162     *
163     * @param ChunkID  - 32 bit RIFF chunk ID of INFO subchunk (only used in case \a ck is NULL)
164     * @param ck       - INFO (sub)chunk where string should be stored to
165     * @param lstINFO  - parent (INFO) RIFF list chunk
166     * @param s        - current value of info field
167     * @param sDefault - default value
168     * @param bUseFixedLengthStrings - should a specific string size be forced in the chunk?
169     * @param size     - wanted size of the INFO chunk. This is ignored if bUseFixedLengthStrings is false.
170     */
171    inline void SaveString(uint32_t ChunkID, RIFF::Chunk* ck, RIFF::List* lstINFO, const std::string& s, const std::string& sDefault, bool bUseFixedLengthStrings, int size) {
172        if (ck) { // if chunk exists already, use 's' as value
173            if (!bUseFixedLengthStrings) size = s.size() + 1;
174            ck->Resize(size);
175            char* pData = (char*) ck->LoadChunkData();
176            strncpy(pData, s.c_str(), size);
177        } else if (s != "" || sDefault != "" || bUseFixedLengthStrings) { // create chunk
178            const std::string& sToSave = (s != "") ? s : sDefault;
179            if (!bUseFixedLengthStrings) size = sToSave.size() + 1;
180            ck = lstINFO->AddSubChunk(ChunkID, size);
181            char* pData = (char*) ck->LoadChunkData();
182            strncpy(pData, sToSave.c_str(), size);
183        }
184    }
185    
186  #endif // __LIBGIG_HELPER_H__  #endif // __LIBGIG_HELPER_H__
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