/[svn]/libgig/trunk/src/helper.h
ViewVC logotype

Diff of /libgig/trunk/src/helper.h

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 809 by schoenebeck, Tue Nov 22 11:26:55 2005 UTC revision 1875 by schoenebeck, Thu Mar 26 13:32:59 2009 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) 2003-2009 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 54  inline long Abs(long val) { Line 86  inline long Abs(long val) {
86   * @param WordSize - size of the data words (in bytes)   * @param WordSize - size of the data words (in bytes)
87   */   */
88  inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {  inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
89        if (!AreaSize) return; // AreaSize==0 would cause a segfault here
90      switch (WordSize) { // TODO: unefficient      switch (WordSize) { // TODO: unefficient
91          case 1: {          case 1: {
92              uint8_t* pDst = (uint8_t*) pData;              uint8_t* pDst = (uint8_t*) pData;
# Line 96  inline void SwapMemoryArea(void* pData, Line 129  inline void SwapMemoryArea(void* pData,
129                  memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);                  memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
130                  memcpy((uint8_t*) pData + hi, pCache, WordSize);                  memcpy((uint8_t*) pData + hi, pCache, WordSize);
131              }              }
132              delete[] pCache;              if (pCache) delete[] pCache;
133              break;              break;
134          }          }
135      }      }
136  }  }
137    
138    /** @brief Load given info field (string).
139     *
140     * Load info field string from given info chunk (\a ck) and save value to \a s.
141     */
142    inline void LoadString(RIFF::Chunk* ck, std::string& s) {
143        if (ck) {
144            const char* str = (char*)ck->LoadChunkData();
145            int size = ck->GetSize();
146            int len;
147            for (len = 0 ; len < size ; len++)
148                if (str[len] == '\0') break;
149            s.assign(str, len);
150            ck->ReleaseChunkData();
151        }
152    }
153    
154    /** @brief Apply given INFO field to the respective chunk.
155     *
156     * Apply given info value string to given info chunk, which is a
157     * subchunk of INFO list chunk \a lstINFO. If the given chunk already
158     * exists, value \a s will be applied. Otherwise if it doesn't exist yet
159     * and either \a s or \a sDefault is not an empty string, such a chunk
160     * will be created and either \a s or \a sDefault will be applied
161     * (depending on which one is not an empty string, if both are not an
162     * empty string \a s will be preferred).
163     *
164     * @param ChunkID  - 32 bit RIFF chunk ID of INFO subchunk (only used in case \a ck is NULL)
165     * @param ck       - INFO (sub)chunk where string should be stored to
166     * @param lstINFO  - parent (INFO) RIFF list chunk
167     * @param s        - current value of info field
168     * @param sDefault - default value
169     * @param bUseFixedLengthStrings - should a specific string size be forced in the chunk?
170     * @param size     - wanted size of the INFO chunk. This is ignored if bUseFixedLengthStrings is false.
171     */
172    inline void SaveString(uint32_t ChunkID, RIFF::Chunk* ck, RIFF::List* lstINFO, const std::string& s, const std::string& sDefault, bool bUseFixedLengthStrings, int size) {
173        if (ck) { // if chunk exists already, use 's' as value
174            if (!bUseFixedLengthStrings) size = s.size() + 1;
175            ck->Resize(size);
176            char* pData = (char*) ck->LoadChunkData();
177            strncpy(pData, s.c_str(), size);
178        } else if (s != "" || sDefault != "" || bUseFixedLengthStrings) { // create chunk
179            const std::string& sToSave = (s != "") ? s : sDefault;
180            if (!bUseFixedLengthStrings) size = sToSave.size() + 1;
181            ck = lstINFO->AddSubChunk(ChunkID, size);
182            char* pData = (char*) ck->LoadChunkData();
183            strncpy(pData, sToSave.c_str(), size);
184        }
185    }
186    
187  #endif // __LIBGIG_HELPER_H__  #endif // __LIBGIG_HELPER_H__
Legend:
Removed from v.809  
changed lines
  Added in v.1875
  ViewVC Help
Powered by ViewVC