/[svn]/libgig/trunk/src/helper.h
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revision 803 by schoenebeck, Sat Nov 12 12:36:49 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 24  Line 24 
24  #ifndef __LIBGIG_HELPER_H__  #ifndef __LIBGIG_HELPER_H__
25  #define __LIBGIG_HELPER_H__  #define __LIBGIG_HELPER_H__
26    
27    #include <string.h>
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 36  template<class T> inline std::string ToS Line 45  template<class T> inline std::string ToS
45      return ss.str();      return ss.str();
46  }  }
47    
48    inline long Min(long A, long B) {
49        return (A > B) ? B : A;
50    }
51    
52    inline long Abs(long val) {
53        return (val > 0) ? val : -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
82     * with a granularity given by \a WordSize.
83     *
84     * @param pData    - pointer to the memory area to be swapped
85     * @param AreaSize - size of the memory area to be swapped (in bytes)
86     * @param WordSize - size of the data words (in bytes)
87     */
88    inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
89        switch (WordSize) { // TODO: unefficient
90            case 1: {
91                uint8_t* pDst = (uint8_t*) pData;
92                uint8_t  cache;
93                unsigned long lo = 0, hi = AreaSize - 1;
94                for (; lo < hi; hi--, lo++) {
95                    cache    = pDst[lo];
96                    pDst[lo] = pDst[hi];
97                    pDst[hi] = cache;
98                }
99                break;
100            }
101            case 2: {
102                uint16_t* pDst = (uint16_t*) pData;
103                uint16_t  cache;
104                unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
105                for (; lo < hi; hi--, lo++) {
106                    cache    = pDst[lo];
107                    pDst[lo] = pDst[hi];
108                    pDst[hi] = cache;
109                }
110                break;
111            }
112            case 4: {
113                uint32_t* pDst = (uint32_t*) pData;
114                uint32_t  cache;
115                unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
116                for (; lo < hi; hi--, lo++) {
117                    cache    = pDst[lo];
118                    pDst[lo] = pDst[hi];
119                    pDst[hi] = cache;
120                }
121                break;
122            }
123            default: {
124                uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
125                unsigned long lo = 0, hi = AreaSize - WordSize;
126                for (; lo < hi; hi -= WordSize, lo += WordSize) {
127                    memcpy(pCache, (uint8_t*) pData + lo, WordSize);
128                    memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
129                    memcpy((uint8_t*) pData + hi, pCache, WordSize);
130                }
131                delete[] pCache;
132                break;
133            }
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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