/[svn]/libgig/trunk/src/helper.h
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Annotation of /libgig/trunk/src/helper.h

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Revision 809 - (hide annotations) (download) (as text)
Tue Nov 22 11:26:55 2005 UTC (17 years, 2 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 4115 byte(s)
* src/gig.cpp, src/gig.h:
  - added write support (highly experimental)
  - removed unnecessary definitions from header file
* src/DLS.cpp:
  - try to load instruments/samples before adding a new instrument/sample

1 schoenebeck 803 /***************************************************************************
2     * *
3     * libgig - C++ cross-platform Gigasampler format file loader library *
4     * *
5     * Copyright (C) 2003-2005 by Christian Schoenebeck *
6     * <cuse@users.sourceforge.net> *
7     * *
8     * This library is free software; you can redistribute it and/or modify *
9     * it under the terms of the GNU General Public License as published by *
10     * the Free Software Foundation; either version 2 of the License, or *
11     * (at your option) any later version. *
12     * *
13     * This library is distributed in the hope that it will be useful, *
14     * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16     * GNU General Public License for more details. *
17     * *
18     * You should have received a copy of the GNU General Public License *
19     * along with this library; if not, write to the Free Software *
20     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21     * MA 02111-1307 USA *
22     ***************************************************************************/
23    
24     #ifndef __LIBGIG_HELPER_H__
25     #define __LIBGIG_HELPER_H__
26    
27 schoenebeck 809 #include <string.h>
28 schoenebeck 803 #include <string>
29     #include <sstream>
30    
31     // *************** Helper Functions **************
32     // *
33    
34     template<class T> inline std::string ToString(T o) {
35     std::stringstream ss;
36     ss << o;
37     return ss.str();
38     }
39    
40 schoenebeck 809 inline long Min(long A, long B) {
41     return (A > B) ? B : A;
42     }
43    
44     inline long Abs(long val) {
45     return (val > 0) ? val : -val;
46     }
47    
48     /**
49     * Swaps the order of the data words in the given memory area
50     * with a granularity given by \a WordSize.
51     *
52     * @param pData - pointer to the memory area to be swapped
53     * @param AreaSize - size of the memory area to be swapped (in bytes)
54     * @param WordSize - size of the data words (in bytes)
55     */
56     inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
57     switch (WordSize) { // TODO: unefficient
58     case 1: {
59     uint8_t* pDst = (uint8_t*) pData;
60     uint8_t cache;
61     unsigned long lo = 0, hi = AreaSize - 1;
62     for (; lo < hi; hi--, lo++) {
63     cache = pDst[lo];
64     pDst[lo] = pDst[hi];
65     pDst[hi] = cache;
66     }
67     break;
68     }
69     case 2: {
70     uint16_t* pDst = (uint16_t*) pData;
71     uint16_t cache;
72     unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
73     for (; lo < hi; hi--, lo++) {
74     cache = pDst[lo];
75     pDst[lo] = pDst[hi];
76     pDst[hi] = cache;
77     }
78     break;
79     }
80     case 4: {
81     uint32_t* pDst = (uint32_t*) pData;
82     uint32_t cache;
83     unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
84     for (; lo < hi; hi--, lo++) {
85     cache = pDst[lo];
86     pDst[lo] = pDst[hi];
87     pDst[hi] = cache;
88     }
89     break;
90     }
91     default: {
92     uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
93     unsigned long lo = 0, hi = AreaSize - WordSize;
94     for (; lo < hi; hi -= WordSize, lo += WordSize) {
95     memcpy(pCache, (uint8_t*) pData + lo, WordSize);
96     memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
97     memcpy((uint8_t*) pData + hi, pCache, WordSize);
98     }
99     delete[] pCache;
100     break;
101     }
102     }
103     }
104    
105 schoenebeck 803 #endif // __LIBGIG_HELPER_H__

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