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

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Revision 929 - (show annotations) (download) (as text)
Tue Oct 24 22:24:45 2006 UTC (16 years, 3 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 6360 byte(s)
* support for Gigasampler's sample groups added

1 /***************************************************************************
2 * *
3 * libgig - C++ cross-platform Gigasampler format file loader library *
4 * *
5 * Copyright (C) 2003-2006 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 #include <string.h>
28 #include <string>
29 #include <sstream>
30
31 #include "RIFF.h"
32
33 // *************** Helper Functions **************
34 // *
35
36 template<class T> inline std::string ToString(T o) {
37 std::stringstream ss;
38 ss << o;
39 return ss.str();
40 }
41
42 inline long Min(long A, long B) {
43 return (A > B) ? B : A;
44 }
45
46 inline long Abs(long val) {
47 return (val > 0) ? val : -val;
48 }
49
50 /**
51 * Swaps the order of the data words in the given memory area
52 * with a granularity given by \a WordSize.
53 *
54 * @param pData - pointer to the memory area to be swapped
55 * @param AreaSize - size of the memory area to be swapped (in bytes)
56 * @param WordSize - size of the data words (in bytes)
57 */
58 inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
59 switch (WordSize) { // TODO: unefficient
60 case 1: {
61 uint8_t* pDst = (uint8_t*) pData;
62 uint8_t cache;
63 unsigned long lo = 0, hi = AreaSize - 1;
64 for (; lo < hi; hi--, lo++) {
65 cache = pDst[lo];
66 pDst[lo] = pDst[hi];
67 pDst[hi] = cache;
68 }
69 break;
70 }
71 case 2: {
72 uint16_t* pDst = (uint16_t*) pData;
73 uint16_t cache;
74 unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
75 for (; lo < hi; hi--, lo++) {
76 cache = pDst[lo];
77 pDst[lo] = pDst[hi];
78 pDst[hi] = cache;
79 }
80 break;
81 }
82 case 4: {
83 uint32_t* pDst = (uint32_t*) pData;
84 uint32_t cache;
85 unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
86 for (; lo < hi; hi--, lo++) {
87 cache = pDst[lo];
88 pDst[lo] = pDst[hi];
89 pDst[hi] = cache;
90 }
91 break;
92 }
93 default: {
94 uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
95 unsigned long lo = 0, hi = AreaSize - WordSize;
96 for (; lo < hi; hi -= WordSize, lo += WordSize) {
97 memcpy(pCache, (uint8_t*) pData + lo, WordSize);
98 memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
99 memcpy((uint8_t*) pData + hi, pCache, WordSize);
100 }
101 delete[] pCache;
102 break;
103 }
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__

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