trunk/src/helper.h

/***************************************************************************
 *                                                                         *
 *   libgig - C++ cross-platform Gigasampler format file access library    *
 *                                                                         *
 *   Copyright (C) 2003-2014 by Christian Schoenebeck                      *
 *                              <cuse@users.sourceforge.net>               *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LIBGIG_HELPER_H__
#define __LIBGIG_HELPER_H__

#include <string.h>
#include <string>
#include <sstream>

#if defined(WIN32) && !HAVE_CONFIG_H
# include "../win32/libgig_private.h" // like config.h, automatically generated by Dev-C++
# define PACKAGE "libgig"
# define VERSION VER_STRING // VER_STRING defined in libgig_private.h
#endif // WIN32

#include "RIFF.h"

// *************** Helper Functions **************
// *

template<class T> inline std::string ToString(T o) {
    std::stringstream ss;
    ss << o;
    return ss.str();
}

inline long Min(long A, long B) {
    return (A > B) ? B : A;
}

inline long Abs(long val) {
    return (val > 0) ? val : -val;
}

inline void swapBytes_16(void* Word) {
    uint8_t byteCache = *((uint8_t*) Word);
    *((uint8_t*) Word)     = *((uint8_t*) Word + 1);
    *((uint8_t*) Word + 1) = byteCache;
}

inline void swapBytes_32(void* Word) {
    uint8_t byteCache = *((uint8_t*) Word);
    *((uint8_t*) Word)     = *((uint8_t*) Word + 3);
    *((uint8_t*) Word + 3) = byteCache;
    byteCache = *((uint8_t*) Word + 1);
    *((uint8_t*) Word + 1) = *((uint8_t*) Word + 2);
    *((uint8_t*) Word + 2) = byteCache;
}

inline void swapBytes_64(void* Word) {
    uint8_t byteCache = ((uint8_t*)Word)[0];
    ((uint8_t*)Word)[0] = ((uint8_t*)Word)[7];
    ((uint8_t*)Word)[7] = byteCache;
    byteCache = ((uint8_t*)Word)[1];
    ((uint8_t*)Word)[1] = ((uint8_t*)Word)[6];
    ((uint8_t*)Word)[6] = byteCache;
    byteCache = ((uint8_t*)Word)[2];
    ((uint8_t*)Word)[2] = ((uint8_t*)Word)[5];
    ((uint8_t*)Word)[5] = byteCache;
    byteCache = ((uint8_t*)Word)[3];
    ((uint8_t*)Word)[3] = ((uint8_t*)Word)[4];
    ((uint8_t*)Word)[4] = byteCache;
}

inline void swapBytes(void* Word, uint64_t WordSize) {
    uint8_t byteCache;
    uint64_t lo = 0, hi = WordSize - 1;
    for (; lo < hi; hi--, lo++) {
        byteCache = *((uint8_t*) Word + lo);
        *((uint8_t*) Word + lo) = *((uint8_t*) Word + hi);
        *((uint8_t*) Word + hi) = byteCache;
    }
}

/**
 * Stores a 16 bit integer in memory using little-endian format.
 *
 * @param pData - memory pointer
 * @param data  - integer to be stored
 */
inline void store16(uint8_t* pData, uint16_t data) {
    pData[0] = data;
    pData[1] = data >> 8;
}

/**
 * Stores a 32 bit integer in memory using little-endian format.
 *
 * @param pData - memory pointer
 * @param data  - integer to be stored
 */
inline void store32(uint8_t* pData, uint32_t data) {
    pData[0] = data;
    pData[1] = data >> 8;
    pData[2] = data >> 16;
    pData[3] = data >> 24;
}

/**
 * Loads a 32 bit integer in memory using little-endian format.
 *
 * @param pData - memory pointer
 * @returns 32 bit data word
 */
inline uint32_t load32(uint8_t* pData) {
    return uint32_t(pData[0])       |
           uint32_t(pData[1]) << 8  |
           uint32_t(pData[2]) << 16 |
           uint32_t(pData[3]) << 24;
}

/**
 * Swaps the order of the data words in the given memory area
 * with a granularity given by \a WordSize.
 *
 * @param pData    - pointer to the memory area to be swapped
 * @param AreaSize - size of the memory area to be swapped (in bytes)
 * @param WordSize - size of the data words (in bytes)
 */
inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
    if (!AreaSize) return; // AreaSize==0 would cause a segfault here
    switch (WordSize) { // TODO: unefficient
        case 1: {
            uint8_t* pDst = (uint8_t*) pData;
            uint8_t  cache;
            unsigned long lo = 0, hi = AreaSize - 1;
            for (; lo < hi; hi--, lo++) {
                cache    = pDst[lo];
                pDst[lo] = pDst[hi];
                pDst[hi] = cache;
            }
            break;
        }
        case 2: {
            uint16_t* pDst = (uint16_t*) pData;
            uint16_t  cache;
            unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
            for (; lo < hi; hi--, lo++) {
                cache    = pDst[lo];
                pDst[lo] = pDst[hi];
                pDst[hi] = cache;
            }
            break;
        }
        case 4: {
            uint32_t* pDst = (uint32_t*) pData;
            uint32_t  cache;
            unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
            for (; lo < hi; hi--, lo++) {
                cache    = pDst[lo];
                pDst[lo] = pDst[hi];
                pDst[hi] = cache;
            }
            break;
        }
        default: {
            uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
            unsigned long lo = 0, hi = AreaSize - WordSize;
            for (; lo < hi; hi -= WordSize, lo += WordSize) {
                memcpy(pCache, (uint8_t*) pData + lo, WordSize);
                memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
                memcpy((uint8_t*) pData + hi, pCache, WordSize);
            }
            if (pCache) delete[] pCache;
            break;
        }
    }
}

/** @brief Load given info field (string).
 *
 * Load info field string from given info chunk (\a ck) and save value to \a s.
 */
inline void LoadString(RIFF::Chunk* ck, std::string& s) {
    if (ck) {
        const char* str = (char*)ck->LoadChunkData();
        int size = ck->GetSize();
        int len;
        for (len = 0 ; len < size ; len++)
            if (str[len] == '\0') break;
        s.assign(str, len);
        ck->ReleaseChunkData();
    }
}

/** @brief Apply given INFO field to the respective chunk.
 *
 * Apply given info value string to given info chunk, which is a
 * subchunk of INFO list chunk \a lstINFO. If the given chunk already
 * exists, value \a s will be applied. Otherwise if it doesn't exist yet
 * and either \a s or \a sDefault is not an empty string, such a chunk
 * will be created and either \a s or \a sDefault will be applied
 * (depending on which one is not an empty string, if both are not an
 * empty string \a s will be preferred).
 *
 * @param ChunkID  - 32 bit RIFF chunk ID of INFO subchunk (only used in case \a ck is NULL)
 * @param ck       - INFO (sub)chunk where string should be stored to
 * @param lstINFO  - parent (INFO) RIFF list chunk
 * @param s        - current value of info field
 * @param sDefault - default value
 * @param bUseFixedLengthStrings - should a specific string size be forced in the chunk?
 * @param size     - wanted size of the INFO chunk. This is ignored if bUseFixedLengthStrings is false.
 */
inline void SaveString(uint32_t ChunkID, RIFF::Chunk* ck, RIFF::List* lstINFO, const std::string& s, const std::string& sDefault, bool bUseFixedLengthStrings, int size) {
    if (ck) { // if chunk exists already, use 's' as value
        if (!bUseFixedLengthStrings) size = s.size() + 1;
        ck->Resize(size);
        char* pData = (char*) ck->LoadChunkData();
        strncpy(pData, s.c_str(), size);
    } else if (s != "" || sDefault != "" || bUseFixedLengthStrings) { // create chunk
        const std::string& sToSave = (s != "") ? s : sDefault;
        if (!bUseFixedLengthStrings) size = sToSave.size() + 1;
        ck = lstINFO->AddSubChunk(ChunkID, size);
        char* pData = (char*) ck->LoadChunkData();
        strncpy(pData, sToSave.c_str(), size);
    }
}

// private helper function to convert progress of a subprocess into the global progress
inline void __notify_progress(RIFF::progress_t* pProgress, float subprogress) {
    if (pProgress && pProgress->callback) {
        const float totalrange    = pProgress->__range_max - pProgress->__range_min;
        const float totalprogress = pProgress->__range_min + subprogress * totalrange;
        pProgress->factor         = totalprogress;
        pProgress->callback(pProgress); // now actually notify about the progress
    }
}

// private helper function to divide a progress into subprogresses
inline void __divide_progress(RIFF::progress_t* pParentProgress, RIFF::progress_t* pSubProgress, float totalTasks, float currentTask) {
    if (pParentProgress && pParentProgress->callback) {
        const float totalrange    = pParentProgress->__range_max - pParentProgress->__range_min;
        pSubProgress->callback    = pParentProgress->callback;
        pSubProgress->custom      = pParentProgress->custom;
        pSubProgress->__range_min = pParentProgress->__range_min + totalrange * currentTask / totalTasks;
        pSubProgress->__range_max = pSubProgress->__range_min + totalrange / totalTasks;
    }
}

#endif // __LIBGIG_HELPER_H__
1	schoenebeck	803	/***************************************************************************
2			* *
3	schoenebeck	933	* libgig - C++ cross-platform Gigasampler format file access library *
4	schoenebeck	803	* *
5	schoenebeck	2682	* Copyright (C) 2003-2014 by Christian Schoenebeck *
6	schoenebeck	803	* <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	persson	1330	#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	schoenebeck	929	#include "RIFF.h"
38
39	schoenebeck	803	// ************* Helper Functions ************
40			// *
41
42			template<class T> inline std::string ToString(T o) {
43			std::stringstream ss;
44			ss << o;
45			return ss.str();
46			}
47
48	schoenebeck	809	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	schoenebeck	2912	inline void swapBytes_16(void* Word) {
57			uint8_t byteCache = ((uint8_t) Word);
58			((uint8_t) Word) = ((uint8_t) Word + 1);
59			((uint8_t) Word + 1) = byteCache;
60			}
61
62			inline void swapBytes_32(void* Word) {
63			uint8_t byteCache = ((uint8_t) Word);
64			((uint8_t) Word) = ((uint8_t) Word + 3);
65			((uint8_t) Word + 3) = byteCache;
66			byteCache = ((uint8_t) Word + 1);
67			((uint8_t) Word + 1) = ((uint8_t) Word + 2);
68			((uint8_t) Word + 2) = byteCache;
69			}
70
71			inline void swapBytes_64(void* Word) {
72			uint8_t byteCache = ((uint8_t*)Word)[0];
73			((uint8_t)Word)[0] = ((uint8_t)Word)[7];
74			((uint8_t*)Word)[7] = byteCache;
75			byteCache = ((uint8_t*)Word)[1];
76			((uint8_t)Word)[1] = ((uint8_t)Word)[6];
77			((uint8_t*)Word)[6] = byteCache;
78			byteCache = ((uint8_t*)Word)[2];
79			((uint8_t)Word)[2] = ((uint8_t)Word)[5];
80			((uint8_t*)Word)[5] = byteCache;
81			byteCache = ((uint8_t*)Word)[3];
82			((uint8_t)Word)[3] = ((uint8_t)Word)[4];
83			((uint8_t*)Word)[4] = byteCache;
84			}
85
86			inline void swapBytes(void* Word, uint64_t WordSize) {
87			uint8_t byteCache;
88			uint64_t lo = 0, hi = WordSize - 1;
89			for (; lo < hi; hi--, lo++) {
90			byteCache = ((uint8_t) Word + lo);
91			((uint8_t) Word + lo) = ((uint8_t) Word + hi);
92			((uint8_t) Word + hi) = byteCache;
93			}
94			}
95
96	schoenebeck	809	/**
97	persson	1179	* Stores a 16 bit integer in memory using little-endian format.
98			*
99			* @param pData - memory pointer
100			* @param data - integer to be stored
101			*/
102			inline void store16(uint8_t* pData, uint16_t data) {
103			pData[0] = data;
104			pData[1] = data >> 8;
105			}
106
107			/**
108			* Stores a 32 bit integer in memory using little-endian format.
109			*
110			* @param pData - memory pointer
111			* @param data - integer to be stored
112			*/
113			inline void store32(uint8_t* pData, uint32_t data) {
114			pData[0] = data;
115			pData[1] = data >> 8;
116			pData[2] = data >> 16;
117			pData[3] = data >> 24;
118			}
119
120			/**
121	schoenebeck	2912	* Loads a 32 bit integer in memory using little-endian format.
122			*
123			* @param pData - memory pointer
124			* @returns 32 bit data word
125			*/
126			inline uint32_t load32(uint8_t* pData) {
127			return uint32_t(pData[0]) \|
128			uint32_t(pData[1]) << 8 \|
129			uint32_t(pData[2]) << 16 \|
130			uint32_t(pData[3]) << 24;
131			}
132
133			/**
134	schoenebeck	809	* Swaps the order of the data words in the given memory area
135			* with a granularity given by \a WordSize.
136			*
137			* @param pData - pointer to the memory area to be swapped
138			* @param AreaSize - size of the memory area to be swapped (in bytes)
139			* @param WordSize - size of the data words (in bytes)
140			*/
141			inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
142	schoenebeck	1875	if (!AreaSize) return; // AreaSize==0 would cause a segfault here
143	schoenebeck	809	switch (WordSize) { // TODO: unefficient
144			case 1: {
145			uint8_t* pDst = (uint8_t*) pData;
146			uint8_t cache;
147			unsigned long lo = 0, hi = AreaSize - 1;
148			for (; lo < hi; hi--, lo++) {
149			cache = pDst[lo];
150			pDst[lo] = pDst[hi];
151			pDst[hi] = cache;
152			}
153			break;
154			}
155			case 2: {
156			uint16_t* pDst = (uint16_t*) pData;
157			uint16_t cache;
158			unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
159			for (; lo < hi; hi--, lo++) {
160			cache = pDst[lo];
161			pDst[lo] = pDst[hi];
162			pDst[hi] = cache;
163			}
164			break;
165			}
166			case 4: {
167			uint32_t* pDst = (uint32_t*) pData;
168			uint32_t cache;
169			unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
170			for (; lo < hi; hi--, lo++) {
171			cache = pDst[lo];
172			pDst[lo] = pDst[hi];
173			pDst[hi] = cache;
174			}
175			break;
176			}
177			default: {
178			uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
179			unsigned long lo = 0, hi = AreaSize - WordSize;
180			for (; lo < hi; hi -= WordSize, lo += WordSize) {
181			memcpy(pCache, (uint8_t*) pData + lo, WordSize);
182			memcpy((uint8_t) pData + lo, (uint8_t) pData + hi, WordSize);
183			memcpy((uint8_t*) pData + hi, pCache, WordSize);
184			}
185	schoenebeck	1875	if (pCache) delete[] pCache;
186	schoenebeck	809	break;
187			}
188			}
189			}
190
191	schoenebeck	929	/** @brief Load given info field (string).
192			*
193			* Load info field string from given info chunk (\a ck) and save value to \a s.
194			*/
195			inline void LoadString(RIFF::Chunk* ck, std::string& s) {
196			if (ck) {
197			const char* str = (char*)ck->LoadChunkData();
198			int size = ck->GetSize();
199			int len;
200			for (len = 0 ; len < size ; len++)
201			if (str[len] == '\0') break;
202			s.assign(str, len);
203			ck->ReleaseChunkData();
204			}
205			}
206
207			/** @brief Apply given INFO field to the respective chunk.
208			*
209			* Apply given info value string to given info chunk, which is a
210			* subchunk of INFO list chunk \a lstINFO. If the given chunk already
211			* exists, value \a s will be applied. Otherwise if it doesn't exist yet
212			* and either \a s or \a sDefault is not an empty string, such a chunk
213			* will be created and either \a s or \a sDefault will be applied
214			* (depending on which one is not an empty string, if both are not an
215			* empty string \a s will be preferred).
216			*
217			* @param ChunkID - 32 bit RIFF chunk ID of INFO subchunk (only used in case \a ck is NULL)
218			* @param ck - INFO (sub)chunk where string should be stored to
219			* @param lstINFO - parent (INFO) RIFF list chunk
220			* @param s - current value of info field
221			* @param sDefault - default value
222			* @param bUseFixedLengthStrings - should a specific string size be forced in the chunk?
223			* @param size - wanted size of the INFO chunk. This is ignored if bUseFixedLengthStrings is false.
224			*/
225			inline void SaveString(uint32_t ChunkID, RIFF::Chunk* ck, RIFF::List* lstINFO, const std::string& s, const std::string& sDefault, bool bUseFixedLengthStrings, int size) {
226			if (ck) { // if chunk exists already, use 's' as value
227			if (!bUseFixedLengthStrings) size = s.size() + 1;
228			ck->Resize(size);
229			char* pData = (char*) ck->LoadChunkData();
230			strncpy(pData, s.c_str(), size);
231	persson	1180	} else if (s != "" \|\| sDefault != "" \|\| bUseFixedLengthStrings) { // create chunk
232	schoenebeck	929	const std::string& sToSave = (s != "") ? s : sDefault;
233			if (!bUseFixedLengthStrings) size = sToSave.size() + 1;
234			ck = lstINFO->AddSubChunk(ChunkID, size);
235			char* pData = (char*) ck->LoadChunkData();
236			strncpy(pData, sToSave.c_str(), size);
237			}
238			}
239
240	schoenebeck	2682	// private helper function to convert progress of a subprocess into the global progress
241			inline void __notify_progress(RIFF::progress_t* pProgress, float subprogress) {
242			if (pProgress && pProgress->callback) {
243			const float totalrange = pProgress->__range_max - pProgress->__range_min;
244			const float totalprogress = pProgress->__range_min + subprogress * totalrange;
245			pProgress->factor = totalprogress;
246			pProgress->callback(pProgress); // now actually notify about the progress
247			}
248			}
249
250			// private helper function to divide a progress into subprogresses
251			inline void __divide_progress(RIFF::progress_t* pParentProgress, RIFF::progress_t* pSubProgress, float totalTasks, float currentTask) {
252			if (pParentProgress && pParentProgress->callback) {
253			const float totalrange = pParentProgress->__range_max - pParentProgress->__range_min;
254			pSubProgress->callback = pParentProgress->callback;
255			pSubProgress->custom = pParentProgress->custom;
256			pSubProgress->__range_min = pParentProgress->__range_min + totalrange * currentTask / totalTasks;
257			pSubProgress->__range_max = pSubProgress->__range_min + totalrange / totalTasks;
258			}
259			}
260
261	schoenebeck	803	#endif // __LIBGIG_HELPER_H__