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

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Revision 780 - (show annotations) (download) (as text)
Sun Sep 25 13:40:37 2005 UTC (14 years, 8 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 12144 byte(s)
* added write support (only to the RIFF classes yet)

1 /***************************************************************************
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 __RIFF_H__
25 #define __RIFF_H__
26
27 #define POSIX 1
28 #define DEBUG 0
29
30 #include <string>
31 #include <list>
32 #include <map>
33 #include <iostream>
34
35 #ifdef HAVE_CONFIG_H
36 # include <config.h>
37 #endif
38
39 #if POSIX
40 # include <sys/types.h>
41 # include <sys/stat.h>
42 # include <fcntl.h>
43 # include <unistd.h>
44 #endif // POSIX
45
46 #include <stdint.h>
47
48 //typedef unsigned char uint8_t;
49 //typedef unsigned short uint16_t;
50 //typedef unsigned int uint32_t;
51
52 #include <stdio.h>
53
54 #if WORDS_BIGENDIAN
55 # define CHUNK_ID_RIFF 0x52494646
56 # define CHUNK_ID_RIFX 0x52494658
57 # define CHUNK_ID_LIST 0x4C495354
58 #else // little endian
59 # define CHUNK_ID_RIFF 0x46464952
60 # define CHUNK_ID_RIFX 0x58464952
61 # define CHUNK_ID_LIST 0x5453494C
62 #endif // WORDS_BIGENDIAN
63
64 #define CHUNK_HEADER_SIZE 8
65 #define LIST_HEADER_SIZE 12
66 #define RIFF_HEADER_SIZE 12
67
68
69 /** RIFF specific classes and definitions */
70 namespace RIFF {
71
72 /* just symbol prototyping */
73 class Chunk;
74 class List;
75 class File;
76
77 typedef std::string String;
78
79 /** Whether file stream is open in read or in read/write mode. */
80 typedef enum {
81 stream_mode_read,
82 stream_mode_read_write
83 } stream_mode_t;
84
85 /** Current state of the file stream. */
86 typedef enum {
87 stream_ready = 0,
88 stream_end_reached = 1,
89 stream_closed = 2
90 } stream_state_t;
91
92 /** File stream position dependent to these relations. */
93 typedef enum {
94 stream_start = 0,
95 stream_curpos = 1,
96 stream_backward = 2,
97 stream_end = 3
98 } stream_whence_t;
99
100 /** Provides convenient methods to access data of RIFF chunks in general. */
101 class Chunk {
102 public:
103 Chunk(File* pFile, unsigned long StartPos, List* Parent);
104 String GetChunkIDString();
105 uint32_t GetChunkID() { return ChunkID; }; ///< Chunk ID in unsigned integer representation.
106 List* GetParent() { return pParent; }; ///< Returns pointer to the chunk's parent list chunk.
107 unsigned long GetSize() { return CurrentChunkSize; }; ///< Chunk size in bytes (without header, thus the chunk data body)
108 unsigned long GetNewSize() { return NewChunkSize; }; ///< New chunk size if it was modified with Resize().
109 unsigned long GetPos() { return ulPos; }; ///< Position within the chunk data body
110 unsigned long GetFilePos() { return ulStartPos + ulPos; }; ///< Current, actual offset in file.
111 unsigned long SetPos(unsigned long Where, stream_whence_t Whence = stream_start);
112 unsigned long RemainingBytes();
113 stream_state_t GetState();
114 unsigned long Read(void* pData, unsigned long WordCount, unsigned long WordSize);
115 unsigned long ReadInt8(int8_t* pData, unsigned long WordCount = 1);
116 unsigned long ReadUint8(uint8_t* pData, unsigned long WordCount = 1);
117 unsigned long ReadInt16(int16_t* pData, unsigned long WordCount = 1);
118 unsigned long ReadUint16(uint16_t* pData, unsigned long WordCount = 1);
119 unsigned long ReadInt32(int32_t* pData, unsigned long WordCount = 1);
120 unsigned long ReadUint32(uint32_t* pData, unsigned long WordCount = 1);
121 int8_t ReadInt8();
122 uint8_t ReadUint8();
123 int16_t ReadInt16();
124 uint16_t ReadUint16();
125 int32_t ReadInt32();
126 uint32_t ReadUint32();
127 unsigned long Write(void* pData, unsigned long WordCount, unsigned long WordSize);
128 unsigned long WriteInt8(int8_t* pData, unsigned long WordCount = 1);
129 unsigned long WriteUint8(uint8_t* pData, unsigned long WordCount = 1);
130 unsigned long WriteInt16(int16_t* pData, unsigned long WordCount = 1);
131 unsigned long WriteUint16(uint16_t* pData, unsigned long WordCount = 1);
132 unsigned long WriteInt32(int32_t* pData, unsigned long WordCount = 1);
133 unsigned long WriteUint32(uint32_t* pData, unsigned long WordCount = 1);
134 void* LoadChunkData();
135 void ReleaseChunkData();
136 void Resize(int iNewSize);
137 virtual ~Chunk();
138 protected:
139 uint32_t ChunkID;
140 uint32_t CurrentChunkSize; /* in bytes */
141 uint32_t NewChunkSize; /* in bytes (if chunk was scheduled to be resized) */
142 List* pParent;
143 File* pFile;
144 unsigned long ulStartPos; /* actual position in file where chunk (without header) starts */
145 unsigned long ulPos; /* # of bytes from ulStartPos */
146 uint8_t* pChunkData;
147
148 Chunk(File* pFile);
149 Chunk(File* pFile, List* pParent, uint32_t uiChunkID, uint uiBodySize);
150 void ReadHeader(unsigned long fPos);
151 void WriteHeader(unsigned long fPos);
152 unsigned long ReadSceptical(void* pData, unsigned long WordCount, unsigned long WordSize);
153 inline void swapBytes_16(void* Word) {
154 uint8_t byteCache = *((uint8_t*) Word);
155 *((uint8_t*) Word) = *((uint8_t*) Word + 1);
156 *((uint8_t*) Word + 1) = byteCache;
157 }
158 inline void swapBytes_32(void* Word) {
159 uint8_t byteCache = *((uint8_t*) Word);
160 *((uint8_t*) Word) = *((uint8_t*) Word + 3);
161 *((uint8_t*) Word + 3) = byteCache;
162 byteCache = *((uint8_t*) Word + 1);
163 *((uint8_t*) Word + 1) = *((uint8_t*) Word + 2);
164 *((uint8_t*) Word + 2) = byteCache;
165 }
166 inline void swapBytes(void* Word, unsigned long WordSize) {
167 uint8_t byteCache;
168 unsigned long lo = 0, hi = WordSize - 1;
169 for (; lo < hi; hi--, lo++) {
170 byteCache = *((uint8_t*) Word + lo);
171 *((uint8_t*) Word + lo) = *((uint8_t*) Word + hi);
172 *((uint8_t*) Word + hi) = byteCache;
173 }
174 }
175 inline String convertToString(uint32_t word) {
176 String result;
177 for (int i = 0; i < 4; i++) {
178 uint8_t byte = *((uint8_t*)(&word) + i);
179 char c = byte;
180 result += c;
181 }
182 return result;
183 }
184 virtual unsigned long WriteChunk(unsigned long ulWritePos, unsigned long ulCurrentDataOffset);
185 virtual void __resetPos(); ///< Sets Chunk's read/write position to zero.
186
187 friend class List;
188 };
189
190 /** Provides convenient methods to access data of RIFF list chunks and their subchunks. */
191 class List : public Chunk {
192 public:
193 List(File* pFile, unsigned long StartPos, List* Parent);
194 String GetListTypeString();
195 uint32_t GetListType() { return ListType; } ///< Returns unsigned integer representation of the list's ID
196 Chunk* GetSubChunk(uint32_t ChunkID);
197 List* GetSubList(uint32_t ListType);
198 Chunk* GetFirstSubChunk();
199 Chunk* GetNextSubChunk();
200 List* GetFirstSubList();
201 List* GetNextSubList();
202 unsigned int CountSubChunks();
203 unsigned int CountSubChunks(uint32_t ChunkID);
204 unsigned int CountSubLists();
205 unsigned int CountSubLists(uint32_t ListType);
206 Chunk* AddSubChunk(uint32_t uiChunkID, uint uiBodySize);
207 List* AddSubList(uint32_t uiListType);
208 void DeleteSubChunk(Chunk* pSubChunk);
209 virtual ~List();
210 protected:
211 typedef std::map<uint32_t, RIFF::Chunk*> ChunkMap;
212 typedef std::list<Chunk*> ChunkList;
213
214 uint32_t ListType;
215 ChunkList* pSubChunks;
216 ChunkMap* pSubChunksMap;
217 ChunkList::iterator ChunksIterator;
218 ChunkList::iterator ListIterator;
219
220 List(File* pFile);
221 List(File* pFile, List* pParent, uint32_t uiListID);
222 void ReadHeader(unsigned long fPos);
223 void WriteHeader(unsigned long fPos);
224 void LoadSubChunks();
225 virtual unsigned long WriteChunk(unsigned long ulWritePos, unsigned long ulCurrentDataOffset);
226 virtual void __resetPos(); ///< Sets List Chunk's read/write position to zero and causes all sub chunks to do the same.
227 };
228
229 /** Parses arbitrary RIFF files and provides together with it's base classes convenient methods to walk through the RIFF tree. */
230 class File : public List {
231 public:
232 File();
233 File(const String& path);
234 stream_mode_t GetMode();
235 bool SetMode(stream_mode_t NewMode);
236 String GetFileName();
237 virtual void Save();
238 virtual void Save(const String& path);
239 virtual ~File();
240 protected:
241 #if POSIX
242 int hFileRead; ///< handle / descriptor for reading from file
243 int hFileWrite; ///< handle / descriptor for writing to (some) file
244 #else
245 FILE* hFileRead; ///< handle / descriptor for reading from file
246 FILE* hFileWrite; ///< handle / descriptor for writing to (some) file
247 #endif // POSIX
248 String Filename;
249 bool bEndianNative;
250
251 void LogAsResized(Chunk* pResizedChunk);
252 friend class Chunk;
253 friend class List;
254 private:
255 stream_mode_t Mode;
256 ChunkList ResizedChunks; ///< All chunks which have been resized (enlarged / shortened).
257
258 unsigned long GetFileSize();
259 void ResizeFile(unsigned long ulNewSize);
260 };
261
262 /** Will be thrown whenever an error occurs while parsing a RIFF file. */
263 class Exception {
264 public:
265 String Message;
266
267 Exception(String Message) { Exception::Message = Message; };
268 void PrintMessage();
269 virtual ~Exception() {};
270 };
271
272 String libraryName();
273 String libraryVersion();
274
275 } // namespace RIFF
276 #endif // __RIFF_H__

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