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OgreStreamSerialiser.h @ 148

Last change on this file since 148 was 148, checked in by patricwi, 6 years ago
Added new dependencies for ogre1.9 and cegui0.8
File size: 15.3 KB

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1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org/
6
7	Copyright (c) 2000-2013 Torus Knot Software Ltd
8
9	Permission is hereby granted, free of charge, to any person obtaining a copy
10	of this software and associated documentation files (the "Software"), to deal
11	in the Software without restriction, including without limitation the rights
12	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13	copies of the Software, and to permit persons to whom the Software is
14	furnished to do so, subject to the following conditions:
15
16	The above copyright notice and this permission notice shall be included in
17	all copies or substantial portions of the Software.
18
19	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25	THE SOFTWARE.
26	-----------------------------------------------------------------------------
27	*/
28	#ifndef __StreamSerialiser_H__
29	#define __StreamSerialiser_H__
30
31	#include "OgrePrerequisites.h"
32	#include "OgreDataStream.h"
33	#include "OgreHeaderPrefix.h"
34
35	namespace Ogre
36	{
37	/** \addtogroup Core
38	* @{
39	*/
40	/** \addtogroup Resources
41	* @{
42	*/
43
44	/** Utility class providing helper methods for reading / writing
45	structured data held in a DataStream.
46	@remarks
47	The structure of a file read / written by this class is a series of
48	'chunks'. A chunk-based format has the advantage of being extensible later,
49	and it's robust, in that a reader can skip chunks that they are not
50	able (or willing) to process.
51	@par
52	Chunks are contained serially in the file, but they can also be
53	nested in order both to provide context, and to group chunks together for
54	potential skipping.
55	@par
56	The data format of a chunk is as follows:
57	-# Chunk ID (32-bit uint). This can be any number unique in a context, except the numbers 0x0000, 0x0001 and 0x1000, which are reserved for Ogre's use
58	-# Chunk version (16-bit uint). Chunks can change over time so this version number reflects that
59	-# Length (32-bit uint). The length of the chunk data section, including nested chunks. Note that
60	this length excludes this header, but includes the header of any nested chunks.
61	-# Checksum (32-bit uint). Checksum value generated from the above - basically lets us check this is a valid chunk.
62	-# Chunk data
63	The 'Chunk data' section will contain chunk-specific data, which may include
64	other nested chunks.
65	*/
66	class _OgreExport StreamSerialiser : public StreamAlloc
67	{
68	public:
69	/// The endianness of files
70	enum Endian
71	{
72	/// Automatically determine endianness
73	ENDIAN_AUTO,
74	/// Use big endian (0x1000 is serialised as 0x10 0x00)
75	ENDIAN_BIG,
76	/// Use little endian (0x1000 is serialised as 0x00 0x10)
77	ENDIAN_LITTLE
78	};
79
80	/// The storage format of Real values
81	enum RealStorageFormat
82	{
83	/// Real is stored as float, reducing precision if you're using OGRE_DOUBLE_PRECISION
84	REAL_FLOAT,
85	/// Real as stored as double, not useful unless you're using OGRE_DOUBLE_PRECISION
86	REAL_DOUBLE
87	};
88
89
90	/// Definition of a chunk of data in a file
91	struct Chunk : public StreamAlloc
92	{
93	/// Identifier of the chunk (for example from makeIdentifier) (stored)
94	uint32 id;
95	/// Version of the chunk (stored)
96	uint16 version;
97	/// Length of the chunk data in bytes, excluding the header of this chunk (stored)
98	uint32 length;
99	/// Location of the chunk (header) in bytes from the start of a stream (derived)
100	uint32 offset;
101
102	Chunk() : id(0), version(1), length(0), offset(0) {}
103	};
104
105	/** Constructor.
106	@param stream The stream on which you will read / write data.
107	@param endianMode The endian mode in which to read / writedata. If left at
108	the default, when writing the endian mode will be the native platform mode,
109	and when reading it's expected that the first chunk encountered will be
110	the header chunk, which will determine the endian mode.
111	@param autoHeader If true, the first write or read to this stream will
112	automatically read / write the header too. This is required if you
113	set endianMode to ENDIAN_AUTO, but if you manually set the endian mode,
114	then you can skip writing / reading the header if you wish, if for example
115	this stream is midway through a file which has already included header
116	information.
117	@param realFormat Set the format you want to write reals in. Only useful for files that
118	you're writing (since when reading this is picked up from the file),
119	and can only be changed if autoHeader is true, since real format is stored in the header.
120	Defaults to float unless you're using OGRE_DOUBLE_PRECISION.
121	*/
122	StreamSerialiser(const DataStreamPtr& stream, Endian endianMode = ENDIAN_AUTO,
123	bool autoHeader = true,
124	#if OGRE_DOUBLE_PRECISION
125	RealStorageFormat realFormat = REAL_DOUBLE
126	#else
127	RealStorageFormat realFormat = REAL_FLOAT
128	#endif
129	);
130	virtual ~StreamSerialiser();
131
132	/** Get the endian mode.
133	@remarks
134	If the result is ENDIAN_AUTO, this mode will change when the first piece of
135	data is read / written.
136	*/
137	virtual Endian getEndian() const { return mEndian; }
138
139	/** Pack a 4-character code into a 32-bit identifier.
140	@remarks
141	You can use this to generate id's for your chunks based on friendlier
142	4-character codes rather than assigning numerical IDs, if you like.
143	@param code String to pack - must be 4 characters.
144	*/
145	static uint32 makeIdentifier(const String& code);
146
147	/** Report the current depth of the chunk nesting, whether reading or writing.
148	@remarks
149	Returns how many levels of nested chunks are currently being processed,
150	either writing or reading. In order to tidily finish, you must call
151	read/writeChunkEnd this many times.
152	*/
153	size_t getCurrentChunkDepth() const { return mChunkStack.size(); }
154
155	/** Get the ID of the chunk that's currently being read/written, if any.
156	@return The id of the current chunk being read / written (at the tightest
157	level of nesting), or zero if no chunk is being processed.
158	*/
159	uint32 getCurrentChunkID() const;
160
161	/** Get the current byte position relative to the start of the data section
162	of the last chunk that was read or written.
163	@return the offset. Note that a return value of 0 means that either the
164	position is at the start of the chunk data section (ie right after the
165	header), or that no chunk is currently active. Use getCurrentChunkID
166	or getCurrentChunkDepth to determine if a chunk is active.
167	*/
168	size_t getOffsetFromChunkStart() const;
169
170	/** Reads the start of the next chunk in the file.
171	@remarks
172	Files are serialised in a chunk-based manner, meaning that each section
173	of data is prepended by a chunk header. After reading this chunk header,
174	the next set of data is available directly afterwards.
175	@note
176	When you have finished with this chunk, you should call readChunkEnd.
177	This will perform a bit of validation and clear the chunk from
178	the stack.
179	@return The Chunk that comes next
180	*/
181	virtual const Chunk* readChunkBegin();
182
183	/** Reads the start of the next chunk so long as it's of a given ID and version.
184	@remarks
185	This method operates like readChunkBegin, except it checks the ID and
186	version.
187	@param id The ID you're expecting. If the next chunk isn't of this ID, then
188	the chunk read is undone and the method returns null.
189	@param maxVersion The maximum version you're able to process. If the ID is correct
190	but the version exceeds what is passed in here, the chunk is skipped over,
191	the problem logged and null is returned.
192	@param msg Descriptive text added to the log if versions are not compatible
193	@return The chunk if it passes the validation.
194	*/
195	virtual const Chunk* readChunkBegin(uint32 id, uint16 maxVersion, const String& msg = StringUtil::BLANK);
196
197	/** Call this to 'rewind' the stream to just before the start of the current
198	chunk.
199	@remarks
200	The most common case of wanting to use this is if you'd calledReadChunkBegin(),
201	but the chunk you read wasn't one you wanted to process, and rather than
202	skipping over it (which readChunkEnd() would do), you want to backtrack
203	and give something else an opportunity to read it.
204	@param id The id of the chunk that you were reading (for validation purposes)
205	*/
206	virtual void undoReadChunk(uint32 id);
207
208	/** Call this to 'peek' at the next chunk ID without permanently moving the stream pointer. */
209	virtual uint32 peekNextChunkID();
210
211	/** Finish the reading of a chunk.
212	@remarks
213	You can call this method at any point after calling readChunkBegin, even
214	if you didn't read all the rest of the data in the chunk. If you did
215	not read to the end of a chunk, this method will automatically skip
216	over the remainder of the chunk and position the stream just after it.
217	@param id The id of the chunk that you were reading (for validation purposes)
218	*/
219	virtual void readChunkEnd(uint32 id);
220
221	/** Return whether the current data pointer is at the end of the current chunk.
222	@param id The id of the chunk that you were reading (for validation purposes)
223	*/
224	virtual bool isEndOfChunk(uint32 id);
225
226	/// Reports whether the stream is at the end of file
227	virtual bool eof() const;
228
229	/** Get the definition of the current chunk being read (if any). */
230	virtual const Chunk* getCurrentChunk() const;
231
232	/** Begin writing a new chunk.
233	@remarks
234	This starts the process of writing a new chunk to the stream. This will
235	write the chunk header for you, and store a pointer so that the
236	class can automatically go back and fill in the size for you later
237	should you need it to. If you have already begun a chunk without ending
238	it, then this method will start a nested chunk within it. Once written,
239	you can then start writing chunk-specific data into your stream.
240	@note If this is the first chunk in the file
241	@param id The identifier of the new chunk. Any value that's unique in the
242	file context is valid, except for the numbers 0x0001 and 0x1000 which are reserved
243	for internal header identification use.
244	@param version The version of the chunk you're writing
245	*/
246	virtual void writeChunkBegin(uint32 id, uint16 version = 1);
247	/** End writing a chunk.
248	@param id The identifier of the chunk - this is really just a safety check,
249	since you can only end the chunk you most recently started.
250	*/
251	virtual void writeChunkEnd(uint32 id);
252
253	/** Write arbitrary data to a stream.
254	@param buf Pointer to bytes
255	@param size The size of each element to write; each will be endian-flipped if
256	necessary
257	@param count The number of elements to write
258	*/
259	virtual void writeData(const void* buf, size_t size, size_t count);
260
261	/** Catch-all method to write primitive types. */
262	template <typename T>
263	void write(const T* pT, size_t count = 1)
264	{
265	writeData(pT, sizeof(T), count);
266	}
267
268	// Special-case Real since we need to deal with single/double precision
269	virtual void write(const Real* val, size_t count = 1);
270
271	virtual void write(const Vector2* vec, size_t count = 1);
272	virtual void write(const Vector3* vec, size_t count = 1);
273	virtual void write(const Vector4* vec, size_t count = 1);
274	virtual void write(const Quaternion* q, size_t count = 1);
275	virtual void write(const Matrix3* m, size_t count = 1);
276	virtual void write(const Matrix4* m, size_t count = 1);
277	virtual void write(const String* string);
278	virtual void write(const AxisAlignedBox* aabb, size_t count = 1);
279	virtual void write(const Sphere* sphere, size_t count = 1);
280	virtual void write(const Plane* plane, size_t count = 1);
281	virtual void write(const Ray* ray, size_t count = 1);
282	virtual void write(const Radian* angle, size_t count = 1);
283	virtual void write(const Node* node, size_t count = 1);
284	virtual void write(const bool* boolean, size_t count = 1);
285
286
287	/** Read arbitrary data from a stream.
288	@param buf Pointer to bytes
289	@param size The size of each element to read; each will be endian-flipped if
290	necessary
291	@param count The number of elements to read
292	*/
293	virtual void readData(void* buf, size_t size, size_t count);
294
295	/** Catch-all method to read primitive types. */
296	template <typename T>
297	void read(T* pT, size_t count = 1)
298	{
299	readData(pT, sizeof(T), count);
300	}
301
302	// Special case Real, single/double-precision issues
303	virtual void read(Real* val, size_t count = 1);
304
305	/// read a Vector3
306	virtual void read(Vector2* vec, size_t count = 1);
307	virtual void read(Vector3* vec, size_t count = 1);
308	virtual void read(Vector4* vec, size_t count = 1);
309	virtual void read(Quaternion* q, size_t count = 1);
310	virtual void read(Matrix3* m, size_t count = 1);
311	virtual void read(Matrix4* m, size_t count = 1);
312	virtual void read(String* string);
313	virtual void read(AxisAlignedBox* aabb, size_t count = 1);
314	virtual void read(Sphere* sphere, size_t count = 1);
315	virtual void read(Plane* plane, size_t count = 1);
316	virtual void read(Ray* ray, size_t count = 1);
317	virtual void read(Radian* angle, size_t count = 1);
318	virtual void read(Node* node, size_t count = 1);
319	virtual void read(bool* val, size_t count = 1);
320
321	/** Start (un)compressing data
322	@param avail_in Available bytes for uncompressing
323	*/
324	virtual void startDeflate(size_t avail_in = 0);
325	/** Stop (un)compressing data
326	*/
327	virtual void stopDeflate();
328	protected:
329	DataStreamPtr mStream;
330	DataStreamPtr mOriginalStream;
331	Endian mEndian;
332	bool mFlipEndian;
333	bool mReadWriteHeader;
334	RealStorageFormat mRealFormat;
335	typedef deque<Chunk*>::type ChunkStack;
336	/// Current list of open chunks
337	ChunkStack mChunkStack;
338
339	static uint32 HEADER_ID;
340	static uint32 REVERSE_HEADER_ID;
341	static uint32 CHUNK_HEADER_SIZE;
342
343	virtual Chunk* readChunkImpl();
344	virtual void writeChunkImpl(uint32 id, uint16 version);
345	virtual void readHeader();
346	virtual void writeHeader();
347	virtual uint32 calculateChecksum(Chunk* c);
348	virtual void checkStream(bool failOnEof = false,
349	bool validateReadable = false, bool validateWriteable = false) const;
350
351	virtual void flipEndian(void * pData, size_t size, size_t count);
352	virtual void flipEndian(void * pData, size_t size);
353	virtual void determineEndianness();
354	virtual Chunk* popChunk(uint id);
355
356	virtual void writeFloatsAsDoubles(const float* val, size_t count);
357	virtual void writeDoublesAsFloats(const double* val, size_t count);
358	virtual void readFloatsAsDoubles(double* val, size_t count);
359	virtual void readDoublesAsFloats(float* val, size_t count);
360	template <typename T, typename U>
361	void writeConverted(const T* src, U typeToWrite, size_t count)
362	{
363	U* tmp = OGRE_ALLOC_T(U, count, MEMCATEGORY_GENERAL);
364	U* pDst = tmp;
365	const T* pSrc = src;
366	for (size_t i = 0; i < count; ++i)
367	pDst++ = static_cast<U>(pSrc++);
368
369	writeData(tmp, sizeof(U), count);
370
371	OGRE_FREE(tmp, MEMCATEGORY_GENERAL);
372	}
373	template <typename T, typename U>
374	void readConverted(T* dst, U typeToRead, size_t count)
375	{
376	U* tmp = OGRE_ALLOC_T(U, count, MEMCATEGORY_GENERAL);
377	readData(tmp, sizeof(U), count);
378
379	T* pDst = dst;
380	const U* pSrc = tmp;
381	for (size_t i = 0; i < count; ++i)
382	pDst++ = static_cast<T>(pSrc++);
383
384
385	OGRE_FREE(tmp, MEMCATEGORY_GENERAL);
386	}
387
388	};
389	/** @} */
390	/** @} */
391	}
392
393	#include "OgreHeaderSuffix.h"
394
395	#endif
396

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