/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/common/zstream.cpp
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Contents of /trunk/3rdparty/wxWidgets/src/common/zstream.cpp

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 2 months ago) by william
File size: 11787 byte(s)
committing r3113 initial commit again...
1 //////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/zstream.cpp
3 // Purpose: Compressed stream classes
4 // Author: Guilhem Lavaux
5 // Modified by: Mike Wetherell
6 // Created: 11/07/98
7 // RCS-ID: $Id: zstream.cpp 42621 2006-10-29 16:47:20Z MW $
8 // Copyright: (c) Guilhem Lavaux
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // For compilers that support precompilation, includes "wx.h".
13 #include "wx/wxprec.h"
14
15 #ifdef __BORLANDC__
16 #pragma hdrstop
17 #endif
18
19 #if wxUSE_ZLIB && wxUSE_STREAMS
20
21 #include "wx/zstream.h"
22
23 #ifndef WX_PRECOMP
24 #include "wx/intl.h"
25 #include "wx/log.h"
26 #include "wx/utils.h"
27 #endif
28
29
30 // normally, the compiler options should contain -I../zlib, but it is
31 // apparently not the case for all MSW makefiles and so, unless we use
32 // configure (which defines __WX_SETUP_H__) or it is explicitly overridden by
33 // the user (who can define wxUSE_ZLIB_H_IN_PATH), we hardcode the path here
34 #if defined(__WXMSW__) && !defined(__WX_SETUP_H__) && !defined(wxUSE_ZLIB_H_IN_PATH)
35 #include "../zlib/zlib.h"
36 #else
37 #include "zlib.h"
38 #endif
39
40 enum {
41 ZSTREAM_BUFFER_SIZE = 16384,
42 ZSTREAM_GZIP = 0x10, // gzip header
43 ZSTREAM_AUTO = 0x20 // auto detect between gzip and zlib
44 };
45
46
47 /////////////////////////////////////////////////////////////////////////////
48 // Zlib Class factory
49
50 IMPLEMENT_DYNAMIC_CLASS(wxZlibClassFactory, wxFilterClassFactory)
51
52 static wxZlibClassFactory g_wxZlibClassFactory;
53
54 wxZlibClassFactory::wxZlibClassFactory()
55 {
56 if (this == &g_wxZlibClassFactory)
57 PushFront();
58 }
59
60 const wxChar * const *
61 wxZlibClassFactory::GetProtocols(wxStreamProtocolType type) const
62 {
63 static const wxChar *mimes[] = { _T("application/x-deflate"), NULL };
64 static const wxChar *encs[] = { _T("deflate"), NULL };
65 static const wxChar *empty[] = { NULL };
66
67 switch (type) {
68 case wxSTREAM_MIMETYPE: return mimes;
69 case wxSTREAM_ENCODING: return encs;
70 default: return empty;
71 }
72 }
73
74
75 /////////////////////////////////////////////////////////////////////////////
76 // Gzip Class factory
77
78 IMPLEMENT_DYNAMIC_CLASS(wxGzipClassFactory, wxFilterClassFactory)
79
80 static wxGzipClassFactory g_wxGzipClassFactory;
81
82 wxGzipClassFactory::wxGzipClassFactory()
83 {
84 if (this == &g_wxGzipClassFactory && wxZlibInputStream::CanHandleGZip())
85 PushFront();
86 }
87
88 const wxChar * const *
89 wxGzipClassFactory::GetProtocols(wxStreamProtocolType type) const
90 {
91 static const wxChar *protos[] =
92 { _T("gzip"), NULL };
93 static const wxChar *mimes[] =
94 { _T("application/gzip"), _T("application/x-gzip"), NULL };
95 static const wxChar *encs[] =
96 { _T("gzip"), NULL };
97 static const wxChar *exts[] =
98 { _T(".gz"), _T(".gzip"), NULL };
99 static const wxChar *empty[] =
100 { NULL };
101
102 switch (type) {
103 case wxSTREAM_PROTOCOL: return protos;
104 case wxSTREAM_MIMETYPE: return mimes;
105 case wxSTREAM_ENCODING: return encs;
106 case wxSTREAM_FILEEXT: return exts;
107 default: return empty;
108 }
109 }
110
111
112 //////////////////////
113 // wxZlibInputStream
114 //////////////////////
115
116 wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags)
117 : wxFilterInputStream(stream)
118 {
119 Init(flags);
120 }
121
122 wxZlibInputStream::wxZlibInputStream(wxInputStream *stream, int flags)
123 : wxFilterInputStream(stream)
124 {
125 Init(flags);
126 }
127
128 void wxZlibInputStream::Init(int flags)
129 {
130 m_inflate = NULL;
131 m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
132 m_z_size = ZSTREAM_BUFFER_SIZE;
133 m_pos = 0;
134
135 #if WXWIN_COMPATIBILITY_2_4
136 // treat compatibility mode as auto
137 m_24compatibilty = flags == wxZLIB_24COMPATIBLE;
138 if (m_24compatibilty)
139 flags = wxZLIB_AUTO;
140 #endif
141
142 // if gzip is asked for but not supported...
143 if ((flags == wxZLIB_GZIP || flags == wxZLIB_AUTO) && !CanHandleGZip()) {
144 if (flags == wxZLIB_AUTO) {
145 // an error will come later if the input turns out not to be a zlib
146 flags = wxZLIB_ZLIB;
147 }
148 else {
149 wxLogError(_("Gzip not supported by this version of zlib"));
150 m_lasterror = wxSTREAM_READ_ERROR;
151 return;
152 }
153 }
154
155 if (m_z_buffer) {
156 m_inflate = new z_stream_s;
157
158 if (m_inflate) {
159 memset(m_inflate, 0, sizeof(z_stream_s));
160
161 // see zlib.h for documentation on windowBits
162 int windowBits = MAX_WBITS;
163 switch (flags) {
164 case wxZLIB_NO_HEADER: windowBits = -MAX_WBITS; break;
165 case wxZLIB_ZLIB: windowBits = MAX_WBITS; break;
166 case wxZLIB_GZIP: windowBits = MAX_WBITS | ZSTREAM_GZIP; break;
167 case wxZLIB_AUTO: windowBits = MAX_WBITS | ZSTREAM_AUTO; break;
168 default: wxFAIL_MSG(wxT("Invalid zlib flag"));
169 }
170
171 if (inflateInit2(m_inflate, windowBits) == Z_OK)
172 return;
173 }
174 }
175
176 wxLogError(_("Can't initialize zlib inflate stream."));
177 m_lasterror = wxSTREAM_READ_ERROR;
178 }
179
180 wxZlibInputStream::~wxZlibInputStream()
181 {
182 inflateEnd(m_inflate);
183 delete m_inflate;
184
185 delete [] m_z_buffer;
186 }
187
188 size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size)
189 {
190 wxASSERT_MSG(m_inflate && m_z_buffer, wxT("Inflate stream not open"));
191
192 if (!m_inflate || !m_z_buffer)
193 m_lasterror = wxSTREAM_READ_ERROR;
194 if (!IsOk() || !size)
195 return 0;
196
197 int err = Z_OK;
198 m_inflate->next_out = (unsigned char *)buffer;
199 m_inflate->avail_out = size;
200
201 while (err == Z_OK && m_inflate->avail_out > 0) {
202 if (m_inflate->avail_in == 0 && m_parent_i_stream->IsOk()) {
203 m_parent_i_stream->Read(m_z_buffer, m_z_size);
204 m_inflate->next_in = m_z_buffer;
205 m_inflate->avail_in = m_parent_i_stream->LastRead();
206 }
207 err = inflate(m_inflate, Z_SYNC_FLUSH);
208 }
209
210 switch (err) {
211 case Z_OK:
212 break;
213
214 case Z_STREAM_END:
215 if (m_inflate->avail_out) {
216 // Unread any data taken from past the end of the deflate stream, so that
217 // any additional data can be read from the underlying stream (the crc
218 // in a gzip for example)
219 if (m_inflate->avail_in) {
220 m_parent_i_stream->Reset();
221 m_parent_i_stream->Ungetch(m_inflate->next_in, m_inflate->avail_in);
222 m_inflate->avail_in = 0;
223 }
224 m_lasterror = wxSTREAM_EOF;
225 }
226 break;
227
228 case Z_BUF_ERROR:
229 // Indicates that zlib was expecting more data, but the parent stream
230 // has none. Other than Eof the error will have been already reported
231 // by the parent strean,
232 m_lasterror = wxSTREAM_READ_ERROR;
233 if (m_parent_i_stream->Eof())
234 #if WXWIN_COMPATIBILITY_2_4
235 if (m_24compatibilty)
236 m_lasterror = wxSTREAM_EOF;
237 else
238 #endif
239 wxLogError(_("Can't read inflate stream: unexpected EOF in underlying stream."));
240 break;
241
242 default:
243 wxString msg(m_inflate->msg, *wxConvCurrent);
244 if (!msg)
245 msg = wxString::Format(_("zlib error %d"), err);
246 wxLogError(_("Can't read from inflate stream: %s"), msg.c_str());
247 m_lasterror = wxSTREAM_READ_ERROR;
248 }
249
250 size -= m_inflate->avail_out;
251 m_pos += size;
252 return size;
253 }
254
255 /* static */ bool wxZlibInputStream::CanHandleGZip()
256 {
257 const char *dot = strchr(zlibVersion(), '.');
258 int major = atoi(zlibVersion());
259 int minor = dot ? atoi(dot + 1) : 0;
260 return major > 1 || (major == 1 && minor >= 2);
261 }
262
263
264 //////////////////////
265 // wxZlibOutputStream
266 //////////////////////
267
268 wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream,
269 int level,
270 int flags)
271 : wxFilterOutputStream(stream)
272 {
273 Init(level, flags);
274 }
275
276 wxZlibOutputStream::wxZlibOutputStream(wxOutputStream *stream,
277 int level,
278 int flags)
279 : wxFilterOutputStream(stream)
280 {
281 Init(level, flags);
282 }
283
284 void wxZlibOutputStream::Init(int level, int flags)
285 {
286 m_deflate = NULL;
287 m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
288 m_z_size = ZSTREAM_BUFFER_SIZE;
289 m_pos = 0;
290
291 if ( level == -1 )
292 {
293 level = Z_DEFAULT_COMPRESSION;
294 }
295 else
296 {
297 wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!"));
298 }
299
300 // if gzip is asked for but not supported...
301 if (flags == wxZLIB_GZIP && !CanHandleGZip()) {
302 wxLogError(_("Gzip not supported by this version of zlib"));
303 m_lasterror = wxSTREAM_WRITE_ERROR;
304 return;
305 }
306
307 if (m_z_buffer) {
308 m_deflate = new z_stream_s;
309
310 if (m_deflate) {
311 memset(m_deflate, 0, sizeof(z_stream_s));
312 m_deflate->next_out = m_z_buffer;
313 m_deflate->avail_out = m_z_size;
314
315 // see zlib.h for documentation on windowBits
316 int windowBits = MAX_WBITS;
317 switch (flags) {
318 case wxZLIB_NO_HEADER: windowBits = -MAX_WBITS; break;
319 case wxZLIB_ZLIB: windowBits = MAX_WBITS; break;
320 case wxZLIB_GZIP: windowBits = MAX_WBITS | ZSTREAM_GZIP; break;
321 default: wxFAIL_MSG(wxT("Invalid zlib flag"));
322 }
323
324 if (deflateInit2(m_deflate, level, Z_DEFLATED, windowBits,
325 8, Z_DEFAULT_STRATEGY) == Z_OK)
326 return;
327 }
328 }
329
330 wxLogError(_("Can't initialize zlib deflate stream."));
331 m_lasterror = wxSTREAM_WRITE_ERROR;
332 }
333
334 bool wxZlibOutputStream::Close()
335 {
336 DoFlush(true);
337 deflateEnd(m_deflate);
338 delete m_deflate;
339
340 m_deflate = NULL;
341 delete[] m_z_buffer;
342 m_z_buffer = NULL;
343
344 return wxFilterOutputStream::Close() && IsOk();
345 }
346
347 void wxZlibOutputStream::DoFlush(bool final)
348 {
349 if (!m_deflate || !m_z_buffer)
350 m_lasterror = wxSTREAM_WRITE_ERROR;
351 if (!IsOk())
352 return;
353
354 int err = Z_OK;
355 bool done = false;
356
357 while (err == Z_OK || err == Z_STREAM_END) {
358 size_t len = m_z_size - m_deflate->avail_out;
359 if (len) {
360 if (m_parent_o_stream->Write(m_z_buffer, len).LastWrite() != len) {
361 m_lasterror = wxSTREAM_WRITE_ERROR;
362 wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream"));
363 break;
364 }
365 m_deflate->next_out = m_z_buffer;
366 m_deflate->avail_out = m_z_size;
367 }
368
369 if (done)
370 break;
371 err = deflate(m_deflate, final ? Z_FINISH : Z_FULL_FLUSH);
372 done = m_deflate->avail_out != 0 || err == Z_STREAM_END;
373 }
374 }
375
376 size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size)
377 {
378 wxASSERT_MSG(m_deflate && m_z_buffer, wxT("Deflate stream not open"));
379
380 if (!m_deflate || !m_z_buffer)
381 {
382 // notice that this will make IsOk() test just below return false
383 m_lasterror = wxSTREAM_WRITE_ERROR;
384 }
385
386 if (!IsOk() || !size)
387 return 0;
388
389 int err = Z_OK;
390 m_deflate->next_in = (unsigned char *)buffer;
391 m_deflate->avail_in = size;
392
393 while (err == Z_OK && m_deflate->avail_in > 0) {
394 if (m_deflate->avail_out == 0) {
395 m_parent_o_stream->Write(m_z_buffer, m_z_size);
396 if (m_parent_o_stream->LastWrite() != m_z_size) {
397 m_lasterror = wxSTREAM_WRITE_ERROR;
398 wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream"));
399 break;
400 }
401
402 m_deflate->next_out = m_z_buffer;
403 m_deflate->avail_out = m_z_size;
404 }
405
406 err = deflate(m_deflate, Z_NO_FLUSH);
407 }
408
409 if (err != Z_OK) {
410 m_lasterror = wxSTREAM_WRITE_ERROR;
411 wxString msg(m_deflate->msg, *wxConvCurrent);
412 if (!msg)
413 msg = wxString::Format(_("zlib error %d"), err);
414 wxLogError(_("Can't write to deflate stream: %s"), msg.c_str());
415 }
416
417 size -= m_deflate->avail_in;
418 m_pos += size;
419 return size;
420 }
421
422 /* static */ bool wxZlibOutputStream::CanHandleGZip()
423 {
424 return wxZlibInputStream::CanHandleGZip();
425 }
426
427 #endif
428 // wxUSE_ZLIB && wxUSE_STREAMS

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