Read and write binary files in binary mode on Windows.
[wine/multimedia.git] / server / mapping.c
blobccd0e8c9763d281549c1fb1c8ea986993b5c94be
1 /*
2 * Server-side file mapping management
4 * Copyright (C) 1999 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "config.h"
22 #include "wine/port.h"
24 #include <assert.h>
25 #include <stdarg.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <sys/stat.h>
29 #include <unistd.h>
31 #include "windef.h"
32 #include "winbase.h"
34 #include "file.h"
35 #include "handle.h"
36 #include "thread.h"
37 #include "request.h"
39 struct mapping
41 struct object obj; /* object header */
42 int size_high; /* mapping size */
43 int size_low; /* mapping size */
44 int protect; /* protection flags */
45 struct file *file; /* file mapped */
46 int header_size; /* size of headers (for PE image mapping) */
47 void *base; /* default base addr (for PE image mapping) */
48 struct file *shared_file; /* temp file for shared PE mapping */
49 int shared_size; /* shared mapping total size */
50 struct mapping *shared_next; /* next in shared PE mapping list */
51 struct mapping *shared_prev; /* prev in shared PE mapping list */
54 static void mapping_dump( struct object *obj, int verbose );
55 static struct fd *mapping_get_fd( struct object *obj );
56 static void mapping_destroy( struct object *obj );
58 static const struct object_ops mapping_ops =
60 sizeof(struct mapping), /* size */
61 mapping_dump, /* dump */
62 no_add_queue, /* add_queue */
63 NULL, /* remove_queue */
64 NULL, /* signaled */
65 NULL, /* satisfied */
66 mapping_get_fd, /* get_fd */
67 mapping_destroy /* destroy */
70 static struct mapping *shared_first;
72 #ifdef __i386__
74 /* These are always the same on an i386, and it will be faster this way */
75 # define page_mask 0xfff
76 # define page_shift 12
77 # define init_page_size() do { /* nothing */ } while(0)
79 #else /* __i386__ */
81 static int page_shift, page_mask;
83 static void init_page_size(void)
85 int page_size;
86 # ifdef HAVE_GETPAGESIZE
87 page_size = getpagesize();
88 # else
89 # ifdef __svr4__
90 page_size = sysconf(_SC_PAGESIZE);
91 # else
92 # error Cannot get the page size on this platform
93 # endif
94 # endif
95 page_mask = page_size - 1;
96 /* Make sure we have a power of 2 */
97 assert( !(page_size & page_mask) );
98 page_shift = 0;
99 while ((1 << page_shift) != page_size) page_shift++;
101 #endif /* __i386__ */
103 #define ROUND_ADDR(addr) \
104 ((int)(addr) & ~page_mask)
106 #define ROUND_SIZE(addr,size) \
107 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
110 /* find the shared PE mapping for a given mapping */
111 static struct file *get_shared_file( struct mapping *mapping )
113 struct mapping *ptr;
115 for (ptr = shared_first; ptr; ptr = ptr->shared_next)
116 if (is_same_file( ptr->file, mapping->file ))
117 return (struct file *)grab_object( ptr->shared_file );
118 return NULL;
121 /* allocate and fill the temp file for a shared PE image mapping */
122 static int build_shared_mapping( struct mapping *mapping, int fd,
123 IMAGE_SECTION_HEADER *sec, int nb_sec )
125 int i, max_size, total_size, pos;
126 char *buffer = NULL;
127 int shared_fd;
128 long toread;
130 /* compute the total size of the shared mapping */
132 total_size = max_size = 0;
133 for (i = 0; i < nb_sec; i++)
135 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
136 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
138 int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
139 if (size > max_size) max_size = size;
140 total_size += size;
143 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
145 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
147 /* create a temp file for the mapping */
149 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
150 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
151 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
153 if (!(buffer = malloc( max_size ))) goto error;
155 /* copy the shared sections data into the temp file */
157 for (i = pos = 0; i < nb_sec; i++)
159 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
160 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
161 if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
162 pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
163 if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
164 !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
165 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
166 if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
167 toread = sec[i].SizeOfRawData;
168 while (toread)
170 long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
171 if (res <= 0) goto error;
172 toread -= res;
174 if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
176 free( buffer );
177 return 1;
179 error:
180 release_object( mapping->shared_file );
181 mapping->shared_file = NULL;
182 if (buffer) free( buffer );
183 return 0;
186 /* retrieve the mapping parameters for an executable (PE) image */
187 static int get_image_params( struct mapping *mapping )
189 IMAGE_DOS_HEADER dos;
190 IMAGE_NT_HEADERS nt;
191 IMAGE_SECTION_HEADER *sec = NULL;
192 struct fd *fd;
193 int unix_fd, filepos, size;
195 /* load the headers */
197 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
198 unix_fd = get_unix_fd( fd );
199 filepos = lseek( unix_fd, 0, SEEK_SET );
200 if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
201 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
202 if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
204 if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
205 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
206 if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
207 /* zero out Optional header in the case it's not present or partial */
208 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
209 if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
211 /* load the section headers */
213 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
214 if (!(sec = malloc( size ))) goto error;
215 if (read( unix_fd, sec, size ) != size) goto error;
217 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
219 if (mapping->shared_file) /* link it in the list */
221 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
222 mapping->shared_prev = NULL;
223 shared_first = mapping;
226 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
227 mapping->size_high = 0;
228 mapping->base = (void *)nt.OptionalHeader.ImageBase;
229 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
230 mapping->protect = VPROT_IMAGE;
232 /* sanity check */
233 if (mapping->header_size > mapping->size_low) goto error;
235 lseek( unix_fd, filepos, SEEK_SET );
236 free( sec );
237 release_object( fd );
238 return 1;
240 error:
241 lseek( unix_fd, filepos, SEEK_SET );
242 if (sec) free( sec );
243 release_object( fd );
244 set_error( STATUS_INVALID_FILE_FOR_SECTION );
245 return 0;
248 /* get the size of the unix file associated with the mapping */
249 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
251 struct stat st;
252 int unix_fd = get_file_unix_fd( file );
254 if (fstat( unix_fd, &st ) == -1) return 0;
255 *size_high = st.st_size >> 32;
256 *size_low = st.st_size & 0xffffffff;
257 return 1;
260 static struct object *create_mapping( int size_high, int size_low, int protect,
261 obj_handle_t handle, const WCHAR *name, size_t len )
263 struct mapping *mapping;
264 int access = 0;
266 if (!page_mask) init_page_size();
268 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
269 return NULL;
270 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
271 return &mapping->obj; /* Nothing else to do */
273 mapping->header_size = 0;
274 mapping->base = NULL;
275 mapping->shared_file = NULL;
276 mapping->shared_size = 0;
278 if (protect & VPROT_READ) access |= GENERIC_READ;
279 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
281 if (handle)
283 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
284 if (protect & VPROT_IMAGE)
286 if (!get_image_params( mapping )) goto error;
287 return &mapping->obj;
289 if (!size_high && !size_low)
291 if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
293 else
295 if (!grow_file( mapping->file, size_high, size_low )) goto error;
298 else /* Anonymous mapping (no associated file) */
300 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
302 set_error( STATUS_INVALID_PARAMETER );
303 mapping->file = NULL;
304 goto error;
306 if (!(mapping->file = create_temp_file( access ))) goto error;
307 if (!grow_file( mapping->file, size_high, size_low )) goto error;
309 mapping->size_high = size_high;
310 mapping->size_low = ROUND_SIZE( 0, size_low );
311 mapping->protect = protect;
312 return &mapping->obj;
314 error:
315 release_object( mapping );
316 return NULL;
319 static void mapping_dump( struct object *obj, int verbose )
321 struct mapping *mapping = (struct mapping *)obj;
322 assert( obj->ops == &mapping_ops );
323 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
324 "shared_file=%p shared_size=%08x ",
325 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
326 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
327 dump_object_name( &mapping->obj );
328 fputc( '\n', stderr );
331 static struct fd *mapping_get_fd( struct object *obj )
333 struct mapping *mapping = (struct mapping *)obj;
334 return get_obj_fd( (struct object *)mapping->file );
337 static void mapping_destroy( struct object *obj )
339 struct mapping *mapping = (struct mapping *)obj;
340 assert( obj->ops == &mapping_ops );
341 if (mapping->file) release_object( mapping->file );
342 if (mapping->shared_file)
344 release_object( mapping->shared_file );
345 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
346 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
347 else shared_first = mapping->shared_next;
351 int get_page_size(void)
353 if (!page_mask) init_page_size();
354 return page_mask + 1;
357 /* create a file mapping */
358 DECL_HANDLER(create_mapping)
360 struct object *obj;
362 reply->handle = 0;
363 if ((obj = create_mapping( req->size_high, req->size_low,
364 req->protect, req->file_handle,
365 get_req_data(), get_req_data_size() )))
367 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
368 release_object( obj );
372 /* open a handle to a mapping */
373 DECL_HANDLER(open_mapping)
375 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
376 &mapping_ops, req->access, req->inherit );
379 /* get a mapping information */
380 DECL_HANDLER(get_mapping_info)
382 struct mapping *mapping;
384 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
385 0, &mapping_ops )))
387 reply->size_high = mapping->size_high;
388 reply->size_low = mapping->size_low;
389 reply->protect = mapping->protect;
390 reply->header_size = mapping->header_size;
391 reply->base = mapping->base;
392 reply->shared_file = 0;
393 reply->shared_size = mapping->shared_size;
394 reply->drive_type = get_file_drive_type( mapping->file );
395 if (mapping->shared_file)
396 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
397 GENERIC_READ|GENERIC_WRITE, 0 );
398 release_object( mapping );