2 * Copyright (c) 2004 Teodor Sigaev <teodor@sigaev.ru>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
23 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <sys/types.h>
44 findFreeSpace(FDB *db, size_t length) {
45 FDBFreeSpace *ptr = db->space;
47 while(ptr && ptr - db->space < db->listcur) {
48 if ( ptr->length >= length )
57 addFreeSpace(FDB *db, off_t offset, size_t length) {
58 if ( db->listcur >= db->listlen ) {
60 db->space = (FDBFreeSpace*) trealloc( db->space, db->listlen * sizeof(FDBFreeSpace) );
63 db->space[ db->listcur ].offset=offset;
64 db->space[ db->listcur ].length=length;
70 cmpFS(const void* a, const void* b) {
71 if ( ((FDBFreeSpace*)a)->offset == ((FDBFreeSpace*)b)->offset )
73 return ( ((FDBFreeSpace*)a)->offset > ((FDBFreeSpace*)b)->offset ) ? 1 : -1;
77 FDBVacuumFreeSpace(FDB *db) {
78 FDBFreeSpace *ptr=db->space+1, *ok=db->space;
80 if ( db->listcur < 2 )
83 qsort( db->space, db->listcur, sizeof(FDBFreeSpace), cmpFS);
86 while( ptr - db->space < db->listcur ) {
87 if ( ok->offset + ok->length == ptr->offset || ptr->length==0 ) {
88 ok->length += ptr->length;
95 /* remove void spaces */
97 while( ptr - db->space < db->listcur ) {
98 if ( ptr->length != 0 ) {
100 memcpy(ok,ptr,sizeof(FDBFreeSpace));
105 db->listcur = ok - db->space;
109 FDBOpen(FDB *db, char *file, int readonly) {
113 memset(db, 0, sizeof(FDB));
117 db->fd = open(file, O_RDONLY | O_SHLOCK);
119 db->fd = open(file, O_CREAT | O_RDWR | O_EXLOCK, 0666);
123 memset(db, 0, sizeof(FDB));
124 tlog(TL_CRIT,"FDBOpen: open failed: %s", strerror(errno));
128 rc = read(db->fd, &header, sizeof(FDBHeader));
132 tlog(TL_CRIT,"FDBOpen: read failed: %s", strerror(errno));
134 } else if ( rc==0 ) {
135 memset(&header, 0, sizeof(FDBHeader));
136 } else if ( rc != sizeof(FDBHeader) ) {
138 tlog(TL_CRIT,"FDBOpen: header fault: %d bytes only", rc);
140 } else if ( header.isopened ) {
142 tlog(TL_CRIT,"FDBOpen: file wasn't closed correctly");
147 if ( !db->readonly ) {
148 if ( header.freespace ) {
149 db->listlen = db->listcur = (header.lenfreespace / sizeof(FDBFreeSpace));
150 db->space = (FDBFreeSpace*)tmalloc( header.lenfreespace + sizeof(FDBFreeSpace) );
152 if ( lseek(db->fd, header.freespace, SEEK_SET)!=header.freespace ||
153 read( db->fd, db->space, header.lenfreespace ) != header.lenfreespace ) {
155 tlog(TL_CRIT,"FDBOpen: free space read failed: %s", strerror(errno));
158 FDBVacuumFreeSpace(db);
161 db->space = (FDBFreeSpace*)tmalloc( db->listlen*sizeof(FDBFreeSpace) );
164 header.freespace = 0;
165 header.lenfreespace = 0;
168 if ( lseek(db->fd, 0, SEEK_SET)!=0 ||
169 write(db->fd, &header, sizeof(FDBHeader)) != sizeof(FDBHeader) ||
172 if ( db->space ) tfree( db->space );
173 tlog(TL_CRIT,"FDBOpen: can't modify header: %s", strerror(errno));
184 if ( !db->readonly) {
187 memset(&header,0,sizeof(FDBHeader));
192 FDBVacuumFreeSpace(db);
194 header.lenfreespace = sizeof(FDBFreeSpace)*db->listcur;
195 ptr = findFreeSpace( db, header.lenfreespace );
198 header.freespace = ptr->offset;
199 if ( lseek(db->fd, ptr->offset, SEEK_SET) != ptr->offset )
200 tlog(TL_CRIT|TL_EXIT,"FDBClose: lseek failed: %s", strerror(errno));
202 if ( (header.freespace = lseek(db->fd, 0, SEEK_END)) < 0 )
203 tlog(TL_CRIT|TL_EXIT,"FDBClose: lseek failed: %s", strerror(errno));
204 header.lenfreespace += sizeof(FDBFreeSpace);
205 addFreeSpace(db, header.freespace, header.lenfreespace);
208 if ( write(db->fd, db->space, header.lenfreespace) != header.lenfreespace )
209 tlog(TL_CRIT|TL_EXIT,"FDBClose: write failed: %s", strerror(errno));
214 if ( lseek(db->fd,0,SEEK_SET)!=0 ||
215 write(db->fd, &header, sizeof(FDBHeader)) != sizeof(FDBHeader) ||
217 tlog(TL_CRIT|TL_EXIT,"FDBClose: header write failed: %s", strerror(errno));
229 readLen(FDB *db, off_t offset, size_t *size) {
230 if ( lseek(db->fd,offset,SEEK_SET)!=offset)
233 if ( read(db->fd,size,sizeof(size_t)) != sizeof(size_t) )
241 FDBDelete(FDB *db, off_t offset, size_t length) {
246 if ( readLen(db, offset, &length) != FDB_OK )
249 addFreeSpace(db, offset, length);
256 FDBGet(FDB *db, off_t offset, size_t length, FDBRecord **record) {
261 if ( offset < sizeof(FDBHeader) )
265 if ( readLen(db, offset, &length) != FDB_OK )
268 *record = (FDBRecord*)tmalloc( length );
270 if ( lseek(db->fd,offset,SEEK_SET)!=offset)
273 if ( (rc=read(db->fd,*record,length)) != length ) {
274 (*record)->length = rc;
275 tlog(TL_CRIT,"FDBGet: read (%d bytes) less than needed (%d bytes): %s", rc, length, strerror(errno));
276 return FDB_INCORRECT;
279 if ( (*record)->length != length ) {
280 tlog(TL_ALARM, "FDBGet: wrong length in opts: %d bytes and %d bytes really", length, (*record)->length);
281 if ( (*record)->length > length ) {
282 rc = (*record)->length;
284 return FDBGet(db, offset, rc, record);
293 FDBPut(FDB *db, FDBRecord *record, off_t *offset ) {
299 ptr = findFreeSpace( db, record->length );
301 *offset = ptr->offset;
302 ptr->length -= record->length;
303 if ( ptr->length == 0 ) {
304 if ( (ptr - db->space) + 1 != db->listcur )
305 memmove(ptr, ptr+1, (db->listcur - (ptr - db->space) + 1) * sizeof(FDBFreeSpace));
308 ptr->offset += record->length;
309 if ( lseek(db->fd, *offset, SEEK_SET) != *offset )
310 tlog(TL_CRIT|TL_EXIT,"FDBPut: lseek failed: %s", strerror(errno));
312 if ( (*offset = lseek(db->fd, 0, SEEK_END)) < 0 )
313 tlog(TL_CRIT|TL_EXIT,"FDBPut: lseek failed: %s", strerror(errno));
316 if ( write(db->fd, record, record->length) != record->length )
317 tlog(TL_CRIT|TL_EXIT,"FDBPut: write failed: %s", strerror(errno));