2 * lmo - Lua Machine Objects - Base functions
4 * Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
21 extern char _lmo_error
[1024];
23 static int lmo_read32( int fd
, uint32_t *val
)
27 if( read(fd
, buffer
, 4) < 4 )
31 *val
= ntohl(*((uint32_t *) buffer
));
36 static char * error(const char *message
, int add_errno
)
38 memset(_lmo_error
, 0, sizeof(_lmo_error
));
41 snprintf(_lmo_error
, sizeof(_lmo_error
),
42 "%s: %s", message
, strerror(errno
));
44 snprintf(_lmo_error
, sizeof(_lmo_error
), "%s", message
);
49 const char * lmo_error(void)
54 lmo_archive_t
* lmo_open(const char *file
)
57 uint32_t idx_offset
= 0;
61 lmo_archive_t
*ar
= NULL
;
62 lmo_entry_t
*head
= NULL
;
63 lmo_entry_t
*entry
= NULL
;
65 if( stat(file
, &s
) == -1 )
67 error("Can not stat file", 1);
71 if( (in
= open(file
, O_RDONLY
)) == -1 )
73 error("Can not open file", 1);
77 if( lseek(in
, -sizeof(uint32_t), SEEK_END
) == -1 )
79 error("Can not seek to eof", 1);
83 if( lmo_read32(in
, &idx_offset
) != 4 )
85 error("Unexpected EOF while reading index offset", 0);
89 if( lseek(in
, idx_offset
, SEEK_SET
) == -1 )
91 error("Can not seek to index offset", 1);
95 if( (ar
= (lmo_archive_t
*) malloc(sizeof(lmo_archive_t
))) != NULL
)
98 ar
->length
= idx_offset
;
101 i
< (s
.st_size
- sizeof(uint32_t));
102 i
+= (4 * sizeof(uint32_t))
104 if( (entry
= (lmo_entry_t
*) malloc(sizeof(lmo_entry_t
))) != NULL
)
106 if( (lmo_read32(ar
->fd
, &entry
->key_id
) == 4) &&
107 (lmo_read32(ar
->fd
, &entry
->val_id
) == 4) &&
108 (lmo_read32(ar
->fd
, &entry
->offset
) == 4) &&
109 (lmo_read32(ar
->fd
, &entry
->length
) == 4)
116 error("Unexpected EOF while reading index entry", 0);
122 error("Out of memory", 0);
129 if( lseek(ar
->fd
, 0, SEEK_SET
) == -1 )
131 error("Can not seek to start", 1);
135 if( (ar
->mmap
= mmap(NULL
, ar
->length
, PROT_READ
, MAP_SHARED
, ar
->fd
, 0)) == MAP_FAILED
)
137 error("Failed to memory map archive contents", 1);
145 error("Out of memory", 0);
159 while( entry
!= NULL
)
171 if( (ar
->mmap
!= NULL
) && (ar
->mmap
!= MAP_FAILED
) )
172 munmap(ar
->mmap
, ar
->length
);
181 void lmo_close(lmo_archive_t
*ar
)
183 lmo_entry_t
*head
= NULL
;
184 lmo_entry_t
*entry
= NULL
;
190 while( entry
!= NULL
)
199 if( (ar
->mmap
!= NULL
) && (ar
->mmap
!= MAP_FAILED
) )
200 munmap(ar
->mmap
, ar
->length
);
209 int lmo_lookup(lmo_archive_t
*ar
, const char *key
, char *dest
, int len
)
211 uint32_t look_key
= sfh_hash(key
, strlen(key
));
214 lmo_entry_t
*entry
= ar
->index
;
216 while( entry
!= NULL
)
218 if( entry
->key_id
== look_key
)
220 copy_len
= (len
> entry
->length
) ? entry
->length
: len
;
221 memcpy(dest
, &ar
->mmap
[entry
->offset
], copy_len
);