1 /*
2 * io_manager.c --- the I/O manager abstraction
3 */
4
5 #include <stdio.h>
6 #include <string.h>
7 #if HAVE_UNISTD_H
8 #include <unistd.h>
9 #endif
10 #include <fcntl.h>
11 #include <time.h>
12 #if HAVE_SYS_STAT_H
13 #include <sys/stat.h>
14 #endif
15 #if HAVE_SYS_TYPES_H
16 #include <sys/types.h>
17 #endif
18
19 #include "ext2_fs.h"
20 #include "ext2fs.h"
21
io_channel_set_options(io_channel channel,const char * opts)22 errcode_t io_channel_set_options(io_channel channel, const char *opts)
23 {
24 errcode_t retval = 0;
25 char *next, *ptr, *options, *arg;
26
27 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
28
29 if (!opts)
30 return 0;
31
32 if (!channel->manager->set_option)
33 return EXT2_ET_INVALID_ARGUMENT;
34
35 options = malloc(strlen(opts)+1);
36 if (!options)
37 return EXT2_ET_NO_MEMORY;
38 strcpy(options, opts);
39 ptr = options;
40
41 while (ptr && *ptr) {
42 next = strchr(ptr, '&');
43 if (next)
44 *next++ = 0;
45
46 arg = strchr(ptr, '=');
47 if (arg)
48 *arg++ = 0;
49
50 retval = (channel->manager->set_option)(channel, ptr, arg);
51 if (retval)
52 break;
53 ptr = next;
54 }
55 free(options);
56 return retval;
57 }
58
io_channel_write_byte(io_channel channel,unsigned long offset,int count,const void * data)59 errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
60 int count, const void *data)
61 {
62 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
63
64 if (channel->manager->write_byte)
65 return channel->manager->write_byte(channel, offset,
66 count, data);
67
68 return EXT2_ET_UNIMPLEMENTED;
69 }
70
io_channel_read_blk64(io_channel channel,unsigned long long block,int count,void * data)71 errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
72 int count, void *data)
73 {
74 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
75
76 if (channel->manager->read_blk64)
77 return (channel->manager->read_blk64)(channel, block,
78 count, data);
79
80 if ((block >> 32) != 0)
81 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
82
83 return (channel->manager->read_blk)(channel, (unsigned long) block,
84 count, data);
85 }
86
io_channel_write_blk64(io_channel channel,unsigned long long block,int count,const void * data)87 errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block,
88 int count, const void *data)
89 {
90 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
91
92 if (channel->manager->write_blk64)
93 return (channel->manager->write_blk64)(channel, block,
94 count, data);
95
96 if ((block >> 32) != 0)
97 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
98
99 return (channel->manager->write_blk)(channel, (unsigned long) block,
100 count, data);
101 }
102
io_channel_discard(io_channel channel,unsigned long long block,unsigned long long count)103 errcode_t io_channel_discard(io_channel channel, unsigned long long block,
104 unsigned long long count)
105 {
106 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
107
108 if (channel->manager->discard)
109 return (channel->manager->discard)(channel, block, count);
110
111 return EXT2_ET_UNIMPLEMENTED;
112 }
113
io_channel_alloc_buf(io_channel io,int count,void * ptr)114 errcode_t io_channel_alloc_buf(io_channel io, int count, void *ptr)
115 {
116 size_t size;
117
118 if (count == 0)
119 size = io->block_size;
120 else if (count > 0)
121 size = io->block_size * count;
122 else
123 size = -count;
124
125 if (io->align)
126 return ext2fs_get_memalign(size, io->align, ptr);
127 else
128 return ext2fs_get_mem(size, ptr);
129 }
130