| /* |
| * io_manager.c --- the I/O manager abstraction |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <fcntl.h> |
| #include <time.h> |
| #if HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #if HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #include "ext2_fs.h" |
| #include "ext2fs.h" |
| |
| errcode_t io_channel_set_options(io_channel channel, const char *opts) |
| { |
| errcode_t retval = 0; |
| char *next, *ptr, *options, *arg; |
| |
| EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| |
| if (!opts) |
| return 0; |
| |
| if (!channel->manager->set_option) |
| return EXT2_ET_INVALID_ARGUMENT; |
| |
| options = malloc(strlen(opts)+1); |
| if (!options) |
| return EXT2_ET_NO_MEMORY; |
| strcpy(options, opts); |
| ptr = options; |
| |
| while (ptr && *ptr) { |
| next = strchr(ptr, '&'); |
| if (next) |
| *next++ = 0; |
| |
| arg = strchr(ptr, '='); |
| if (arg) |
| *arg++ = 0; |
| |
| retval = (channel->manager->set_option)(channel, ptr, arg); |
| if (retval) |
| break; |
| ptr = next; |
| } |
| free(options); |
| return retval; |
| } |
| |
| errcode_t io_channel_write_byte(io_channel channel, unsigned long offset, |
| int count, const void *data) |
| { |
| EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| |
| if (channel->manager->write_byte) |
| return channel->manager->write_byte(channel, offset, |
| count, data); |
| |
| return EXT2_ET_UNIMPLEMENTED; |
| } |
| |
| errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block, |
| int count, void *data) |
| { |
| EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| |
| if (channel->manager->read_blk64) |
| return (channel->manager->read_blk64)(channel, block, |
| count, data); |
| |
| if ((block >> 32) != 0) |
| return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64; |
| |
| return (channel->manager->read_blk)(channel, (unsigned long) block, |
| count, data); |
| } |
| |
| errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block, |
| int count, const void *data) |
| { |
| EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| |
| if (channel->manager->write_blk64) |
| return (channel->manager->write_blk64)(channel, block, |
| count, data); |
| |
| if ((block >> 32) != 0) |
| return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64; |
| |
| return (channel->manager->write_blk)(channel, (unsigned long) block, |
| count, data); |
| } |
| |
| errcode_t io_channel_discard(io_channel channel, unsigned long long block, |
| unsigned long long count) |
| { |
| EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| |
| if (channel->manager->discard) |
| return (channel->manager->discard)(channel, block, count); |
| |
| return EXT2_ET_UNIMPLEMENTED; |
| } |
| |
| errcode_t io_channel_alloc_buf(io_channel io, int count, void *ptr) |
| { |
| size_t size; |
| |
| if (count == 0) |
| size = io->block_size; |
| else if (count > 0) |
| size = io->block_size * count; |
| else |
| size = -count; |
| |
| if (io->align) |
| return ext2fs_get_memalign(size, io->align, ptr); |
| else |
| return ext2fs_get_mem(size, ptr); |
| } |