/*

 * io_manager.c --- the I/O manager abstraction

 */

#include "config.h"

#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_zeroout(io_channel channel, unsigned long long block,

			     unsigned long long count)

{

	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);

	if (channel->manager->zeroout)

		return (channel->manager->zeroout)(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);

}

errcode_t io_channel_cache_readahead(io_channel io, unsigned long long block,

				     unsigned long long count)

{

	if (!io->manager->cache_readahead)

		return EXT2_ET_OP_NOT_SUPPORTED;

	return io->manager->cache_readahead(io, block, count);

}