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-rw-r--r--lib/ext2fs/io_manager.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/lib/ext2fs/io_manager.c b/lib/ext2fs/io_manager.c
new file mode 100644
index 0000000..dca6af0
--- /dev/null
+++ b/lib/ext2fs/io_manager.c
@@ -0,0 +1,152 @@
+/*
+ * 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 > 0) {
+ if ((unsigned) io->align > size)
+ size = 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);
+}