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#include <bh/io.h>
#include <malloc.h>
#define BUFFER_SIZE (sizeof(char *))
struct bh_io_s
{
bh_io_func_t func;
};
bh_io_t *bh_io_new(bh_io_func_t func,
void *data)
{
size_t requested;
bh_io_t *io;
/* Get information about IO device size */
if (func(NULL, BH_IO_INFO_CB, &requested, NULL))
return NULL;
/* Allocate space for the IO device */
io = malloc(sizeof(*io) + requested);
if (!io)
return NULL;
/* Initialize IO device */
io->func = func;
if (func(io + 1, BH_IO_INIT_CB, data, NULL))
{
free(io);
return NULL;
}
return io;
}
void bh_io_free(bh_io_t *io)
{
/* Prevent working with NULL io */
if (!io)
return;
/* Call the IO device destruction handler */
io->func(io + 1, BH_IO_DESTROY_CB, NULL, NULL);
}
const char *bh_io_classname(bh_io_t *io)
{
const char *name;
if (!io)
goto error;
if (io->func(io + 1, BH_IO_INFO_CB, NULL, &name) != BH_OK)
goto error;
return name;
error:
return NULL;
}
int bh_io_open(bh_io_t *io,
int mode)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device open handler with specified mode */
return io->func(io + 1, BH_IO_OPEN_CB, &mode, NULL);
}
int bh_io_close(bh_io_t *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device close handler */
return io->func(io + 1, BH_IO_CLOSE_CB, NULL, NULL);
}
int bh_io_read(bh_io_t *io,
char *buffer,
size_t size,
size_t *actual)
{
int code;
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device read handler */
code = io->func(io + 1, BH_IO_READ_CB, buffer, &size);
/* If caller wants to know actual read size - report it back */
if (actual)
*actual = size;
return code;
}
int bh_io_write(bh_io_t *io,
const char *buffer,
size_t size,
size_t *actual)
{
int code;
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device write handler */
code = io->func(io + 1, BH_IO_WRITE_CB, (void *)buffer, &size);
/* If caller wants to know actual written size - report it back */
if (actual)
*actual = size;
return code;
}
int bh_io_peek(bh_io_t *io,
char *buffer,
size_t size,
size_t *actual)
{
int code;
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device peek handler */
code = io->func(io + 1, BH_IO_PEEK_CB, (void *)buffer, &size);
/* If caller wants to know actual written size - report it back */
if (actual)
*actual = size;
return code;
}
int bh_io_tell(bh_io_t *io,
int64_t *position)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device tell handler */
return io->func(io + 1, BH_IO_TELL_CB, position, NULL);
}
int bh_io_seek(bh_io_t *io,
int64_t position,
int direction)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device seek handler */
return io->func(io + 1, BH_IO_SEEK_CB, &position, &direction);
}
int bh_io_flush(bh_io_t *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device flush handler */
return io->func(io + 1, BH_IO_FLUSH_CB, NULL, NULL);
}
int bh_io_size(bh_io_t *io,
int64_t *size)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device size handler */
return io->func(io + 1, BH_IO_SIZE_CB, size, NULL);
}
int bh_io_flags(bh_io_t *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_IO_FLAG_ERROR;
/* Call the IO device flags handler */
return io->func(io + 1, BH_IO_FLAGS_CB, NULL, NULL);
}
int bh_io_clear(bh_io_t *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_OK;
/* Call the IO device clear error handler */
return io->func(io + 1, BH_IO_CLEAR_CB, NULL, NULL);
}
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