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#include <BH/IO.h>
#include <malloc.h>
#define BUFFER_SIZE (sizeof(char *))
struct BH_IO
{
BH_IOCallback cb;
};
BH_IO *BH_IONew(BH_IOCallback cb,
void *data)
{
size_t requested;
BH_IO *io;
/* Get information about IO device size */
if (cb(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->cb = cb;
if (cb(io + 1, BH_IO_INIT_CB, data, NULL))
{
free(io);
return NULL;
}
return io;
}
void BH_IOFree(BH_IO *io)
{
/* Prevent working with NULL io */
if (!io)
return;
/* Call the IO device destruction handler */
io->cb(io + 1, BH_IO_DESTROY_CB, NULL, NULL);
/* Deallocate object */
free(io);
}
const char *BH_IOClassname(BH_IO *io)
{
const char *name;
if (!io)
goto error;
if (io->cb(io + 1, BH_IO_INFO_CB, NULL, &name) != BH_OK)
goto error;
return name;
error:
return NULL;
}
int BH_IOOpen(BH_IO *io,
int mode)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device open handler with specified mode */
return io->cb(io + 1, BH_IO_OPEN_CB, &mode, NULL);
}
int BH_IOClose(BH_IO *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device close handler */
return io->cb(io + 1, BH_IO_CLOSE_CB, NULL, NULL);
}
int BH_IORead(BH_IO *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->cb(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_IOWrite(BH_IO *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->cb(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_IOPeek(BH_IO *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->cb(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_IOTell(BH_IO *io,
int64_t *position)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device tell handler */
return io->cb(io + 1, BH_IO_TELL_CB, position, NULL);
}
int BH_IOSeek(BH_IO *io,
int64_t position,
int direction)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device seek handler */
return io->cb(io + 1, BH_IO_SEEK_CB, &position, &direction);
}
int BH_IOFlush(BH_IO *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device flush handler */
return io->cb(io + 1, BH_IO_FLUSH_CB, NULL, NULL);
}
int BH_IOSize(BH_IO *io,
int64_t *size)
{
/* Prevent working with NULL io */
if (!io)
return BH_ERROR;
/* Call the IO device size handler */
return io->cb(io + 1, BH_IO_SIZE_CB, size, NULL);
}
int BH_IOFlags(BH_IO *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_IO_FLAG_ERROR;
/* Call the IO device flags handler */
return io->cb(io + 1, BH_IO_FLAGS_CB, NULL, NULL);
}
int BH_IOClear(BH_IO *io)
{
/* Prevent working with NULL io */
if (!io)
return BH_OK;
/* Call the IO device clear error handler */
return io->cb(io + 1, BH_IO_CLEAR_CB, NULL, NULL);
}
BH_IO *BH_BufferNew(BH_IO *io)
{
(void)io;
return NULL;
}
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