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#include <BH/IO.h>
#include <stdlib.h>
#define BUFFER_SIZE (sizeof(char *))
void BH_IOFree(BH_IO *device)
{
/* Prevent working with NULL io */
if (!device)
return;
/* Call the IO device destruction handler and deallocate */
device->callback(device, BH_IO_OP_DESTROY, NULL);
}
int BH_IORead(BH_IO *device,
char *buffer,
size_t size,
size_t *actual)
{
BH_IOReadInfo info;
/* Prevent working with NULL io */
if (!device)
return BH_ERROR;
info.data = buffer;
info.size = size;
info.actual = actual;
return device->callback(device, BH_IO_OP_READ, &info);
}
int BH_IOWrite(BH_IO *device,
const char *buffer,
size_t size,
size_t *actual)
{
BH_IOWriteInfo info;
/* Prevent working with NULL io */
if (!device)
return BH_ERROR;
info.data = buffer;
info.size = size;
info.actual = actual;
return device->callback(device, BH_IO_OP_WRITE, &info);
}
int BH_IOCtl(BH_IO *device,
int op,
void *arg)
{
BH_IOCtlInfo info;
if (!device)
return BH_ERROR;
info.op = op;
info.arg = arg;
return device->callback(device, BH_IO_OP_CTL, &info);
}
int BH_IOCap(BH_IO *device,
int op)
{
if (!device)
return BH_ERROR;
return device->callback(device, BH_IO_OP_CAP, &op);
}
int BH_IOPeek(BH_IO *device,
char *buffer,
size_t size,
size_t *actual)
{
BH_IOReadInfo readInfo;
BH_IOSeekInfo posInfo;
size_t readed;
readInfo.data = buffer;
readInfo.size = size;
readInfo.actual = actual;
if (BH_IOCap(device, BH_IO_CTL_PEEK))
{
if (BH_IOCap(device, BH_IO_CTL_SEEK))
return BH_NOIMPL;
if (BH_IORead(device, buffer, size, &readed))
return BH_ERROR;
posInfo.whence = BH_IO_SEEK_CUR;
posInfo.offset = -(int64_t)readed;
if (BH_IOCtl(device, BH_IO_CTL_SEEK, &posInfo))
return BH_ERROR;
if (actual)
*actual = readed;
return BH_OK;
}
return BH_IOCtl(device, BH_IO_CTL_PEEK, &readInfo);
}
int BH_IOTell(BH_IO *device,
int64_t *offset)
{
return BH_IOCtl(device, BH_IO_CTL_TELL, offset);
}
int BH_IOSeek(BH_IO *device,
int64_t offset,
int whence)
{
BH_IOSeekInfo info;
info.offset = offset;
info.whence = whence;
return BH_IOCtl(device, BH_IO_CTL_SEEK, &info);
}
int BH_IOFlush(BH_IO *device)
{
return BH_IOCtl(device, BH_IO_CTL_FLUSH, NULL);
}
int BH_IOSize(BH_IO *device,
int64_t *size)
{
return BH_IOCtl(device, BH_IO_CTL_SIZE, size);
}
int BH_IOFlags(BH_IO *device, int *flags)
{
return BH_IOCtl(device, BH_IO_CTL_FLAGS, flags);
}
int BH_IOClear(BH_IO *device)
{
return BH_IOCtl(device, BH_IO_CTL_CLEAR, NULL);
}
int BH_IOError(BH_IO *device)
{
int flags;
if (BH_IOFlags(device, &flags))
return BH_ERROR;
return flags & BH_IO_FLAG_ERROR;
}
int BH_IOEndOfFile(BH_IO *device)
{
int flags;
if (BH_IOFlags(device, &flags))
return BH_ERROR;
return flags & BH_IO_FLAG_EOF;
}
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