/*
* EwfSize
*/
static int EwfSize(void *p_handle, uint64_t *p_size) {
pts_EwfHandle p_ewf_handle=(pts_EwfHandle)p_handle;
#ifdef HAVE_LIBEWF_V2_API
if(libewf_handle_get_media_size(p_ewf_handle->h_ewf,p_size,NULL)!=1) {
#else
if(libewf_get_media_size(p_ewf_handle->h_ewf,p_size)!=1) {
#endif
return EWF_GET_SIZE_FAILED;
}
return EWF_OK;
}
/*
* EwfRead
*/
static int EwfRead(void *p_handle,
char *p_buf,
off_t offset,
size_t count,
size_t *p_read,
int *p_errno)
{
pts_EwfHandle p_ewf_handle=(pts_EwfHandle)p_handle;
// TODO: Return value of libewf_handle_read_buffer is ssize_t with -1 on error
size_t bytes_read;
#ifdef HAVE_LIBEWF_V2_API
if(libewf_handle_seek_offset(p_ewf_handle->h_ewf,
offset,
SEEK_SET,
NULL)!=-1)
#else
if(libewf_seek_offset(p_ewf_handle->h_ewf,offset)!=-1)
#endif
{
#ifdef HAVE_LIBEWF_V2_API
bytes_read=libewf_handle_read_buffer(p_ewf_handle->h_ewf,
p_buf,
count,
NULL);
#else
bytes_read=libewf_read_buffer(p_ewf_handle->h_ewf,p_buf,count);
#endif
if(bytes_read!=count) return EWF_READ_FAILED;
} else {
return EWF_SEEK_FAILED;
}
*p_read=bytes_read;
return EWF_OK;
}
/* Reads media data from an offset into a buffer
* This function swaps byte pairs if specified
* Returns the amount of bytes read, or -1 on error
*/
ssize_t libewf_read_random( LIBEWF_HANDLE *handle, void *buffer, size_t size, off_t offset )
{
ssize_t read_count = 0;
if( libewf_seek_offset( handle, offset ) == -1 )
{
LIBEWF_WARNING_PRINT( "libewf_read_random: unable to seek offset.\n" );
return( -1 );
}
read_count = libewf_read_buffer( handle, buffer, size );
if( read_count <= -1 )
{
LIBEWF_WARNING_PRINT( "libewf_read_random: unable to read buffer.\n" );
return( -1 );
}
return( read_count );
}
static ut64 ewf__lseek(RIO *io, RIODesc *fd, ut64 offset, int whence) {
if (RIOEWF_IS_VALID (fd)) {
size64_t media_size;
switch (whence) {
case SEEK_SET:
/* ignore */
break;
case SEEK_CUR:
offset += io->seek;
break;
case SEEK_END:
libewf_get_media_size (RIOEWF_HANDLE (fd), &media_size);
offset = media_size - offset;
break;
}
libewf_seek_offset (RIOEWF_HANDLE (fd), offset);
return offset;
}
return (ut64)-1;
}
ut64 ewf_lseek(int fildes, ut64 offset, int whence)
{
size64_t media_size;
if (fildes == ewf_fd) {
switch(whence) {
case SEEK_SET:
/* ignore */
break;
case SEEK_CUR:
offset += config.seek;
break;
case SEEK_END:
libewf_get_media_size(ewf_h, &media_size);
offset = media_size - offset;
break;
}
libewf_seek_offset(ewf_h, offset);
return offset;
}
return lseek(fildes, offset, whence);
}
