VDMAD_Copy_From

VDMAD_Copy_From_Buffer

include vdmad.inc

mov ebx, BufferID
mov esi, OFFSET32 Region
mov edi, OFFSET32 BufferOffset
mov ecx, BufferSize
VxDcall VDMAD_Copy_From_Buffer
jc ErrorHandler

Allows another device to copy data from the VDMAD buffer to the DMA region associated with that buffer. Uses EAX, flags

The carry flag is clear if the data if the function succeeds. Otherwise, the carry flag is set and the AL register contains one of the following error values:

0Ah	DMA_Invalid_Buffer: invalid buffer ID supplied.
0Bh	DMA_Copy_Out_Range: (ESI + ECX) is greater than buffer size.

BufferID

Buffer identifier.

Region

Address of linear region.

BufferOffset

Offset within the buffer to the start of copying.

BufferSize

Buffer size in bytes.

This service is called after the VDMAD_Request_Buffer service, after a memory write transfer and before the VDMAD_Release_Buffer service.