Method CopyToRam

Source/Core/ROMBuffer.cpp:445–487

//
//*****************************************************************************
void RomBuffer::CopyToRam( u8 * p_dst, u32 dst_offset, u32 dst_size, u32 src_offset, u32 length )
{
	if( sRomFixed )
	{
		const u8 *	p_src( (const u8 *)spRomData );
		u32			src_size( sRomSize );

		DMA_HandleTransfer( p_dst, dst_offset, dst_size, p_src, src_offset, src_size, length );
	}
	else
	{
		while(length > 0)
		{
			u8 *	p_chunk_base {};
			u32		chunk_offset {};
			u32		chunk_size {};

			if( !spRomFileCache->GetChunk( src_offset, &p_chunk_base, &chunk_offset, &chunk_size ) )
			{
				// Out of range
				break;
			}

			// Calculate how many bytes we can transfer this pass
			u32		offset_into_chunk( src_offset - chunk_offset );
			u32		bytes_remaining_in_chunk( chunk_size - offset_into_chunk );
			u32		bytes_this_pass( Min( length, bytes_remaining_in_chunk ) );
			#ifdef DAEDALUS_ENABLE_ASSERTS
			DAEDALUS_ASSERT( s32( bytes_this_pass ) > 0, "How come we're trying to copy <= 0 bytes across?" );
			#endif
			// Copy this chunk across
			if( !DMA_HandleTransfer( p_dst, dst_offset, dst_size, p_chunk_base, offset_into_chunk, chunk_size, bytes_this_pass  ) )
			{
				break;
			}

			// Update the src/dst pointers and reduce length by the number of copied bytes
			dst_offset += bytes_this_pass;
			src_offset += bytes_this_pass;
			length -= bytes_this_pass;
		}
	}
}

//*****************************************************************************
//