1 /** 2 * 3 * TODO: description 4 * 5 * This file is a part of USB SCSI CAM for Haiku. 6 * May be used under terms of the MIT License 7 * 8 * Author(s): 9 * Siarzhuk Zharski <imker@gmx.li> 10 * 11 * 12 */ 13 /** handling SCSI data-buffer (both usual "plain" and scatter/gather ones) */ 14 15 #ifndef _SG_BUFFER_H_ 16 #define _SG_BUFFER_H_ 17 18 #ifndef _IOVEC_H 19 #include <iovec.h> 20 #endif/*_IOVEC_H*/ 21 22 /** 23 \struct:_sg_buffer 24 */ 25 typedef struct _sg_buffer{ 26 iovec iov; /**< to avoid extra memory allocations */ 27 iovec *piov; /**< ptr to scatter/gather list, default is equal to &iov */ 28 int count; /**< count of scatter/gather vector entries */ 29 bool b_own; /**< was allocated - must be freed */ 30 } sg_buffer; 31 32 #define member_offset(__type, __member) ((size_t)&(((__type *)0)->__member)) 33 #define member_size(__type, __member) sizeof(((__type *)0)->__member) 34 35 status_t init_sg_buffer(sg_buffer *sgb, CCB_SCSIIO *ccbio); 36 status_t realloc_sg_buffer(sg_buffer *sgb, size_t size); 37 status_t sg_buffer_len(sg_buffer *sgb, size_t *size); 38 status_t sg_access_byte(sg_buffer *sgb, off_t offset, uchar *byte, bool b_set); 39 status_t sg_memcpy(sg_buffer *dest_sgb, off_t dest_offset, 40 sg_buffer *src_sgb, off_t src_offset, size_t size); 41 void free_sg_buffer(sg_buffer *sgb); 42 43 #endif /*_SG_BUFFER_H_*/ 44 45