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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
#ifndef __ACL_VBUF_H_INCLUDED__
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#define __ACL_VBUF_H_INCLUDED__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "acl_define.h"
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typedef struct ACL_VBUF ACL_VBUF;
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typedef int (*ACL_VBUF_GET_READY_FN) (ACL_VBUF *);
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typedef int (*ACL_VBUF_PUT_READY_FN) (ACL_VBUF *);
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typedef int (*ACL_VBUF_SPACE_FN) (ACL_VBUF *, int);
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struct ACL_VBUF {
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int flags; /* status, see below */
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unsigned char *data; /* variable-length buffer */
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int len; /* buffer length */
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int cnt; /* bytes left to read/write */
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unsigned char *ptr; /* read/write position */
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ACL_VBUF_GET_READY_FN get_ready; /* read buffer empty action */
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ACL_VBUF_PUT_READY_FN put_ready; /* write buffer full action */
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ACL_VBUF_SPACE_FN space; /* request for buffer space */
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void *ctx;
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};
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/*
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* Typically, an application will embed a VBUF structure into a larger
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* structure that also contains application-specific members. This approach
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* gives us the best of both worlds. The application can still use the
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* generic VBUF primitives for reading and writing VBUFs. The macro below
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* transforms a pointer from VBUF structure to the structure that contains
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* it.
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*/
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#define ACL_VBUF_TO_APPL(vbuf_ptr,app_type,vbuf_member) \
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((app_type *) (((char *) (vbuf_ptr)) - offsetof(app_type,vbuf_member)))
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/*
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* Buffer status management.
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*/
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#define ACL_VBUF_FLAG_ERR (1<<0) /* some I/O error */
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#define ACL_VBUF_FLAG_EOF (1<<1) /* end of data */
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#define ACL_VBUF_FLAG_TIMEOUT (1<<2) /* timeout error */
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#define ACL_VBUF_FLAG_BAD (ACL_VBUF_FLAG_ERR | ACL_VBUF_FLAG_EOF | ACL_VBUF_FLAG_TIMEOUT)
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#define ACL_VBUF_FLAG_FIXED (1<<3) /* fixed-size buffer */
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#define acl_vbuf_error(v) ((v)->flags & ACL_VBUF_FLAG_ERR)
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#define acl_vbuf_eof(v) ((v)->flags & ACL_VBUF_FLAG_EOF)
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#define acl_vbuf_timeout(v) ((v)->flags & ACL_VBUF_FLAG_TIMEOUT)
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#define acl_vbuf_clearerr(v) ((v)->flags &= ~ACL_VBUF_FLAG_BAD)
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/*
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* Buffer I/O-like operations and results.
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*/
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#define ACL_VBUF_GET(v) ((v)->cnt < 0 ? ++(v)->cnt, \
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(int) *(v)->ptr++ : acl_vbuf_get(v))
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#define ACL_VBUF_PUT(v,c) ((v)->cnt > 0 ? --(v)->cnt, \
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(int) (*(v)->ptr++ = (c)) : acl_vbuf_put((v),(c)))
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#define ACL_VBUF_SPACE(v,n) ((v)->space((v),(n)))
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#define ACL_VBUF_CHARAT(v, offset) ((int) (v).data[offset])
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#define ACL_VBUF_EOF (-1) /* no more space or data */
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ACL_API int acl_vbuf_get(ACL_VBUF *);
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ACL_API int acl_vbuf_put(ACL_VBUF *, int);
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ACL_API int acl_vbuf_unget(ACL_VBUF *, int);
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ACL_API int acl_vbuf_read(ACL_VBUF *, char *, int);
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ACL_API int acl_vbuf_write(ACL_VBUF *, const char *, int);
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#ifdef __cplusplus
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}
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#endif
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#endif
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