138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/*
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* nghttp2 - HTTP/2.0 C Library
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*
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* Copyright (c) 2014 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_BUF_H
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#define NGHTTP2_BUF_H
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
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#include "nghttp2_int.h"
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typedef struct {
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/* This points to the beginning of the buffer. The effective range
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of buffer is [begin, end). */
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uint8_t *begin;
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/* This points to the memory one byte beyond the end of the
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buffer. */
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uint8_t *end;
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/* The position indicator for effective start of the buffer. pos <=
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last must be hold. */
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uint8_t *pos;
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/* The position indicator for effective one beyond of the end of the
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buffer. last <= end must be hold. */
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uint8_t *last;
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/* Mark arbitrary position in buffer [begin, end) */
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uint8_t *mark;
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} nghttp2_buf;
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#define nghttp2_buf_len(BUF) ((BUF)->last - (BUF)->pos)
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#define nghttp2_buf_avail(BUF) ((BUF)->end - (BUF)->last)
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#define nghttp2_buf_cap(BUF) ((BUF)->end - (BUF)->begin)
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#define nghttp2_buf_pos_offset(BUF) ((BUF)->pos - (BUF)->begin)
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#define nghttp2_buf_last_offset(BUF) ((BUF)->last - (BUF)->begin)
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#define nghttp2_buf_shift_right(BUF, AMT) \
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do { \
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(BUF)->pos += AMT; \
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(BUF)->last += AMT; \
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} while(0)
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#define nghttp2_buf_shift_left(BUF, AMT) \
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do { \
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(BUF)->pos -= AMT; \
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(BUF)->last -= AMT; \
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} while(0)
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/*
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* Initializes the |buf|. No memory is allocated in this function. Use
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* nghttp2_buf_reserve() or nghttp2_buf_reserve2() to allocate memory.
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*/
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void nghttp2_buf_init(nghttp2_buf *buf);
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/*
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* Initializes the |buf| and allocates at least |initial| bytes of
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* memory.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_buf_init2(nghttp2_buf *buf, size_t initial);
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/*
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* Frees buffer in |buf|.
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*/
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void nghttp2_buf_free(nghttp2_buf *buf);
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/*
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* Extends buffer so that nghttp2_buf_cap() returns at least
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* |new_cap|. If extensions took place, buffer pointers in |buf| will
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* change.
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*
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* This function returns 0 if it succeeds, or one of the followings
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_buf_reserve(nghttp2_buf *buf, size_t new_cap);
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/*
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* This function behaves like nghttp2_buf_reserve(), but new capacity
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* is calculated as nghttp2_buf_pos_offset(buf) + new_rel_cap. In
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* other words, this function reserves memory at least |new_rel_cap|
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* bytes from buf->pos.
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*/
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int nghttp2_buf_pos_reserve(nghttp2_buf *buf, size_t new_rel_cap);
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/*
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* This function behaves like nghttp2_buf_reserve(), but new capacity
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* is calculated as nghttp2_buf_last_offset(buf) + new_rel_cap. In
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* other words, this function reserves memory at least |new_rel_cap|
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* bytes from buf->last.
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*/
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int nghttp2_buf_last_reserve(nghttp2_buf *buf, size_t new_rel_cap);
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/*
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* Resets pos, last, mark member of |buf| to buf->begin.
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*/
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void nghttp2_buf_reset(nghttp2_buf *buf);
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/*
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* Initializes |buf| using supplied buffer |begin| of length
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* |len|. Semantically, the application should not call *_reserve() or
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* nghttp2_free() functions for |buf|.
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*/
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void nghttp2_buf_wrap_init(nghttp2_buf *buf, uint8_t *begin, size_t len);
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#endif /* NGHTTP2_BUF_H */
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