413 lines
14 KiB
C
413 lines
14 KiB
C
/*
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* nghttp2 - HTTP/2 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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#include "nghttp2_mem.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) ((size_t)((BUF)->last - (BUF)->pos))
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#define nghttp2_buf_avail(BUF) ((size_t)((BUF)->end - (BUF)->last))
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#define nghttp2_buf_mark_avail(BUF) ((size_t)((BUF)->mark - (BUF)->last))
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#define nghttp2_buf_cap(BUF) ((size_t)((BUF)->end - (BUF)->begin))
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#define nghttp2_buf_pos_offset(BUF) ((size_t)((BUF)->pos - (BUF)->begin))
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#define nghttp2_buf_last_offset(BUF) ((size_t)((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() 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, nghttp2_mem *mem);
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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, nghttp2_mem *mem);
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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 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_reserve(nghttp2_buf *buf, size_t new_cap, nghttp2_mem *mem);
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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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struct nghttp2_buf_chain;
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typedef struct nghttp2_buf_chain nghttp2_buf_chain;
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/* Chains 2 buffers */
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struct nghttp2_buf_chain {
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/* Points to the subsequent buffer. NULL if there is no such
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buffer. */
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nghttp2_buf_chain *next;
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nghttp2_buf buf;
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};
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typedef struct {
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/* Points to the first buffer */
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nghttp2_buf_chain *head;
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/* Buffer pointer where write occurs. */
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nghttp2_buf_chain *cur;
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/* Memory allocator */
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nghttp2_mem *mem;
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/* The buffer capacity of each buf. This field may be 0 if
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nghttp2_bufs is initialized by nghttp2_bufs_wrap_init* family
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functions. */
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size_t chunk_length;
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/* The maximum number of nghttp2_buf_chain */
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size_t max_chunk;
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/* The number of nghttp2_buf_chain allocated */
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size_t chunk_used;
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/* The number of nghttp2_buf_chain to keep on reset */
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size_t chunk_keep;
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/* pos offset from begin in each buffers. On initialization and
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reset, buf->pos and buf->last are positioned at buf->begin +
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offset. */
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size_t offset;
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} nghttp2_bufs;
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/*
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* This is the same as calling nghttp2_bufs_init2 with the given
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* arguments and offset = 0.
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*/
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int nghttp2_bufs_init(nghttp2_bufs *bufs, size_t chunk_length, size_t max_chunk,
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nghttp2_mem *mem);
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/*
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* This is the same as calling nghttp2_bufs_init3 with the given
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* arguments and chunk_keep = max_chunk.
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*/
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int nghttp2_bufs_init2(nghttp2_bufs *bufs, size_t chunk_length,
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size_t max_chunk, size_t offset, nghttp2_mem *mem);
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/*
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* Initializes |bufs|. Each buffer size is given in the
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* |chunk_length|. The maximum number of buffers is given in the
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* |max_chunk|. On reset, first |chunk_keep| buffers are kept and
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* remaining buffers are deleted. Each buffer will have bufs->pos and
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* bufs->last shifted to left by |offset| bytes on creation and reset.
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*
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* This function allocates first buffer. bufs->head and bufs->cur
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* will point to the first buffer after this call.
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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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* NGHTTP2_ERR_INVALID_ARGUMENT
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* chunk_keep is 0; or max_chunk < chunk_keep; or offset is too
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* long.
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*/
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int nghttp2_bufs_init3(nghttp2_bufs *bufs, size_t chunk_length,
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size_t max_chunk, size_t chunk_keep, size_t offset,
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nghttp2_mem *mem);
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/*
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* Frees any related resources to the |bufs|.
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*/
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void nghttp2_bufs_free(nghttp2_bufs *bufs);
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/*
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* Initializes |bufs| using supplied buffer |begin| of length |len|.
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* The first buffer bufs->head uses buffer |begin|. The buffer size
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* is fixed and no extra chunk buffer is allocated. In other
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* words, max_chunk = chunk_keep = 1. To free the resource allocated
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* for |bufs|, use nghttp2_bufs_wrap_free().
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*
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* Don't use the function which performs allocation, such as
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* nghttp2_bufs_realloc().
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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_bufs_wrap_init(nghttp2_bufs *bufs, uint8_t *begin, size_t len,
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nghttp2_mem *mem);
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/*
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* Initializes |bufs| using supplied |veclen| size of buf vector
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* |vec|. The number of buffers is fixed and no extra chunk buffer is
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* allocated. In other words, max_chunk = chunk_keep = |in_len|. To
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* free the resource allocated for |bufs|, use
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* nghttp2_bufs_wrap_free().
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*
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* Don't use the function which performs allocation, such as
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* nghttp2_bufs_realloc().
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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_bufs_wrap_init2(nghttp2_bufs *bufs, const nghttp2_vec *vec,
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size_t veclen, nghttp2_mem *mem);
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/*
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* Frees any related resource to the |bufs|. This function does not
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* free supplied buffer provided in nghttp2_bufs_wrap_init().
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*/
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void nghttp2_bufs_wrap_free(nghttp2_bufs *bufs);
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/*
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* Reallocates internal buffer using |chunk_length|. The max_chunk,
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* chunk_keep and offset do not change. After successful allocation
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* of new buffer, previous buffers are deallocated without copying
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* anything into new buffers. chunk_used is reset to 1.
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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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* NGHTTP2_ERR_INVALID_ARGUMENT
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* chunk_length < offset
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*/
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int nghttp2_bufs_realloc(nghttp2_bufs *bufs, size_t chunk_length);
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/*
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* Appends the |data| of length |len| to the |bufs|. The write starts
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* at bufs->cur->buf.last. A new buffers will be allocated to store
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* all data.
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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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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_bufs_add(nghttp2_bufs *bufs, const void *data, size_t len);
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/*
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* Appends a single byte |b| to the |bufs|. The write starts at
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* bufs->cur->buf.last. A new buffers will be allocated to store all
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* data.
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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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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_bufs_addb(nghttp2_bufs *bufs, uint8_t b);
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/*
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* Behaves like nghttp2_bufs_addb(), but this does not update
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* buf->last pointer.
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*/
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int nghttp2_bufs_addb_hold(nghttp2_bufs *bufs, uint8_t b);
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#define nghttp2_bufs_fast_addb(BUFS, B) \
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do { \
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*(BUFS)->cur->buf.last++ = B; \
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} while (0)
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#define nghttp2_bufs_fast_addb_hold(BUFS, B) \
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do { \
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*(BUFS)->cur->buf.last = B; \
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} while (0)
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/*
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* Performs bitwise-OR of |b| at bufs->cur->buf.last. A new buffers
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* will be allocated if necessary.
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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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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_bufs_orb(nghttp2_bufs *bufs, uint8_t b);
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/*
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* Behaves like nghttp2_bufs_orb(), but does not update buf->last
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* pointer.
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*/
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int nghttp2_bufs_orb_hold(nghttp2_bufs *bufs, uint8_t b);
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#define nghttp2_bufs_fast_orb(BUFS, B) \
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do { \
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uint8_t **p = &(BUFS)->cur->buf.last; \
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**p = (uint8_t)(**p | (B)); \
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++(*p); \
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} while (0)
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#define nghttp2_bufs_fast_orb_hold(BUFS, B) \
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do { \
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uint8_t *p = (BUFS)->cur->buf.last; \
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*p = (uint8_t)(*p | (B)); \
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} while (0)
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/*
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* Copies all data stored in |bufs| to the contiguous buffer. This
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* function allocates the contiguous memory to store all data in
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* |bufs| and assigns it to |*out|.
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*
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* The contents of |bufs| is left unchanged.
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*
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* This function returns the length of copied data and assigns the
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* pointer to copied data to |*out| if it succeeds, or one of the
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* following 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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ssize_t nghttp2_bufs_remove(nghttp2_bufs *bufs, uint8_t **out);
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/*
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* Copies all data stored in |bufs| to |out|. This function assumes
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* that the buffer space pointed by |out| has at least
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* nghttp2_bufs(bufs) bytes.
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*
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* The contents of |bufs| is left unchanged.
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*
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* This function returns the length of copied data.
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*/
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size_t nghttp2_bufs_remove_copy(nghttp2_bufs *bufs, uint8_t *out);
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/*
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* Resets |bufs| and makes the buffers empty.
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*/
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void nghttp2_bufs_reset(nghttp2_bufs *bufs);
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/*
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* Moves bufs->cur to bufs->cur->next. If resulting bufs->cur is
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* NULL, this function allocates new buffers and bufs->cur points to
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* it.
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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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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_bufs_advance(nghttp2_bufs *bufs);
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/* Sets bufs->cur to bufs->head */
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#define nghttp2_bufs_rewind(BUFS) \
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do { \
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(BUFS)->cur = (BUFS)->head; \
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} while (0)
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/*
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* Move bufs->cur, from the current position, using next member, to
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* the last buf which has nghttp2_buf_len(buf) > 0 without seeing buf
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* which satisfies nghttp2_buf_len(buf) == 0. If
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* nghttp2_buf_len(&bufs->cur->buf) == 0 or bufs->cur->next is NULL,
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* bufs->cur is unchanged.
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*/
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void nghttp2_bufs_seek_last_present(nghttp2_bufs *bufs);
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/*
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* Returns nonzero if bufs->cur->next is not empty.
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*/
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int nghttp2_bufs_next_present(nghttp2_bufs *bufs);
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#define nghttp2_bufs_cur_avail(BUFS) nghttp2_buf_avail(&(BUFS)->cur->buf)
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/*
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* Returns the total buffer length of |bufs|.
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*/
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size_t nghttp2_bufs_len(nghttp2_bufs *bufs);
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#endif /* NGHTTP2_BUF_H */
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