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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#ifndef _NGX_BUF_H_INCLUDED_
#define _NGX_BUF_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
typedef void * ngx_buf_tag_t;
typedef struct ngx_buf_s ngx_buf_t;
struct ngx_buf_s {
u_char *pos;
u_char *last;
off_t file_pos;
off_t file_last;
u_char *start; /* start of buffer */
u_char *end; /* end of buffer */
ngx_buf_tag_t tag;
ngx_file_t *file;
ngx_buf_t *shadow;
/* the buf's content could be changed */
unsigned temporary:1;
/*
* the buf's content is in a memory cache or in a read only memory
* and must not be changed
*/
unsigned memory:1;
/* the buf's content is mmap()ed and must not be changed */
unsigned mmap:1;
unsigned recycled:1;
unsigned in_file:1;
unsigned flush:1;
unsigned sync:1;
unsigned last_buf:1;
unsigned last_in_chain:1;
unsigned last_shadow:1;
unsigned temp_file:1;
/* STUB */ int num;
};
struct ngx_chain_s {
ngx_buf_t *buf;
ngx_chain_t *next;
};
typedef struct {
ngx_int_t num;
size_t size;
} ngx_bufs_t;
typedef struct ngx_output_chain_ctx_s ngx_output_chain_ctx_t;
typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in);
typedef void (*ngx_output_chain_aio_pt)(ngx_output_chain_ctx_t *ctx,
ngx_file_t *file);
struct ngx_output_chain_ctx_s {
ngx_buf_t *buf;
ngx_chain_t *in;
ngx_chain_t *free;
ngx_chain_t *busy;
unsigned sendfile:1;
unsigned directio:1;
unsigned unaligned:1;
unsigned need_in_memory:1;
unsigned need_in_temp:1;
unsigned aio:1;
#if (NGX_HAVE_FILE_AIO || NGX_COMPAT)
ngx_output_chain_aio_pt aio_handler;
#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
ssize_t (*aio_preload)(ngx_buf_t *file);
#endif
#endif
#if (NGX_THREADS || NGX_COMPAT)
ngx_int_t (*thread_handler)(ngx_thread_task_t *task,
ngx_file_t *file);
ngx_thread_task_t *thread_task;
#endif
off_t alignment;
ngx_pool_t *pool;
ngx_int_t allocated;
ngx_bufs_t bufs;
ngx_buf_tag_t tag;
ngx_output_chain_filter_pt output_filter;
void *filter_ctx;
};
typedef struct {
ngx_chain_t *out;
ngx_chain_t **last;
ngx_connection_t *connection;
ngx_pool_t *pool;
off_t limit;
} ngx_chain_writer_ctx_t;
#define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
#define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
#define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
#define ngx_buf_special(b) \
((b->flush || b->last_buf || b->sync) \
&& !ngx_buf_in_memory(b) && !b->in_file)
#define ngx_buf_sync_only(b) \
(b->sync \
&& !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf)
#define ngx_buf_size(b) \
(ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \
(b->file_last - b->file_pos))
ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
#define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
#define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool);
#define ngx_free_chain(pool, cl) \
cl->next = pool->chain; \
pool->chain = cl
ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in);
ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
ngx_chain_t *in);
ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free);
void ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free,
ngx_chain_t **busy, ngx_chain_t **out, ngx_buf_tag_t tag);
off_t ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit);
ngx_chain_t *ngx_chain_update_sent(ngx_chain_t *in, off_t sent);
#endif /* _NGX_BUF_H_INCLUDED_ */
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