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/*
* include/haproxy/compression-t.h
* This file defines everything related to compression.
*
* Copyright 2012 Exceliance, David Du Colombier <dducolombier@exceliance.fr>
William Lallemand <wlallemand@exceliance.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_COMP_T_H
#define _HAPROXY_COMP_T_H
#if defined(USE_SLZ)
#ifdef USE_ZLIB
#error "Cannot build with both USE_SLZ and USE_ZLIB at the same time."
#endif
#include <import/slz.h>
#elif defined(USE_ZLIB)
#include <zlib.h>
#endif
#include <haproxy/buf-t.h>
/* Direction index */
#define COMP_DIR_REQ 0
#define COMP_DIR_RES 1
/* Compression flags */
#define COMP_FL_OFFLOAD 0x00000001 /* Compression offload */
#define COMP_FL_DIR_REQ 0x00000002 /* Compress requests */
#define COMP_FL_DIR_RES 0x00000004 /* Compress responses */
struct comp {
struct comp_algo *algos_res; /* Algos available for response */
struct comp_algo *algo_req; /* Algo to use for request */
struct comp_type *types_req; /* Types to be compressed for requests */
struct comp_type *types_res; /* Types to be compressed for responses */
unsigned int flags;
};
struct comp_ctx {
#if defined(USE_SLZ)
struct slz_stream strm;
const void *direct_ptr; /* NULL or pointer to beginning of data */
int direct_len; /* length of direct_ptr if not NULL */
struct buffer queued; /* if not NULL, data already queued */
#elif defined(USE_ZLIB)
z_stream strm; /* zlib stream */
void *zlib_deflate_state;
void *zlib_window;
void *zlib_prev;
void *zlib_pending_buf;
void *zlib_head;
#endif
int cur_lvl;
};
/* Thanks to MSIE/IIS, the "deflate" name is ambiguous, as according to the RFC
* it's a zlib-wrapped deflate stream, but MSIE only understands a raw deflate
* stream. For this reason some people prefer to emit a raw deflate stream on
* "deflate" and we'll need two algos for the same name, they are distinguished
* with the config name.
*/
struct comp_algo {
char *cfg_name; /* config name */
int cfg_name_len;
char *ua_name; /* name for the user-agent */
int ua_name_len;
int (*init)(struct comp_ctx **comp_ctx, int level);
int (*add_data)(struct comp_ctx *comp_ctx, const char *in_data, int in_len, struct buffer *out);
int (*flush)(struct comp_ctx *comp_ctx, struct buffer *out);
int (*finish)(struct comp_ctx *comp_ctx, struct buffer *out);
int (*end)(struct comp_ctx **comp_ctx);
struct comp_algo *next;
};
struct comp_type {
char *name;
int name_len;
struct comp_type *next;
};
#endif /* _HAPROXY_COMP_T_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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