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* include/haproxy/compression-t.h

* This file defines everything related to compression.

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 minsize_res; /* Min response body size to be compressed */

unsigned int minsize_req; /* Min request body size to be compressed */

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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