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Filename : apreq.h
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/*
**  Licensed to the Apache Software Foundation (ASF) under one or more
** contributor license agreements.  See the NOTICE file distributed with
** this work for additional information regarding copyright ownership.
** The ASF licenses this file to You under the Apache License, Version 2.0
** (the "License"); you may not use this file except in compliance with
** the License.  You may obtain a copy of the License at
**
**      http://www.apache.org/licenses/LICENSE-2.0
**
**  Unless required by applicable law or agreed to in writing, software
**  distributed under the License is distributed on an "AS IS" BASIS,
**  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
**  See the License for the specific language governing permissions and
**  limitations under the License.
*/

#ifndef APREQ_H
#define APREQ_H

#ifdef APREQ_DEBUG
#include <assert.h>
#endif

#include "apr_tables.h"
#include <stddef.h>

#ifdef  __cplusplus
 extern "C" {
#endif

/**
 * @file apreq.h
 * @brief Main header file...
 * @ingroup libapreq2
 *
 * Define the generic APREQ_ macros and common data structures.
 */

#ifndef WIN32
/**
 * The public APREQ functions are declared with APREQ_DECLARE(), so they may
 * use the most appropriate calling convention.  Public APR functions with 
 * variable arguments must use APR_DECLARE_NONSTD().
 *
 * @remark Both the declaration and implementations must use the same macro.
 */
/** APREQ_DECLARE(rettype) apeq_func(args)
 */
#define APREQ_DECLARE(d)                APR_DECLARE(d)
/**
 * The public APEQ functions using variable arguments are declared with 
 * APEQ_DECLARE_NONSTD(), as they must follow the C language calling convention.
 * @see APEQ_DECLARE @see APEQ_DECLARE_DATA
 * @remark Both the declaration and implementations must use the same macro.
 * @example
 */
/** APEQ_DECLARE_NONSTD(rettype) apr_func(args, ...);
 */
#define APREQ_DECLARE_NONSTD(d)         APR_DECLARE_NONSTD(d)
/**
 * The public APREQ variables are declared with APREQ_DECLARE_DATA.
 * This assures the appropriate indirection is invoked at compile time.
 * @see APREQ_DECLARE @see APREQ_DECLARE_NONSTD
 * @remark Note that the declaration and implementations use different forms,
 * but both must include the macro.
 */
/** extern APREQ_DECLARE_DATA type apr_variable;\n
 * APREQ_DECLARE_DATA type apr_variable = value;
 */
#define APREQ_DECLARE_DATA
#elif defined (APREQ_DECLARE_STATIC)
#define APREQ_DECLARE(type)             type __stdcall
#define APREQ_DECLARE_NONSTD(type)      type
#define APREQ_DECLARE_DATA
#elif defined (APREQ_DECLARE_EXPORT)
#define APREQ_DECLARE(type)             __declspec(dllexport) type __stdcall
#define APREQ_DECLARE_NONSTD(type)      __declspec(dllexport) type
#define APREQ_DECLARE_DATA              __declspec(dllexport)
#else
#define APREQ_DECLARE(type)             __declspec(dllimport) type __stdcall
#define APREQ_DECLARE_NONSTD(type)      __declspec(dllimport) type
#define APREQ_DECLARE_DATA              __declspec(dllimport)
#endif

/**
 * Read chucks of data in 64k blocks from the request 
 */

#define APREQ_DEFAULT_READ_BLOCK_SIZE   (64  * 1024)

/**
 * Maximum number of bytes mod_apreq2 will send off to libapreq2 for parsing. 
 * mod_apreq2 will log this event and subsequently remove itself 
 * from the filter chain.  
 * @see ap_set_read_limit  
 */
#define APREQ_DEFAULT_READ_LIMIT        (64 * 1024 * 1024)
/**
 * Maximum number of bytes mod_apreq2 will let accumulate within the 
 * heap-buckets in a brigade. Excess data will be spooled to an 
 * appended file bucket
 * @see ap_set_brigade_read_limit
 */
#define APREQ_DEFAULT_BRIGADE_LIMIT     (256 * 1024)

/**
 * Number of elements in the initial apr_table
 * @see apr_table_make
 */
#define APREQ_DEFAULT_NELTS              8



/**
 * Check to see if specified bit f is off in bitfield name
 */
#define APREQ_FLAGS_OFF(f, name) ((f) &= ~(name##_MASK << name##_BIT))
/**
 * Check to see if specified bit f is on in bitfield name
 */
#define APREQ_FLAGS_ON(f, name)  ((f) |=  (name##_MASK << name##_BIT))
/**
 *  Get specified bit f in bitfield name
 */
#define APREQ_FLAGS_GET(f, name) (((f) >> name##_BIT) & name##_MASK)
/**
 * Set specified bit f in bitfield name to value 
 * Note the below BIT/Mask defines are used sans the
 * _BIT, _MASK because of the this define's \#\#_MASK, \#\#_BIT usage.
 * Each come in a pair
 */
#define APREQ_FLAGS_SET(f, name, value)                 \
    ((f) = (((f) & ~(name##_MASK << name##_BIT))        \
            | ((name##_MASK & (value)) << name##_BIT)))

/**
 * Charset Bit 
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_CHARSET_BIT           0

/**
 * Charset Mask
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_CHARSET_MASK        255

/**
 * Tainted Bit 
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_TAINTED_BIT           8
/**
 * Tainted Mask
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_TAINTED_MASK          1

/**
 * Cookier Version Bit
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */

#define APREQ_COOKIE_VERSION_BIT   11
/**
 * Cookie Version Mask
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_COOKIE_VERSION_MASK   3

/**
 * Cookie's Secure Bit 
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_COOKIE_SECURE_BIT    13
/**
 * Cookie's Secure Mask
 * @see APREQ_FLAGS_OFF @see APREQ_FLAGS_ON
 * @see APREQ_FLAGS_GET @see APREQ_FLAGS_SET
 */
#define APREQ_COOKIE_SECURE_MASK    1

/** Character encodings. */
typedef enum {
    APREQ_CHARSET_ASCII  =0,
    APREQ_CHARSET_LATIN1 =1, /* ISO-8859-1   */
    APREQ_CHARSET_CP1252 =2, /* Windows-1252 */
    APREQ_CHARSET_UTF8   =8
} apreq_charset_t;


/** @enum apreq_join_t Join type */
typedef enum {
    APREQ_JOIN_AS_IS,      /**< Join the strings without modification */
    APREQ_JOIN_ENCODE,     /**< Url-encode the strings before joining them */
    APREQ_JOIN_DECODE,     /**< Url-decode the strings before joining them */
    APREQ_JOIN_QUOTE       /**< Quote the strings, backslashing existing quote marks. */
} apreq_join_t;

/** @enum apreq_match_t Match type */
typedef enum {
    APREQ_MATCH_FULL,       /**< Full match only. */
    APREQ_MATCH_PARTIAL     /**< Partial matches are ok. */
} apreq_match_t;

/** @enum apreq_expires_t Expiration date format */
typedef enum {
    APREQ_EXPIRES_HTTP,       /**< Use date formatting consistent with RFC 2616 */
    APREQ_EXPIRES_NSCOOKIE    /**< Use format consistent with Netscape's Cookie Spec */
} apreq_expires_t;


/** @brief libapreq's pre-extensible string type */
typedef struct apreq_value_t {
    char             *name;    /**< value name */
    apr_size_t        nlen;    /**< length of name */
    apr_size_t        dlen;    /**< length of data */
    char              data[1]; /**< value data  */
} apreq_value_t;

/**
 * Adds the specified apreq_value_t to the apr_table_t.
 *
 * @param v value to add
 * @param t add v to this table
 *
 * @return void
 *
 * @ see apr_table_t @see apr_value_t
 */
  
static APR_INLINE
void apreq_value_table_add(const apreq_value_t *v, apr_table_t *t) {
    apr_table_addn(t, v->name, v->data);
}

/**
 * @param T type
 * @param A attribute
 * @param P
 *
 * XXX
 */
#define apreq_attr_to_type(T,A,P) ( (T*) ((char*)(P)-offsetof(T,A)) )

/**
 * Initialize libapreq2. Applications (except apache modules using
 * mod_apreq) should call this exactly once before they use any
 * libapreq2 modules.  If you want to modify the list of default parsers
 * with apreq_register_parser(), please use apreq_pre_initialize()
 * and apreq_post_initialize() instead.
 *
 * @param pool a base pool persisting while libapreq2 is used
 * @remarks after you detroy the pool, you have to call this function again
 *    with a new pool if you still plan to use libapreq2
 */
APREQ_DECLARE(apr_status_t) apreq_initialize(apr_pool_t *pool);


/**
 * Pre-initialize libapreq2. Applications (except apache modules using
 * mod_apreq2) should call this exactly once before they register custom
 * parsers with libapreq2. mod_apreq2 does this automatically during the
 * post-config phase, so modules that need call apreq_register_parser should
 * create a post-config hook using APR_HOOK_MIDDLE.
 *
 * @param pool a base pool persisting while libapreq2 is used
 * @remarks after you detroyed the pool, you have to call this function again
 *    with a new pool if you still plan to use libapreq2
 */
APREQ_DECLARE(apr_status_t) apreq_pre_initialize(apr_pool_t *pool);

/**
 * Post-initialize libapreq2. Applications (except apache modules using
 * mod_apreq2) should this exactly once before they use any
 * libapreq2 modules for parsing.
 *
 * @param pool the same pool that was used in apreq_pre_initialize().
 */
APREQ_DECLARE(apr_status_t) apreq_post_initialize(apr_pool_t *pool);


#ifdef __cplusplus
 }
#endif

#endif /* APREQ_H */