253 lines
7.8 KiB
C
253 lines
7.8 KiB
C
/*
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* This file Copyright (C) 2008-2010 Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#ifndef TR_BENCODE_H
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#define TR_BENCODE_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <inttypes.h> /* for int64_t */
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struct evbuffer;
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/**
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* @addtogroup tr_benc Variant
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*
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* An object that acts like a union for
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* integers, strings, lists, dictionaries, booleans, and floating-point numbers.
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* The structure is named tr_benc due to the historical reason that it was
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* originally tightly coupled with bencoded data. It currently supports
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* being parsed from, and serialized to, both bencoded notation and json notation.
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*
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* @{
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*/
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/* these are PRIVATE IMPLEMENTATION details that should not be touched.
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* I'll probably change them just to break your code! HA HA HA!
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* it's included in the header for inlining and composition */
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enum
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{
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TR_TYPE_INT = 1,
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TR_TYPE_STR = 2,
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TR_TYPE_LIST = 4,
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TR_TYPE_DICT = 8,
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TR_TYPE_BOOL = 16,
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TR_TYPE_REAL = 32
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};
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/* These are PRIVATE IMPLEMENTATION details that should not be touched.
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* I'll probably change them just to break your code! HA HA HA!
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* it's included in the header for inlining and composition */
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typedef struct tr_benc
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{
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union
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{
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uint8_t b; /* bool type */
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double d; /* double type */
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int64_t i; /* int type */
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struct /* string type */
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{
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size_t len; /* the string length */
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union {
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char buf[16]; /* local buffer for short strings */
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char * ptr; /* alloc'ed pointer for long strings */
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} str;
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} s;
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struct /* list & dict types */
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{
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struct tr_benc * vals; /* nodes */
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size_t alloc; /* nodes allocated */
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size_t count; /* nodes used */
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} l;
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} val;
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char type;
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} tr_benc;
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/***
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****
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***/
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int tr_bencParse( const void * buf,
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const void * bufend,
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tr_benc * setme_benc,
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const uint8_t ** setme_end );
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int tr_bencLoad( const void * buf,
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size_t buflen,
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tr_benc * setme_benc,
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char ** setme_end );
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void tr_bencFree( tr_benc * );
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void tr_bencInitStr( tr_benc *, const void * str, int str_len );
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void tr_bencInitRaw( tr_benc *, const void * raw, size_t raw_len );
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void tr_bencInitInt( tr_benc *, int64_t num );
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int tr_bencInitDict( tr_benc *, size_t reserveCount );
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int tr_bencInitList( tr_benc *, size_t reserveCount );
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void tr_bencInitBool( tr_benc *, int value );
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void tr_bencInitReal( tr_benc *, double value );
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/***
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**** Serialization / Deserialization
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***/
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typedef enum
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{
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TR_FMT_BENC,
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TR_FMT_JSON,
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TR_FMT_JSON_LEAN /* saves bandwidth by omitting all whitespace. */
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}
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tr_fmt_mode;
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int tr_bencToFile( const tr_benc *, tr_fmt_mode, const char * filename );
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char* tr_bencToStr( const tr_benc *, tr_fmt_mode, int * len );
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void tr_bencToBuf( const tr_benc *, tr_fmt_mode, struct evbuffer * );
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/* TR_FMT_JSON_LEAN and TR_FMT_JSON are equivalent in this function. */
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int tr_bencLoadFile( tr_benc * setme, tr_fmt_mode, const char * filename );
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/***
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****
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***/
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int tr_bencListReserve( tr_benc *, size_t reserveCount );
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tr_benc * tr_bencListAdd( tr_benc * );
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tr_benc * tr_bencListAddInt( tr_benc *, int64_t val );
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tr_benc * tr_bencListAddStr( tr_benc *, const char * val );
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tr_benc * tr_bencListAddList( tr_benc *, size_t reserveCount );
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tr_benc * tr_bencListAddDict( tr_benc *, size_t reserveCount );
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size_t tr_bencListSize( const tr_benc * list );
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tr_benc * tr_bencListChild( tr_benc * list, size_t n );
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/***
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****
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***/
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int tr_bencDictReserve( tr_benc *, size_t reserveCount );
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int tr_bencDictRemove( tr_benc *, const char * key );
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tr_benc * tr_bencDictAdd( tr_benc *, const char * key );
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tr_benc * tr_bencDictAddReal( tr_benc *, const char * key, double );
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tr_benc * tr_bencDictAddInt( tr_benc *, const char * key, int64_t );
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tr_benc * tr_bencDictAddBool( tr_benc *, const char * key, tr_bool );
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tr_benc * tr_bencDictAddStr( tr_benc *, const char * key, const char * );
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tr_benc * tr_bencDictAddList( tr_benc *, const char * key, size_t reserve );
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tr_benc * tr_bencDictAddDict( tr_benc *, const char * key, size_t reserve );
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tr_benc * tr_bencDictAddRaw( tr_benc *, const char * key,
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const void * raw, size_t rawlen );
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tr_bool tr_bencDictChild( tr_benc *, size_t i, const char ** key, tr_benc ** val );
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tr_benc* tr_bencDictFind( tr_benc *, const char * key );
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tr_bool tr_bencDictFindList( tr_benc *, const char * key, tr_benc ** setme );
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tr_bool tr_bencDictFindDict( tr_benc *, const char * key, tr_benc ** setme );
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tr_bool tr_bencDictFindInt( tr_benc *, const char * key, int64_t * setme );
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tr_bool tr_bencDictFindReal( tr_benc *, const char * key, double * setme );
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tr_bool tr_bencDictFindBool( tr_benc *, const char * key, tr_bool * setme );
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tr_bool tr_bencDictFindStr( tr_benc *, const char * key, const char ** setme );
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tr_bool tr_bencDictFindRaw( tr_benc *, const char * key,
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const uint8_t ** setme_raw, size_t * setme_len );
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/***
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****
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***/
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/** @brief Get an int64_t from a variant object
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@return TRUE if successful, or FALSE if the variant could not be represented as an int64_t */
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tr_bool tr_bencGetInt( const tr_benc * val, int64_t * setme );
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/** @brief Get an string from a variant object
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@return TRUE if successful, or FALSE if the variant could not be represented as a string */
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tr_bool tr_bencGetStr( const tr_benc * val, const char ** setme );
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/** @brief Get a boolean from a variant object
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@return TRUE if successful, or FALSE if the variant could not be represented as a boolean */
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tr_bool tr_bencGetBool( const tr_benc * val, tr_bool * setme );
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/** @brief Get a floating-point number from a variant object
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@return TRUE if successful, or FALSE if the variant could not be represented as a floating-point number */
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tr_bool tr_bencGetReal( const tr_benc * val, double * setme );
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static inline tr_bool tr_bencIsType ( const tr_benc * b, int type ) { return ( b != NULL ) && ( b->type == type ); }
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static inline tr_bool tr_bencIsInt ( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_INT ); }
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static inline tr_bool tr_bencIsDict ( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_DICT ); }
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static inline tr_bool tr_bencIsList ( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_LIST ); }
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static inline tr_bool tr_bencIsString( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_STR ); }
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static inline tr_bool tr_bencIsBool ( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_BOOL ); }
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static inline tr_bool tr_bencIsReal ( const tr_benc * b ) { return tr_bencIsType( b, TR_TYPE_REAL ); }
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/** @brief Private function that's exposed here only for unit tests */
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int tr_bencParseInt( const uint8_t * buf,
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const uint8_t * bufend,
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const uint8_t ** setme_end,
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int64_t * setme_val );
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/** @brief Private function that's exposed here only for unit tests */
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int tr_bencParseStr( const uint8_t * buf,
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const uint8_t * bufend,
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const uint8_t ** setme_end,
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const uint8_t ** setme_str,
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size_t * setme_strlen );
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/**
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***
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**/
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/* this is only quasi-supported. don't rely on it too heavily outside of libT */
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void tr_bencMergeDicts( tr_benc * target, const tr_benc * source );
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/* @} */
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#ifdef __cplusplus
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}
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#endif
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#endif
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