晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/bind9/isc/base64.h
/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef ISC_BASE64_H
#define ISC_BASE64_H 1

/*! \file isc/base64.h */

#include <isc/lang.h>
#include <isc/types.h>

ISC_LANG_BEGINDECLS

/***
 *** Functions
 ***/

isc_result_t
isc_base64_totext(isc_region_t *source, int wordlength,
		  const char *wordbreak, isc_buffer_t *target);
/*!<
 * \brief Convert data into base64 encoded text.
 *
 * Notes:
 *\li	The base64 encoded text in 'target' will be divided into
 *	words of at most 'wordlength' characters, separated by
 * 	the 'wordbreak' string.  No parentheses will surround
 *	the text.
 *
 * Requires:
 *\li	'source' is a region containing binary data
 *\li	'target' is a text buffer containing available space
 *\li	'wordbreak' points to a null-terminated string of
 *		zero or more whitespace characters
 *
 * Ensures:
 *\li	target will contain the base64 encoded version of the data
 *	in source.  The 'used' pointer in target will be advanced as
 *	necessary.
 */

isc_result_t
isc_base64_decodestring(const char *cstr, isc_buffer_t *target);
/*!<
 * \brief Decode a null-terminated base64 string.
 *
 * Requires:
 *\li	'cstr' is non-null.
 *\li	'target' is a valid buffer.
 *
 * Returns:
 *\li	#ISC_R_SUCCESS	-- the entire decoded representation of 'cstring'
 *			   fit in 'target'.
 *\li	#ISC_R_BADBASE64 -- 'cstr' is not a valid base64 encoding.
 *
 * 	Other error returns are any possible error code from:
 *\li		isc_lex_create(),
 *\li		isc_lex_openbuffer(),
 *\li		isc_base64_tobuffer().
 */

isc_result_t
isc_base64_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length);
/*!<
 * \brief Convert base64 encoded text from a lexer context into
 * `target`. If 'length' is non-negative, it is the expected number of
 * encoded octets to convert.
 *
 * If 'length' is -1 then 0 or more encoded octets are expected.
 * If 'length' is -2 then 1 or more encoded octets are expected.
 *
 * Returns:
 *\li	#ISC_R_BADBASE64 -- invalid base64 encoding.
 *\li	#ISC_R_UNEXPECTEDEND: the text does not contain the expected
 *			      number of encoded octets.
 *
 * Requires:
 *\li	'lexer' is a valid lexer context
 *\li	'target' is a buffer containing binary data
 *\li	'length' is -2, -1, or non-negative
 *
 * Ensures:
 *\li	target will contain the data represented by the base64 encoded
 *	string parsed by the lexer.  No more than `length` octets will
 *	be read, if `length` is non-negative.  The 'used' pointer in
 *	'target' will be advanced as necessary.
 */

ISC_LANG_ENDDECLS

#endif /* ISC_BASE64_H */

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