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147 lines
6.6 KiB
C
147 lines
6.6 KiB
C
/*
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Serval URI primitives
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Copyright (C) 2015 Serval Project Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __SERVAL_DNA__URI_H__
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#define __SERVAL_DNA__URI_H__
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#include <stdint.h> // for uint16_t
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#include <sys/types.h> // for size_t
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/* -------------------- URI encoding and decoding -------------------- */
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/* Encode up to 'srclen' bytes of byte data (or up to first nul if 'srclen' == -1) at 'src' into at
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* most 'dstsiz' bytes of URI-encoded (or www-form-urlencoded) representation at 'dstUrienc'. If
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* 'dstsiz' is -1 or 'dstUrienc' is NULL, does not write any encoded bytes, but still counts them.
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* If 'afterp' is not NULL, then sets *afterp to point to the source byte immediately following the
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* last character encoded. A "%xx" sequence will never be partially encoded; if all the "%xx" does
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* not fit within the destination buffer, then none of it is produced.
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*
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* Returns the total number of encoded bytes written at 'dstUrienc'.
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*
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* Can be used to count encoded bytes without actually encoding, eg:
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*
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* uri_encode(NULL, -1, buf, buflen, NULL);
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*
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* The uri_encodev() and www_form_uri_encodev() functions are a multi-buffer gather variants,
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* analagous to readv(2) and writev(2). Modifies the supplied *iovp, *iovcntp parameters and the
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* iovec structures at (*iovp)[...] to represent the remaining source bytes not encoded.
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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size_t uri_encode(char *const dstUrienc, ssize_t dstsiz, const char *src, size_t srclen, const char **afterp);
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size_t www_form_uri_encode(char *const dstUrienc, ssize_t dstsiz, const char *src, size_t srclen, const char **afterp);
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struct iovec;
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size_t uri_encodev(char *const dstUrienc, ssize_t dstsiz, struct iovec **iovp, int *iovcntp); // modifies *iovp, (*iovp)[...] and *iovcntp
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size_t www_form_uri_encodev(char *const dstUrienc, ssize_t dstsiz, struct iovec **iovp, int *iovcntp); // modifies *iovp, (*iovp)[...] and *iovcntp
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/* Decode up to 'srclen' bytes of URI-encoded (or www-form-urlencoded) data at 'srcUrienc' into at
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* most 'dstsiz' bytes at 'dst'. If 'dstsiz' is -1 or 'dst' is NULL, then does not write any
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* decoded bytes, but still counts them. If 'afterp' is not NULL, then sets *afterp to point to the
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* source byte immediately following the last byte decoded.
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*
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* Returns the total number of decoded bytes written at 'dst'.
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*
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* Can be used to decode in-place, eg:
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*
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* uri_decode((char *)buf, n, (const unsigned char *)buf, n, NULL);
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*
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* Can be used to count decoded bytes without actually decoding, eg:
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*
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* uri_decode(NULL, -1, buf, buflen, NULL);
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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size_t uri_decode(char *const dst, ssize_t dstsiz, const char *srcUrienc, size_t srclen, const char **afterp);
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size_t www_form_uri_decode(char *const dst, ssize_t dstsiz, const char *srcUrienc, size_t srclen, const char **afterp);
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/* -------------------- URI parsing -------------------- */
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/* Return true if the string resembles a nul-terminated URI.
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* Based on RFC-3986 generic syntax, assuming nothing about the hierarchical part.
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*
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* uri := scheme ":" hierarchical [ "?" query ] [ "#" fragment ]
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int str_is_uri(const char *uri);
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/* Return true if the string resembles a URI scheme without the terminating colon.
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* Based on RFC-3986 generic syntax.
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int str_is_uri_scheme(const char *scheme);
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/* Pick apart a URI into its basic parts.
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*
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* uri := scheme ":" hierarchical [ "?" query ] [ "#" fragment ]
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*
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* Based on RFC-3986 generic syntax, assuming nothing about the hierarchical
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* part. If the respective part is found, sets (*partp) to point to the start
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* of the part within the supplied 'uri' string, sets (*lenp) to the length of
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* the part substring and returns 1. Otherwise returns 0. These functions
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* do not reliably validate that the string in 'uri' is a valid URI; that must
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* be done by calling str_is_uri().
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int str_uri_scheme(const char *uri, const char **partp, size_t *lenp);
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int str_uri_hierarchical(const char *uri, const char **partp, size_t *lenp);
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int str_uri_query(const char *uri, const char **partp, size_t *lenp);
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int str_uri_fragment(const char *uri, const char **partp, size_t *lenp);
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/* Pick apart a URI hierarchical part into its basic parts.
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*
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* hierarchical := "//" authority [ "/" path ]
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*
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* If the respective part is found, sets (*partp) to point to the start of the
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* part within the supplied 'uri' string, sets (*lenp) to the length of the
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* part substring and returns 1. Otherwise returns 0.
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*
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* These functions may be called directly on the part returned by
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* str_uri_hierarchical(), even though it is not nul-terminated, because they
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* treat "?" and "#" as equally valid terminators.
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int str_uri_hierarchical_authority(const char *hier, const char **partp, size_t *lenp);
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int str_uri_hierarchical_path(const char *hier, const char **partp, size_t *lenp);
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/* Pick apart a URI authority into its basic parts.
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*
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* authority := [ username ":" password "@" ] hostname [ ":" port ]
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*
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* If the respective part is found, sets (*partp) to point to the start of the
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* part within the supplied 'uri' string, sets (*lenp) to the length of the
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* part substring and returns 1. Otherwise returns 0.
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*
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* These functions may be called directly on the part returned by
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* str_uri_hierarchical_authority(), even though it is not nul-terminated,
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* because they treat "/", "?" and "#" as equally valid terminators.
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int str_uri_authority_username(const char *auth, const char **partp, size_t *lenp);
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int str_uri_authority_password(const char *auth, const char **partp, size_t *lenp);
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int str_uri_authority_hostname(const char *auth, const char **partp, size_t *lenp);
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int str_uri_authority_port(const char *auth, uint16_t *portp);
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#endif // __SERVAL_DNA__URI_H__
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