From 35a201cc8ef0c3f5b2df88d2e528aabee1048348 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Fri, 30 Apr 2021 18:47:09 +0200 Subject: Initial/Final commit --- libxml2-2.9.10/uri.c | 2554 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 2554 insertions(+) create mode 100644 libxml2-2.9.10/uri.c (limited to 'libxml2-2.9.10/uri.c') diff --git a/libxml2-2.9.10/uri.c b/libxml2-2.9.10/uri.c new file mode 100644 index 0000000..05d81e5 --- /dev/null +++ b/libxml2-2.9.10/uri.c @@ -0,0 +1,2554 @@ +/** + * uri.c: set of generic URI related routines + * + * Reference: RFCs 3986, 2732 and 2373 + * + * See Copyright for the status of this software. + * + * daniel@veillard.com + */ + +#define IN_LIBXML +#include "libxml.h" + +#include + +#include +#include +#include +#include + +/** + * MAX_URI_LENGTH: + * + * The definition of the URI regexp in the above RFC has no size limit + * In practice they are usually relatively short except for the + * data URI scheme as defined in RFC 2397. Even for data URI the usual + * maximum size before hitting random practical limits is around 64 KB + * and 4KB is usually a maximum admitted limit for proper operations. + * The value below is more a security limit than anything else and + * really should never be hit by 'normal' operations + * Set to 1 MByte in 2012, this is only enforced on output + */ +#define MAX_URI_LENGTH 1024 * 1024 + +static void +xmlURIErrMemory(const char *extra) +{ + if (extra) + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_URI, + XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, + extra, NULL, NULL, 0, 0, + "Memory allocation failed : %s\n", extra); + else + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_URI, + XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, + NULL, NULL, NULL, 0, 0, + "Memory allocation failed\n"); +} + +static void xmlCleanURI(xmlURIPtr uri); + +/* + * Old rule from 2396 used in legacy handling code + * alpha = lowalpha | upalpha + */ +#define IS_ALPHA(x) (IS_LOWALPHA(x) || IS_UPALPHA(x)) + + +/* + * lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | + * "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" | + * "u" | "v" | "w" | "x" | "y" | "z" + */ + +#define IS_LOWALPHA(x) (((x) >= 'a') && ((x) <= 'z')) + +/* + * upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | + * "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | + * "U" | "V" | "W" | "X" | "Y" | "Z" + */ +#define IS_UPALPHA(x) (((x) >= 'A') && ((x) <= 'Z')) + +#ifdef IS_DIGIT +#undef IS_DIGIT +#endif +/* + * digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" + */ +#define IS_DIGIT(x) (((x) >= '0') && ((x) <= '9')) + +/* + * alphanum = alpha | digit + */ + +#define IS_ALPHANUM(x) (IS_ALPHA(x) || IS_DIGIT(x)) + +/* + * mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")" + */ + +#define IS_MARK(x) (((x) == '-') || ((x) == '_') || ((x) == '.') || \ + ((x) == '!') || ((x) == '~') || ((x) == '*') || ((x) == '\'') || \ + ((x) == '(') || ((x) == ')')) + +/* + * unwise = "{" | "}" | "|" | "\" | "^" | "`" + */ + +#define IS_UNWISE(p) \ + (((*(p) == '{')) || ((*(p) == '}')) || ((*(p) == '|')) || \ + ((*(p) == '\\')) || ((*(p) == '^')) || ((*(p) == '[')) || \ + ((*(p) == ']')) || ((*(p) == '`'))) +/* + * reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," | + * "[" | "]" + */ + +#define IS_RESERVED(x) (((x) == ';') || ((x) == '/') || ((x) == '?') || \ + ((x) == ':') || ((x) == '@') || ((x) == '&') || ((x) == '=') || \ + ((x) == '+') || ((x) == '$') || ((x) == ',') || ((x) == '[') || \ + ((x) == ']')) + +/* + * unreserved = alphanum | mark + */ + +#define IS_UNRESERVED(x) (IS_ALPHANUM(x) || IS_MARK(x)) + +/* + * Skip to next pointer char, handle escaped sequences + */ + +#define NEXT(p) ((*p == '%')? p += 3 : p++) + +/* + * Productions from the spec. + * + * authority = server | reg_name + * reg_name = 1*( unreserved | escaped | "$" | "," | + * ";" | ":" | "@" | "&" | "=" | "+" ) + * + * path = [ abs_path | opaque_part ] + */ + +#define STRNDUP(s, n) (char *) xmlStrndup((const xmlChar *)(s), (n)) + +/************************************************************************ + * * + * RFC 3986 parser * + * * + ************************************************************************/ + +#define ISA_DIGIT(p) ((*(p) >= '0') && (*(p) <= '9')) +#define ISA_ALPHA(p) (((*(p) >= 'a') && (*(p) <= 'z')) || \ + ((*(p) >= 'A') && (*(p) <= 'Z'))) +#define ISA_HEXDIG(p) \ + (ISA_DIGIT(p) || ((*(p) >= 'a') && (*(p) <= 'f')) || \ + ((*(p) >= 'A') && (*(p) <= 'F'))) + +/* + * sub-delims = "!" / "$" / "&" / "'" / "(" / ")" + * / "*" / "+" / "," / ";" / "=" + */ +#define ISA_SUB_DELIM(p) \ + (((*(p) == '!')) || ((*(p) == '$')) || ((*(p) == '&')) || \ + ((*(p) == '(')) || ((*(p) == ')')) || ((*(p) == '*')) || \ + ((*(p) == '+')) || ((*(p) == ',')) || ((*(p) == ';')) || \ + ((*(p) == '=')) || ((*(p) == '\''))) + +/* + * gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" + */ +#define ISA_GEN_DELIM(p) \ + (((*(p) == ':')) || ((*(p) == '/')) || ((*(p) == '?')) || \ + ((*(p) == '#')) || ((*(p) == '[')) || ((*(p) == ']')) || \ + ((*(p) == '@'))) + +/* + * reserved = gen-delims / sub-delims + */ +#define ISA_RESERVED(p) (ISA_GEN_DELIM(p) || (ISA_SUB_DELIM(p))) + +/* + * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" + */ +#define ISA_UNRESERVED(p) \ + ((ISA_ALPHA(p)) || (ISA_DIGIT(p)) || ((*(p) == '-')) || \ + ((*(p) == '.')) || ((*(p) == '_')) || ((*(p) == '~'))) + +/* + * pct-encoded = "%" HEXDIG HEXDIG + */ +#define ISA_PCT_ENCODED(p) \ + ((*(p) == '%') && (ISA_HEXDIG(p + 1)) && (ISA_HEXDIG(p + 2))) + +/* + * pchar = unreserved / pct-encoded / sub-delims / ":" / "@" + */ +#define ISA_PCHAR(p) \ + (ISA_UNRESERVED(p) || ISA_PCT_ENCODED(p) || ISA_SUB_DELIM(p) || \ + ((*(p) == ':')) || ((*(p) == '@'))) + +/** + * xmlParse3986Scheme: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse an URI scheme + * + * ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986Scheme(xmlURIPtr uri, const char **str) { + const char *cur; + + if (str == NULL) + return(-1); + + cur = *str; + if (!ISA_ALPHA(cur)) + return(2); + cur++; + while (ISA_ALPHA(cur) || ISA_DIGIT(cur) || + (*cur == '+') || (*cur == '-') || (*cur == '.')) cur++; + if (uri != NULL) { + if (uri->scheme != NULL) xmlFree(uri->scheme); + uri->scheme = STRNDUP(*str, cur - *str); + } + *str = cur; + return(0); +} + +/** + * xmlParse3986Fragment: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse the query part of an URI + * + * fragment = *( pchar / "/" / "?" ) + * NOTE: the strict syntax as defined by 3986 does not allow '[' and ']' + * in the fragment identifier but this is used very broadly for + * xpointer scheme selection, so we are allowing it here to not break + * for example all the DocBook processing chains. + * + * Returns 0 or the error code + */ +static int +xmlParse3986Fragment(xmlURIPtr uri, const char **str) +{ + const char *cur; + + if (str == NULL) + return (-1); + + cur = *str; + + while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') || + (*cur == '[') || (*cur == ']') || + ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur)))) + NEXT(cur); + if (uri != NULL) { + if (uri->fragment != NULL) + xmlFree(uri->fragment); + if (uri->cleanup & 2) + uri->fragment = STRNDUP(*str, cur - *str); + else + uri->fragment = xmlURIUnescapeString(*str, cur - *str, NULL); + } + *str = cur; + return (0); +} + +/** + * xmlParse3986Query: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse the query part of an URI + * + * query = *uric + * + * Returns 0 or the error code + */ +static int +xmlParse3986Query(xmlURIPtr uri, const char **str) +{ + const char *cur; + + if (str == NULL) + return (-1); + + cur = *str; + + while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') || + ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur)))) + NEXT(cur); + if (uri != NULL) { + if (uri->query != NULL) + xmlFree(uri->query); + if (uri->cleanup & 2) + uri->query = STRNDUP(*str, cur - *str); + else + uri->query = xmlURIUnescapeString(*str, cur - *str, NULL); + + /* Save the raw bytes of the query as well. + * See: http://mail.gnome.org/archives/xml/2007-April/thread.html#00114 + */ + if (uri->query_raw != NULL) + xmlFree (uri->query_raw); + uri->query_raw = STRNDUP (*str, cur - *str); + } + *str = cur; + return (0); +} + +/** + * xmlParse3986Port: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse a port part and fills in the appropriate fields + * of the @uri structure + * + * port = *DIGIT + * + * Returns 0 or the error code + */ +static int +xmlParse3986Port(xmlURIPtr uri, const char **str) +{ + const char *cur = *str; + int port = 0; + + if (ISA_DIGIT(cur)) { + while (ISA_DIGIT(cur)) { + port = port * 10 + (*cur - '0'); + if (port > 99999999) + port = 99999999; + + cur++; + } + if (uri != NULL) + uri->port = port; + *str = cur; + return(0); + } + return(1); +} + +/** + * xmlParse3986Userinfo: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an user informations part and fills in the appropriate fields + * of the @uri structure + * + * userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986Userinfo(xmlURIPtr uri, const char **str) +{ + const char *cur; + + cur = *str; + while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || + ISA_SUB_DELIM(cur) || (*cur == ':')) + NEXT(cur); + if (*cur == '@') { + if (uri != NULL) { + if (uri->user != NULL) xmlFree(uri->user); + if (uri->cleanup & 2) + uri->user = STRNDUP(*str, cur - *str); + else + uri->user = xmlURIUnescapeString(*str, cur - *str, NULL); + } + *str = cur; + return(0); + } + return(1); +} + +/** + * xmlParse3986DecOctet: + * @str: the string to analyze + * + * dec-octet = DIGIT ; 0-9 + * / %x31-39 DIGIT ; 10-99 + * / "1" 2DIGIT ; 100-199 + * / "2" %x30-34 DIGIT ; 200-249 + * / "25" %x30-35 ; 250-255 + * + * Skip a dec-octet. + * + * Returns 0 if found and skipped, 1 otherwise + */ +static int +xmlParse3986DecOctet(const char **str) { + const char *cur = *str; + + if (!(ISA_DIGIT(cur))) + return(1); + if (!ISA_DIGIT(cur+1)) + cur++; + else if ((*cur != '0') && (ISA_DIGIT(cur + 1)) && (!ISA_DIGIT(cur+2))) + cur += 2; + else if ((*cur == '1') && (ISA_DIGIT(cur + 1)) && (ISA_DIGIT(cur + 2))) + cur += 3; + else if ((*cur == '2') && (*(cur + 1) >= '0') && + (*(cur + 1) <= '4') && (ISA_DIGIT(cur + 2))) + cur += 3; + else if ((*cur == '2') && (*(cur + 1) == '5') && + (*(cur + 2) >= '0') && (*(cur + 1) <= '5')) + cur += 3; + else + return(1); + *str = cur; + return(0); +} +/** + * xmlParse3986Host: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an host part and fills in the appropriate fields + * of the @uri structure + * + * host = IP-literal / IPv4address / reg-name + * IP-literal = "[" ( IPv6address / IPvFuture ) "]" + * IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet + * reg-name = *( unreserved / pct-encoded / sub-delims ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986Host(xmlURIPtr uri, const char **str) +{ + const char *cur = *str; + const char *host; + + host = cur; + /* + * IPv6 and future addressing scheme are enclosed between brackets + */ + if (*cur == '[') { + cur++; + while ((*cur != ']') && (*cur != 0)) + cur++; + if (*cur != ']') + return(1); + cur++; + goto found; + } + /* + * try to parse an IPv4 + */ + if (ISA_DIGIT(cur)) { + if (xmlParse3986DecOctet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + cur++; + if (xmlParse3986DecOctet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + if (xmlParse3986DecOctet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + if (xmlParse3986DecOctet(&cur) != 0) + goto not_ipv4; + goto found; +not_ipv4: + cur = *str; + } + /* + * then this should be a hostname which can be empty + */ + while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || ISA_SUB_DELIM(cur)) + NEXT(cur); +found: + if (uri != NULL) { + if (uri->authority != NULL) xmlFree(uri->authority); + uri->authority = NULL; + if (uri->server != NULL) xmlFree(uri->server); + if (cur != host) { + if (uri->cleanup & 2) + uri->server = STRNDUP(host, cur - host); + else + uri->server = xmlURIUnescapeString(host, cur - host, NULL); + } else + uri->server = NULL; + } + *str = cur; + return(0); +} + +/** + * xmlParse3986Authority: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an authority part and fills in the appropriate fields + * of the @uri structure + * + * authority = [ userinfo "@" ] host [ ":" port ] + * + * Returns 0 or the error code + */ +static int +xmlParse3986Authority(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + /* + * try to parse an userinfo and check for the trailing @ + */ + ret = xmlParse3986Userinfo(uri, &cur); + if ((ret != 0) || (*cur != '@')) + cur = *str; + else + cur++; + ret = xmlParse3986Host(uri, &cur); + if (ret != 0) return(ret); + if (*cur == ':') { + cur++; + ret = xmlParse3986Port(uri, &cur); + if (ret != 0) return(ret); + } + *str = cur; + return(0); +} + +/** + * xmlParse3986Segment: + * @str: the string to analyze + * @forbid: an optional forbidden character + * @empty: allow an empty segment + * + * Parse a segment and fills in the appropriate fields + * of the @uri structure + * + * segment = *pchar + * segment-nz = 1*pchar + * segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" ) + * ; non-zero-length segment without any colon ":" + * + * Returns 0 or the error code + */ +static int +xmlParse3986Segment(const char **str, char forbid, int empty) +{ + const char *cur; + + cur = *str; + if (!ISA_PCHAR(cur)) { + if (empty) + return(0); + return(1); + } + while (ISA_PCHAR(cur) && (*cur != forbid)) + NEXT(cur); + *str = cur; + return (0); +} + +/** + * xmlParse3986PathAbEmpty: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path absolute or empty and fills in the appropriate fields + * of the @uri structure + * + * path-abempty = *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986PathAbEmpty(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + while (*cur == '/') { + cur++; + ret = xmlParse3986Segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + if (*str != cur) { + if (uri->cleanup & 2) + uri->path = STRNDUP(*str, cur - *str); + else + uri->path = xmlURIUnescapeString(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * xmlParse3986PathAbsolute: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path absolute and fills in the appropriate fields + * of the @uri structure + * + * path-absolute = "/" [ segment-nz *( "/" segment ) ] + * + * Returns 0 or the error code + */ +static int +xmlParse3986PathAbsolute(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + if (*cur != '/') + return(1); + cur++; + ret = xmlParse3986Segment(&cur, 0, 0); + if (ret == 0) { + while (*cur == '/') { + cur++; + ret = xmlParse3986Segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + } + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = STRNDUP(*str, cur - *str); + else + uri->path = xmlURIUnescapeString(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * xmlParse3986PathRootless: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path without root and fills in the appropriate fields + * of the @uri structure + * + * path-rootless = segment-nz *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986PathRootless(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + ret = xmlParse3986Segment(&cur, 0, 0); + if (ret != 0) return(ret); + while (*cur == '/') { + cur++; + ret = xmlParse3986Segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = STRNDUP(*str, cur - *str); + else + uri->path = xmlURIUnescapeString(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * xmlParse3986PathNoScheme: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path which is not a scheme and fills in the appropriate fields + * of the @uri structure + * + * path-noscheme = segment-nz-nc *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +xmlParse3986PathNoScheme(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + ret = xmlParse3986Segment(&cur, ':', 0); + if (ret != 0) return(ret); + while (*cur == '/') { + cur++; + ret = xmlParse3986Segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = STRNDUP(*str, cur - *str); + else + uri->path = xmlURIUnescapeString(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * xmlParse3986HierPart: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an hierarchical part and fills in the appropriate fields + * of the @uri structure + * + * hier-part = "//" authority path-abempty + * / path-absolute + * / path-rootless + * / path-empty + * + * Returns 0 or the error code + */ +static int +xmlParse3986HierPart(xmlURIPtr uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + if ((*cur == '/') && (*(cur + 1) == '/')) { + cur += 2; + ret = xmlParse3986Authority(uri, &cur); + if (ret != 0) return(ret); + if (uri->server == NULL) + uri->port = -1; + ret = xmlParse3986PathAbEmpty(uri, &cur); + if (ret != 0) return(ret); + *str = cur; + return(0); + } else if (*cur == '/') { + ret = xmlParse3986PathAbsolute(uri, &cur); + if (ret != 0) return(ret); + } else if (ISA_PCHAR(cur)) { + ret = xmlParse3986PathRootless(uri, &cur); + if (ret != 0) return(ret); + } else { + /* path-empty is effectively empty */ + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * xmlParse3986RelativeRef: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI string and fills in the appropriate fields + * of the @uri structure + * + * relative-ref = relative-part [ "?" query ] [ "#" fragment ] + * relative-part = "//" authority path-abempty + * / path-absolute + * / path-noscheme + * / path-empty + * + * Returns 0 or the error code + */ +static int +xmlParse3986RelativeRef(xmlURIPtr uri, const char *str) { + int ret; + + if ((*str == '/') && (*(str + 1) == '/')) { + str += 2; + ret = xmlParse3986Authority(uri, &str); + if (ret != 0) return(ret); + ret = xmlParse3986PathAbEmpty(uri, &str); + if (ret != 0) return(ret); + } else if (*str == '/') { + ret = xmlParse3986PathAbsolute(uri, &str); + if (ret != 0) return(ret); + } else if (ISA_PCHAR(str)) { + ret = xmlParse3986PathNoScheme(uri, &str); + if (ret != 0) return(ret); + } else { + /* path-empty is effectively empty */ + if (uri != NULL) { + if (uri->path != NULL) xmlFree(uri->path); + uri->path = NULL; + } + } + + if (*str == '?') { + str++; + ret = xmlParse3986Query(uri, &str); + if (ret != 0) return(ret); + } + if (*str == '#') { + str++; + ret = xmlParse3986Fragment(uri, &str); + if (ret != 0) return(ret); + } + if (*str != 0) { + xmlCleanURI(uri); + return(1); + } + return(0); +} + + +/** + * xmlParse3986URI: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI string and fills in the appropriate fields + * of the @uri structure + * + * scheme ":" hier-part [ "?" query ] [ "#" fragment ] + * + * Returns 0 or the error code + */ +static int +xmlParse3986URI(xmlURIPtr uri, const char *str) { + int ret; + + ret = xmlParse3986Scheme(uri, &str); + if (ret != 0) return(ret); + if (*str != ':') { + return(1); + } + str++; + ret = xmlParse3986HierPart(uri, &str); + if (ret != 0) return(ret); + if (*str == '?') { + str++; + ret = xmlParse3986Query(uri, &str); + if (ret != 0) return(ret); + } + if (*str == '#') { + str++; + ret = xmlParse3986Fragment(uri, &str); + if (ret != 0) return(ret); + } + if (*str != 0) { + xmlCleanURI(uri); + return(1); + } + return(0); +} + +/** + * xmlParse3986URIReference: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI reference string and fills in the appropriate fields + * of the @uri structure + * + * URI-reference = URI / relative-ref + * + * Returns 0 or the error code + */ +static int +xmlParse3986URIReference(xmlURIPtr uri, const char *str) { + int ret; + + if (str == NULL) + return(-1); + xmlCleanURI(uri); + + /* + * Try first to parse absolute refs, then fallback to relative if + * it fails. + */ + ret = xmlParse3986URI(uri, str); + if (ret != 0) { + xmlCleanURI(uri); + ret = xmlParse3986RelativeRef(uri, str); + if (ret != 0) { + xmlCleanURI(uri); + return(ret); + } + } + return(0); +} + +/** + * xmlParseURI: + * @str: the URI string to analyze + * + * Parse an URI based on RFC 3986 + * + * URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ] + * + * Returns a newly built xmlURIPtr or NULL in case of error + */ +xmlURIPtr +xmlParseURI(const char *str) { + xmlURIPtr uri; + int ret; + + if (str == NULL) + return(NULL); + uri = xmlCreateURI(); + if (uri != NULL) { + ret = xmlParse3986URIReference(uri, str); + if (ret) { + xmlFreeURI(uri); + return(NULL); + } + } + return(uri); +} + +/** + * xmlParseURIReference: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI reference string based on RFC 3986 and fills in the + * appropriate fields of the @uri structure + * + * URI-reference = URI / relative-ref + * + * Returns 0 or the error code + */ +int +xmlParseURIReference(xmlURIPtr uri, const char *str) { + return(xmlParse3986URIReference(uri, str)); +} + +/** + * xmlParseURIRaw: + * @str: the URI string to analyze + * @raw: if 1 unescaping of URI pieces are disabled + * + * Parse an URI but allows to keep intact the original fragments. + * + * URI-reference = URI / relative-ref + * + * Returns a newly built xmlURIPtr or NULL in case of error + */ +xmlURIPtr +xmlParseURIRaw(const char *str, int raw) { + xmlURIPtr uri; + int ret; + + if (str == NULL) + return(NULL); + uri = xmlCreateURI(); + if (uri != NULL) { + if (raw) { + uri->cleanup |= 2; + } + ret = xmlParseURIReference(uri, str); + if (ret) { + xmlFreeURI(uri); + return(NULL); + } + } + return(uri); +} + +/************************************************************************ + * * + * Generic URI structure functions * + * * + ************************************************************************/ + +/** + * xmlCreateURI: + * + * Simply creates an empty xmlURI + * + * Returns the new structure or NULL in case of error + */ +xmlURIPtr +xmlCreateURI(void) { + xmlURIPtr ret; + + ret = (xmlURIPtr) xmlMalloc(sizeof(xmlURI)); + if (ret == NULL) { + xmlURIErrMemory("creating URI structure\n"); + return(NULL); + } + memset(ret, 0, sizeof(xmlURI)); + return(ret); +} + +/** + * xmlSaveUriRealloc: + * + * Function to handle properly a reallocation when saving an URI + * Also imposes some limit on the length of an URI string output + */ +static xmlChar * +xmlSaveUriRealloc(xmlChar *ret, int *max) { + xmlChar *temp; + int tmp; + + if (*max > MAX_URI_LENGTH) { + xmlURIErrMemory("reaching arbitrary MAX_URI_LENGTH limit\n"); + return(NULL); + } + tmp = *max * 2; + temp = (xmlChar *) xmlRealloc(ret, (tmp + 1)); + if (temp == NULL) { + xmlURIErrMemory("saving URI\n"); + return(NULL); + } + *max = tmp; + return(temp); +} + +/** + * xmlSaveUri: + * @uri: pointer to an xmlURI + * + * Save the URI as an escaped string + * + * Returns a new string (to be deallocated by caller) + */ +xmlChar * +xmlSaveUri(xmlURIPtr uri) { + xmlChar *ret = NULL; + xmlChar *temp; + const char *p; + int len; + int max; + + if (uri == NULL) return(NULL); + + + max = 80; + ret = (xmlChar *) xmlMallocAtomic((max + 1) * sizeof(xmlChar)); + if (ret == NULL) { + xmlURIErrMemory("saving URI\n"); + return(NULL); + } + len = 0; + + if (uri->scheme != NULL) { + p = uri->scheme; + while (*p != 0) { + if (len >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + if (len >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = ':'; + } + if (uri->opaque != NULL) { + p = uri->opaque; + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if (IS_RESERVED(*(p)) || IS_UNRESERVED(*(p))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } else { + if ((uri->server != NULL) || (uri->port == -1)) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '/'; + ret[len++] = '/'; + if (uri->user != NULL) { + p = uri->user; + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || + ((*(p) == ';')) || ((*(p) == ':')) || + ((*(p) == '&')) || ((*(p) == '=')) || + ((*(p) == '+')) || ((*(p) == '$')) || + ((*(p) == ','))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '@'; + } + if (uri->server != NULL) { + p = uri->server; + while (*p != 0) { + if (len >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + if (uri->port > 0) { + if (len + 10 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + len += snprintf((char *) &ret[len], max - len, ":%d", uri->port); + } + } + } else if (uri->authority != NULL) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '/'; + ret[len++] = '/'; + p = uri->authority; + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || + ((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) || + ((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) || + ((*(p) == '=')) || ((*(p) == '+'))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } else if (uri->scheme != NULL) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + } + if (uri->path != NULL) { + p = uri->path; + /* + * the colon in file:///d: should not be escaped or + * Windows accesses fail later. + */ + if ((uri->scheme != NULL) && + (p[0] == '/') && + (((p[1] >= 'a') && (p[1] <= 'z')) || + ((p[1] >= 'A') && (p[1] <= 'Z'))) && + (p[2] == ':') && + (xmlStrEqual(BAD_CAST uri->scheme, BAD_CAST "file"))) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + ret[len++] = *p++; + ret[len++] = *p++; + } + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) || + ((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) || + ((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) || + ((*(p) == ','))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } + if (uri->query_raw != NULL) { + if (len + 1 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '?'; + p = uri->query_raw; + while (*p != 0) { + if (len + 1 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + } else if (uri->query != NULL) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '?'; + p = uri->query; + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p)))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } + } + if (uri->fragment != NULL) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '#'; + p = uri->fragment; + while (*p != 0) { + if (len + 3 >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p)))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } + if (len >= max) { + temp = xmlSaveUriRealloc(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len] = 0; + return(ret); + +mem_error: + xmlFree(ret); + return(NULL); +} + +/** + * xmlPrintURI: + * @stream: a FILE* for the output + * @uri: pointer to an xmlURI + * + * Prints the URI in the stream @stream. + */ +void +xmlPrintURI(FILE *stream, xmlURIPtr uri) { + xmlChar *out; + + out = xmlSaveUri(uri); + if (out != NULL) { + fprintf(stream, "%s", (char *) out); + xmlFree(out); + } +} + +/** + * xmlCleanURI: + * @uri: pointer to an xmlURI + * + * Make sure the xmlURI struct is free of content + */ +static void +xmlCleanURI(xmlURIPtr uri) { + if (uri == NULL) return; + + if (uri->scheme != NULL) xmlFree(uri->scheme); + uri->scheme = NULL; + if (uri->server != NULL) xmlFree(uri->server); + uri->server = NULL; + if (uri->user != NULL) xmlFree(uri->user); + uri->user = NULL; + if (uri->path != NULL) xmlFree(uri->path); + uri->path = NULL; + if (uri->fragment != NULL) xmlFree(uri->fragment); + uri->fragment = NULL; + if (uri->opaque != NULL) xmlFree(uri->opaque); + uri->opaque = NULL; + if (uri->authority != NULL) xmlFree(uri->authority); + uri->authority = NULL; + if (uri->query != NULL) xmlFree(uri->query); + uri->query = NULL; + if (uri->query_raw != NULL) xmlFree(uri->query_raw); + uri->query_raw = NULL; +} + +/** + * xmlFreeURI: + * @uri: pointer to an xmlURI + * + * Free up the xmlURI struct + */ +void +xmlFreeURI(xmlURIPtr uri) { + if (uri == NULL) return; + + if (uri->scheme != NULL) xmlFree(uri->scheme); + if (uri->server != NULL) xmlFree(uri->server); + if (uri->user != NULL) xmlFree(uri->user); + if (uri->path != NULL) xmlFree(uri->path); + if (uri->fragment != NULL) xmlFree(uri->fragment); + if (uri->opaque != NULL) xmlFree(uri->opaque); + if (uri->authority != NULL) xmlFree(uri->authority); + if (uri->query != NULL) xmlFree(uri->query); + if (uri->query_raw != NULL) xmlFree(uri->query_raw); + xmlFree(uri); +} + +/************************************************************************ + * * + * Helper functions * + * * + ************************************************************************/ + +/** + * xmlNormalizeURIPath: + * @path: pointer to the path string + * + * Applies the 5 normalization steps to a path string--that is, RFC 2396 + * Section 5.2, steps 6.c through 6.g. + * + * Normalization occurs directly on the string, no new allocation is done + * + * Returns 0 or an error code + */ +int +xmlNormalizeURIPath(char *path) { + char *cur, *out; + + if (path == NULL) + return(-1); + + /* Skip all initial "/" chars. We want to get to the beginning of the + * first non-empty segment. + */ + cur = path; + while (cur[0] == '/') + ++cur; + if (cur[0] == '\0') + return(0); + + /* Keep everything we've seen so far. */ + out = cur; + + /* + * Analyze each segment in sequence for cases (c) and (d). + */ + while (cur[0] != '\0') { + /* + * c) All occurrences of "./", where "." is a complete path segment, + * are removed from the buffer string. + */ + if ((cur[0] == '.') && (cur[1] == '/')) { + cur += 2; + /* '//' normalization should be done at this point too */ + while (cur[0] == '/') + cur++; + continue; + } + + /* + * d) If the buffer string ends with "." as a complete path segment, + * that "." is removed. + */ + if ((cur[0] == '.') && (cur[1] == '\0')) + break; + + /* Otherwise keep the segment. */ + while (cur[0] != '/') { + if (cur[0] == '\0') + goto done_cd; + (out++)[0] = (cur++)[0]; + } + /* normalize // */ + while ((cur[0] == '/') && (cur[1] == '/')) + cur++; + + (out++)[0] = (cur++)[0]; + } + done_cd: + out[0] = '\0'; + + /* Reset to the beginning of the first segment for the next sequence. */ + cur = path; + while (cur[0] == '/') + ++cur; + if (cur[0] == '\0') + return(0); + + /* + * Analyze each segment in sequence for cases (e) and (f). + * + * e) All occurrences of "/../", where is a + * complete path segment not equal to "..", are removed from the + * buffer string. Removal of these path segments is performed + * iteratively, removing the leftmost matching pattern on each + * iteration, until no matching pattern remains. + * + * f) If the buffer string ends with "/..", where + * is a complete path segment not equal to "..", that + * "/.." is removed. + * + * To satisfy the "iterative" clause in (e), we need to collapse the + * string every time we find something that needs to be removed. Thus, + * we don't need to keep two pointers into the string: we only need a + * "current position" pointer. + */ + while (1) { + char *segp, *tmp; + + /* At the beginning of each iteration of this loop, "cur" points to + * the first character of the segment we want to examine. + */ + + /* Find the end of the current segment. */ + segp = cur; + while ((segp[0] != '/') && (segp[0] != '\0')) + ++segp; + + /* If this is the last segment, we're done (we need at least two + * segments to meet the criteria for the (e) and (f) cases). + */ + if (segp[0] == '\0') + break; + + /* If the first segment is "..", or if the next segment _isn't_ "..", + * keep this segment and try the next one. + */ + ++segp; + if (((cur[0] == '.') && (cur[1] == '.') && (segp == cur+3)) + || ((segp[0] != '.') || (segp[1] != '.') + || ((segp[2] != '/') && (segp[2] != '\0')))) { + cur = segp; + continue; + } + + /* If we get here, remove this segment and the next one and back up + * to the previous segment (if there is one), to implement the + * "iteratively" clause. It's pretty much impossible to back up + * while maintaining two pointers into the buffer, so just compact + * the whole buffer now. + */ + + /* If this is the end of the buffer, we're done. */ + if (segp[2] == '\0') { + cur[0] = '\0'; + break; + } + /* Valgrind complained, strcpy(cur, segp + 3); */ + /* string will overlap, do not use strcpy */ + tmp = cur; + segp += 3; + while ((*tmp++ = *segp++) != 0) + ; + + /* If there are no previous segments, then keep going from here. */ + segp = cur; + while ((segp > path) && ((--segp)[0] == '/')) + ; + if (segp == path) + continue; + + /* "segp" is pointing to the end of a previous segment; find it's + * start. We need to back up to the previous segment and start + * over with that to handle things like "foo/bar/../..". If we + * don't do this, then on the first pass we'll remove the "bar/..", + * but be pointing at the second ".." so we won't realize we can also + * remove the "foo/..". + */ + cur = segp; + while ((cur > path) && (cur[-1] != '/')) + --cur; + } + out[0] = '\0'; + + /* + * g) If the resulting buffer string still begins with one or more + * complete path segments of "..", then the reference is + * considered to be in error. Implementations may handle this + * error by retaining these components in the resolved path (i.e., + * treating them as part of the final URI), by removing them from + * the resolved path (i.e., discarding relative levels above the + * root), or by avoiding traversal of the reference. + * + * We discard them from the final path. + */ + if (path[0] == '/') { + cur = path; + while ((cur[0] == '/') && (cur[1] == '.') && (cur[2] == '.') + && ((cur[3] == '/') || (cur[3] == '\0'))) + cur += 3; + + if (cur != path) { + out = path; + while (cur[0] != '\0') + (out++)[0] = (cur++)[0]; + out[0] = 0; + } + } + + return(0); +} + +static int is_hex(char c) { + if (((c >= '0') && (c <= '9')) || + ((c >= 'a') && (c <= 'f')) || + ((c >= 'A') && (c <= 'F'))) + return(1); + return(0); +} + +/** + * xmlURIUnescapeString: + * @str: the string to unescape + * @len: the length in bytes to unescape (or <= 0 to indicate full string) + * @target: optional destination buffer + * + * Unescaping routine, but does not check that the string is an URI. The + * output is a direct unsigned char translation of %XX values (no encoding) + * Note that the length of the result can only be smaller or same size as + * the input string. + * + * Returns a copy of the string, but unescaped, will return NULL only in case + * of error + */ +char * +xmlURIUnescapeString(const char *str, int len, char *target) { + char *ret, *out; + const char *in; + + if (str == NULL) + return(NULL); + if (len <= 0) len = strlen(str); + if (len < 0) return(NULL); + + if (target == NULL) { + ret = (char *) xmlMallocAtomic(len + 1); + if (ret == NULL) { + xmlURIErrMemory("unescaping URI value\n"); + return(NULL); + } + } else + ret = target; + in = str; + out = ret; + while(len > 0) { + if ((len > 2) && (*in == '%') && (is_hex(in[1])) && (is_hex(in[2]))) { + in++; + if ((*in >= '0') && (*in <= '9')) + *out = (*in - '0'); + else if ((*in >= 'a') && (*in <= 'f')) + *out = (*in - 'a') + 10; + else if ((*in >= 'A') && (*in <= 'F')) + *out = (*in - 'A') + 10; + in++; + if ((*in >= '0') && (*in <= '9')) + *out = *out * 16 + (*in - '0'); + else if ((*in >= 'a') && (*in <= 'f')) + *out = *out * 16 + (*in - 'a') + 10; + else if ((*in >= 'A') && (*in <= 'F')) + *out = *out * 16 + (*in - 'A') + 10; + in++; + len -= 3; + out++; + } else { + *out++ = *in++; + len--; + } + } + *out = 0; + return(ret); +} + +/** + * xmlURIEscapeStr: + * @str: string to escape + * @list: exception list string of chars not to escape + * + * This routine escapes a string to hex, ignoring reserved characters (a-z) + * and the characters in the exception list. + * + * Returns a new escaped string or NULL in case of error. + */ +xmlChar * +xmlURIEscapeStr(const xmlChar *str, const xmlChar *list) { + xmlChar *ret, ch; + xmlChar *temp; + const xmlChar *in; + int len, out; + + if (str == NULL) + return(NULL); + if (str[0] == 0) + return(xmlStrdup(str)); + len = xmlStrlen(str); + if (!(len > 0)) return(NULL); + + len += 20; + ret = (xmlChar *) xmlMallocAtomic(len); + if (ret == NULL) { + xmlURIErrMemory("escaping URI value\n"); + return(NULL); + } + in = (const xmlChar *) str; + out = 0; + while(*in != 0) { + if (len - out <= 3) { + temp = xmlSaveUriRealloc(ret, &len); + if (temp == NULL) { + xmlURIErrMemory("escaping URI value\n"); + xmlFree(ret); + return(NULL); + } + ret = temp; + } + + ch = *in; + + if ((ch != '@') && (!IS_UNRESERVED(ch)) && (!xmlStrchr(list, ch))) { + unsigned char val; + ret[out++] = '%'; + val = ch >> 4; + if (val <= 9) + ret[out++] = '0' + val; + else + ret[out++] = 'A' + val - 0xA; + val = ch & 0xF; + if (val <= 9) + ret[out++] = '0' + val; + else + ret[out++] = 'A' + val - 0xA; + in++; + } else { + ret[out++] = *in++; + } + + } + ret[out] = 0; + return(ret); +} + +/** + * xmlURIEscape: + * @str: the string of the URI to escape + * + * Escaping routine, does not do validity checks ! + * It will try to escape the chars needing this, but this is heuristic + * based it's impossible to be sure. + * + * Returns an copy of the string, but escaped + * + * 25 May 2001 + * Uses xmlParseURI and xmlURIEscapeStr to try to escape correctly + * according to RFC2396. + * - Carl Douglas + */ +xmlChar * +xmlURIEscape(const xmlChar * str) +{ + xmlChar *ret, *segment = NULL; + xmlURIPtr uri; + int ret2; + +#define NULLCHK(p) if(!p) { \ + xmlURIErrMemory("escaping URI value\n"); \ + xmlFreeURI(uri); \ + return NULL; } \ + + if (str == NULL) + return (NULL); + + uri = xmlCreateURI(); + if (uri != NULL) { + /* + * Allow escaping errors in the unescaped form + */ + uri->cleanup = 1; + ret2 = xmlParseURIReference(uri, (const char *)str); + if (ret2) { + xmlFreeURI(uri); + return (NULL); + } + } + + if (!uri) + return NULL; + + ret = NULL; + + if (uri->scheme) { + segment = xmlURIEscapeStr(BAD_CAST uri->scheme, BAD_CAST "+-."); + NULLCHK(segment) + ret = xmlStrcat(ret, segment); + ret = xmlStrcat(ret, BAD_CAST ":"); + xmlFree(segment); + } + + if (uri->authority) { + segment = + xmlURIEscapeStr(BAD_CAST uri->authority, BAD_CAST "/?;:@"); + NULLCHK(segment) + ret = xmlStrcat(ret, BAD_CAST "//"); + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + if (uri->user) { + segment = xmlURIEscapeStr(BAD_CAST uri->user, BAD_CAST ";:&=+$,"); + NULLCHK(segment) + ret = xmlStrcat(ret,BAD_CAST "//"); + ret = xmlStrcat(ret, segment); + ret = xmlStrcat(ret, BAD_CAST "@"); + xmlFree(segment); + } + + if (uri->server) { + segment = xmlURIEscapeStr(BAD_CAST uri->server, BAD_CAST "/?;:@"); + NULLCHK(segment) + if (uri->user == NULL) + ret = xmlStrcat(ret, BAD_CAST "//"); + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + if (uri->port) { + xmlChar port[10]; + + snprintf((char *) port, 10, "%d", uri->port); + ret = xmlStrcat(ret, BAD_CAST ":"); + ret = xmlStrcat(ret, port); + } + + if (uri->path) { + segment = + xmlURIEscapeStr(BAD_CAST uri->path, BAD_CAST ":@&=+$,/?;"); + NULLCHK(segment) + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + if (uri->query_raw) { + ret = xmlStrcat(ret, BAD_CAST "?"); + ret = xmlStrcat(ret, BAD_CAST uri->query_raw); + } + else if (uri->query) { + segment = + xmlURIEscapeStr(BAD_CAST uri->query, BAD_CAST ";/?:@&=+,$"); + NULLCHK(segment) + ret = xmlStrcat(ret, BAD_CAST "?"); + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + if (uri->opaque) { + segment = xmlURIEscapeStr(BAD_CAST uri->opaque, BAD_CAST ""); + NULLCHK(segment) + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + if (uri->fragment) { + segment = xmlURIEscapeStr(BAD_CAST uri->fragment, BAD_CAST "#"); + NULLCHK(segment) + ret = xmlStrcat(ret, BAD_CAST "#"); + ret = xmlStrcat(ret, segment); + xmlFree(segment); + } + + xmlFreeURI(uri); +#undef NULLCHK + + return (ret); +} + +/************************************************************************ + * * + * Public functions * + * * + ************************************************************************/ + +/** + * xmlBuildURI: + * @URI: the URI instance found in the document + * @base: the base value + * + * Computes he final URI of the reference done by checking that + * the given URI is valid, and building the final URI using the + * base URI. This is processed according to section 5.2 of the + * RFC 2396 + * + * 5.2. Resolving Relative References to Absolute Form + * + * Returns a new URI string (to be freed by the caller) or NULL in case + * of error. + */ +xmlChar * +xmlBuildURI(const xmlChar *URI, const xmlChar *base) { + xmlChar *val = NULL; + int ret, len, indx, cur, out; + xmlURIPtr ref = NULL; + xmlURIPtr bas = NULL; + xmlURIPtr res = NULL; + + /* + * 1) The URI reference is parsed into the potential four components and + * fragment identifier, as described in Section 4.3. + * + * NOTE that a completely empty URI is treated by modern browsers + * as a reference to "." rather than as a synonym for the current + * URI. Should we do that here? + */ + if (URI == NULL) + ret = -1; + else { + if (*URI) { + ref = xmlCreateURI(); + if (ref == NULL) + goto done; + ret = xmlParseURIReference(ref, (const char *) URI); + } + else + ret = 0; + } + if (ret != 0) + goto done; + if ((ref != NULL) && (ref->scheme != NULL)) { + /* + * The URI is absolute don't modify. + */ + val = xmlStrdup(URI); + goto done; + } + if (base == NULL) + ret = -1; + else { + bas = xmlCreateURI(); + if (bas == NULL) + goto done; + ret = xmlParseURIReference(bas, (const char *) base); + } + if (ret != 0) { + if (ref) + val = xmlSaveUri(ref); + goto done; + } + if (ref == NULL) { + /* + * the base fragment must be ignored + */ + if (bas->fragment != NULL) { + xmlFree(bas->fragment); + bas->fragment = NULL; + } + val = xmlSaveUri(bas); + goto done; + } + + /* + * 2) If the path component is empty and the scheme, authority, and + * query components are undefined, then it is a reference to the + * current document and we are done. Otherwise, the reference URI's + * query and fragment components are defined as found (or not found) + * within the URI reference and not inherited from the base URI. + * + * NOTE that in modern browsers, the parsing differs from the above + * in the following aspect: the query component is allowed to be + * defined while still treating this as a reference to the current + * document. + */ + res = xmlCreateURI(); + if (res == NULL) + goto done; + if ((ref->scheme == NULL) && (ref->path == NULL) && + ((ref->authority == NULL) && (ref->server == NULL))) { + if (bas->scheme != NULL) + res->scheme = xmlMemStrdup(bas->scheme); + if (bas->authority != NULL) + res->authority = xmlMemStrdup(bas->authority); + else if ((bas->server != NULL) || (bas->port == -1)) { + if (bas->server != NULL) + res->server = xmlMemStrdup(bas->server); + if (bas->user != NULL) + res->user = xmlMemStrdup(bas->user); + res->port = bas->port; + } + if (bas->path != NULL) + res->path = xmlMemStrdup(bas->path); + if (ref->query_raw != NULL) + res->query_raw = xmlMemStrdup (ref->query_raw); + else if (ref->query != NULL) + res->query = xmlMemStrdup(ref->query); + else if (bas->query_raw != NULL) + res->query_raw = xmlMemStrdup(bas->query_raw); + else if (bas->query != NULL) + res->query = xmlMemStrdup(bas->query); + if (ref->fragment != NULL) + res->fragment = xmlMemStrdup(ref->fragment); + goto step_7; + } + + /* + * 3) If the scheme component is defined, indicating that the reference + * starts with a scheme name, then the reference is interpreted as an + * absolute URI and we are done. Otherwise, the reference URI's + * scheme is inherited from the base URI's scheme component. + */ + if (ref->scheme != NULL) { + val = xmlSaveUri(ref); + goto done; + } + if (bas->scheme != NULL) + res->scheme = xmlMemStrdup(bas->scheme); + + if (ref->query_raw != NULL) + res->query_raw = xmlMemStrdup(ref->query_raw); + else if (ref->query != NULL) + res->query = xmlMemStrdup(ref->query); + if (ref->fragment != NULL) + res->fragment = xmlMemStrdup(ref->fragment); + + /* + * 4) If the authority component is defined, then the reference is a + * network-path and we skip to step 7. Otherwise, the reference + * URI's authority is inherited from the base URI's authority + * component, which will also be undefined if the URI scheme does not + * use an authority component. + */ + if ((ref->authority != NULL) || (ref->server != NULL)) { + if (ref->authority != NULL) + res->authority = xmlMemStrdup(ref->authority); + else { + res->server = xmlMemStrdup(ref->server); + if (ref->user != NULL) + res->user = xmlMemStrdup(ref->user); + res->port = ref->port; + } + if (ref->path != NULL) + res->path = xmlMemStrdup(ref->path); + goto step_7; + } + if (bas->authority != NULL) + res->authority = xmlMemStrdup(bas->authority); + else if ((bas->server != NULL) || (bas->port == -1)) { + if (bas->server != NULL) + res->server = xmlMemStrdup(bas->server); + if (bas->user != NULL) + res->user = xmlMemStrdup(bas->user); + res->port = bas->port; + } + + /* + * 5) If the path component begins with a slash character ("/"), then + * the reference is an absolute-path and we skip to step 7. + */ + if ((ref->path != NULL) && (ref->path[0] == '/')) { + res->path = xmlMemStrdup(ref->path); + goto step_7; + } + + + /* + * 6) If this step is reached, then we are resolving a relative-path + * reference. The relative path needs to be merged with the base + * URI's path. Although there are many ways to do this, we will + * describe a simple method using a separate string buffer. + * + * Allocate a buffer large enough for the result string. + */ + len = 2; /* extra / and 0 */ + if (ref->path != NULL) + len += strlen(ref->path); + if (bas->path != NULL) + len += strlen(bas->path); + res->path = (char *) xmlMallocAtomic(len); + if (res->path == NULL) { + xmlURIErrMemory("resolving URI against base\n"); + goto done; + } + res->path[0] = 0; + + /* + * a) All but the last segment of the base URI's path component is + * copied to the buffer. In other words, any characters after the + * last (right-most) slash character, if any, are excluded. + */ + cur = 0; + out = 0; + if (bas->path != NULL) { + while (bas->path[cur] != 0) { + while ((bas->path[cur] != 0) && (bas->path[cur] != '/')) + cur++; + if (bas->path[cur] == 0) + break; + + cur++; + while (out < cur) { + res->path[out] = bas->path[out]; + out++; + } + } + } + res->path[out] = 0; + + /* + * b) The reference's path component is appended to the buffer + * string. + */ + if (ref->path != NULL && ref->path[0] != 0) { + indx = 0; + /* + * Ensure the path includes a '/' + */ + if ((out == 0) && (bas->server != NULL)) + res->path[out++] = '/'; + while (ref->path[indx] != 0) { + res->path[out++] = ref->path[indx++]; + } + } + res->path[out] = 0; + + /* + * Steps c) to h) are really path normalization steps + */ + xmlNormalizeURIPath(res->path); + +step_7: + + /* + * 7) The resulting URI components, including any inherited from the + * base URI, are recombined to give the absolute form of the URI + * reference. + */ + val = xmlSaveUri(res); + +done: + if (ref != NULL) + xmlFreeURI(ref); + if (bas != NULL) + xmlFreeURI(bas); + if (res != NULL) + xmlFreeURI(res); + return(val); +} + +/** + * xmlBuildRelativeURI: + * @URI: the URI reference under consideration + * @base: the base value + * + * Expresses the URI of the reference in terms relative to the + * base. Some examples of this operation include: + * base = "http://site1.com/docs/book1.html" + * URI input URI returned + * docs/pic1.gif pic1.gif + * docs/img/pic1.gif img/pic1.gif + * img/pic1.gif ../img/pic1.gif + * http://site1.com/docs/pic1.gif pic1.gif + * http://site2.com/docs/pic1.gif http://site2.com/docs/pic1.gif + * + * base = "docs/book1.html" + * URI input URI returned + * docs/pic1.gif pic1.gif + * docs/img/pic1.gif img/pic1.gif + * img/pic1.gif ../img/pic1.gif + * http://site1.com/docs/pic1.gif http://site1.com/docs/pic1.gif + * + * + * Note: if the URI reference is really weird or complicated, it may be + * worthwhile to first convert it into a "nice" one by calling + * xmlBuildURI (using 'base') before calling this routine, + * since this routine (for reasonable efficiency) assumes URI has + * already been through some validation. + * + * Returns a new URI string (to be freed by the caller) or NULL in case + * error. + */ +xmlChar * +xmlBuildRelativeURI (const xmlChar * URI, const xmlChar * base) +{ + xmlChar *val = NULL; + int ret; + int ix; + int nbslash = 0; + int len; + xmlURIPtr ref = NULL; + xmlURIPtr bas = NULL; + xmlChar *bptr, *uptr, *vptr; + int remove_path = 0; + + if ((URI == NULL) || (*URI == 0)) + return NULL; + + /* + * First parse URI into a standard form + */ + ref = xmlCreateURI (); + if (ref == NULL) + return NULL; + /* If URI not already in "relative" form */ + if (URI[0] != '.') { + ret = xmlParseURIReference (ref, (const char *) URI); + if (ret != 0) + goto done; /* Error in URI, return NULL */ + } else + ref->path = (char *)xmlStrdup(URI); + + /* + * Next parse base into the same standard form + */ + if ((base == NULL) || (*base == 0)) { + val = xmlStrdup (URI); + goto done; + } + bas = xmlCreateURI (); + if (bas == NULL) + goto done; + if (base[0] != '.') { + ret = xmlParseURIReference (bas, (const char *) base); + if (ret != 0) + goto done; /* Error in base, return NULL */ + } else + bas->path = (char *)xmlStrdup(base); + + /* + * If the scheme / server on the URI differs from the base, + * just return the URI + */ + if ((ref->scheme != NULL) && + ((bas->scheme == NULL) || + (xmlStrcmp ((xmlChar *)bas->scheme, (xmlChar *)ref->scheme)) || + (xmlStrcmp ((xmlChar *)bas->server, (xmlChar *)ref->server)))) { + val = xmlStrdup (URI); + goto done; + } + if (xmlStrEqual((xmlChar *)bas->path, (xmlChar *)ref->path)) { + val = xmlStrdup(BAD_CAST ""); + goto done; + } + if (bas->path == NULL) { + val = xmlStrdup((xmlChar *)ref->path); + goto done; + } + if (ref->path == NULL) { + ref->path = (char *) "/"; + remove_path = 1; + } + + /* + * At this point (at last!) we can compare the two paths + * + * First we take care of the special case where either of the + * two path components may be missing (bug 316224) + */ + bptr = (xmlChar *)bas->path; + { + xmlChar *rptr = (xmlChar *) ref->path; + int pos = 0; + + /* + * Next we compare the two strings and find where they first differ + */ + if ((*rptr == '.') && (rptr[1] == '/')) + rptr += 2; + if ((*bptr == '.') && (bptr[1] == '/')) + bptr += 2; + else if ((*bptr == '/') && (*rptr != '/')) + bptr++; + while ((bptr[pos] == rptr[pos]) && (bptr[pos] != 0)) + pos++; + + if (bptr[pos] == rptr[pos]) { + val = xmlStrdup(BAD_CAST ""); + goto done; /* (I can't imagine why anyone would do this) */ + } + + /* + * In URI, "back up" to the last '/' encountered. This will be the + * beginning of the "unique" suffix of URI + */ + ix = pos; + for (; ix > 0; ix--) { + if (rptr[ix - 1] == '/') + break; + } + uptr = (xmlChar *)&rptr[ix]; + + /* + * In base, count the number of '/' from the differing point + */ + for (; bptr[ix] != 0; ix++) { + if (bptr[ix] == '/') + nbslash++; + } + + /* + * e.g: URI="foo/" base="foo/bar" -> "./" + */ + if (nbslash == 0 && !uptr[0]) { + val = xmlStrdup(BAD_CAST "./"); + goto done; + } + + len = xmlStrlen (uptr) + 1; + } + + if (nbslash == 0) { + if (uptr != NULL) + /* exception characters from xmlSaveUri */ + val = xmlURIEscapeStr(uptr, BAD_CAST "/;&=+$,"); + goto done; + } + + /* + * Allocate just enough space for the returned string - + * length of the remainder of the URI, plus enough space + * for the "../" groups, plus one for the terminator + */ + val = (xmlChar *) xmlMalloc (len + 3 * nbslash); + if (val == NULL) { + xmlURIErrMemory("building relative URI\n"); + goto done; + } + vptr = val; + /* + * Put in as many "../" as needed + */ + for (; nbslash>0; nbslash--) { + *vptr++ = '.'; + *vptr++ = '.'; + *vptr++ = '/'; + } + /* + * Finish up with the end of the URI + */ + if (uptr != NULL) { + if ((vptr > val) && (len > 0) && + (uptr[0] == '/') && (vptr[-1] == '/')) { + memcpy (vptr, uptr + 1, len - 1); + vptr[len - 2] = 0; + } else { + memcpy (vptr, uptr, len); + vptr[len - 1] = 0; + } + } else { + vptr[len - 1] = 0; + } + + /* escape the freshly-built path */ + vptr = val; + /* exception characters from xmlSaveUri */ + val = xmlURIEscapeStr(vptr, BAD_CAST "/;&=+$,"); + xmlFree(vptr); + +done: + /* + * Free the working variables + */ + if (remove_path != 0) + ref->path = NULL; + if (ref != NULL) + xmlFreeURI (ref); + if (bas != NULL) + xmlFreeURI (bas); + + return val; +} + +/** + * xmlCanonicPath: + * @path: the resource locator in a filesystem notation + * + * Constructs a canonic path from the specified path. + * + * Returns a new canonic path, or a duplicate of the path parameter if the + * construction fails. The caller is responsible for freeing the memory occupied + * by the returned string. If there is insufficient memory available, or the + * argument is NULL, the function returns NULL. + */ +#define IS_WINDOWS_PATH(p) \ + ((p != NULL) && \ + (((p[0] >= 'a') && (p[0] <= 'z')) || \ + ((p[0] >= 'A') && (p[0] <= 'Z'))) && \ + (p[1] == ':') && ((p[2] == '/') || (p[2] == '\\'))) +xmlChar * +xmlCanonicPath(const xmlChar *path) +{ +/* + * For Windows implementations, additional work needs to be done to + * replace backslashes in pathnames with "forward slashes" + */ +#if defined(_WIN32) && !defined(__CYGWIN__) + int len = 0; + char *p = NULL; +#endif + xmlURIPtr uri; + xmlChar *ret; + const xmlChar *absuri; + + if (path == NULL) + return(NULL); + +#if defined(_WIN32) + /* + * We must not change the backslashes to slashes if the the path + * starts with \\?\ + * Those paths can be up to 32k characters long. + * Was added specifically for OpenOffice, those paths can't be converted + * to URIs anyway. + */ + if ((path[0] == '\\') && (path[1] == '\\') && (path[2] == '?') && + (path[3] == '\\') ) + return xmlStrdup((const xmlChar *) path); +#endif + + /* sanitize filename starting with // so it can be used as URI */ + if ((path[0] == '/') && (path[1] == '/') && (path[2] != '/')) + path++; + + if ((uri = xmlParseURI((const char *) path)) != NULL) { + xmlFreeURI(uri); + return xmlStrdup(path); + } + + /* Check if this is an "absolute uri" */ + absuri = xmlStrstr(path, BAD_CAST "://"); + if (absuri != NULL) { + int l, j; + unsigned char c; + xmlChar *escURI; + + /* + * this looks like an URI where some parts have not been + * escaped leading to a parsing problem. Check that the first + * part matches a protocol. + */ + l = absuri - path; + /* Bypass if first part (part before the '://') is > 20 chars */ + if ((l <= 0) || (l > 20)) + goto path_processing; + /* Bypass if any non-alpha characters are present in first part */ + for (j = 0;j < l;j++) { + c = path[j]; + if (!(((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')))) + goto path_processing; + } + + /* Escape all except the characters specified in the supplied path */ + escURI = xmlURIEscapeStr(path, BAD_CAST ":/?_.#&;="); + if (escURI != NULL) { + /* Try parsing the escaped path */ + uri = xmlParseURI((const char *) escURI); + /* If successful, return the escaped string */ + if (uri != NULL) { + xmlFreeURI(uri); + return escURI; + } + xmlFree(escURI); + } + } + +path_processing: +/* For Windows implementations, replace backslashes with 'forward slashes' */ +#if defined(_WIN32) && !defined(__CYGWIN__) + /* + * Create a URI structure + */ + uri = xmlCreateURI(); + if (uri == NULL) { /* Guard against 'out of memory' */ + return(NULL); + } + + len = xmlStrlen(path); + if ((len > 2) && IS_WINDOWS_PATH(path)) { + /* make the scheme 'file' */ + uri->scheme = (char *) xmlStrdup(BAD_CAST "file"); + /* allocate space for leading '/' + path + string terminator */ + uri->path = xmlMallocAtomic(len + 2); + if (uri->path == NULL) { + xmlFreeURI(uri); /* Guard against 'out of memory' */ + return(NULL); + } + /* Put in leading '/' plus path */ + uri->path[0] = '/'; + p = uri->path + 1; + strncpy(p, (char *) path, len + 1); + } else { + uri->path = (char *) xmlStrdup(path); + if (uri->path == NULL) { + xmlFreeURI(uri); + return(NULL); + } + p = uri->path; + } + /* Now change all occurrences of '\' to '/' */ + while (*p != '\0') { + if (*p == '\\') + *p = '/'; + p++; + } + + if (uri->scheme == NULL) { + ret = xmlStrdup((const xmlChar *) uri->path); + } else { + ret = xmlSaveUri(uri); + } + + xmlFreeURI(uri); +#else + ret = xmlStrdup((const xmlChar *) path); +#endif + return(ret); +} + +/** + * xmlPathToURI: + * @path: the resource locator in a filesystem notation + * + * Constructs an URI expressing the existing path + * + * Returns a new URI, or a duplicate of the path parameter if the + * construction fails. The caller is responsible for freeing the memory + * occupied by the returned string. If there is insufficient memory available, + * or the argument is NULL, the function returns NULL. + */ +xmlChar * +xmlPathToURI(const xmlChar *path) +{ + xmlURIPtr uri; + xmlURI temp; + xmlChar *ret, *cal; + + if (path == NULL) + return(NULL); + + if ((uri = xmlParseURI((const char *) path)) != NULL) { + xmlFreeURI(uri); + return xmlStrdup(path); + } + cal = xmlCanonicPath(path); + if (cal == NULL) + return(NULL); +#if defined(_WIN32) && !defined(__CYGWIN__) + /* xmlCanonicPath can return an URI on Windows (is that the intended behaviour?) + If 'cal' is a valid URI already then we are done here, as continuing would make + it invalid. */ + if ((uri = xmlParseURI((const char *) cal)) != NULL) { + xmlFreeURI(uri); + return cal; + } + /* 'cal' can contain a relative path with backslashes. If that is processed + by xmlSaveURI, they will be escaped and the external entity loader machinery + will fail. So convert them to slashes. Misuse 'ret' for walking. */ + ret = cal; + while (*ret != '\0') { + if (*ret == '\\') + *ret = '/'; + ret++; + } +#endif + memset(&temp, 0, sizeof(temp)); + temp.path = (char *) cal; + ret = xmlSaveUri(&temp); + xmlFree(cal); + return(ret); +} +#define bottom_uri +#include "elfgcchack.h" -- cgit v1.2.3