Paul Cercueil
XML C parser available under the MIT license. http://xmlsoft.org/
Diff: uri.c
- Revision:
- 0:03b5121a232e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/uri.c Thu Aug 25 10:05:35 2016 +0000
@@ -0,0 +1,2567 @@
+/**
+ * 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 <string.h>
+
+#include <libxml/xmlmemory.h>
+#include <libxml/uri.h>
+#include <libxml/globals.h>
+#include <libxml/xmlerror.h>
+
+/**
+ * MAX_URI_LENGTH:
+ *
+ * The definition of the URI regexp in the above RFC has no size limit
+ * In practice they are usually relativey 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;
+
+ if (ISA_DIGIT(cur)) {
+ if (uri != NULL)
+ uri->port = 0;
+ while (ISA_DIGIT(cur)) {
+ if (uri != NULL)
+ uri->port = uri->port * 10 + (*cur - '0');
+ cur++;
+ }
+ *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 adressing 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];
+ }
+ /* nomalize // */
+ 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 "<segment>/../", where <segment> 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 "<segment>/..", where <segment>
+ * is a complete path segment not equal to "..", that
+ * "<segment>/.." 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) {
+ 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) {
+ 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 wierd 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 pos = 0;
+ 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)
+ */
+ if (bas->path == NULL) {
+ if (ref->path != NULL) {
+ uptr = (xmlChar *) ref->path;
+ if (*uptr == '/')
+ uptr++;
+ /* exception characters from xmlSaveUri */
+ val = xmlURIEscapeStr(uptr, BAD_CAST "/;&=+$,");
+ }
+ goto done;
+ }
+ bptr = (xmlChar *)bas->path;
+ if (ref->path == NULL) {
+ for (ix = 0; bptr[ix] != 0; ix++) {
+ if (bptr[ix] == '/')
+ nbslash++;
+ }
+ uptr = NULL;
+ len = 1; /* this is for a string terminator only */
+ } else {
+ /*
+ * Next we compare the two strings and find where they first differ
+ */
+ if ((ref->path[pos] == '.') && (ref->path[pos+1] == '/'))
+ pos += 2;
+ if ((*bptr == '.') && (bptr[1] == '/'))
+ bptr += 2;
+ else if ((*bptr == '/') && (ref->path[pos] != '/'))
+ bptr++;
+ while ((bptr[pos] == ref->path[pos]) && (bptr[pos] != 0))
+ pos++;
+
+ if (bptr[pos] == ref->path[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;
+ if ((ref->path[ix] == '/') && (ix > 0))
+ ix--;
+ else if ((ref->path[ix] == 0) && (ix > 1) && (ref->path[ix - 1] == '/'))
+ ix -= 2;
+ for (; ix > 0; ix--) {
+ if (ref->path[ix] == '/')
+ break;
+ }
+ if (ix == 0) {
+ uptr = (xmlChar *)ref->path;
+ } else {
+ ix++;
+ uptr = (xmlChar *)&ref->path[ix];
+ }
+
+ /*
+ * In base, count the number of '/' from the differing point
+ */
+ if (bptr[pos] != ref->path[pos]) {/* check for trivial URI == base */
+ for (; bptr[ix] != 0; ix++) {
+ if (bptr[ix] == '/')
+ nbslash++;
+ }
+ }
+ 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;
+ int i = 0;
+ xmlChar *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;
+ }
+ }
+ }
+
+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 = xmlStrdup(BAD_CAST "file");
+ /* allocate space for leading '/' + path + string terminator */
+ uri->path = xmlMallocAtomic(len + 2);
+ if (uri->path == NULL) {
+ xmlFreeURI(uri); /* Guard agains 'out of memory' */
+ return(NULL);
+ }
+ /* Put in leading '/' plus path */
+ uri->path[0] = '/';
+ p = uri->path + 1;
+ strncpy(p, path, len + 1);
+ } else {
+ uri->path = xmlStrdup(path);
+ if (uri->path == NULL) {
+ xmlFreeURI(uri);
+ return(NULL);
+ }
+ p = uri->path;
+ }
+ /* Now change all occurences 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 allready 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"
+