1 /*
2 * libjingle
3 * Copyright 2010, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "talk/p2p/base/parsing.h"
29
30 #include <stdlib.h>
31 #include <algorithm>
32 #include "webrtc/base/stringutils.h"
33
34 namespace {
35 static const char kTrue[] = "true";
36 static const char kOne[] = "1";
37 }
38
39 namespace cricket {
40
BadParse(const std::string & text,ParseError * err)41 bool BadParse(const std::string& text, ParseError* err) {
42 if (err != NULL) {
43 err->text = text;
44 }
45 return false;
46 }
47
BadWrite(const std::string & text,WriteError * err)48 bool BadWrite(const std::string& text, WriteError* err) {
49 if (err != NULL) {
50 err->text = text;
51 }
52 return false;
53 }
54
GetXmlAttr(const buzz::XmlElement * elem,const buzz::QName & name,const std::string & def)55 std::string GetXmlAttr(const buzz::XmlElement* elem,
56 const buzz::QName& name,
57 const std::string& def) {
58 std::string val = elem->Attr(name);
59 return val.empty() ? def : val;
60 }
61
GetXmlAttr(const buzz::XmlElement * elem,const buzz::QName & name,const char * def)62 std::string GetXmlAttr(const buzz::XmlElement* elem,
63 const buzz::QName& name,
64 const char* def) {
65 return GetXmlAttr(elem, name, std::string(def));
66 }
67
GetXmlAttr(const buzz::XmlElement * elem,const buzz::QName & name,bool def)68 bool GetXmlAttr(const buzz::XmlElement* elem,
69 const buzz::QName& name, bool def) {
70 std::string val = elem->Attr(name);
71 std::transform(val.begin(), val.end(), val.begin(), tolower);
72
73 return val.empty() ? def : (val == kTrue || val == kOne);
74 }
75
GetXmlAttr(const buzz::XmlElement * elem,const buzz::QName & name,int def)76 int GetXmlAttr(const buzz::XmlElement* elem,
77 const buzz::QName& name, int def) {
78 std::string val = elem->Attr(name);
79 return val.empty() ? def : atoi(val.c_str());
80 }
81
GetXmlChild(const buzz::XmlElement * parent,const std::string & name)82 const buzz::XmlElement* GetXmlChild(const buzz::XmlElement* parent,
83 const std::string& name) {
84 for (const buzz::XmlElement* child = parent->FirstElement();
85 child != NULL;
86 child = child->NextElement()) {
87 if (child->Name().LocalPart() == name) {
88 return child;
89 }
90 }
91 return NULL;
92 }
93
RequireXmlChild(const buzz::XmlElement * parent,const std::string & name,const buzz::XmlElement ** child,ParseError * error)94 bool RequireXmlChild(const buzz::XmlElement* parent,
95 const std::string& name,
96 const buzz::XmlElement** child,
97 ParseError* error) {
98 *child = GetXmlChild(parent, name);
99 if (*child == NULL) {
100 return BadParse("element '" + parent->Name().Merged() +
101 "' missing required child '" + name,
102 error);
103 } else {
104 return true;
105 }
106 }
107
RequireXmlAttr(const buzz::XmlElement * elem,const buzz::QName & name,std::string * value,ParseError * error)108 bool RequireXmlAttr(const buzz::XmlElement* elem,
109 const buzz::QName& name,
110 std::string* value,
111 ParseError* error) {
112 if (!elem->HasAttr(name)) {
113 return BadParse("element '" + elem->Name().Merged() +
114 "' missing required attribute '"
115 + name.Merged() + "'",
116 error);
117 } else {
118 *value = elem->Attr(name);
119 return true;
120 }
121 }
122
AddXmlAttrIfNonEmpty(buzz::XmlElement * elem,const buzz::QName name,const std::string & value)123 void AddXmlAttrIfNonEmpty(buzz::XmlElement* elem,
124 const buzz::QName name,
125 const std::string& value) {
126 if (!value.empty()) {
127 elem->AddAttr(name, value);
128 }
129 }
130
AddXmlChildren(buzz::XmlElement * parent,const std::vector<buzz::XmlElement * > & children)131 void AddXmlChildren(buzz::XmlElement* parent,
132 const std::vector<buzz::XmlElement*>& children) {
133 for (std::vector<buzz::XmlElement*>::const_iterator iter = children.begin();
134 iter != children.end();
135 iter++) {
136 parent->AddElement(*iter);
137 }
138 }
139
CopyXmlChildren(const buzz::XmlElement * source,buzz::XmlElement * dest)140 void CopyXmlChildren(const buzz::XmlElement* source, buzz::XmlElement* dest) {
141 for (const buzz::XmlElement* child = source->FirstElement();
142 child != NULL;
143 child = child->NextElement()) {
144 dest->AddElement(new buzz::XmlElement(*child));
145 }
146 }
147
CopyOfXmlChildren(const buzz::XmlElement * elem)148 std::vector<buzz::XmlElement*> CopyOfXmlChildren(const buzz::XmlElement* elem) {
149 std::vector<buzz::XmlElement*> children;
150 for (const buzz::XmlElement* child = elem->FirstElement();
151 child != NULL;
152 child = child->NextElement()) {
153 children.push_back(new buzz::XmlElement(*child));
154 }
155 return children;
156 }
157
158 } // namespace cricket
159