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      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 <algorithm>
     31 #include <stdlib.h>
     32 #include "talk/base/stringutils.h"
     33 
     34 namespace {
     35 std::string kTrue = "true";
     36 std::string kOne = "1";
     37 }
     38 
     39 namespace cricket {
     40 
     41 bool BadParse(const std::string& text, ParseError* err) {
     42   if (err != NULL) {
     43     err->text = text;
     44   }
     45   return false;
     46 }
     47 
     48 bool BadWrite(const std::string& text, WriteError* err) {
     49   if (err != NULL) {
     50     err->text = text;
     51   }
     52   return false;
     53 }
     54 
     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 
     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 
     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 
     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 
     82 void AddXmlAttr(buzz::XmlElement* elem,
     83                 const buzz::QName& name, int n) {
     84   char buf[32];
     85   talk_base::sprintfn(buf, sizeof(buf), "%d", n);
     86   elem->AddAttr(name, buf);
     87 }
     88 
     89 void SetXmlBody(buzz::XmlElement* elem, uint32 u) {
     90   char buf[16];
     91   talk_base::sprintfn(buf, sizeof(buf), "%u", u);
     92   elem->SetBodyText(buf);
     93 }
     94 
     95 const buzz::XmlElement* GetXmlChild(const buzz::XmlElement* parent,
     96                                     const std::string& name) {
     97   for (const buzz::XmlElement* child = parent->FirstElement();
     98        child != NULL;
     99        child = child->NextElement()) {
    100     if (child->Name().LocalPart() == name) {
    101       return child;
    102     }
    103   }
    104   return NULL;
    105 }
    106 
    107 bool RequireXmlChild(const buzz::XmlElement* parent,
    108                      const std::string& name,
    109                      const buzz::XmlElement** child,
    110                      ParseError* error) {
    111   *child = GetXmlChild(parent, name);
    112   if (*child == NULL) {
    113     return BadParse("element '" + parent->Name().Merged() +
    114                     "' missing required child '" + name,
    115                     error);
    116   } else {
    117     return true;
    118   }
    119 }
    120 
    121 bool RequireXmlAttr(const buzz::XmlElement* elem,
    122                     const buzz::QName& name,
    123                     std::string* value,
    124                     ParseError* error) {
    125   if (!elem->HasAttr(name)) {
    126     return BadParse("element '" + elem->Name().Merged() +
    127                     "' missing required attribute '"
    128                     + name.Merged() + "'",
    129                     error);
    130   } else {
    131     *value = elem->Attr(name);
    132     return true;
    133   }
    134 }
    135 
    136 void AddXmlChildren(buzz::XmlElement* parent,
    137                     const std::vector<buzz::XmlElement*>& children) {
    138   for (std::vector<buzz::XmlElement*>::const_iterator iter = children.begin();
    139        iter != children.end();
    140        iter++) {
    141     parent->AddElement(*iter);
    142   }
    143 }
    144 
    145 void CopyXmlChildren(const buzz::XmlElement* source, buzz::XmlElement* dest) {
    146   for (const buzz::XmlElement* child = source->FirstElement();
    147        child != NULL;
    148        child = child->NextElement()) {
    149     dest->AddElement(new buzz::XmlElement(*child));
    150   }
    151 }
    152 
    153 std::vector<buzz::XmlElement*> CopyOfXmlChildren(const buzz::XmlElement* elem) {
    154   std::vector<buzz::XmlElement*> children;
    155   for (const buzz::XmlElement* child = elem->FirstElement();
    156        child != NULL;
    157        child = child->NextElement()) {
    158     children.push_back(new buzz::XmlElement(*child));
    159   }
    160   return children;
    161 }
    162 
    163 }  // namespace cricket
    164