The Tor Browser: toolkit/mozapps/update/common/readstrings.cpp@6474c204b198 (annotated)

toolkit/mozapps/update/common/readstrings.cpp@6474c204b198 (annotated)

toolkit/mozapps/update/common/readstrings.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et cindent: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <limits.h>
 #include <string.h>
 #include <stdio.h>
 #include "readstrings.h"
 #include "errors.h"
 #ifdef XP_WIN
 # define NS_tfopen _wfopen
 # define OPEN_MODE L"rb"
 #else
 # define NS_tfopen fopen
 # define OPEN_MODE "r"
 #endif
 // stack based FILE wrapper to ensure that fclose is called.
 class AutoFILE {
 public:
   AutoFILE(FILE *fp) : fp_(fp) {}
   ~AutoFILE() { if (fp_) fclose(fp_); }
   operator FILE *() { return fp_; }
 private:
   FILE *fp_;
 };
 class AutoCharArray {
 public:
   AutoCharArray(size_t len) { ptr_ = new char[len]; }
   ~AutoCharArray() { delete[] ptr_; }
   operator char *() { return ptr_; }
 private:
   char *ptr_;
 };
 static const char kNL[] = "\r\n";
 static const char kEquals[] = "=";
 static const char kWhitespace[] = " \t";
 static const char kRBracket[] = "]";
 static const char*
 NS_strspnp(const char *delims, const char *str)
 {
   const char *d;
   do {
     for (d = delims; *d != '\0'; ++d) {
       if (*str == *d) {
         ++str;
         break;
       }
     }
   } while (*d);
   return str;
 }
 static char*
 NS_strtok(const char *delims, char **str)
 {
   if (!*str)
     return nullptr;
   char *ret = (char*) NS_strspnp(delims, *str);
   if (!*ret) {
     *str = ret;
     return nullptr;
   }
   char *i = ret;
   do {
     for (const char *d = delims; *d != '\0'; ++d) {
       if (*i == *d) {
         *i = '\0';
         *str = ++i;
         return ret;
       }
     }
     ++i;
   } while (*i);
   *str = nullptr;
   return ret;
 }
 /**
  * Find a key in a keyList containing zero-delimited keys ending with "\0\0".
  * Returns a zero-based index of the key in the list, or -1 if the key is not found.
  */
 static int
 find_key(const char *keyList, char* key)
 {
   if (!keyList)
     return -1;
   int index = 0;
   const char *p = keyList;
   while (*p)
   {
     if (strcmp(key, p) == 0)
       return index;
     p += strlen(p) + 1;
     index++;
   }
   // The key was not found if we came here
   return -1;
 }
 /**
  * A very basic parser for updater.ini taken mostly from nsINIParser.cpp
  * that can be used by standalone apps.
  *
  * @param path       Path to the .ini file to read
  * @param keyList    List of zero-delimited keys ending with two zero characters
  * @param numStrings Number of strings to read into results buffer - must be equal to the number of keys
  * @param results    Two-dimensional array of strings to be filled in the same order as the keys provided
  * @param section    Optional name of the section to read; defaults to "Strings"
  */
 int
 ReadStrings(const NS_tchar *path,
             const char *keyList,
             unsigned int numStrings,
             char results[][MAX_TEXT_LEN],
             const char *section)
 {
   AutoFILE fp = NS_tfopen(path, OPEN_MODE);
   if (!fp)
     return READ_ERROR;
   /* get file size */
   if (fseek(fp, 0, SEEK_END) != 0)
     return READ_ERROR;
   long len = ftell(fp);
   if (len <= 0)
     return READ_ERROR;
   size_t flen = size_t(len);
   AutoCharArray fileContents(flen + 1);
   if (!fileContents)
     return READ_STRINGS_MEM_ERROR;
   /* read the file in one swoop */
   if (fseek(fp, 0, SEEK_SET) != 0)
     return READ_ERROR;
   size_t rd = fread(fileContents, sizeof(char), flen, fp);
   if (rd != flen)
     return READ_ERROR;
   fileContents[flen] = '\0';
   char *buffer = fileContents;
   bool inStringsSection = false;
   unsigned int read = 0;
   while (char *token = NS_strtok(kNL, &buffer)) {
     if (token[0] == '#' || token[0] == ';') // it's a comment
       continue;
     token = (char*) NS_strspnp(kWhitespace, token);
     if (!*token) // empty line
       continue;
     if (token[0] == '[') { // section header!
       ++token;
       char const * currSection = token;
       char *rb = NS_strtok(kRBracket, &token);
       if (!rb || NS_strtok(kWhitespace, &token)) {
         // there's either an unclosed [Section or a [Section]Moretext!
         // we could frankly decide that this INI file is malformed right
         // here and stop, but we won't... keep going, looking for
         // a well-formed [section] to continue working with
         inStringsSection = false;
       }
       else {
         if (section)
           inStringsSection = strcmp(currSection, section) == 0;
         else
           inStringsSection = strcmp(currSection, "Strings") == 0;
       }
       continue;
     }
     if (!inStringsSection) {
       // If we haven't found a section header (or we found a malformed
       // section header), or this isn't the [Strings] section don't bother
       // parsing this line.
       continue;
     }
     char *key = token;
     char *e = NS_strtok(kEquals, &token);
     if (!e)
       continue;
     int keyIndex = find_key(keyList, key);
     if (keyIndex >= 0 && (unsigned int)keyIndex < numStrings)
     {
       strncpy(results[keyIndex], token, MAX_TEXT_LEN - 1);
       results[keyIndex][MAX_TEXT_LEN - 1] = '\0';
       read++;
     }
   }
   return (read == numStrings) ? OK : PARSE_ERROR;
 }
 // A wrapper function to read strings for the updater.
 // Added for compatibility with the original code.
 int
 ReadStrings(const NS_tchar *path, StringTable *results)
 {
   const unsigned int kNumStrings = 2;
   const char *kUpdaterKeys = "Title\0Info\0";
   char updater_strings[kNumStrings][MAX_TEXT_LEN];
   int result = ReadStrings(path, kUpdaterKeys, kNumStrings, updater_strings);
   strncpy(results->title, updater_strings[0], MAX_TEXT_LEN - 1);
   results->title[MAX_TEXT_LEN - 1] = '\0';
   strncpy(results->info, updater_strings[1], MAX_TEXT_LEN - 1);
   results->info[MAX_TEXT_LEN - 1] = '\0';
   return result;
 }

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toolkit/mozapps/update/common/readstrings.cpp@6474c204b198 (annotated)

toolkit/mozapps/update/common/readstrings.cpp