summaryrefslogtreecommitdiffstats
path: root/toolkit/mozapps/update/common/readstrings.cpp
blob: 428c91c0ba69e2030f2dd0b5dbcc19e1f3dda61f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/* -*- 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:
  explicit AutoFILE(FILE *fp) : fp_(fp) {}
  ~AutoFILE() { if (fp_) fclose(fp_); }
  operator FILE *() { return fp_; }
private:
  FILE *fp_;
};

class AutoCharArray {
public:
  explicit 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;
}