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Diffstat (limited to 'toolkit/mozapps/update/common/readstrings.cpp')
| -rw-r--r-- | toolkit/mozapps/update/common/readstrings.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/toolkit/mozapps/update/common/readstrings.cpp b/toolkit/mozapps/update/common/readstrings.cpp new file mode 100644 index 000000000..428c91c0b --- /dev/null +++ b/toolkit/mozapps/update/common/readstrings.cpp @@ -0,0 +1,236 @@ +/* -*- 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; +} |