gecko-dev/xpcom/base/nsINIParser.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

// This file was shamelessly copied from mozilla/xpinstall/wizard/unix/src2

#ifndef nsINIParser_h__
#define nsINIParser_h__

#ifdef MOZILLA_INTERNAL_API
#define nsINIParser nsINIParser_internal
#endif

#include "nscore.h"
#include "nsClassHashtable.h"
#include "mozilla/UniquePtr.h"

#include <stdio.h>

class nsIFile;

class nsINIParser
{
public:
  nsINIParser() {}
  ~nsINIParser() {}

  /**
   * Initialize the INIParser with a nsIFile. If this method fails, no
   * other methods should be called. This method reads and parses the file,
   * the class does not hold a file handle open. An instance must only be
   * initialized once.
   */
  nsresult Init(nsIFile* aFile);

  /**
   * Initialize the INIParser with a file path. If this method fails, no
   * other methods should be called. This method reads and parses the file,
   * the class does not hold a file handle open. An instance must only
   * be initialized once.
   */
  nsresult Init(const char* aPath);

  /**
   * Callback for GetSections
   * @return false to stop enumeration, or true to continue.
   */
  typedef bool (*INISectionCallback)(const char* aSection, void* aClosure);

  /**
   * Enumerate the sections within the INI file.
   */
  nsresult GetSections(INISectionCallback aCB, void* aClosure);

  /**
   * Callback for GetStrings
   * @return false to stop enumeration, or true to continue
   */
  typedef bool (*INIStringCallback)(const char* aString, const char* aValue,
                                    void* aClosure);

  /**
   * Enumerate the strings within a section. If the section does
   * not exist, this function will silently return.
   */
  nsresult GetStrings(const char* aSection,
                      INIStringCallback aCB, void* aClosure);

  /**
   * Get the value of the specified key in the specified section
   * of the INI file represented by this instance.
   *
   * @param aSection      section name
   * @param aKey          key name
   * @param aResult       the value found
   * @throws NS_ERROR_FAILURE if the specified section/key could not be
   *                          found.
   */
  nsresult GetString(const char* aSection, const char* aKey,
                     nsACString& aResult);

  /**
   * Alternate signature of GetString that uses a pre-allocated buffer
   * instead of a nsACString (for use in the standalone glue before
   * the glue is initialized).
   *
   * @throws NS_ERROR_LOSS_OF_SIGNIFICANT_DATA if the aResult buffer is not
   *         large enough for the data. aResult will be filled with as
   *         much data as possible.
   *
   * @see GetString [1]
   */
  nsresult GetString(const char* aSection, const char* aKey,
                     char* aResult, uint32_t aResultLen);

private:
  struct INIValue
  {
    INIValue(const char* aKey, const char* aValue)
      : key(aKey)
      , value(aValue)
    {
    }

    const char* key;
    const char* value;
    mozilla::UniquePtr<INIValue> next;
  };

  nsClassHashtable<nsDepCharHashKey, INIValue> mSections;
  mozilla::UniquePtr<char[]> mFileContents;

  nsresult InitFromFILE(FILE* aFd);
};

#endif /* nsINIParser_h__ */