author Tim Huang <>
Tue, 12 Dec 2017 15:25:49 -0600
changeset 398586 9c586454144b4eef9e9a8ab53e3d1a8c3f84ac3c
parent 301015 d71d5a7a70d2c45f430a119c1b0edcfc8f83f664
child 439132 079e9287971001d839030ce8e60bb175018da76c
permissions -rw-r--r--
Bug 1404608 - Reveal the real operating system when fingerprinting resistance is enabled. r=arthuredelstein,smaug This patch makes Firefox not to lie about the real operating system when pref 'privacy.resistFingerprinting' is true. This will also change the testcase as well. MozReview-Commit-ID: Gdnp2lMU3wr

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * 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 */

// Note: we are already in the namepace mozilla::storage

// Note 2: whoever #includes this file must provide implementations of
// sqlite3_T_* prior.

//// variantToSQLiteT Implementation

template <typename T>
variantToSQLiteT(T aObj,
                 nsIVariant *aValue)
  // Allow to return nullptr not wrapped to nsIVariant for speed.
  if (!aValue)
    return sqlite3_T_null(aObj);

  uint16_t valueType;
  switch (valueType) {
    case nsIDataType::VTYPE_INT8:
    case nsIDataType::VTYPE_INT16:
    case nsIDataType::VTYPE_INT32:
    case nsIDataType::VTYPE_UINT8:
    case nsIDataType::VTYPE_UINT16:
      int32_t value;
      nsresult rv = aValue->GetAsInt32(&value);
      return sqlite3_T_int(aObj, value);
    case nsIDataType::VTYPE_UINT32: // Try to preserve full range
    case nsIDataType::VTYPE_INT64:
    // Data loss possible, but there is no unsigned types in SQLite
    case nsIDataType::VTYPE_UINT64:
      int64_t value;
      nsresult rv = aValue->GetAsInt64(&value);
      return sqlite3_T_int64(aObj, value);
    case nsIDataType::VTYPE_FLOAT:
    case nsIDataType::VTYPE_DOUBLE:
      double value;
      nsresult rv = aValue->GetAsDouble(&value);
      return sqlite3_T_double(aObj, value);
    case nsIDataType::VTYPE_BOOL:
      bool value;
      nsresult rv = aValue->GetAsBool(&value);
      return sqlite3_T_int(aObj, value ? 1 : 0);
    case nsIDataType::VTYPE_CHAR:
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
      nsAutoCString value;
      // GetAsAUTF8String should never perform conversion when coming from
      // 8-bit string types, and thus can accept strings with arbitrary encoding
      // (including UTF8 and ASCII).
      nsresult rv = aValue->GetAsAUTF8String(value);
      return sqlite3_T_text(aObj, value);
    case nsIDataType::VTYPE_WCHAR:
    case nsIDataType::VTYPE_DOMSTRING:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
    case nsIDataType::VTYPE_ASTRING:
      nsAutoString value;
      // GetAsAString does proper conversion to UCS2 from all string-like types.
      // It can be used universally without problems (unless someone implements
      // their own variant, but that's their problem).
      nsresult rv = aValue->GetAsAString(value);
      return sqlite3_T_text16(aObj, value);
    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_EMPTY:
    case nsIDataType::VTYPE_EMPTY_ARRAY:
      return sqlite3_T_null(aObj);
    case nsIDataType::VTYPE_ARRAY:
      uint16_t arrayType;
      nsIID iid;
      uint32_t count;
      void *data;
      nsresult rv = aValue->GetAsArray(&arrayType, &iid, &count, &data);

      // Check to make sure it's a supported type.
      NS_ASSERTION(arrayType == nsIDataType::VTYPE_UINT8,
                   "Invalid type passed!  You may leak!");
      if (arrayType != nsIDataType::VTYPE_UINT8) {
        // Technically this could leak with certain data types, but somebody was
        // being stupid passing us this anyway.
        return SQLITE_MISMATCH;

      // Finally do our thing.  The function should free the array accordingly!
      int rc = sqlite3_T_blob(aObj, data, count);
      return rc;
    // Maybe, it'll be possible to convert these
    // in future too.
    case nsIDataType::VTYPE_ID:
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      return SQLITE_MISMATCH;
  return SQLITE_OK;