storage/variantToSQLiteT_impl.h
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 301016 d71d5a7a70d2c45f430a119c1b0edcfc8f83f664
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- 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 http://mozilla.org/MPL/2.0/. */

// 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>
int
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;
  aValue->GetDataType(&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);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      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);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      return sqlite3_T_int64(aObj, value);
    }
    case nsIDataType::VTYPE_FLOAT:
    case nsIDataType::VTYPE_DOUBLE:
    {
      double value;
      nsresult rv = aValue->GetAsDouble(&value);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      return sqlite3_T_double(aObj, value);
    }
    case nsIDataType::VTYPE_BOOL:
    {
      bool value;
      nsresult rv = aValue->GetAsBool(&value);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      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);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      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);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);
      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);
      NS_ENSURE_SUCCESS(rv, SQLITE_MISMATCH);

      // 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.
        free(data);
        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:
    default:
      return SQLITE_MISMATCH;
  }
  return SQLITE_OK;
}