blob: 77a05d8255a00d6572fa2a1fe886ac357ec064d3 [file] [log] [blame]
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sql/test/test_helpers.h"
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "sql/connection.h"
#include "sql/statement.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
size_t CountSQLItemsOfType(sql::Connection* db, const char* type) {
const char kTypeSQL[] = "SELECT COUNT(*) FROM sqlite_master WHERE type = ?";
sql::Statement s(db->GetUniqueStatement(kTypeSQL));
s.BindCString(0, type);
EXPECT_TRUE(s.Step());
return s.ColumnInt(0);
}
// Get page size for the database.
bool GetPageSize(sql::Connection* db, int* page_size) {
sql::Statement s(db->GetUniqueStatement("PRAGMA page_size"));
if (!s.Step())
return false;
*page_size = s.ColumnInt(0);
return true;
}
// Get |name|'s root page number in the database.
bool GetRootPage(sql::Connection* db, const char* name, int* page_number) {
const char kPageSql[] = "SELECT rootpage FROM sqlite_master WHERE name = ?";
sql::Statement s(db->GetUniqueStatement(kPageSql));
s.BindString(0, name);
if (!s.Step())
return false;
*page_number = s.ColumnInt(0);
return true;
}
// Helper for reading a number from the SQLite header.
// See base/big_endian.h.
unsigned ReadBigEndian(unsigned char* buf, size_t bytes) {
unsigned r = buf[0];
for (size_t i = 1; i < bytes; i++) {
r <<= 8;
r |= buf[i];
}
return r;
}
// Helper for writing a number to the SQLite header.
void WriteBigEndian(unsigned val, unsigned char* buf, size_t bytes) {
for (size_t i = 0; i < bytes; i++) {
buf[bytes - i - 1] = (val & 0xFF);
val >>= 8;
}
}
} // namespace
namespace sql {
namespace test {
bool CorruptSizeInHeader(const base::FilePath& db_path) {
// See http://www.sqlite.org/fileformat.html#database_header
const size_t kHeaderSize = 100;
unsigned char header[kHeaderSize];
base::ScopedFILE file(base::OpenFile(db_path, "rb+"));
if (!file.get())
return false;
if (0 != fseek(file.get(), 0, SEEK_SET))
return false;
if (1u != fread(header, sizeof(header), 1, file.get()))
return false;
int64_t db_size = 0;
if (!base::GetFileSize(db_path, &db_size))
return false;
CorruptSizeInHeaderMemory(header, db_size);
if (0 != fseek(file.get(), 0, SEEK_SET))
return false;
if (1u != fwrite(header, sizeof(header), 1, file.get()))
return false;
return true;
}
void CorruptSizeInHeaderMemory(unsigned char* header, int64_t db_size) {
const size_t kPageSizeOffset = 16;
const size_t kFileChangeCountOffset = 24;
const size_t kPageCountOffset = 28;
const size_t kVersionValidForOffset = 92; // duplicate kFileChangeCountOffset
const unsigned page_size = ReadBigEndian(header + kPageSizeOffset, 2);
// One larger than the expected size.
const unsigned page_count =
static_cast<unsigned>((db_size + page_size) / page_size);
WriteBigEndian(page_count, header + kPageCountOffset, 4);
// Update change count so outstanding readers know the info changed.
// Both spots must match for the page count to be considered valid.
unsigned change_count = ReadBigEndian(header + kFileChangeCountOffset, 4);
WriteBigEndian(change_count + 1, header + kFileChangeCountOffset, 4);
WriteBigEndian(change_count + 1, header + kVersionValidForOffset, 4);
}
bool CorruptTableOrIndex(const base::FilePath& db_path,
const char* tree_name,
const char* update_sql) {
sql::Connection db;
if (!db.Open(db_path))
return false;
int page_size = 0;
if (!GetPageSize(&db, &page_size))
return false;
int page_number = 0;
if (!GetRootPage(&db, tree_name, &page_number))
return false;
// SQLite uses 1-based page numbering.
const long int page_ofs = (page_number - 1) * page_size;
std::unique_ptr<char[]> page_buf(new char[page_size]);
// Get the page into page_buf.
base::ScopedFILE file(base::OpenFile(db_path, "rb+"));
if (!file.get())
return false;
if (0 != fseek(file.get(), page_ofs, SEEK_SET))
return false;
if (1u != fread(page_buf.get(), page_size, 1, file.get()))
return false;
// Require the page to be a leaf node. A multilevel tree would be
// very hard to restore correctly.
if (page_buf[0] != 0xD && page_buf[0] != 0xA)
return false;
// The update has to work, and make changes.
if (!db.Execute(update_sql))
return false;
if (db.GetLastChangeCount() == 0)
return false;
// Ensure that the database is fully flushed.
db.Close();
// Check that the stored page actually changed. This catches usage
// errors where |update_sql| is not related to |tree_name|.
std::unique_ptr<char[]> check_page_buf(new char[page_size]);
// The on-disk data should have changed.
if (0 != fflush(file.get()))
return false;
if (0 != fseek(file.get(), page_ofs, SEEK_SET))
return false;
if (1u != fread(check_page_buf.get(), page_size, 1, file.get()))
return false;
if (!memcmp(check_page_buf.get(), page_buf.get(), page_size))
return false;
// Put the original page back.
if (0 != fseek(file.get(), page_ofs, SEEK_SET))
return false;
if (1u != fwrite(page_buf.get(), page_size, 1, file.get()))
return false;
return true;
}
size_t CountSQLTables(sql::Connection* db) {
return CountSQLItemsOfType(db, "table");
}
size_t CountSQLIndices(sql::Connection* db) {
return CountSQLItemsOfType(db, "index");
}
size_t CountTableColumns(sql::Connection* db, const char* table) {
// TODO(shess): sql::Connection::QuoteForSQL() would make sense.
std::string quoted_table;
{
const char kQuoteSQL[] = "SELECT quote(?)";
sql::Statement s(db->GetUniqueStatement(kQuoteSQL));
s.BindCString(0, table);
EXPECT_TRUE(s.Step());
quoted_table = s.ColumnString(0);
}
std::string sql = "PRAGMA table_info(" + quoted_table + ")";
sql::Statement s(db->GetUniqueStatement(sql.c_str()));
size_t rows = 0;
while (s.Step()) {
++rows;
}
EXPECT_TRUE(s.Succeeded());
return rows;
}
bool CountTableRows(sql::Connection* db, const char* table, size_t* count) {
// TODO(shess): Table should probably be quoted with [] or "". See
// http://www.sqlite.org/lang_keywords.html . Meanwhile, odd names
// will throw an error.
std::string sql = "SELECT COUNT(*) FROM ";
sql += table;
sql::Statement s(db->GetUniqueStatement(sql.c_str()));
if (!s.Step())
return false;
*count = static_cast<size_t>(s.ColumnInt64(0));
return true;
}
bool CreateDatabaseFromSQL(const base::FilePath& db_path,
const base::FilePath& sql_path) {
if (base::PathExists(db_path) || !base::PathExists(sql_path))
return false;
std::string sql;
if (!base::ReadFileToString(sql_path, &sql))
return false;
sql::Connection db;
if (!db.Open(db_path))
return false;
// TODO(shess): Android defaults to auto_vacuum mode.
// Unfortunately, this makes certain kinds of tests which manipulate
// the raw database hard/impossible to write.
// http://crbug.com/307303 is for exploring this test issue.
ignore_result(db.Execute("PRAGMA auto_vacuum = 0"));
return db.Execute(sql.c_str());
}
std::string IntegrityCheck(sql::Connection* db) {
sql::Statement statement(db->GetUniqueStatement("PRAGMA integrity_check"));
// SQLite should always return a row of data.
EXPECT_TRUE(statement.Step());
return statement.ColumnString(0);
}
} // namespace test
} // namespace sql