C++ UCharBuffer类代码示例

// Probably file arrived on the disk
bool notifyDatabaseName(const Firebird::PathName& file)
{
#ifdef HAVE_ID_BY_NAME
	// notifyDatabaseName typically causes changes in aliasesConf()
	// cause it's called only from Config created for missing database.
	// Therefore always take write lock at once.
	WriteLockGuard guard(aliasesConf().rwLock, "notifyDatabaseName");

	DbName* db = aliasesConf().dbHash.lookup(file);
	if (!db)
		return true;
	if (db->id)
		return true;

	UCharBuffer id;
	os_utils::getUniqueFileId(file.c_str(), id);
	if (id.hasData())
	{
		aliasesConf().linkId(db, id);
		return true;
	}
#endif

	return false;
}

void PIO_get_unique_file_id(const Jrd::jrd_file* file, UCharBuffer& id)
{
/**************************************
 *
 *	P I O _ g e t _ u n i q u e _ f i l e _ i d
 *
 **************************************
 *
 * Functional description
 *	Return a binary string that uniquely identifies the file.
 *
 **************************************/
	struct stat statistics;
	if (fstat(file->fil_desc, &statistics) != 0) {
		unix_error("fstat", file, isc_io_access_err);
	}

	const size_t len1 = sizeof(statistics.st_dev);
	const size_t len2 = sizeof(statistics.st_ino);

	UCHAR* p = id.getBuffer(len1 + len2);

	memcpy(p, &statistics.st_dev, len1);
	p += len1;
	memcpy(p, &statistics.st_ino, len2);
}

	string Database::getUniqueFileId() const
	{
		const PageSpace* const pageSpace = dbb_page_manager.findPageSpace(DB_PAGE_SPACE);

		UCharBuffer buffer;
		os_utils::getUniqueFileId(pageSpace->file->fil_desc, buffer);

		string file_id;
		char* s = file_id.getBuffer(2 * buffer.getCount());
		for (FB_SIZE_T i = 0; i < buffer.getCount(); i++)
		{
			sprintf(s, "%02x", (int) buffer[i]);
			s += 2;
		}

		return file_id;
	}

void IntlUtil::getDefaultCollationAttributes(UCharBuffer& collAttributes, charset& cs)
{
	string attributes("ICU-VERSION=");
	attributes += Jrd::UnicodeUtil::getDefaultIcuVersion();
	setupIcuAttributes(&cs, attributes, "", attributes);

	collAttributes.push(reinterpret_cast<const UCHAR*>(attributes.c_str()), attributes.length());
}

// We store in CS_METADATA.
void Jrd::Attachment::storeMetaDataBlob(thread_db* tdbb, jrd_tra* transaction,
	bid* blobId, const string& text, USHORT fromCharSet)
{
	UCharBuffer bpb;
	if (fromCharSet != CS_METADATA)
		BLB_gen_bpb(isc_blob_text, isc_blob_text, fromCharSet, CS_METADATA, bpb);

	blb* blob = blb::create2(tdbb, transaction, blobId, bpb.getCount(), bpb.begin());
	try
	{
		blob->BLB_put_data(tdbb, (const UCHAR*) text.c_str(), text.length());
	}
	catch (const Exception&)
	{
		blob->BLB_close(tdbb);
		throw;
	}

	blob->BLB_close(tdbb);
}

static void makeUniqueFileId(const struct stat& statistics, UCharBuffer& id)
{
	const size_t len1 = sizeof(statistics.st_dev);
	const size_t len2 = sizeof(statistics.st_ino);

	UCHAR* p = id.getBuffer(len1 + len2);

	memcpy(p, &statistics.st_dev, len1);
	p += len1;
	memcpy(p, &statistics.st_ino, len2);
}

void getUniqueFileId(const char* name, UCharBuffer& id)
{
	struct STAT statistics;
	if (os_utils::stat(name, &statistics) != 0)
	{
		id.clear();
		return;
	}

	makeUniqueFileId(statistics, id);
}

void getUniqueFileId(const char* name, UCharBuffer& id)
{
	struct stat statistics;
	while (stat(name, &statistics) != 0)
	{
		if (errno == EINTR)
			continue;

		id.clear();
		return;
	}

	makeUniqueFileId(statistics, id);
}

// Parse routine BLR.
void Routine::parseBlr(thread_db* tdbb, CompilerScratch* csb, bid* blob_id)
{
	Jrd::Attachment* attachment = tdbb->getAttachment();

	UCharBuffer tmp;

	if (blob_id)
	{
		blb* blob = blb::open(tdbb, attachment->getSysTransaction(), blob_id);
		ULONG length = blob->blb_length + 10;
		UCHAR* temp = tmp.getBuffer(length);
		length = blob->BLB_get_data(tdbb, temp, length);
		tmp.resize(length);
	}

	parseMessages(tdbb, csb, BlrReader(tmp.begin(), (unsigned) tmp.getCount()));

	JrdStatement* statement = getStatement();
	PAR_blr(tdbb, NULL, tmp.begin(), (ULONG) tmp.getCount(), NULL, &csb, &statement, false, 0);
	setStatement(statement);

	if (!blob_id)
		setImplemented(false);
}

//.........这里部分代码省略.........
						highest_index = i;
						recycle = true;
						break;
					}
					MergeFile* const mfb = &tail->irsb_mrg_file;
					mfb->mfb_current_block = 0;
					mfb->mfb_equal_records = 0;

					const SLONG record = getRecord(tdbb, i);
					if (record < 0)
						return false;

					sort_rsb->mapData(tdbb, request, getData(tdbb, mfb, record));
				}

				if (recycle)
					break;
			}
		}

		if (!recycle)
			break;
	}

	// finally compute equality group for each stream in sort/merge

	for (FB_SIZE_T i = 0; i < m_args.getCount(); i++)
	{
		const SortedStream* const sort_rsb = m_args[i];
		Impure::irsb_mrg_repeat* const tail = &impure->irsb_mrg_rpt[i];

		MergeFile* const mfb = &tail->irsb_mrg_file;

		UCharBuffer key;
		const ULONG key_length = sort_rsb->getKeyLength();
		UCHAR* const first_data = key.getBuffer(key_length);
		memcpy(first_data, getData(tdbb, mfb, 0), key_length);

		SLONG record;
		while ((record = getRecord(tdbb, i)) >= 0)
		{
			const UCHAR* p = first_data;
			const UCHAR* q = getData(tdbb, mfb, record);

			if (!sort_rsb->compareKeys(p, q))
			{
				tail->irsb_mrg_last_fetched = record;
				break;
			}

			tail->irsb_mrg_equal_end = record;
		}

		if (mfb->mfb_current_block)
		{
			if (!mfb->mfb_space)
			{
				MemoryPool& pool = *getDefaultMemoryPool();
				mfb->mfb_space = FB_NEW_POOL(pool) TempSpace(pool, SCRATCH, false);
			}

			Sort::writeBlock(mfb->mfb_space, mfb->mfb_block_size * mfb->mfb_current_block,
							 mfb->mfb_block_data, mfb->mfb_block_size);
		}
	}

bool IntlUtil::initUnicodeCollation(texttype* tt, charset* cs, const ASCII* name,
	USHORT attributes, const UCharBuffer& specificAttributes, const string& configInfo)
{
	memset(tt, 0, sizeof(*tt));

	// name comes from stack. Copy it.
	ASCII* nameCopy = FB_NEW ASCII[strlen(name) + 1];
	strcpy(nameCopy, name);
	tt->texttype_name = nameCopy;

	tt->texttype_version = TEXTTYPE_VERSION_1;
	tt->texttype_country = CC_INTL;
	tt->texttype_canonical_width = 4;	// UTF-32
	tt->texttype_fn_destroy = unicodeDestroy;
	tt->texttype_fn_compare = unicodeCompare;
	tt->texttype_fn_key_length = unicodeKeyLength;
	tt->texttype_fn_string_to_key = unicodeStrToKey;
	tt->texttype_fn_canonical = unicodeCanonical;

	IntlUtil::SpecificAttributesMap map;

	Jrd::CharSet* charSet = NULL;

	try
	{
		charSet = Jrd::CharSet::createInstance(*getDefaultMemoryPool(), 0, cs);
		IntlUtil::parseSpecificAttributes(charSet, specificAttributes.getCount(),
			specificAttributes.begin(), &map);
		delete charSet;
	}
	catch (...)
	{
		delete charSet;
		gds__log("initUnicodeCollation failed - unexpected exception caught");
		return false;
	}

	IntlUtil::SpecificAttributesMap map16;

	SpecificAttributesMap::Accessor accessor(&map);

	bool found = accessor.getFirst();

	while (found)
	{
		UCharBuffer s1, s2;
		USHORT errCode;
		ULONG errPosition;

		s1.resize(cs->charset_to_unicode.csconvert_fn_convert(
			&cs->charset_to_unicode, accessor.current()->first.length(), NULL, 0, NULL, &errCode, &errPosition));
		s1.resize(cs->charset_to_unicode.csconvert_fn_convert(
			&cs->charset_to_unicode, accessor.current()->first.length(), (UCHAR*) accessor.current()->first.c_str(),
			s1.getCapacity(), s1.begin(), &errCode, &errPosition));

		s2.resize(cs->charset_to_unicode.csconvert_fn_convert(
			&cs->charset_to_unicode, accessor.current()->second.length(), NULL, 0, NULL, &errCode, &errPosition));
		s2.resize(cs->charset_to_unicode.csconvert_fn_convert(
			&cs->charset_to_unicode, accessor.current()->second.length(), (UCHAR*) accessor.current()->second.c_str(),
			s2.getCapacity(), s2.begin(), &errCode, &errPosition));

		map16.put(string((char*) s1.begin(), s1.getCount()), string((char*) s2.begin(), s2.getCount()));

		found = accessor.getNext();
	}

	UnicodeUtil::Utf16Collation* collation =
		UnicodeUtil::Utf16Collation::create(tt, attributes, map16, configInfo);

	if (!collation)
	{
		gds__log("initUnicodeCollation failed - UnicodeUtil::Utf16Collation::create failed");
		return false;
	}

	tt->texttype_impl = FB_NEW TextTypeImpl(cs, collation);

	return true;
}

// Full processing of database name
// Returns true if alias was found in databases.conf
bool expandDatabaseName(Firebird::PathName alias,
						Firebird::PathName& file,
						Firebird::RefPtr<Config>* config)
{
	try
	{
		aliasesConf().checkLoadConfig();
	}
	catch (const fatal_exception& ex)
	{
		gds__log("File databases.conf contains bad data: %s", ex.what());
		Arg::Gds(isc_server_misconfigured).raise();
	}

	// remove whitespaces from database name
	alias.trim();

	ReadLockGuard guard(aliasesConf().rwLock, "expandDatabaseName");

	// First of all check in databases.conf
	if (resolveAlias(alias, file, config))
	{
		return true;
	}

	// Now try ISC_PATH environment variable
	if (!setPath(alias, file))
	{
		// At this step check DatabaseAccess paths in firebird.conf
		if (!resolveDatabaseAccess(alias, file))
		{
			// Last chance - regular filename expansion
			file = alias;

			ISC_systemToUtf8(file);
			ISC_unescape(file);
			ISC_utf8ToSystem(file);

			ISC_expand_filename(file, true);

			ISC_systemToUtf8(file);
			ISC_escape(file);
			ISC_utf8ToSystem(file);
		}
	}

	// Search for correct config in databases.conf
	if (config)
	{
		DbName* db = aliasesConf().dbHash.lookup(file);
#ifdef HAVE_ID_BY_NAME
		if (!db)
		{
			UCharBuffer id;
			os_utils::getUniqueFileId(file.c_str(), id);
			if (id.hasData())
			{
				Id* i = aliasesConf().idHash.lookup(id);
				if (i)
					db = i->db;
			}
		}
#endif
		*config = (db && db->config.hasData()) ? db->config : Config::getDefaultConfig();
	}

	return false;
}