Method write_gzip

lib_acl_cpp/src/http/http_client.cpp:209–286

}

bool http_client::write_gzip(ostream& out, const void* data, size_t len)
{
	acl_assert(zstream_);

	if (buf_ == NULL) {
		buf_ = NEW string(4096);
	} else {
		buf_->clear();
	}

	// ��ѹ�����������
	if (data && len > 0) {
		// ���ӷ�ѹ�������ܳ���
		gzip_total_in_ += (unsigned int) len;

		// ���� crc32 �������
		gzip_crc32_ = zstream_->crc32_update(gzip_crc32_, data, len);

		// �Ըö����ݽ���ѹ������
		if (!zstream_->zip_update((const char*) data, (int) len, buf_)) {
			logger_error("zip_update error!");
			return false;
		}

		// ���Ϊ�գ���ֱ�ӷ��أ��ȴ��´ε�д����
		if (buf_->empty()) {
			return true;
		}

		data = buf_->c_str();
		len  = buf_->size();
	}

	// д�� zstream �������������ܻ�������ݣ�ͬʱ����ѹ������
	else {
		// ������ݳ�����Ч
		unsigned total_in = (unsigned) zstream_->get_zstream()->total_in;
		if (total_in != gzip_total_in_) {
			logger_warn("total_in: %d != gzip_total_in_: %d",
				total_in, gzip_total_in_);
		}

		if (!zstream_->zip_finish(buf_)) {
			logger_error("zip_finish error!");
			return false;
		}

		if (buf_->empty()) {
			return true;
		}

		data = buf_->c_str();
		len  = buf_->size();
	}

	// �鴫�䷽ʽ���ѹ������
	if (chunked_transfer_) {
		if (write_chunk(out, data, len)) {