mirror of
https://github.com/OpenVPN/openvpn3.git
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dde1574596
This is the result after running 'clang-format -i' on all C++ files and headers, with the defined formatting rules in .clang-format. Only the openvpn/common/unicode-impl.hpp has been excluded, as that is mostly a copy of an external project. Signed-off-by: David Sommerseth <davids@openvpn.net>
189 lines
5.4 KiB
C++
189 lines
5.4 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/hexstr.hpp>
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#include <openvpn/buffer/buffer.hpp>
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#include <openvpn/frame/frame.hpp>
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namespace openvpn {
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namespace WS {
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class ChunkedHelper
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{
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enum State
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{
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hex,
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post_hex,
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post_hex_lf,
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post_chunk_cr,
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post_chunk_lf,
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post_content_cr,
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post_content_lf,
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done,
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chunk,
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};
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public:
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ChunkedHelper()
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: state(hex),
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size(0)
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{
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}
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template <typename PARENT>
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bool receive(PARENT &callback, BufferAllocated &buf)
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{
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while (buf.defined())
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{
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if (state == chunk)
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{
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if (size)
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{
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if (buf.size() <= size)
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{
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size -= buf.size();
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callback.chunked_content_in(buf);
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break;
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}
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else
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{
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BufferAllocated content(buf.read_alloc(size), size, 0);
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size = 0;
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callback.chunked_content_in(content);
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}
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}
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else
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state = post_chunk_cr;
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}
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else if (state == done)
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break;
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else
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{
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const char c = char(buf.pop_front());
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reprocess:
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switch (state)
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{
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case hex:
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{
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const int v = parse_hex_char(c);
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if (v >= 0)
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size = (size << 4) + v;
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else
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{
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state = post_hex;
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goto reprocess;
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}
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}
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break;
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case post_hex:
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if (c == '\r')
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state = post_hex_lf;
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break;
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case post_hex_lf:
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if (c == '\n')
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{
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if (size)
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state = chunk;
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else
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state = post_content_cr;
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}
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else
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{
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state = post_hex;
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goto reprocess;
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}
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break;
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case post_chunk_cr:
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if (c == '\r')
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state = post_chunk_lf;
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break;
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case post_chunk_lf:
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if (c == '\n')
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state = hex;
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else
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{
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state = post_chunk_cr;
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goto reprocess;
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}
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break;
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case post_content_cr:
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if (c == '\r')
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state = post_content_lf;
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break;
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case post_content_lf:
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if (c == '\n')
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state = done;
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else
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{
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state = post_content_cr;
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goto reprocess;
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}
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break;
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default: // should never be reached
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break;
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}
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}
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}
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return state == done;
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}
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static BufferPtr transmit(BufferPtr buf)
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{
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const size_t headroom = 24;
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const size_t tailroom = 16;
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static const char crlf[] = "\r\n";
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if (!buf || buf->offset() < headroom || buf->remaining() < tailroom)
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{
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// insufficient headroom/tailroom, must realloc
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Frame::Context fc(headroom, 0, tailroom, 0, sizeof(size_t), 0);
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buf = fc.copy(buf);
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}
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size_t size = buf->size();
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buf->prepend((unsigned char *)crlf, 2);
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if (size)
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{
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while (size)
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{
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char *pc = (char *)buf->prepend_alloc(1);
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*pc = render_hex_char(size & 0xF);
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size >>= 4;
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}
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}
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else
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{
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char *pc = (char *)buf->prepend_alloc(1);
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*pc = '0';
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}
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buf->write((unsigned char *)crlf, 2);
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return buf;
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}
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private:
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State state;
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size_t size;
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};
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} // namespace WS
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} // namespace openvpn
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