mirror of
https://github.com/scottlamb/moonfire-nvr.git
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77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
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// This file is part of Moonfire NVR, a security camera network video recorder.
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// Copyright (C) 2016 Scott Lamb <slamb@slamb.org>
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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 General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// In addition, as a special exception, the copyright holders give
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// permission to link the code of portions of this program with the
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// OpenSSL library under certain conditions as described in each
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// individual source file, and distribute linked combinations including
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// the two.
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//
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// You must obey the GNU General Public License in all respects for all
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// of the code used other than OpenSSL. If you modify file(s) with this
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// exception, you may extend this exception to your version of the
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// file(s), but you are not obligated to do so. If you do not wish to do
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// so, delete this exception statement from your version. If you delete
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// this exception statement from all source files in the program, then
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// also delete it here.
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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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// coding.cc: see coding.h.
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#include "coding.h"
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namespace moonfire_nvr {
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namespace internal {
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void AppendVar32Slow(uint32_t in, std::string *out) {
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while (true) {
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uint8_t next_byte = in & 0x7F;
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in >>= 7;
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if (in == 0) {
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out->push_back(next_byte);
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return;
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}
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out->push_back(next_byte | 0x80);
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}
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}
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bool DecodeVar32Slow(re2::StringPiece *in, uint32_t *out_p,
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std::string *error_message) {
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auto p = reinterpret_cast<uint8_t const *>(in->data());
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auto end = p + in->size();
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uint32_t out = 0;
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int shift = 0;
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do {
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if (p == end) {
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*error_message = "buffer underrun";
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return false;
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}
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if (shift == 28 && *p & 0xf0) {
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*error_message = "integer overflow";
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return false;
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}
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out |= uint32_t(*p & 0x7f) << shift;
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shift += 7;
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} while ((*p++ & 0x80) != 0);
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*out_p = out;
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in->remove_prefix(reinterpret_cast<char const *>(p) - in->data());
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return true;
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}
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} // namespace internal
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} // namespace moonfire_nvr
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