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Robin Getz
d44a953cfa
Change the ft8_crc message length parameter from signed int to uint32_t
since it represents a non-negative FT8 message bit count.
GCC reported a potential buffer overflow in the memcpy() call:
warning: ‘__builtin_memcpy’ specified bound between
18446744073709551560 and 18446744073709551564 exceeds maximum object size
[-Wstringop-overflow=]
The warning was caused by the signed message length allowing negative
values to be converted into a very large unsigned size when calculating
the memcpy() byte count.
Using an unsigned fixed-width type better represents the valid range of
the FT8 message length and prevents invalid negative lengths from being
interpreted as extremely large memory operations.
Signed-off-by: Robin Getz <rgetz503@gmail.com>
44 lines
2.3 KiB
C++
44 lines
2.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// Copyright (C) 2015-2019, 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This is the code from ft8mon: https://github.com/rtmrtmrtmrtm/ft8mon //
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// reformatted and adapted to Qt and SDRangel context //
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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 as version 3 of the License, or //
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// (at your option) any later version. //
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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 V3 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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#ifndef libldpc_h
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#define libldpc_h
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#include <cstdint>
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namespace FT8 {
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class LDPC {
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public:
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static void ldpc_decode(const float llcodeword[], int iters, int plain[], int *ok);
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static void ldpc_decode_log(float codeword[], int iters, int plain[], int *ok);
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static void ft8_crc(int msg1[], uint32_t msglen, int out[14]);
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static void gauss_jordan(int rows, int cols, int m[174][2 * 91], int which[91], int *ok);
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private:
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static int ldpc_check(int codeword[]);
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static float fast_tanh(float x);
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};
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} // namespace FT8
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#endif // libldpc_h
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