97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <comphelper/xmltools.hxx>
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#include <rtl/random.h>
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#include <vector>
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using namespace com::sun::star;
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namespace
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{
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//Will be inside an xml comment, so can't use '-' in case '--' appears in
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//output, etc. Despite what *is* legal in an xml comment, just using the
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//base-64 subset to avoid pain with simplistic third-party parsers
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static const sal_uInt8 aChaffEncoder[] =
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{
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'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
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'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
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'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
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'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
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'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
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'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
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'M', 'c', 's', '8', 'N', 'd', 't', '9',
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'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
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'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
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'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
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'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
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'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
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'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
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'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
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'M', 'c', 's', '8', 'N', 'd', 't', '9',
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'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
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'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
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'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
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'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
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'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
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'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
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'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
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'M', 'c', 's', '8', 'N', 'd', 't', '9',
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'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
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'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
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'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
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'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
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'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
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'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
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'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
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'M', 'c', 's', '8', 'N', 'd', 't', '9',
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'O', 'e', 'u', '+', 'P', 'f', 'v', '/'
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};
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void encodeChaff(std::vector<sal_uInt8> &rChaff)
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{
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static_assert(sizeof(aChaffEncoder) == 256, "this has to cover all chars");
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for (std::vector<sal_uInt8>::iterator aI = rChaff.begin(), aEnd = rChaff.end();
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aI != aEnd; ++aI)
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{
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*aI = aChaffEncoder[*aI];
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}
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}
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}
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namespace comphelper
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{
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namespace xml
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{
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OString makeXMLChaff()
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{
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rtlRandomPool pool = rtl_random_createPool();
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sal_Int8 n;
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rtl_random_getBytes(pool, &n, 1);
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sal_Int32 nLength = 1024+n;
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// coverity[tainted_data] - 1024 deliberate random minus max -127/plus max 128
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std::vector<sal_uInt8> aChaff(nLength);
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rtl_random_getBytes(pool, &aChaff[0], nLength);
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rtl_random_destroyPool(pool);
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encodeChaff(aChaff);
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return OString(reinterpret_cast<const sal_Char*>(&aChaff[0]), nLength);
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}
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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