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https://github.com/wpilibsuite/allwpilib
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Prepare wpiutil for merge into allwpilib.
This commit is contained in:
Peter Johnson
171
wpiutil/src/main/native/cpp/support/Base64.cpp
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171
wpiutil/src/main/native/cpp/support/Base64.cpp
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/* ====================================================================
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* Copyright (c) 1995-1999 The Apache Group. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the Apache Group
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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*
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* 4. The names "Apache Server" and "Apache Group" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the Apache Group
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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*
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* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Group and was originally based
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* on public domain software written at the National Center for
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* Supercomputing Applications, University of Illinois, Urbana-Champaign.
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* For more information on the Apache Group and the Apache HTTP server
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* project, please see <http://www.apache.org/>.
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*
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*/
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#include "support/Base64.h"
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#include "llvm/SmallVector.h"
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#include "llvm/raw_ostream.h"
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namespace wpi {
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// aaaack but it's fast and const should make it shared text page.
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static const unsigned char pr2six[256] = {
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// ASCII table
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 62, 64, 64, 64, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60,
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61, 64, 64, 64, 64, 64, 64, 64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
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11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64,
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64, 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
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43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64};
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size_t Base64Decode(llvm::raw_ostream& os, llvm::StringRef encoded) {
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const unsigned char* end = encoded.bytes_begin();
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while (pr2six[*end] <= 63 && end != encoded.bytes_end()) ++end;
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size_t nprbytes = end - encoded.bytes_begin();
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if (nprbytes == 0) return 0;
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const unsigned char* cur = encoded.bytes_begin();
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while (nprbytes > 4) {
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os << static_cast<unsigned char>(pr2six[cur[0]] << 2 | pr2six[cur[1]] >> 4);
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os << static_cast<unsigned char>(pr2six[cur[1]] << 4 | pr2six[cur[2]] >> 2);
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os << static_cast<unsigned char>(pr2six[cur[2]] << 6 | pr2six[cur[3]]);
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cur += 4;
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nprbytes -= 4;
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}
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// Note: (nprbytes == 1) would be an error, so just ignore that case
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if (nprbytes > 1)
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os << static_cast<unsigned char>(pr2six[cur[0]] << 2 | pr2six[cur[1]] >> 4);
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if (nprbytes > 2)
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os << static_cast<unsigned char>(pr2six[cur[1]] << 4 | pr2six[cur[2]] >> 2);
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if (nprbytes > 3)
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os << static_cast<unsigned char>(pr2six[cur[2]] << 6 | pr2six[cur[3]]);
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return (end - encoded.bytes_begin()) + ((4 - nprbytes) & 3);
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}
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size_t Base64Decode(llvm::StringRef encoded, std::string* plain) {
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plain->resize(0);
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llvm::raw_string_ostream os(*plain);
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size_t rv = Base64Decode(os, encoded);
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os.flush();
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return rv;
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}
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llvm::StringRef Base64Decode(llvm::StringRef encoded, size_t* num_read,
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llvm::SmallVectorImpl<char>& buf) {
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buf.clear();
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llvm::raw_svector_ostream os(buf);
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*num_read = Base64Decode(os, encoded);
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return os.str();
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}
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static const char basis_64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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void Base64Encode(llvm::raw_ostream& os, llvm::StringRef plain) {
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if (plain.empty()) return;
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size_t len = plain.size();
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size_t i;
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for (i = 0; (i + 2) < len; i += 3) {
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os << basis_64[(plain[i] >> 2) & 0x3F];
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os << basis_64[((plain[i] & 0x3) << 4) |
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(static_cast<int>(plain[i + 1] & 0xF0) >> 4)];
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os << basis_64[((plain[i + 1] & 0xF) << 2) |
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(static_cast<int>(plain[i + 2] & 0xC0) >> 6)];
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os << basis_64[plain[i + 2] & 0x3F];
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}
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if (i < len) {
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os << basis_64[(plain[i] >> 2) & 0x3F];
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if (i == (len - 1)) {
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os << basis_64[((plain[i] & 0x3) << 4)];
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os << '=';
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} else {
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os << basis_64[((plain[i] & 0x3) << 4) |
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(static_cast<int>(plain[i + 1] & 0xF0) >> 4)];
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os << basis_64[((plain[i + 1] & 0xF) << 2)];
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}
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os << '=';
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}
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}
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void Base64Encode(llvm::StringRef plain, std::string* encoded) {
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encoded->resize(0);
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llvm::raw_string_ostream os(*encoded);
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Base64Encode(os, plain);
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os.flush();
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}
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llvm::StringRef Base64Encode(llvm::StringRef plain,
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llvm::SmallVectorImpl<char>& buf) {
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buf.clear();
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llvm::raw_svector_ostream os(buf);
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Base64Encode(os, plain);
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return os.str();
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}
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} // namespace wpi
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