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Introduce utility class for encoding and refactor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #pragma once | ||
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| #include <string> | ||
| #include "velox/common/base/Status.h" | ||
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| namespace facebook::velox::encoding { | ||
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| /// Padding character used in encoding. | ||
| const static char kPadding = '='; | ||
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| // Checks if there is padding in encoded input. | ||
| static inline bool isPadded(std::string_view input, size_t inputSize) { | ||
| return (inputSize > 0 && input[inputSize - 1] == kPadding); | ||
| } | ||
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| // Counts the number of padding characters in encoded input. | ||
| static inline size_t numPadding(std::string_view input, size_t inputSize) { | ||
| size_t numPadding{0}; | ||
| while (inputSize > 0 && input[inputSize - 1] == kPadding) { | ||
| numPadding++; | ||
| inputSize--; | ||
| } | ||
| return numPadding; | ||
| } | ||
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| // Validate the character in charset with ReverseIndex table | ||
| template <typename Charset, typename ReverseIndex> | ||
| constexpr bool checkForwardIndex( | ||
| uint8_t idx, | ||
| const Charset& charset, | ||
| const ReverseIndex& reverseIndex) { | ||
| return (reverseIndex[static_cast<uint8_t>(charset[idx])] == idx) && | ||
| (idx > 0 ? checkForwardIndex(idx - 1, charset, reverseIndex) : true); | ||
| } | ||
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| // Searches for a character within a charset up to a certain index. | ||
| template <typename Charset> | ||
| constexpr bool findCharacterInCharset( | ||
| const Charset& charset, | ||
| uint8_t index, | ||
| const char character) { | ||
| return index < charset.size() && | ||
| ((charset[index] == character) || | ||
| findCharacterInCharset(charset, index + 1, character)); | ||
| } | ||
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| // Checks the consistency of a reverse index mapping for a given character set. | ||
| template <typename Charset, typename ReverseIndex> | ||
| constexpr bool checkReverseIndex( | ||
| uint8_t index, | ||
| const Charset& charset, | ||
| const ReverseIndex& reverseIndex) { | ||
| return (reverseIndex[index] == 255 | ||
| ? !findCharacterInCharset(charset, 0, static_cast<char>(index)) | ||
| : (charset[reverseIndex[index]] == index)) && | ||
| (index > 0 ? checkReverseIndex(index - 1, charset, reverseIndex) : true); | ||
| } | ||
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| template <typename ReverseIndexType> | ||
| uint8_t reverseLookup( | ||
| char p, | ||
| const ReverseIndexType& reverseIndex, | ||
| Status& status, | ||
| uint8_t kBase) { | ||
| auto curr = reverseIndex[(uint8_t)p]; | ||
| if (curr >= kBase) { | ||
| status = | ||
| Status::UserError("invalid input string: contains invalid characters."); | ||
| return 0; // Return 0 or any other error code indicating failure | ||
| } | ||
| return curr; | ||
| } | ||
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| } // namespace facebook::velox::encoding |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| #include <gtest/gtest.h> | ||
| #include "velox/common/base/tests/GTestUtils.h" | ||
| #include "velox/common/encode/EncoderUtils.h" | ||
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| namespace facebook::velox::encoding { | ||
| class EncoderUtilsTest : public ::testing::Test {}; | ||
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| TEST_F(EncoderUtilsTest, isPadded) { | ||
| EXPECT_TRUE(isPadded("ABC=", 4)); | ||
| EXPECT_FALSE(isPadded("ABC", 3)); | ||
| } | ||
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| TEST_F(EncoderUtilsTest, numPadding) { | ||
| EXPECT_EQ(0, numPadding("ABC", 3)); | ||
| EXPECT_EQ(1, numPadding("ABC=", 4)); | ||
| EXPECT_EQ(2, numPadding("AB==", 4)); | ||
| } | ||
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| } // namespace facebook::velox::encoding |