From 5c0d79d4628567bf8f0285ec29847f0abd13efce Mon Sep 17 00:00:00 2001 From: Joe Abraham Date: Thu, 1 Feb 2024 11:42:44 +0530 Subject: [PATCH] Add presto scalar function 'from_base32' --- velox/common/encode/Base32.cpp | 191 ++++++++++++++++++ velox/common/encode/Base32.h | 50 +++++ velox/common/encode/CMakeLists.txt | 2 +- velox/common/encode/tests/Base32Test.cpp | 61 ++++++ velox/common/encode/tests/CMakeLists.txt | 2 +- velox/docs/functions/presto/binary.rst | 4 + velox/functions/prestosql/BinaryFunctions.h | 20 ++ .../BinaryFunctionsRegistration.cpp | 2 + .../prestosql/tests/BinaryFunctionsTest.cpp | 36 ++++ 9 files changed, 366 insertions(+), 2 deletions(-) create mode 100644 velox/common/encode/Base32.cpp create mode 100644 velox/common/encode/Base32.h create mode 100644 velox/common/encode/tests/Base32Test.cpp diff --git a/velox/common/encode/Base32.cpp b/velox/common/encode/Base32.cpp new file mode 100644 index 0000000000000..dea8946323e7b --- /dev/null +++ b/velox/common/encode/Base32.cpp @@ -0,0 +1,191 @@ +/* + * 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. + */ +#include "velox/common/encode/Base32.h" + +#include + +namespace facebook::velox::encoding { + +// Encoding base to be used. +constexpr static int kBase = 32; + +// Constants defining the size in bytes of binary and encoded blocks for Base32 +// encoding. +// Size of a binary block in bytes (5 bytes = 40 bits) +constexpr static int kBinaryBlockByteSize = 5; +// Size of an encoded block in bytes (8 bytes = 40 bits) +constexpr static int kEncodedBlockByteSize = 8; + +constexpr Charset kBase32Charset = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', + 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', + 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', + 'Y', 'Z', '2', '3', '4', '5', '6', '7'}; + +constexpr ReverseIndex kBase32ReverseIndexTable = { + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, + 25, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255}; + +/// Verify that for each 32 entries in kBase32Charset, the corresponding entry +/// in kBase32ReverseIndexTable is correct. +static_assert( + checkForwardIndex( + sizeof(kBase32Charset) / 2 - 1, + kBase32Charset, + kBase32ReverseIndexTable), + "kBase32Charset has incorrect entries"); + +/// Verify that for every entry in kBase32ReverseIndexTable, the corresponding +/// entry in kBase32Charset is correct. +static_assert( + checkReverseIndex( + sizeof(kBase32ReverseIndexTable) - 1, + kBase32Charset, + kBase, + kBase32ReverseIndexTable), + "kBase32ReverseIndexTable has incorrect entries."); + +size_t Base32::calculateDecodedSize(const char* data, size_t& size) { + if (size == 0) { + return 0; + } + + // Check if the input data is padded + if (isPadded(data, size)) { + /// If padded, ensure that the string length is a multiple of the encoded + /// block size. + if (size % kEncodedBlockByteSize != 0) { + throw EncoderException( + "Base32::decode() - invalid input string: " + "string length is not a multiple of 8."); + } + + auto needed = (size * kBinaryBlockByteSize) / kEncodedBlockByteSize; + auto padding = countPadding(data, size); + size -= padding; + + // Adjust the needed size by deducting the bytes corresponding to the + // padding from the calculated size. + return needed - + ((padding * kBinaryBlockByteSize) + (kEncodedBlockByteSize - 1)) / + kEncodedBlockByteSize; + } else { + // If not padded, calculate extra bytes, if any. + auto extra = size % kEncodedBlockByteSize; + auto needed = (size / kEncodedBlockByteSize) * kBinaryBlockByteSize; + + // Adjust the needed size for extra bytes, if present. + if (extra) { + if ((extra == 6) || (extra == 3) || (extra == 1)) { + throw EncoderException( + "Base32::decode() - invalid input string: " + "string length cannot be 6, 3 or 1 more than a multiple of 8."); + } + needed += (extra * kBinaryBlockByteSize) / kEncodedBlockByteSize; + } + + return needed; + } +} + +size_t +Base32::decode(const char* src, size_t src_len, char* dst, size_t dst_len) { + return decodeImpl(src, src_len, dst, dst_len, kBase32ReverseIndexTable); +} + +size_t Base32::decodeImpl( + const char* src, + size_t src_len, + char* dst, + size_t dst_len, + const ReverseIndex& reverse_lookup) { + if (!src_len) { + return 0; + } + + auto needed = calculateDecodedSize(src, src_len); + if (dst_len < needed) { + throw EncoderException( + "Base32::decode() - invalid output string: " + "output string is too small."); + } + + // Handle full groups of 8 characters. + for (; src_len > 8; src_len -= 8, src += 8, dst += 5) { + /// Each character of the 8 bytes encode 5 bits of the original, grab each + /// with the appropriate shifts to rebuild the original and then split that + /// back into the original 8 bit bytes. + uint64_t last = + (uint64_t(baseReverseLookup(kBase, src[0], reverse_lookup)) << 35) | + (uint64_t(baseReverseLookup(kBase, src[1], reverse_lookup)) << 30) | + (baseReverseLookup(kBase, src[2], reverse_lookup) << 25) | + (baseReverseLookup(kBase, src[3], reverse_lookup) << 20) | + (baseReverseLookup(kBase, src[4], reverse_lookup) << 15) | + (baseReverseLookup(kBase, src[5], reverse_lookup) << 10) | + (baseReverseLookup(kBase, src[6], reverse_lookup) << 5) | + baseReverseLookup(kBase, src[7], reverse_lookup); + dst[0] = (last >> 32) & 0xff; + dst[1] = (last >> 24) & 0xff; + dst[2] = (last >> 16) & 0xff; + dst[3] = (last >> 8) & 0xff; + dst[4] = last & 0xff; + } + + /// Handle the last 2, 4, 5, 7 or 8 characters. This is similar to the above, + /// but the last characters may or may not exist. + DCHECK(src_len >= 2); + uint64_t last = + (uint64_t(baseReverseLookup(kBase, src[0], reverse_lookup)) << 35) | + (uint64_t(baseReverseLookup(kBase, src[1], reverse_lookup)) << 30); + dst[0] = (last >> 32) & 0xff; + if (src_len > 2) { + last |= baseReverseLookup(kBase, src[2], reverse_lookup) << 25; + last |= baseReverseLookup(kBase, src[3], reverse_lookup) << 20; + dst[1] = (last >> 24) & 0xff; + if (src_len > 4) { + last |= baseReverseLookup(kBase, src[4], reverse_lookup) << 15; + dst[2] = (last >> 16) & 0xff; + if (src_len > 5) { + last |= baseReverseLookup(kBase, src[5], reverse_lookup) << 10; + last |= baseReverseLookup(kBase, src[6], reverse_lookup) << 5; + dst[3] = (last >> 8) & 0xff; + if (src_len > 7) { + last |= baseReverseLookup(kBase, src[7], reverse_lookup); + dst[4] = last & 0xff; + } + } + } + } + + return needed; +} + +} // namespace facebook::velox::encoding diff --git a/velox/common/encode/Base32.h b/velox/common/encode/Base32.h new file mode 100644 index 0000000000000..bf978a5367017 --- /dev/null +++ b/velox/common/encode/Base32.h @@ -0,0 +1,50 @@ +/* + * 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 + +#include +#include +#include + +#include +#include "velox/common/encode/EncoderUtils.h" + +namespace facebook::velox::encoding { + +class Base32 { + public: + /// Returns decoded size for the specified input. Adjusts the 'size' to + /// subtract the length of the padding, if exists. + static size_t calculateDecodedSize(const char* data, size_t& size); + + /// Decodes the specified number of characters from the 'src' and writes the + /// result to the 'dst'. The destination must have enough space, e.g. as + /// returned by the calculateDecodedSize(). + static size_t + decode(const char* src, size_t src_len, char* dst, size_t dst_len); + + private: + /// Decodes the specified number of base 32 encoded characters from the 'src' + /// and writes to 'dst' + static size_t decodeImpl( + const char* src, + size_t src_len, + char* dst, + size_t dst_len, + const ReverseIndex& table); +}; + +} // namespace facebook::velox::encoding diff --git a/velox/common/encode/CMakeLists.txt b/velox/common/encode/CMakeLists.txt index bc27527e14ace..9709df2486807 100644 --- a/velox/common/encode/CMakeLists.txt +++ b/velox/common/encode/CMakeLists.txt @@ -16,5 +16,5 @@ if(${VELOX_BUILD_TESTING}) add_subdirectory(tests) endif() -add_library(velox_encode Base64.cpp) +add_library(velox_encode Base32.cpp Base64.cpp) target_link_libraries(velox_encode PUBLIC Folly::folly) diff --git a/velox/common/encode/tests/Base32Test.cpp b/velox/common/encode/tests/Base32Test.cpp new file mode 100644 index 0000000000000..25371c07b18e7 --- /dev/null +++ b/velox/common/encode/tests/Base32Test.cpp @@ -0,0 +1,61 @@ +/* + * 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. + */ + +#include "velox/common/encode/Base32.h" +#include +#include "velox/common/base/tests/GTestUtils.h" + +namespace facebook::velox::encoding { + +class Base32Test : public ::testing::Test {}; + +TEST_F(Base32Test, calculateDecodedSizeProperSize) { + size_t encoded_size{0}; + + encoded_size = 8; + EXPECT_EQ(1, Base32::calculateDecodedSize("ME======", encoded_size)); + EXPECT_EQ(2, encoded_size); + + encoded_size = 2; + EXPECT_EQ(1, Base32::calculateDecodedSize("ME", encoded_size)); + EXPECT_EQ(2, encoded_size); + + encoded_size = 9; + EXPECT_THROW( + Base32::calculateDecodedSize("MFRA====", encoded_size), + facebook::velox::encoding::EncoderException); + + encoded_size = 8; + EXPECT_EQ(2, Base32::calculateDecodedSize("MFRA====", encoded_size)); + EXPECT_EQ(4, encoded_size); + + encoded_size = 8; + EXPECT_EQ(3, Base32::calculateDecodedSize("MFRGG===", encoded_size)); + EXPECT_EQ(5, encoded_size); + + encoded_size = 24; + EXPECT_EQ( + 11, + Base32::calculateDecodedSize("NBSWY3DPEB3W64TMMQ======", encoded_size)); + EXPECT_EQ(18, encoded_size); + + encoded_size = 18; + EXPECT_EQ( + 11, Base32::calculateDecodedSize("NBSWY3DPEB3W64TMMQ", encoded_size)); + EXPECT_EQ(18, encoded_size); +} + +} // namespace facebook::velox::encoding \ No newline at end of file diff --git a/velox/common/encode/tests/CMakeLists.txt b/velox/common/encode/tests/CMakeLists.txt index 548ce580e4691..ca9d489f6e501 100644 --- a/velox/common/encode/tests/CMakeLists.txt +++ b/velox/common/encode/tests/CMakeLists.txt @@ -12,7 +12,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -add_executable(velox_common_encode_test Base64Test.cpp EncoderUtilsTests.cpp) +add_executable(velox_common_encode_test Base32Test.cpp Base64Test.cpp EncoderUtilsTests.cpp) add_test(velox_common_encode_test velox_common_encode_test) target_link_libraries( velox_common_encode_test diff --git a/velox/docs/functions/presto/binary.rst b/velox/docs/functions/presto/binary.rst index 52cf9969f0a3c..953ee04e68ecc 100644 --- a/velox/docs/functions/presto/binary.rst +++ b/velox/docs/functions/presto/binary.rst @@ -41,6 +41,10 @@ Binary Functions Decodes ``bigint`` value from a 64-bit 2’s complement big endian ``binary``. +.. function:: from_base32(string) -> varbinary + + Decodes binary data from the base32 encoded ``string``. + .. function:: from_hex(string) -> varbinary Decodes binary data from the hex encoded ``string``. diff --git a/velox/functions/prestosql/BinaryFunctions.h b/velox/functions/prestosql/BinaryFunctions.h index 94180fe2ab3be..a597a499de279 100644 --- a/velox/functions/prestosql/BinaryFunctions.h +++ b/velox/functions/prestosql/BinaryFunctions.h @@ -21,6 +21,7 @@ #include "folly/ssl/OpenSSLHash.h" #include "velox/common/base/BitUtil.h" +#include "velox/common/encode/Base32.h" #include "velox/common/encode/Base64.h" #include "velox/external/md5/md5.h" #include "velox/functions/Udf.h" @@ -325,6 +326,25 @@ struct ToBase64UrlFunction { } }; +template +struct FromBase32Function { + VELOX_DEFINE_FUNCTION_TYPES(T); + + FOLLY_ALWAYS_INLINE void call( + out_type& result, + const arg_type& input) { + try { + auto inputSize = input.size(); + result.resize( + encoding::Base32::calculateDecodedSize(input.data(), inputSize)); + encoding::Base32::decode( + input.data(), inputSize, result.data(), result.size()); + } catch (const encoding::EncoderException& e) { + VELOX_USER_FAIL(e.what()); + } + } +}; + template struct FromBigEndian32 { VELOX_DEFINE_FUNCTION_TYPES(T); diff --git a/velox/functions/prestosql/registration/BinaryFunctionsRegistration.cpp b/velox/functions/prestosql/registration/BinaryFunctionsRegistration.cpp index 3004e2c451594..818e1819f7f09 100644 --- a/velox/functions/prestosql/registration/BinaryFunctionsRegistration.cpp +++ b/velox/functions/prestosql/registration/BinaryFunctionsRegistration.cpp @@ -51,6 +51,8 @@ void registerSimpleFunctions(const std::string& prefix) { {prefix + "to_base64url"}); registerFunction( {prefix + "from_base64url"}); + registerFunction( + {prefix + "from_base32"}); registerFunction( {prefix + "from_big_endian_32"}); diff --git a/velox/functions/prestosql/tests/BinaryFunctionsTest.cpp b/velox/functions/prestosql/tests/BinaryFunctionsTest.cpp index bcd3d3cdaf595..ea2b951158b8f 100644 --- a/velox/functions/prestosql/tests/BinaryFunctionsTest.cpp +++ b/velox/functions/prestosql/tests/BinaryFunctionsTest.cpp @@ -468,6 +468,42 @@ TEST_F(BinaryFunctionsTest, fromBase64Url) { EXPECT_THROW(fromBase64Url("YQ=/"), VeloxUserError); } +TEST_F(BinaryFunctionsTest, fromBase32) { + const auto fromBase32 = [&](std::optional value) { + return evaluateOnce("from_base32(c0)", value); + }; + + EXPECT_EQ(std::nullopt, fromBase32(std::nullopt)); + EXPECT_EQ("", fromBase32("")); + EXPECT_EQ("a", fromBase32("ME======")); + EXPECT_EQ("ab", fromBase32("MFRA====")); + EXPECT_EQ("abc", fromBase32("MFRGG===")); + EXPECT_EQ("db2", fromBase32("MRRDE===")); + EXPECT_EQ("abcd", fromBase32("MFRGGZA=")); + EXPECT_EQ("hello world", fromBase32("NBSWY3DPEB3W64TMMQ======")); + EXPECT_EQ( + "Hello World from Velox!", + fromBase32("JBSWY3DPEBLW64TMMQQGM4TPNUQFMZLMN54CC===")); + + // Try encoded strings without padding + EXPECT_EQ("a", fromBase32("ME")); + EXPECT_EQ("ab", fromBase32("MFRA")); + EXPECT_EQ("abc", fromBase32("MFRGG")); + EXPECT_EQ("db2", fromBase32("MRRDE")); + EXPECT_EQ("abcd", fromBase32("MFRGGZA")); + EXPECT_EQ("1234", fromBase32("GEZDGNA")); + EXPECT_EQ("abcde", fromBase32("MFRGGZDF")); + EXPECT_EQ("abcdef", fromBase32("MFRGGZDFMY")); + + // Check with invaild encoded strings + EXPECT_THROW(fromBase32("1="), VeloxUserError); + EXPECT_THROW(fromBase32("M1======"), VeloxUserError); + + VELOX_ASSERT_THROW( + fromBase32("J1======"), + "decode() - invalid input string: invalid characters"); +} + TEST_F(BinaryFunctionsTest, fromBigEndian32) { const auto fromBigEndian32 = [&](const std::optional& arg) { return evaluateOnce(