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PARQUET-434: Add a ParquetFileReader class
Starting point for build out. Author: Wes McKinney <[email protected]> Closes apache#20 from wesm/parquet-file-reader and squashes the following commits: 8a9e875 [Wes McKinney] Add PARQUET_TEST_DATA to setup_build_env.sh and add to README f7cd165 [Wes McKinney] Create ParquetFileReader class with ParseMetaData method and a basic unit test. Run valgrind and cpplint as part of Travis CI build Change-Id: I4b0931b1f31c2de53703611be5281daaa25746a9
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| Original file line number | Diff line number | Diff line change |
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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you 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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| #ifndef PARQUET_EXCEPTION_H | ||
| #define PARQUET_EXCEPTION_H | ||
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| #include <exception> | ||
| #include <sstream> | ||
| #include <string> | ||
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| namespace parquet_cpp { | ||
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| class ParquetException : public std::exception { | ||
| public: | ||
| static void EofException() { throw ParquetException("Unexpected end of stream."); } | ||
| static void NYI(const std::string& msg) { | ||
| std::stringstream ss; | ||
| ss << "Not yet implemented: " << msg << "."; | ||
| throw ParquetException(ss.str()); | ||
| } | ||
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| explicit ParquetException(const char* msg) : msg_(msg) {} | ||
| explicit ParquetException(const std::string& msg) : msg_(msg) {} | ||
| explicit ParquetException(const char* msg, exception& e) : msg_(msg) {} | ||
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| virtual ~ParquetException() throw() {} | ||
| virtual const char* what() const throw() { return msg_.c_str(); } | ||
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| private: | ||
| std::string msg_; | ||
| }; | ||
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| } // namespace parquet_cpp | ||
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| #endif // PARQUET_EXCEPTION_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you 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 "parquet/reader.h" | ||
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| #include <cstdio> | ||
| #include <vector> | ||
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| #include "parquet/exception.h" | ||
| #include "parquet/thrift/util.h" | ||
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| namespace parquet_cpp { | ||
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| // ---------------------------------------------------------------------- | ||
| // LocalFile methods | ||
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| LocalFile::~LocalFile() { | ||
| // You must explicitly call Close | ||
| } | ||
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| void LocalFile::Open(const std::string& path) { | ||
| path_ = path; | ||
| file_ = fopen(path_.c_str(), "r"); | ||
| is_open_ = true; | ||
| } | ||
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| void LocalFile::Close() { | ||
| if (is_open_) { | ||
| fclose(file_); | ||
| is_open_ = false; | ||
| } | ||
| } | ||
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| size_t LocalFile::Size() { | ||
| fseek(file_, 0L, SEEK_END); | ||
| return Tell(); | ||
| } | ||
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| void LocalFile::Seek(size_t pos) { | ||
| fseek(file_, pos, SEEK_SET); | ||
| } | ||
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| size_t LocalFile::Tell() { | ||
| return ftell(file_); | ||
| } | ||
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| void LocalFile::Read(size_t nbytes, uint8_t* buffer, | ||
| size_t* bytes_read) { | ||
| *bytes_read = fread(buffer, 1, nbytes, file_); | ||
| } | ||
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| // ---------------------------------------------------------------------- | ||
| // ParquetFileReader | ||
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| // 4 byte constant + 4 byte metadata len | ||
| static constexpr uint32_t FOOTER_SIZE = 8; | ||
| static constexpr uint8_t PARQUET_MAGIC[4] = {'P', 'A', 'R', '1'}; | ||
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| void ParquetFileReader::Open(FileLike* buffer) { | ||
| buffer_ = buffer; | ||
| } | ||
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| void ParquetFileReader::Close() { | ||
| buffer_->Close(); | ||
| } | ||
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| void ParquetFileReader::ParseMetaData() { | ||
| size_t filesize = buffer_->Size(); | ||
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| if (filesize < FOOTER_SIZE) { | ||
| throw ParquetException("Corrupted file, smaller than file footer"); | ||
| } | ||
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| size_t bytes_read; | ||
| uint8_t footer_buffer[FOOTER_SIZE]; | ||
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| buffer_->Seek(filesize - FOOTER_SIZE); | ||
| buffer_->Read(FOOTER_SIZE, footer_buffer, &bytes_read); | ||
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| if (bytes_read != FOOTER_SIZE) { | ||
| throw ParquetException("Invalid parquet file. Corrupt footer."); | ||
| } | ||
| if (memcmp(footer_buffer + 4, PARQUET_MAGIC, 4) != 0) { | ||
| throw ParquetException("Invalid parquet file. Corrupt footer."); | ||
| } | ||
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| uint32_t metadata_len = *reinterpret_cast<uint32_t*>(footer_buffer); | ||
| size_t metadata_start = filesize - FOOTER_SIZE - metadata_len; | ||
| if (metadata_start < 0) { | ||
| throw ParquetException("Invalid parquet file. File is less than file metadata size."); | ||
| } | ||
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| buffer_->Seek(metadata_start); | ||
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| std::vector<uint8_t> metadata_buffer(metadata_len); | ||
| buffer_->Read(metadata_len, &metadata_buffer[0], &bytes_read); | ||
| if (bytes_read != metadata_len) { | ||
| throw ParquetException("Invalid parquet file. Could not read metadata bytes."); | ||
| } | ||
| DeserializeThriftMsg(&metadata_buffer[0], &metadata_len, &metadata_); | ||
| } | ||
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| } // namespace parquet_cpp |
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