forked from apache/arrow
-
Notifications
You must be signed in to change notification settings - Fork 3
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
PARQUET-434: Add a ParquetFileReader class
Starting point for build out. Author: Wes McKinney <wes@cloudera.com> 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
- Loading branch information
Showing
9 changed files
with
361 additions
and
74 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // 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. | ||
|
|
||
| #ifndef PARQUET_EXCEPTION_H | ||
| #define PARQUET_EXCEPTION_H | ||
|
|
||
| #include <exception> | ||
| #include <sstream> | ||
| #include <string> | ||
|
|
||
| namespace parquet_cpp { | ||
|
|
||
| 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()); | ||
| } | ||
|
|
||
| explicit ParquetException(const char* msg) : msg_(msg) {} | ||
| explicit ParquetException(const std::string& msg) : msg_(msg) {} | ||
| explicit ParquetException(const char* msg, exception& e) : msg_(msg) {} | ||
|
|
||
| virtual ~ParquetException() throw() {} | ||
| virtual const char* what() const throw() { return msg_.c_str(); } | ||
|
|
||
| private: | ||
| std::string msg_; | ||
| }; | ||
|
|
||
| } // namespace parquet_cpp | ||
|
|
||
| #endif // PARQUET_EXCEPTION_H |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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. | ||
|
|
||
| #include "parquet/reader.h" | ||
|
|
||
| #include <cstdio> | ||
| #include <vector> | ||
|
|
||
| #include "parquet/exception.h" | ||
| #include "parquet/thrift/util.h" | ||
|
|
||
| namespace parquet_cpp { | ||
|
|
||
| // ---------------------------------------------------------------------- | ||
| // LocalFile methods | ||
|
|
||
| LocalFile::~LocalFile() { | ||
| // You must explicitly call Close | ||
| } | ||
|
|
||
| void LocalFile::Open(const std::string& path) { | ||
| path_ = path; | ||
| file_ = fopen(path_.c_str(), "r"); | ||
| is_open_ = true; | ||
| } | ||
|
|
||
| void LocalFile::Close() { | ||
| if (is_open_) { | ||
| fclose(file_); | ||
| is_open_ = false; | ||
| } | ||
| } | ||
|
|
||
| size_t LocalFile::Size() { | ||
| fseek(file_, 0L, SEEK_END); | ||
| return Tell(); | ||
| } | ||
|
|
||
| void LocalFile::Seek(size_t pos) { | ||
| fseek(file_, pos, SEEK_SET); | ||
| } | ||
|
|
||
| size_t LocalFile::Tell() { | ||
| return ftell(file_); | ||
| } | ||
|
|
||
| void LocalFile::Read(size_t nbytes, uint8_t* buffer, | ||
| size_t* bytes_read) { | ||
| *bytes_read = fread(buffer, 1, nbytes, file_); | ||
| } | ||
|
|
||
| // ---------------------------------------------------------------------- | ||
| // ParquetFileReader | ||
|
|
||
| // 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'}; | ||
|
|
||
| void ParquetFileReader::Open(FileLike* buffer) { | ||
| buffer_ = buffer; | ||
| } | ||
|
|
||
| void ParquetFileReader::Close() { | ||
| buffer_->Close(); | ||
| } | ||
|
|
||
| void ParquetFileReader::ParseMetaData() { | ||
| size_t filesize = buffer_->Size(); | ||
|
|
||
| if (filesize < FOOTER_SIZE) { | ||
| throw ParquetException("Corrupted file, smaller than file footer"); | ||
| } | ||
|
|
||
| size_t bytes_read; | ||
| uint8_t footer_buffer[FOOTER_SIZE]; | ||
|
|
||
| buffer_->Seek(filesize - FOOTER_SIZE); | ||
| buffer_->Read(FOOTER_SIZE, footer_buffer, &bytes_read); | ||
|
|
||
| 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."); | ||
| } | ||
|
|
||
| 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."); | ||
| } | ||
|
|
||
| buffer_->Seek(metadata_start); | ||
|
|
||
| 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_); | ||
| } | ||
|
|
||
| } // namespace parquet_cpp |
Oops, something went wrong.