All Versions
28
Latest Version
Avg Release Cycle
32 days
Latest Release
19 days ago

Changelog History
Page 3

  • v2.3.0 Changes

    June 15, 2024

    What's Changed

    • 📜 CSVField: new member function try_parse_decimal() to specify one or more decimal symbols by @wilfz in #226
    • 🏁 Replace the includes of Windows.h with windows.h (#204) by @ludovicdelfau in #235
    • 📜 Use const CSVFormat& in calculate_score by @rajgoel in #236
    • 🛠 Fix memory issues in CSVFieldList by @vincentlaucsb in #237

    Race Condition Notes

    Background

    📜 The CSV Parser tries to perform as few allocations as possible. Instead of naively storing individual CSV fields as singular std::strings in a std::vector, the parser keeps references to the raw input and uses lightweight RawCSVField objects to mark where a specific field starts and ends in that field (as well as flag indicating if an escaped quote is present). This has the benefits of:

    1. Avoiding the cost of constructing many std::string instances
    2. Avoiding the cost of constant std::vector reallocations
    3. Preserving locality of reference

    📜 Furthermore, the CSV Parser also uses separate threads for parsing CSV and for iterating over the data. As CSV rows are parsed, they are made available to the user who may utilize them without interrupting the parsing of new rows.

    The Race Condition

    The RawCSVField objects mentioned previously were stored as contiguous blocks, and an std::vector of pointers to these blocks were used to keep track of them.

    📜 However, as @ludovicdelfau accurately diagnosed, if the reading thread attempted to access a RawCSVField (e.g. through reading a CSVField ) at the same time that a parsing thread was pushing a new RawCSVField to an at-capacity std::vector, the parsing thread's push would cause the contents of the std::vector to be reallocated, thus causing the reading thread to access deallocated memory.

    📜 This issue was first reported in #217.

    The Fix

    👌 The fix was simple. An std::deque was dropped in to replace std::vector to store RawCSVField pointers, as std::deque does not perform reallocations. This change appears to even improve the CSV Parser's performance as the cost of constant reallocations is avoided. The loss of memory locality typical in std::deque applications was avoided as, again, the CSV Parser is storing pointers to RawCSVField[] and not the RawCSVField objects themselves.

    🆕 New Contributors

    Full Changelog : 2.2.3...2.3.0

  • v2.2.3 Changes

    May 26, 2024

    • 🛠 Fix n_rows() being off-by-one when the CSVReader iterator was used (reported in #173)

      • Note : This was due to a simple counting error where the iterator did not increment the row counter for the first row. All rows were still correctly read.

    • 📜 Implement ability to handle arbitrary combinations of \r and \n in line endings (#223)

    • 🛠 Fix CSV writers incorrectly converting decimal values between 0 and -1 to positive numbers

  • v2.2.2 Changes

    May 20, 2024

    What's Changed

    • 👍 Allow parsing of numbers that begin with +, fixing #213
    • 📜 Fix compiler warnings in g++ from using abs and in try_parse_hex() #227

    • 🛠 Fix invalid memory access issue in g++ builds #228

      • Issue was caused when using CSVField methods in conjunction with CSVRow reverse iterators

    • 🏗 CMake options to disable programs building by @BaptisteLemarcis in #148

    🆕 New Contributors

    Full Changelog : 2.2.1...2.2.2

  • v2.2.1 Changes

    May 18, 2024

    📜 This is a simple CMake change that makes it easier to #include "csv.hpp" in a CMake project that grabs csv-parser using FetchContent_Declare().

    What's Changed

    • 📜 Provide directory of library's header as the include directory by @grosscol in #220

    🆕 New Contributors

    Full Changelog : 2.2.0...2.2.1

  • v2.2.0 Changes

    April 03, 2024

  • v2.1.3 Changes

    July 29, 2021
    • 🛠 Fix various compatibility issues with g++ and clang
    • ➕ Added hex value parsing
    • 🛠 Fixed a rare out-of-bounds condition

  • v2.1.2 Changes

    July 27, 2021

    • 🛠 Fixed compilation issues with C++11 and 14.

      • CSV Parser should now be should C++11 compatible once again with g++ 7.5 or up

    • 👍 Allowed users to customize decimal place precision when writing CSVs

    • 🛠 Fixed floating point output

      • Arbitrarily large integers stored in doubles can now be output w/o limits

    • 🛠 Fixed newlines not being escaped by CSVWriter

  • v2.1.1 Changes

    April 15, 2021
    • 🛠 Fixed CSVStats only processing first 5000 rows thanks to @TobyEalden
    • 🛠 Fixed parsing """fields like this""" thanks to @rpadrela
    • 🛠 Fixed CSVReader move semantics thanks to @artpaul