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GH-49502: [Parquet][C++] Fix missing overflow check for dictionary encoder indices count #49513

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GH-49502: [Parquet][C++] Fix missing overflow check for dictionary encoder indices count #49513

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6 changes: 6 additions & 0 deletions cpp/src/parquet/encoder.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -541,6 +541,12 @@ class DictEncoderImpl : public EncoderImpl, virtual public DictEncoder<DType> {
size_t buffer_position = buffered_indices_.size();
buffered_indices_.resize(buffer_position +
static_cast<size_t>(data.length() - data.null_count()));
if (buffered_indices_.size() >
static_cast<size_t>(std::numeric_limits<int32_t>::max())) {
throw ParquetException("Total dictionary indices count (",
buffered_indices_.size(),
") exceeds maximum int value");
}
::arrow::internal::VisitSetBitRunsVoid(
data.null_bitmap_data(), data.offset(), data.length(),
[&](int64_t position, int64_t length) {
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