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avoid int32 overflow in BitPackedRunDecoder::GetBatch offset #50089

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avoid int32 overflow in BitPackedRunDecoder::GetBatch offset #50089

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8 changes: 4 additions & 4 deletions cpp/src/arrow/util/rle_encoding_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -371,15 +371,15 @@ class BitPackedRunDecoder {
/// left.
[[nodiscard]] rle_size_t GetBatch(value_type* out, rle_size_t batch_size,
rle_size_t value_bit_width) {
const int bits_read = values_read_ * value_bit_width;
const int bytes_fully_read = bits_read / 8;
const int64_t bits_read = static_cast<int64_t>(values_read_) * value_bit_width;
const int64_t bytes_fully_read = bits_read / 8;
const uint8_t* unread_data = data_ + bytes_fully_read;

const ::arrow::internal::UnpackOptions opts{
/* .batch_size= */ std::min(batch_size, remaining()),
/* .bit_width= */ value_bit_width,
/* .bit_offset= */ bits_read % 8,
/* .max_read_bytes= */ max_read_bytes_ - bytes_fully_read,
/* .bit_offset= */ static_cast<int>(bits_read % 8),
/* .max_read_bytes= */ static_cast<int>(max_read_bytes_ - bytes_fully_read),
};

if constexpr (std::is_same_v<T, bool>) {
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