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fix(bb.js): Truncate buffer_size in bb to the amount of points that we have downloaded #1862

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Aug 29, 2023
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fix(bb.js): Truncate buffer_size in bb to the amount of points that we have downloaded #1862

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9 changes: 8 additions & 1 deletion circuits/cpp/barretenberg/cpp/src/barretenberg/bb/get_crs.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,8 +62,15 @@ inline std::vector<barretenberg::g1::affine_element> get_g1_data(const std::file
vinfo("using cached crs at: ", path);
auto data = read_file(path / "g1.dat");
auto points = std::vector<barretenberg::g1::affine_element>(num_points);

auto size_of_points_in_bytes = num_points * 64;
if (data.size() < size_of_points_in_bytes) {
vinfo("data is smaller than expected!", data.size(), size_of_points_in_bytes);
}
size_t actual_buffer_size = std::min(data.size(), size_of_points_in_bytes);
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barretenberg::srs::IO<curve::BN254>::read_affine_elements_from_buffer(
points.data(), (char*)data.data(), num_points * 64);
points.data(), (char*)data.data(), actual_buffer_size);
return points;
}

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