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Fix #76 fastcdc chunk boundary off-by-one. (#78)

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* Fix #76 fastcdc chunk boundary off-by-one.

This ensures that the last byte included in the gear-hash that identified the
chunk boundary is included in the chunk. This ensures chunks are still matched
when the byte immediately after them is changed.

* Init gear hash to all 1's to prevent zero-length chunks with min_size=0.

Also change the `MaxChunkSize` test to use min_size=0 to test this works.
This commit is contained in:
Donovan Baarda
2023-01-24 00:39:02 +11:00
committed by GitHub
parent efca9855e7
commit 9cf71cae65
2 changed files with 4 additions and 3 deletions
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fastcdc/fastcdc_test.cc
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@@ -195,7 +195,7 @@ TEST_F(ChunkerTest, MinChunkSize) {
// Tests that maximum chunk size is not exceeded.
TEST_F(ChunkerTest, MaxChunkSize) {
Config cfg(32, 64, 128);
Config cfg(0, 64, 128);
std::vector<size_t> chunk_sizes;
TestChunker<> chunker(cfg, [&](const uint8_t* /* data */, size_t len) {
chunk_sizes.push_back(len);