[COMPRESS-724] Fix PAX 1.x sparse header alignment#775
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Do not skip an extra tar record when parsePAX1XSparseHeaders(InputStream, int) finishes reading sparse headers exactly on a record boundary. Add a regression test that keeps the first data byte visible after an aligned sparse header block. Reviewed-by: OpenAI Codex Reviewed-by: Anthropic Claude Code
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Summary
Fix
TarUtils.parsePAX1XSparseHeaders(InputStream, int)so it does not skip an extra tar record when GNU PAX 1.x sparse headers end exactly on a record boundary.Details
Previously, the padding calculation used
recordSize - bytesRead % recordSize. WhenbytesReadwas already aligned torecordSize, this computed a full-record skip instead of0, advancing the stream past real entry data.This change uses modulo padding calculation so aligned sparse headers leave the stream positioned at the first data byte.
Tests
mvn -q -Dtest=org.apache.commons.compress.archivers.tar.TarUtilsTest testmvn -q