Move marker check before header 2 access#2
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The 0xFFFFFFFF special-marker check was performed after reading header 2 in the folder path, and separately in the file path. A marker entry at the end of an archive may have no bytes following header 1, so reading header 2 would access past the archive boundary. Consolidate both marker checks into a single block immediately after header 1 parsing, before any header 2 access. Update sit.md to document that marker entries do not carry a header 2 block.
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The 0xFFFFFFFF special-marker check was performed after reading header 2 in the folder path, and separately in the file path. A marker entry at the end of an archive may have no bytes following header 1, so reading header 2 would access past the archive boundary.
Consolidate both marker checks into a single block immediately after header 1 parsing, before any header 2 access. Update sit.md to document that marker entries do not carry a header 2 block.