zipfile.c fails to calculate the CRC32 value if the compression method
is explicitly set to 0. Example SQL:
INSERT INTO zz(name, mode, mtime, data, method)
VALUES('f.txt', '-rw-r--r--', 1000000000, 'abcde', 0);
As a result, a CRC32 value of 0 is written to the file. Some archive
managers handle CRC32 discrepancies as errors, i.e. http://www.7-zip.org.
Extra braces around the highlighted if block ensure that CRC32 is
calculated regardless of compression:
http://www.sqlite.org/src/artifact?name=cc12e900e12eec23&ln=1340-1349
For testing purposes, it might be helpful to add a CRC32 column to the
zipfile virtual table.
Ralf
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