FTP: Allow 0-byte file sizes and harden size parsing #2243
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Interpret 213 SIZE as a decimal prefix. Parse leading digits and ignore trailing text. If missing digits, overflow, or negative, warn and mark size unknown (-1). Accept 0 to fix HEAD on empty files. Keep restart logic safe by not using REST when size is unknown.
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Current PR poorly duplicates complex httpHeaderParseOffset() code. I support improving this FTP size parser, but it is better to wait for my planned PR that implements high-quality reusable integer parser than to add one more complex variation that PR would have to deal with. I am labeling this PR accordingly.
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Previously, we interpreted 213 SIZE by reading only the decimal
prefix, parsing leading digits and ignoring any trailing text and
accepted 0 to fix HEAD on empty files. If digits are missing, the value
overflows, or is negative, we warn and mark the size unknown (-1).