Fix convert.quoted-printable-decode of lowercase hex digits#22870
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iliaal wants to merge 1 commit into
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Fix convert.quoted-printable-decode of lowercase hex digits#22870iliaal wants to merge 1 commit into
iliaal wants to merge 1 commit into
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The stream filter's nibble decoder accepts lowercase a-f via isxdigit() but decodes them as (*ps - 0x37), correct only for uppercase A-F. Bytes whose hex spelling uses a lowercase digit are silently corrupted (=cd decodes to 0xed, =0a to 0x2a). Decode lowercase with (*ps - 0x57).
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The convert.quoted-printable-decode stream filter accepts lowercase hex digits (isxdigit() passes a-f) but its nibble math only handles uppercase, so a hex escape with a lowercase digit decodes to the wrong byte. quoted_printable_decode() decodes lowercase correctly, so the filter and the function disagree.