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SafeFN:: (6 methods):
encode()
decode()
validatePrintableUtf8()
validateSafe()
unicodeToSafe()
safeToUnicode()
| encode($filename) X-Ref |
| Convert an UTF-8 string to a safe ASCII String conversion process - if codepoint is a plain or post_indicator character, - if previous character was "converted", append post_indicator to output, clear "converted" flag - append ascii byte for character to output (continue to next character) - if codepoint is a pre_indicator character, - append ascii byte for character to output, set "converted" flag (continue to next character) (all remaining characters) - reduce codepoint value for non-printable ASCII characters (0x00 - 0x1f). Space becomes our zero. - convert reduced value to base36 (0-9a-z) - append $pre_indicator characater followed by base36 string to output, set converted flag (continue to next character) param: string $filename a utf8 string, should only include printable characters - not 0x00-0x1f return: string an encoded representation of $filename using only 'safe' ASCII characters author: Christopher Smith <chris@jalakai.co.uk> |
| decode($filename) X-Ref |
| decoding process - split the string into substrings at any occurrence of pre or post indicator characters - check the first character of the substring - if its not a pre_indicator character - if previous character was converted, skip over post_indicator character - copy codepoint values of remaining characters to the output array - clear any converted flag (continue to next substring) _ else (its a pre_indicator character) - if string length is 1, copy the post_indicator character to the output array (continue to next substring) - else (string length > 1) - skip the pre-indicator character and convert remaining string from base36 to base10 - increase codepoint value for non-printable ASCII characters (add 0x20) - append codepoint to output array (continue to next substring) param: string $filename a 'safe' encoded ASCII string, return: string decoded utf8 representation of $filename author: Christopher Smith <chris@jalakai.co.uk> |
| validatePrintableUtf8($printable_utf8) X-Ref |
| No description |
| validateSafe($safe) X-Ref |
| No description |
| unicodeToSafe($unicode) X-Ref |
| convert an array of unicode codepoints into 'safe_filename' format param: array int $unicode an array of unicode codepoints return: string the unicode represented in 'safe_filename' format author: Christopher Smith <chris@jalakai.co.uk> |
| safeToUnicode($safe) X-Ref |
| convert a 'safe_filename' string into an array of unicode codepoints param: string $safe a filename in 'safe_filename' format return: array int an array of unicode codepoints author: Christopher Smith <chris@jalakai.co.uk> |