In which encoding is 0xDB a currency symbol?

问题

I received files which, sadly, I cannot get info about how they were generated. I need to parse these files.

The file is entirely ASCII besides for one character: 0xDB (in decimal it gives 219).

Obviously (from looking at the file) this character is a currency symbol. I know it because:

it is mandatory for these files to contain a currency symbol anywhere an amount appears
there's no other currency symbol (neither $ nor euro nor nothing) nowhere in the files
everytime that 0xDB appears it's next to an amount

I think that in these files that 0xDB is supposed to represent the Euro symbol (it is actually very highly probable that this 0xDB appears everywhere a Euro symbol is supposed to appear).

The file command says this about the files:

ISO-8859 English text, with CRLF, LF line terminators

An hexdump gives this:

00000030  71 75 61 6e 74 20 db 32  2e 36 30 0a 20 41 49 4d  |quant .2.60. AIM|
                            ^^                                     ^

The files are all otherwise normally formatted/parsable. Actually I'm getting all the infos fine besides for that weird 0xDB character.

Does anyone know what's going on? How did a currency symbol (supposedly the euro symbol) somehow become a 0xDB?

It's neither ISO-8859-1 (aka ISO Latin 1) nor ISO-8859-15 because in both case code point 219 corresponds to 'Û' (just as Unicode codepoint 219 is 'LATIN CAPITAL LETTER U WITH CIRCUMFLEX').

It's not extended-ASCII.

回答1:

It could be Mac OS Roman

回答2:

It's MacRoman. In fact it has to be -- that's the only charset in which the Euro sign maps to 0xDB.

Here's the full charset mapping for MacRoman.

回答3:

Using the macroman script, one learns:

$ macroman 0xDB
MacRoman DB  ⇒  U+20AC  ‹€›  \N{ EURO SIGN }

You can go the other way, too:

$ macroman U+00E9
MacRoman 8E  ⇐  U+00E9  ‹é›  \N{ LATIN SMALL LETTER E WITH ACUTE }

And we know that U+20AC EURO SIGN is indeed a currency symbol because of the uniprops script’s output:

$ uniprops -a U+20AC
U+20AC <€> \N{ EURO SIGN }:
    \pS \p{Sc}
    All Any Assigned InCurrencySymbols Common Zyyy Currency_Symbol Sc Currency_Symbols S Gr_Base Grapheme_Base Graph GrBase Print Symbol X_POSIX_Graph X_POSIX_Print
    Age=2.1 Bidi_Class=ET Bidi_Class=European_Terminator BC=ET Block=Currency_Symbols Canonical_Combining_Class=0 Canonical_Combining_Class=Not_Reordered CCC=NR Canonical_Combining_Class=NR Script=Common Decomposition_Type=None DT=None East_Asian_Width=A East_Asian_Width=Ambiguous EA=A Grapheme_Cluster_Break=Other GCB=XX Grapheme_Cluster_Break=XX Hangul_Syllable_Type=NA Hangul_Syllable_Type=Not_Applicable HST=NA Joining_Group=No_Joining_Group JG=NoJoiningGroup Joining_Type=Non_Joining JT=U Joining_Type=U Line_Break=PR Line_Break=Prefix_Numeric LB=PR Numeric_Type=None NT=None Numeric_Value=NaN NV=NaN Present_In=2.1 IN=2.1 Present_In=3.0 IN=3.0 Present_In=3.1 IN=3.1 Present_In=3.2 IN=3.2 Present_In=4.0 IN=4.0 Present_In=4.1 IN=4.1 Present_In=5.0 IN=5.0 Present_In=5.1 IN=5.1 Present_In=5.2 IN=5.2 Present_In=6.0 IN=6.0 SC=Zyyy Script=Zyyy Sentence_Break=Other SB=XX Sentence_Break=XX Word_Break=Other WB=XX Word_Break=XX _X_Begin

回答4:

0xDB represents the Euro sign in the Mac OS Roman character encoding.

来源：https://stackoverflow.com/questions/4844180/in-which-encoding-is-0xdb-a-currency-symbol

标签

character-encoding

ascii

non-ascii-characters

euro