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use encoding_rs::{EncoderResult, Encoding};
// ========================================================================= //
/// A Windows code page.
///
/// Code pages are a legacy Windows mechanism for representing character
/// encodings, but are still used within the MSI file format.
///
/// Not all Windows code pages are supported by this library yet. See
/// [Wikipedia](https://en.wikipedia.org/wiki/Windows_code_page) for a complete
/// list of valid code pages.
#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
pub enum CodePage {
/// [Windows-932 (Japanese Shift JIS)](https://en.wikipedia.org/wiki/Code_page_932_(Microsoft_Windows))
Windows932,
/// [Windows-936 (Chinese (simplified) GBK)](https://en.wikipedia.org/wiki/Code_page_936_(Microsoft_Windows))
Windows936,
/// [Windows-949 (Korean Unified Hangul Code)](https://en.wikipedia.org/wiki/Unified_Hangul_Code)
Windows949,
/// [Windows-950 (Chinese (traditional) Big5)](https://en.wikipedia.org/wiki/Code_page_950)
Windows950,
/// [Windows-951 (Chinese (traditional) Big5-HKSCS)](https://en.wikipedia.org/wiki/Hong_Kong_Supplementary_Character_Set#Microsoft_Windows)
Windows951,
/// [Windows-1250 (Latin 2)](https://en.wikipedia.org/wiki/Windows-1250)
Windows1250,
/// [Windows-1251 (Cyrillic)](https://en.wikipedia.org/wiki/Windows-1251)
Windows1251,
/// [Windows-1252 (Latin 1)](https://en.wikipedia.org/wiki/Windows-1252)
Windows1252,
/// [Windows-1253 (Greek)](https://en.wikipedia.org/wiki/Windows-1253)
Windows1253,
/// [Windows-1254 (Turkish)](https://en.wikipedia.org/wiki/Windows-1254)
Windows1254,
/// [Windows-1255 (Hebrew)](https://en.wikipedia.org/wiki/Windows-1255)
Windows1255,
/// [Windows-1256 (Arabic)](https://en.wikipedia.org/wiki/Windows-1256)
Windows1256,
/// [Windows-1257 (Baltic)](https://en.wikipedia.org/wiki/Windows-1257)
Windows1257,
/// [Windows-1258 (Vietnamese)](https://en.wikipedia.org/wiki/Windows-1258)
Windows1258,
/// [Mac OS Roman](https://en.wikipedia.org/wiki/Mac_OS_Roman)
MacintoshRoman,
/// [Macintosh
/// Cyrillic](https://en.wikipedia.org/wiki/Macintosh_Cyrillic_encoding)
MacintoshCyrillic,
/// [US-ASCII](https://en.wikipedia.org/wiki/ASCII)
UsAscii,
/// [ISO-8859-1 (Latin 1)](https://en.wikipedia.org/wiki/ISO-8859-1)
Iso88591,
/// [ISO-8859-2 (Latin 2)](https://en.wikipedia.org/wiki/ISO-8859-2)
Iso88592,
/// [ISO-8859-3 (South European)](https://en.wikipedia.org/wiki/ISO-8859-3)
Iso88593,
/// [ISO-8859-4 (North European)](https://en.wikipedia.org/wiki/ISO-8859-4)
Iso88594,
/// [ISO-8859-5 (Cyrillic)](https://en.wikipedia.org/wiki/ISO-8859-5)
Iso88595,
/// [ISO-8859-6 (Arabic)](https://en.wikipedia.org/wiki/ISO-8859-6)
Iso88596,
/// [ISO-8859-7 (Greek)](https://en.wikipedia.org/wiki/ISO-8859-7)
Iso88597,
/// [ISO-8859-8 (Hebrew)](https://en.wikipedia.org/wiki/ISO-8859-8)
Iso88598,
/// [UTF-8](https://en.wikipedia.org/wiki/UTF-8)
#[default]
Utf8,
}
impl CodePage {
/// Returns the code page (if any) with the given ID number.
pub fn from_id(id: i32) -> Option<CodePage> {
match id {
0 => Some(CodePage::default()),
932 => Some(CodePage::Windows932),
936 => Some(CodePage::Windows936),
949 => Some(CodePage::Windows949),
950 => Some(CodePage::Windows950),
951 => Some(CodePage::Windows951),
1250 => Some(CodePage::Windows1250),
1251 => Some(CodePage::Windows1251),
1252 => Some(CodePage::Windows1252),
1253 => Some(CodePage::Windows1253),
1254 => Some(CodePage::Windows1254),
1255 => Some(CodePage::Windows1255),
1256 => Some(CodePage::Windows1256),
1257 => Some(CodePage::Windows1257),
1258 => Some(CodePage::Windows1258),
10000 => Some(CodePage::MacintoshRoman),
10007 => Some(CodePage::MacintoshCyrillic),
20127 => Some(CodePage::UsAscii),
28591 => Some(CodePage::Iso88591),
28592 => Some(CodePage::Iso88592),
28593 => Some(CodePage::Iso88593),
28594 => Some(CodePage::Iso88594),
28595 => Some(CodePage::Iso88595),
28596 => Some(CodePage::Iso88596),
28597 => Some(CodePage::Iso88597),
28598 => Some(CodePage::Iso88598),
65001 => Some(CodePage::Utf8),
_ => None,
}
}
/// Returns the ID number used within Windows to represent this code page.
pub fn id(&self) -> i32 {
match *self {
CodePage::Windows932 => 932,
CodePage::Windows936 => 936,
CodePage::Windows949 => 949,
CodePage::Windows950 => 950,
CodePage::Windows951 => 951,
CodePage::Windows1250 => 1250,
CodePage::Windows1251 => 1251,
CodePage::Windows1252 => 1252,
CodePage::Windows1253 => 1253,
CodePage::Windows1254 => 1254,
CodePage::Windows1255 => 1255,
CodePage::Windows1256 => 1256,
CodePage::Windows1257 => 1257,
CodePage::Windows1258 => 1258,
CodePage::MacintoshRoman => 10000,
CodePage::MacintoshCyrillic => 10007,
CodePage::UsAscii => 20127,
CodePage::Iso88591 => 28591,
CodePage::Iso88592 => 28592,
CodePage::Iso88593 => 28593,
CodePage::Iso88594 => 28594,
CodePage::Iso88595 => 28595,
CodePage::Iso88596 => 28596,
CodePage::Iso88597 => 28597,
CodePage::Iso88598 => 28598,
CodePage::Utf8 => 65001,
}
}
/// Returns a human-readable name for this code page.
pub fn name(&self) -> &str {
match *self {
CodePage::Windows932 => "Windows Japanese Shift JIS",
CodePage::Windows936 => "Windows Chinese (simplified) GBK",
CodePage::Windows949 => "Windows Korean Unified Hangul Code",
CodePage::Windows950 => "Windows Chinese (traditional) Big5",
CodePage::Windows951 => "Windows Chinese (traditional) Big5-HKSCS",
CodePage::Windows1250 => "Windows Latin 2",
CodePage::Windows1251 => "Windows Cyrillic",
CodePage::Windows1252 => "Windows Latin 1",
CodePage::Windows1253 => "Windows Greek",
CodePage::Windows1254 => "Windows Turkish",
CodePage::Windows1255 => "Windows Hebrew",
CodePage::Windows1256 => "Windows Arabic",
CodePage::Windows1257 => "Windows Baltic",
CodePage::Windows1258 => "Windows Vietnamese",
CodePage::MacintoshRoman => "Mac OS Roman",
CodePage::MacintoshCyrillic => "Macintosh Cyrillic",
CodePage::UsAscii => "US-ASCII",
CodePage::Iso88591 => "ISO Latin 1",
CodePage::Iso88592 => "ISO Latin 2",
CodePage::Iso88593 => "ISO Latin 3",
CodePage::Iso88594 => "ISO Latin 4",
CodePage::Iso88595 => "ISO Latin/Cyrillic",
CodePage::Iso88596 => "ISO Latin/Arabic",
CodePage::Iso88597 => "ISO Latin/Greek",
CodePage::Iso88598 => "ISO Latin/Hebrew",
CodePage::Utf8 => "UTF-8",
}
}
/// Decodes a byte array into a string, using this code page. Invalid
/// characters will be replaced with a Unicode replacement character
/// (U+FFFD).
pub fn decode(&self, bytes: &[u8]) -> String {
if *self == CodePage::UsAscii {
ascii_decode(bytes)
} else {
self.encoding().decode(bytes).0.into_owned()
}
}
/// Encodes a string into a byte array, using this code page. For
/// non-Unicode code pages, any characters that cannot be represented will
/// be replaced with a code-page-specific replacement character (typically
/// `'?'`).
pub fn encode(&self, string: &str) -> Vec<u8> {
if *self == CodePage::UsAscii {
ascii_encode(string)
} else {
let mut encoder = self.encoding().new_encoder();
let mut bytes = Vec::new();
let mut buffer = [0; 1024];
let mut total_read = 0;
loop {
let (result, read, written) = encoder
.encode_from_utf8_without_replacement(
&string[total_read..],
&mut buffer[..],
true,
);
total_read += read;
bytes.extend_from_slice(&buffer[..written]);
match result {
EncoderResult::InputEmpty => {
break;
}
EncoderResult::OutputFull => {
continue;
}
EncoderResult::Unmappable(_) => {
bytes.push(b'?');
}
}
}
bytes
}
}
fn encoding(&self) -> &'static Encoding {
match *self {
CodePage::Windows932 => encoding_rs::EUC_JP,
CodePage::Windows936 => encoding_rs::BIG5,
CodePage::Windows949 => encoding_rs::EUC_KR,
CodePage::Windows950 | CodePage::Windows951 => encoding_rs::BIG5,
CodePage::Windows1250 => encoding_rs::WINDOWS_1250,
CodePage::Windows1251 => encoding_rs::WINDOWS_1251,
CodePage::Windows1252 => encoding_rs::WINDOWS_1252,
CodePage::Windows1253 => encoding_rs::WINDOWS_1253,
CodePage::Windows1254 => encoding_rs::WINDOWS_1254,
CodePage::Windows1255 => encoding_rs::WINDOWS_1255,
CodePage::Windows1256 => encoding_rs::WINDOWS_1256,
CodePage::Windows1257 => encoding_rs::WINDOWS_1257,
CodePage::Windows1258 => encoding_rs::WINDOWS_1258,
CodePage::MacintoshRoman => &encoding_rs::MACINTOSH_INIT,
CodePage::MacintoshCyrillic => &encoding_rs::X_MAC_CYRILLIC_INIT,
CodePage::Iso88591 => encoding_rs::WINDOWS_1252,
CodePage::Iso88592 => encoding_rs::ISO_8859_2,
CodePage::Iso88593 => encoding_rs::ISO_8859_3,
CodePage::Iso88594 => encoding_rs::ISO_8859_4,
CodePage::Iso88595 => encoding_rs::ISO_8859_5,
CodePage::Iso88596 => encoding_rs::ISO_8859_6,
CodePage::Iso88597 => encoding_rs::ISO_8859_7,
CodePage::Iso88598 => encoding_rs::ISO_8859_8,
CodePage::Utf8 => encoding_rs::UTF_8,
CodePage::UsAscii => unreachable!(), // handled in encode/decode methods
}
}
}
fn ascii_encode(string: &str) -> Vec<u8> {
let mut bytes = Vec::with_capacity(string.len());
for ch in string.chars() {
if ch.is_ascii() {
bytes.push(ch as u8);
} else {
bytes.push(b'?');
}
}
bytes
}
fn ascii_decode(bytes: &[u8]) -> String {
let mut chars = Vec::new();
for ch in bytes {
if ch.is_ascii() {
chars.push(*ch as char);
} else {
chars.push('\u{FFFD}');
}
}
chars.into_iter().collect()
}
// ========================================================================= //
#[cfg(test)]
mod tests {
use super::CodePage;
#[test]
fn id_round_trip() {
let codepages = &[
CodePage::Windows932,
CodePage::Windows936,
CodePage::Windows949,
CodePage::Windows950,
CodePage::Windows951,
CodePage::Windows1250,
CodePage::Windows1251,
CodePage::Windows1252,
CodePage::Windows1253,
CodePage::Windows1254,
CodePage::Windows1255,
CodePage::Windows1256,
CodePage::Windows1257,
CodePage::Windows1258,
CodePage::MacintoshRoman,
CodePage::MacintoshCyrillic,
CodePage::Iso88591,
CodePage::Iso88592,
CodePage::Iso88593,
CodePage::Iso88594,
CodePage::Iso88595,
CodePage::Iso88596,
CodePage::Iso88597,
CodePage::Iso88598,
CodePage::Utf8,
];
for &codepage in codepages.iter() {
assert_eq!(CodePage::from_id(codepage.id()), Some(codepage));
}
}
#[test]
fn decode_string() {
assert_eq!(
&CodePage::Windows1252.decode(b"\xbfQu\xe9 pasa?"),
"¿Qué pasa?"
);
assert_eq!(
&CodePage::MacintoshRoman.decode(b"\xc0Qu\x8e pasa?"),
"¿Qué pasa?"
);
assert_eq!(
&CodePage::Utf8.decode(b"\xc2\xbfQu\xc3\xa9 pasa?"),
"¿Qué pasa?"
);
}
#[test]
fn decoding_error() {
assert_eq!(
&CodePage::Utf8.decode(b"Qu\xee pasa?"),
"Qu\u{fffd} pasa?"
);
}
#[test]
fn encode_string() {
assert_eq!(
&CodePage::Windows1252.encode("¿Qué pasa?") as &[u8],
b"\xbfQu\xe9 pasa?"
);
assert_eq!(
&CodePage::MacintoshRoman.encode("¿Qué pasa?") as &[u8],
b"\xc0Qu\x8e pasa?"
);
assert_eq!(
&CodePage::Utf8.encode("¿Qué pasa?") as &[u8],
b"\xc2\xbfQu\xc3\xa9 pasa?"
);
}
#[test]
fn encoding_error() {
assert_eq!(
&CodePage::Windows1252.encode("Snowman=\u{2603}") as &[u8],
b"Snowman=?"
);
assert_eq!(
&CodePage::UsAscii.encode("¿Qué pasa?") as &[u8],
b"?Qu? pasa?"
);
}
}
// ========================================================================= //