628 |
conversion, but some of them leave the choice unspecified---to be chosen |
conversion, but some of them leave the choice unspecified---to be chosen |
629 |
heuristically for each file, based on the data. |
heuristically for each file, based on the data. |
630 |
|
|
631 |
In general, a coding system doesn't guarantee a roundtrip identity, |
In general, a coding system doesn't guarantee roundtrip identity: |
632 |
i.e. decoding followed by encoding in the same coding system can |
decoding text then encoding the result in the same coding system can |
633 |
result in the different byte sequence. But there are several coding |
produce a different byte sequence from the one you originally decoded. |
634 |
systems that go guarantee that the result will be the same as what you |
However, the following coding systems do guarantee that the result |
635 |
originally decoded. They are: |
will be the same as what you originally decoded: |
636 |
|
|
637 |
@quotation |
@quotation |
638 |
chinese-big5 chinese-iso-8bit cyrillic-iso-8bit emacs-mule |
chinese-big5 chinese-iso-8bit cyrillic-iso-8bit emacs-mule |
641 |
japanese-iso-8bit japanese-shift-jis korean-iso-8bit raw-text |
japanese-iso-8bit japanese-shift-jis korean-iso-8bit raw-text |
642 |
@end quotation |
@end quotation |
643 |
|
|
644 |
Likewise, a coding systme doesn't guarantee the other way of roundtrip |
Encoding buffer text and then decoding the result can also fail to |
645 |
identity, i.e. encoding buffer text into a coding system followed by |
reproduce the original text. For instance, when you encode Latin-2 |
646 |
decoding again with the same coding system will produce the different |
characters with @code{utf-8} and decode the result using the same |
647 |
buffer text. For instance, when you encode Latin-2 characters by |
coding system, you'll get Unicode characters (of charset |
648 |
@code{utf-8} and decode it back by the same coding system, you'll get |
@code{mule-unicode-0100-24ff}). When you encode Unicode characters |
649 |
Unicode charactes (of charset @code{mule-unicode-0100-24ff}), and when |
with @code{iso-latin-2} and decode them back with the same coding |
650 |
you encode Unicode characters by @code{iso-latin-2} and decode it back |
system, you'll get Latin-2 characters. |
|
by the same coding system, you'll get Latin-2 characters. |
|
651 |
|
|
652 |
@cindex end of line conversion |
@cindex end of line conversion |
653 |
@dfn{End of line conversion} handles three different conventions used |
@dfn{End of line conversion} handles three different conventions used |