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Add constants BOM_UTF8, BOM_UTF16, BOM_UTF16_LE, BOM_UTF16_BE,

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BOM_UTF32, BOM_UTF32_LE and BOM_UTF32_BE that represent the Byte
Order Mark in UTF-8, UTF-16 and UTF-32 encodings for little and
big endian systems.

The old names BOM32_* and BOM64_* were off by a factor of 2.

This closes SF bug http://www.python.org/sf/555360
This commit is contained in:
Walter Dörwald 2002-06-04 15:16:29 +00:00
parent bc48826dc2
commit 474458da48
3 changed files with 53 additions and 27 deletions
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49
Lib/codecs.py
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@ -18,29 +18,44 @@ except ImportError, why:
'Failed to load the builtin codecs: %s' % why
__all__ = ["register", "lookup", "open", "EncodedFile", "BOM", "BOM_BE",
"BOM_LE", "BOM32_BE", "BOM32_LE", "BOM64_BE", "BOM64_LE"]
"BOM_LE", "BOM32_BE", "BOM32_LE", "BOM64_BE", "BOM64_LE",
"BOM_UTF8", "BOM_UTF16", "BOM_UTF16_LE", "BOM_UTF16_BE",
"BOM_UTF32", "BOM_UTF32_LE", "BOM_UTF32_BE"]
### Constants
#
# Byte Order Mark (BOM) and its possible values (BOM_BE, BOM_LE)
# Byte Order Mark (BOM = ZERO WIDTH NO-BREAK SPACE = U+FEFF)
# and its possible byte string values
# for UTF8/UTF16/UTF32 output and little/big endian machines
#
BOM = struct.pack('=H', 0xFEFF)
#
BOM_BE = BOM32_BE = '\376\377'
# corresponds to Unicode U+FEFF in UTF-16 on big endian
# platforms == ZERO WIDTH NO-BREAK SPACE
BOM_LE = BOM32_LE = '\377\376'
# corresponds to Unicode U+FFFE in UTF-16 on little endian
# platforms == defined as being an illegal Unicode character
#
# 64-bit Byte Order Marks
#
BOM64_BE = '\000\000\376\377'
# corresponds to Unicode U+0000FEFF in UCS-4
BOM64_LE = '\377\376\000\000'
# corresponds to Unicode U+0000FFFE in UCS-4
# UTF-8
BOM_UTF8 = '\xef\xbb\xbf'
# UTF-16, little endian
BOM_LE = BOM_UTF16_LE = '\xff\xfe'
# UTF-16, big endian
BOM_BE = BOM_UTF16_BE = '\xfe\xff'
# UTF-32, little endian
BOM_UTF32_LE = '\xff\xfe\x00\x00'
# UTF-32, big endian
BOM_UTF32_BE = '\x00\x00\xfe\xff'
# UTF-16, native endianness
BOM = BOM_UTF16 = struct.pack('=H', 0xFEFF)
# UTF-32, native endianness
BOM_UTF32 = struct.pack('=L', 0x0000FEFF)
# Old broken names (don't use in new code)
BOM32_LE = BOM_UTF16_LE
BOM32_BE = BOM_UTF16_BE
BOM64_LE = BOM_UTF32_LE
BOM64_BE = BOM_UTF32_BE
### Codec base classes (defining the API)