From 3f419afac56065233fd9a69db3b5e2d4c6113648 Mon Sep 17 00:00:00 2001 From: Christian Heimes Date: Fri, 4 Jan 2008 03:08:33 +0000 Subject: Merged revisions 59696-59702 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r59696 | amaury.forgeotdarc | 2008-01-04 03:04:15 +0100 (Fri, 04 Jan 2008) | 11 lines Partial port of r59682 from py3k. On Windows, when import fails to load a dll module, the message says "error code 193" instead of a more informative text. It turns out that FormatMessage needs additional parameters for some error codes. For example: 193 means "%1 is not a valid Win32 application". Since it is impossible to know which parameter to pass, we use FORMAT_MESSAGE_IGNORE_INSERTS to get the raw message, which is still better than the number. ........ r59698 | andrew.kuchling | 2008-01-04 03:26:00 +0100 (Fri, 04 Jan 2008) | 1 line Typo fix ........ r59699 | andrew.kuchling | 2008-01-04 03:31:40 +0100 (Fri, 04 Jan 2008) | 1 line Add math items; other edits ........ r59700 | christian.heimes | 2008-01-04 03:46:19 +0100 (Fri, 04 Jan 2008) | 1 line Fixed refleak tests for _struct changes ........ r59701 | christian.heimes | 2008-01-04 03:54:42 +0100 (Fri, 04 Jan 2008) | 1 line Added _struct._clearcache() for regression tests ........ --- Lib/struct.py | 111 ++-------------------------------------------------------- 1 file changed, 2 insertions(+), 109 deletions(-) (limited to 'Lib/struct.py') diff --git a/Lib/struct.py b/Lib/struct.py index 45f6729a17..3784c055be 100644 --- a/Lib/struct.py +++ b/Lib/struct.py @@ -1,109 +1,2 @@ -""" -Functions to convert between Python values and C structs. -Python strings are used to hold the data representing the C struct -and also as format strings to describe the layout of data in the C struct. - -The optional first format char indicates byte order, size and alignment: - @: native order, size & alignment (default) - =: native order, std. size & alignment - <: little-endian, std. size & alignment - >: big-endian, std. size & alignment - !: same as > - -The remaining chars indicate types of args and must match exactly; -these can be preceded by a decimal repeat count: - x: pad byte (no data); c:char; b:signed byte; B:unsigned byte; - h:short; H:unsigned short; i:int; I:unsigned int; - l:long; L:unsigned long; f:float; d:double. -Special cases (preceding decimal count indicates length): - s:string (array of char); p: pascal string (with count byte). -Special case (only available in native format): - P:an integer type that is wide enough to hold a pointer. -Special case (not in native mode unless 'long long' in platform C): - q:long long; Q:unsigned long long -Whitespace between formats is ignored. - -The variable struct.error is an exception raised on errors. -""" - -__version__ = '3.0' - - -from _struct import Struct as _Struct, error - -class Struct(_Struct): - def __init__(self, fmt): - if isinstance(fmt, str): - fmt = bytes(fmt, 'ascii') - elif isinstance(fmt, buffer): - fmt = bytes(fmt) - _Struct.__init__(self, fmt) - -_MAXCACHE = 100 -_cache = {} - -def _compile(fmt): - # Internal: compile struct pattern - if len(_cache) >= _MAXCACHE: - _cache.clear() - s = Struct(fmt) - _cache[fmt] = s - return s - -def calcsize(fmt): - """ - Return size of C struct described by format string fmt. - See struct.__doc__ for more on format strings. - """ - try: - o = _cache[fmt] - except KeyError: - o = _compile(fmt) - return o.size - -def pack(fmt, *args): - """ - Return string containing values v1, v2, ... packed according to fmt. - See struct.__doc__ for more on format strings. - """ - try: - o = _cache[fmt] - except KeyError: - o = _compile(fmt) - return bytes(o.pack(*args)) - -def pack_into(fmt, buf, offset, *args): - """ - Pack the values v1, v2, ... according to fmt, write - the packed bytes into the writable buffer buf starting at offset. - See struct.__doc__ for more on format strings. - """ - try: - o = _cache[fmt] - except KeyError: - o = _compile(fmt) - o.pack_into(buf, offset, *args) - -def unpack(fmt, s): - """ - Unpack the string, containing packed C structure data, according - to fmt. Requires len(string)==calcsize(fmt). - See struct.__doc__ for more on format strings. - """ - try: - o = _cache[fmt] - except KeyError: - o = _compile(fmt) - return o.unpack(s) - -def unpack_from(fmt, buf, offset=0): - """ - Unpack the buffer, containing packed C structure data, according to - fmt starting at offset. Requires len(buffer[offset:]) >= calcsize(fmt). - See struct.__doc__ for more on format strings. - """ - try: - o = _cache[fmt] - except KeyError: - o = _compile(fmt) - return o.unpack_from(buf, offset) +from _struct import * +from _struct import _clearcache -- cgit v1.2.1