зеркало из https://github.com/mozilla/gecko-dev.git
126 строки
3.8 KiB
C++
126 строки
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Daniel Bratell <bratell@lysator.liu.se>
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*/
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#include "nsID.h"
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#include "prprf.h"
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#include "prmem.h"
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static const char gIDFormat[] =
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"{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}";
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static const char gIDFormat2[] =
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"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x";
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/**
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* Multiplies the_int_var with 16 (0x10) and adds the value of the
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* hexadecimal digit the_char. If it fails it returns PR_FALSE from
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* the function it's used in.
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*/
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#define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \
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the_int_var = (the_int_var << 4) + the_char; \
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if(the_char >= '0' && the_char <= '9') the_int_var -= '0'; \
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else if(the_char >= 'a' && the_char <= 'f') the_int_var -= 'a'-10; \
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else if(the_char >= 'A' && the_char <= 'F') the_int_var -= 'A'-10; \
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else return PR_FALSE
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/**
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* Parses number_of_chars characters from the char_pointer pointer and
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* puts the number in the dest_variable. The pointer is moved to point
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* at the first character after the parsed ones. If it fails it returns
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* PR_FALSE from the function the macro is used in.
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*/
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#define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \
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do { PRInt32 _i=number_of_chars; \
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dest_variable = 0; \
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while(_i) { \
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ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \
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char_pointer++; \
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_i--; \
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} } while(0)
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/**
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* Parses a hyphen from the char_pointer string. If there is no hyphen there
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* the function returns PR_FALSE from the function it's used in. The
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* char_pointer is advanced one step.
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*/
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#define PARSE_HYPHEN(char_pointer) if(*(char_pointer++) != '-') return PR_FALSE
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/*
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* Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into
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* an nsID. It can also handle the old format without the { and }.
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*/
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NS_COM PRBool nsID::Parse(const char *aIDStr)
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{
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/* Optimized for speed */
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if(!aIDStr) {
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return PR_FALSE;
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}
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PRBool expectFormat1 = (aIDStr[0] == '{');
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if(expectFormat1) aIDStr++;
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PARSE_CHARS_TO_NUM(aIDStr, m0, 8);
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PARSE_HYPHEN(aIDStr);
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PARSE_CHARS_TO_NUM(aIDStr, m1, 4);
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PARSE_HYPHEN(aIDStr);
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PARSE_CHARS_TO_NUM(aIDStr, m2, 4);
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PARSE_HYPHEN(aIDStr);
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int i;
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for(i=0; i<2; i++)
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PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
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PARSE_HYPHEN(aIDStr);
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while(i < 8) {
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PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
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i++;
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}
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return expectFormat1 ? *aIDStr == '}' : PR_TRUE;
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}
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/*
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* Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
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* format. The string is allocated with PR_Malloc and should be freed by
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* the caller.
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*/
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NS_COM char *nsID::ToString() const
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{
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char *res = (char*)PR_Malloc(39); // use PR_Malloc if this is to be freed with nsCRT::free
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if (res != NULL) {
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PR_snprintf(res, 39, gIDFormat,
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m0, (PRUint32) m1, (PRUint32) m2,
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(PRUint32) m3[0], (PRUint32) m3[1], (PRUint32) m3[2],
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(PRUint32) m3[3], (PRUint32) m3[4], (PRUint32) m3[5],
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(PRUint32) m3[6], (PRUint32) m3[7]);
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}
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return res;
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}
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