зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
3.5 KiB
C++
134 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsID.h"
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#include "nsMemory.h"
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#include "mozilla/Snprintf.h"
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void nsID::Clear()
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{
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m0 = 0;
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m1 = 0;
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m2 = 0;
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for (int i = 0; i < 8; ++i) {
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m3[i] = 0;
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}
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}
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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 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 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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* 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 { int32_t _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 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 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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bool
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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 false;
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}
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bool expectFormat1 = (aIDStr[0] == '{');
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if (expectFormat1) {
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++aIDStr;
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}
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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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}
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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 == '}' : true;
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}
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#ifndef XPCOM_GLUE_AVOID_NSPR
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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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/*
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* Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
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* format. The string is allocated with NS_Alloc and should be freed by
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* the caller.
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*/
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char*
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nsID::ToString() const
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{
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char* res = (char*)NS_Alloc(NSID_LENGTH);
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if (res) {
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snprintf(res, NSID_LENGTH, gIDFormat,
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m0, (uint32_t)m1, (uint32_t)m2,
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(uint32_t)m3[0], (uint32_t)m3[1], (uint32_t)m3[2],
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(uint32_t)m3[3], (uint32_t)m3[4], (uint32_t)m3[5],
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(uint32_t)m3[6], (uint32_t)m3[7]);
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}
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return res;
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}
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void
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nsID::ToProvidedString(char (&aDest)[NSID_LENGTH]) const
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{
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snprintf_literal(aDest, gIDFormat,
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m0, (uint32_t)m1, (uint32_t)m2,
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(uint32_t)m3[0], (uint32_t)m3[1], (uint32_t)m3[2],
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(uint32_t)m3[3], (uint32_t)m3[4], (uint32_t)m3[5],
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(uint32_t)m3[6], (uint32_t)m3[7]);
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}
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#endif // XPCOM_GLUE_AVOID_NSPR
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