1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/glue/nsID.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,116 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsID.h"
1.10 +#include "prprf.h"
1.11 +#include "nsMemory.h"
1.12 +
1.13 +/**
1.14 + * Multiplies the_int_var with 16 (0x10) and adds the value of the
1.15 + * hexadecimal digit the_char. If it fails it returns false from
1.16 + * the function it's used in.
1.17 + */
1.18 +
1.19 +#define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \
1.20 + the_int_var = (the_int_var << 4) + the_char; \
1.21 + if(the_char >= '0' && the_char <= '9') the_int_var -= '0'; \
1.22 + else if(the_char >= 'a' && the_char <= 'f') the_int_var -= 'a'-10; \
1.23 + else if(the_char >= 'A' && the_char <= 'F') the_int_var -= 'A'-10; \
1.24 + else return false
1.25 +
1.26 +
1.27 +/**
1.28 + * Parses number_of_chars characters from the char_pointer pointer and
1.29 + * puts the number in the dest_variable. The pointer is moved to point
1.30 + * at the first character after the parsed ones. If it fails it returns
1.31 + * false from the function the macro is used in.
1.32 + */
1.33 +
1.34 +#define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \
1.35 + do { int32_t _i=number_of_chars; \
1.36 + dest_variable = 0; \
1.37 + while(_i) { \
1.38 + ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \
1.39 + char_pointer++; \
1.40 + _i--; \
1.41 + } } while(0)
1.42 +
1.43 +
1.44 +/**
1.45 + * Parses a hyphen from the char_pointer string. If there is no hyphen there
1.46 + * the function returns false from the function it's used in. The
1.47 + * char_pointer is advanced one step.
1.48 + */
1.49 +
1.50 + #define PARSE_HYPHEN(char_pointer) if(*(char_pointer++) != '-') return false
1.51 +
1.52 +/*
1.53 + * Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into
1.54 + * an nsID. It can also handle the old format without the { and }.
1.55 + */
1.56 +
1.57 +bool nsID::Parse(const char *aIDStr)
1.58 +{
1.59 + /* Optimized for speed */
1.60 + if(!aIDStr) {
1.61 + return false;
1.62 + }
1.63 +
1.64 + bool expectFormat1 = (aIDStr[0] == '{');
1.65 + if(expectFormat1) aIDStr++;
1.66 +
1.67 + PARSE_CHARS_TO_NUM(aIDStr, m0, 8);
1.68 + PARSE_HYPHEN(aIDStr);
1.69 + PARSE_CHARS_TO_NUM(aIDStr, m1, 4);
1.70 + PARSE_HYPHEN(aIDStr);
1.71 + PARSE_CHARS_TO_NUM(aIDStr, m2, 4);
1.72 + PARSE_HYPHEN(aIDStr);
1.73 + int i;
1.74 + for(i=0; i<2; i++)
1.75 + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
1.76 + PARSE_HYPHEN(aIDStr);
1.77 + while(i < 8) {
1.78 + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
1.79 + i++;
1.80 + }
1.81 +
1.82 + return expectFormat1 ? *aIDStr == '}' : true;
1.83 +}
1.84 +
1.85 +#ifndef XPCOM_GLUE_AVOID_NSPR
1.86 +
1.87 +static const char gIDFormat[] =
1.88 + "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}";
1.89 +
1.90 +/*
1.91 + * Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
1.92 + * format. The string is allocated with NS_Alloc and should be freed by
1.93 + * the caller.
1.94 + */
1.95 +
1.96 +char *nsID::ToString() const
1.97 +{
1.98 + char *res = (char*)NS_Alloc(NSID_LENGTH);
1.99 +
1.100 + if (res != nullptr) {
1.101 + PR_snprintf(res, NSID_LENGTH, gIDFormat,
1.102 + m0, (uint32_t) m1, (uint32_t) m2,
1.103 + (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2],
1.104 + (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5],
1.105 + (uint32_t) m3[6], (uint32_t) m3[7]);
1.106 + }
1.107 + return res;
1.108 +}
1.109 +
1.110 +void nsID::ToProvidedString(char (&dest)[NSID_LENGTH]) const
1.111 +{
1.112 + PR_snprintf(dest, NSID_LENGTH, gIDFormat,
1.113 + m0, (uint32_t) m1, (uint32_t) m2,
1.114 + (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2],
1.115 + (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5],
1.116 + (uint32_t) m3[6], (uint32_t) m3[7]);
1.117 +}
1.118 +
1.119 +#endif // XPCOM_GLUE_AVOID_NSPR
