The Tor Browser / file comparison
comparison: xpcom/glue/nsID.cpp
xpcom/glue/nsID.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:d1e9d069d593 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsID.h" | |
| 7 #include "prprf.h" | |
| 8 #include "nsMemory.h" | |
| 9 | |
| 10 /** | |
| 11 * Multiplies the_int_var with 16 (0x10) and adds the value of the | |
| 12 * hexadecimal digit the_char. If it fails it returns false from | |
| 13 * the function it's used in. | |
| 14 */ | |
| 15 | |
| 16 #define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \ | |
| 17 the_int_var = (the_int_var << 4) + the_char; \ | |
| 18 if(the_char >= '0' && the_char <= '9') the_int_var -= '0'; \ | |
| 19 else if(the_char >= 'a' && the_char <= 'f') the_int_var -= 'a'-10; \ | |
| 20 else if(the_char >= 'A' && the_char <= 'F') the_int_var -= 'A'-10; \ | |
| 21 else return false | |
| 22 | |
| 23 | |
| 24 /** | |
| 25 * Parses number_of_chars characters from the char_pointer pointer and | |
| 26 * puts the number in the dest_variable. The pointer is moved to point | |
| 27 * at the first character after the parsed ones. If it fails it returns | |
| 28 * false from the function the macro is used in. | |
| 29 */ | |
| 30 | |
| 31 #define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \ | |
| 32 do { int32_t _i=number_of_chars; \ | |
| 33 dest_variable = 0; \ | |
| 34 while(_i) { \ | |
| 35 ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \ | |
| 36 char_pointer++; \ | |
| 37 _i--; \ | |
| 38 } } while(0) | |
| 39 | |
| 40 | |
| 41 /** | |
| 42 * Parses a hyphen from the char_pointer string. If there is no hyphen there | |
| 43 * the function returns false from the function it's used in. The | |
| 44 * char_pointer is advanced one step. | |
| 45 */ | |
| 46 | |
| 47 #define PARSE_HYPHEN(char_pointer) if(*(char_pointer++) != '-') return false | |
| 48 | |
| 49 /* | |
| 50 * Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into | |
| 51 * an nsID. It can also handle the old format without the { and }. | |
| 52 */ | |
| 53 | |
| 54 bool nsID::Parse(const char *aIDStr) | |
| 55 { | |
| 56 /* Optimized for speed */ | |
| 57 if(!aIDStr) { | |
| 58 return false; | |
| 59 } | |
| 60 | |
| 61 bool expectFormat1 = (aIDStr[0] == '{'); | |
| 62 if(expectFormat1) aIDStr++; | |
| 63 | |
| 64 PARSE_CHARS_TO_NUM(aIDStr, m0, 8); | |
| 65 PARSE_HYPHEN(aIDStr); | |
| 66 PARSE_CHARS_TO_NUM(aIDStr, m1, 4); | |
| 67 PARSE_HYPHEN(aIDStr); | |
| 68 PARSE_CHARS_TO_NUM(aIDStr, m2, 4); | |
| 69 PARSE_HYPHEN(aIDStr); | |
| 70 int i; | |
| 71 for(i=0; i<2; i++) | |
| 72 PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); | |
| 73 PARSE_HYPHEN(aIDStr); | |
| 74 while(i < 8) { | |
| 75 PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); | |
| 76 i++; | |
| 77 } | |
| 78 | |
| 79 return expectFormat1 ? *aIDStr == '}' : true; | |
| 80 } | |
| 81 | |
| 82 #ifndef XPCOM_GLUE_AVOID_NSPR | |
| 83 | |
| 84 static const char gIDFormat[] = | |
| 85 "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}"; | |
| 86 | |
| 87 /* | |
| 88 * Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} | |
| 89 * format. The string is allocated with NS_Alloc and should be freed by | |
| 90 * the caller. | |
| 91 */ | |
| 92 | |
| 93 char *nsID::ToString() const | |
| 94 { | |
| 95 char *res = (char*)NS_Alloc(NSID_LENGTH); | |
| 96 | |
| 97 if (res != nullptr) { | |
| 98 PR_snprintf(res, NSID_LENGTH, gIDFormat, | |
| 99 m0, (uint32_t) m1, (uint32_t) m2, | |
| 100 (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2], | |
| 101 (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5], | |
| 102 (uint32_t) m3[6], (uint32_t) m3[7]); | |
| 103 } | |
| 104 return res; | |
| 105 } | |
| 106 | |
| 107 void nsID::ToProvidedString(char (&dest)[NSID_LENGTH]) const | |
| 108 { | |
| 109 PR_snprintf(dest, NSID_LENGTH, gIDFormat, | |
| 110 m0, (uint32_t) m1, (uint32_t) m2, | |
| 111 (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2], | |
| 112 (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5], | |
| 113 (uint32_t) m3[6], (uint32_t) m3[7]); | |
| 114 } | |
| 115 | |
| 116 #endif // XPCOM_GLUE_AVOID_NSPR |
