diff options
Diffstat (limited to '')
| -rw-r--r-- | xpcom/base/nsID.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/xpcom/base/nsID.cpp b/xpcom/base/nsID.cpp new file mode 100644 index 0000000000..96fd6daf53 --- /dev/null +++ b/xpcom/base/nsID.cpp @@ -0,0 +1,129 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsID.h" +#include "nsMemory.h" +#include "mozilla/Sprintf.h" + +void nsID::Clear() { + m0 = 0; + m1 = 0; + m2 = 0; + memset(m3, 0, sizeof(m3)); +} + +/** + * Multiplies the_int_var with 16 (0x10) and adds the value of the + * hexadecimal digit the_char. If it fails it returns false from + * the function it's used in. + */ + +#define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \ + the_int_var = (the_int_var << 4) + the_char; \ + if (the_char >= '0' && the_char <= '9') \ + the_int_var -= '0'; \ + else if (the_char >= 'a' && the_char <= 'f') \ + the_int_var -= 'a' - 10; \ + else if (the_char >= 'A' && the_char <= 'F') \ + the_int_var -= 'A' - 10; \ + else \ + return false + +/** + * Parses number_of_chars characters from the char_pointer pointer and + * puts the number in the dest_variable. The pointer is moved to point + * at the first character after the parsed ones. If it fails it returns + * false from the function the macro is used in. + */ + +#define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \ + do { \ + int32_t _i = number_of_chars; \ + dest_variable = 0; \ + while (_i) { \ + ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \ + char_pointer++; \ + _i--; \ + } \ + } while (0) + +/** + * Parses a hyphen from the char_pointer string. If there is no hyphen there + * the function returns false from the function it's used in. The + * char_pointer is advanced one step. + */ + +#define PARSE_HYPHEN(char_pointer) \ + if (*(char_pointer++) != '-') return false + +/* + * Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into + * an nsID. It can also handle the old format without the { and }. + */ + +bool nsID::Parse(const char* aIDStr) { + /* Optimized for speed */ + if (!aIDStr) { + return false; + } + + bool expectFormat1 = (aIDStr[0] == '{'); + if (expectFormat1) { + ++aIDStr; + } + + PARSE_CHARS_TO_NUM(aIDStr, m0, 8); + PARSE_HYPHEN(aIDStr); + PARSE_CHARS_TO_NUM(aIDStr, m1, 4); + PARSE_HYPHEN(aIDStr); + PARSE_CHARS_TO_NUM(aIDStr, m2, 4); + PARSE_HYPHEN(aIDStr); + int i; + for (i = 0; i < 2; ++i) { + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); + } + PARSE_HYPHEN(aIDStr); + while (i < 8) { + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); + i++; + } + + return expectFormat1 ? *aIDStr == '}' : true; +} + +#ifndef XPCOM_GLUE_AVOID_NSPR + +static const char gIDFormat[] = + "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}"; + +/* + * Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} + * format. The string is allocated with moz_xmalloc and should be freed by + * the caller. + */ + +char* nsID::ToString() const { + char* res = (char*)moz_xmalloc(NSID_LENGTH); + snprintf(res, NSID_LENGTH, gIDFormat, m0, (uint32_t)m1, (uint32_t)m2, + (uint32_t)m3[0], (uint32_t)m3[1], (uint32_t)m3[2], (uint32_t)m3[3], + (uint32_t)m3[4], (uint32_t)m3[5], (uint32_t)m3[6], (uint32_t)m3[7]); + return res; +} + +void nsID::ToProvidedString(char (&aDest)[NSID_LENGTH]) const { + SprintfLiteral(aDest, gIDFormat, m0, (uint32_t)m1, (uint32_t)m2, + (uint32_t)m3[0], (uint32_t)m3[1], (uint32_t)m3[2], + (uint32_t)m3[3], (uint32_t)m3[4], (uint32_t)m3[5], + (uint32_t)m3[6], (uint32_t)m3[7]); +} + +#endif // XPCOM_GLUE_AVOID_NSPR + +nsID* nsID::Clone() const { + auto id = static_cast<nsID*>(moz_xmalloc(sizeof(nsID))); + *id = *this; + return id; +} |