michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsID.h"
michael@0: #include "prprf.h"
michael@0: #include "nsMemory.h"
michael@0: 
michael@0: /**
michael@0:  * Multiplies the_int_var with 16 (0x10) and adds the value of the
michael@0:  * hexadecimal digit the_char. If it fails it returns false from
michael@0:  * the function it's used in.
michael@0:  */
michael@0: 
michael@0: #define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \
michael@0:     the_int_var = (the_int_var << 4) + the_char; \
michael@0:     if(the_char >= '0' && the_char <= '9') the_int_var -= '0'; \
michael@0:     else if(the_char >= 'a' && the_char <= 'f') the_int_var -= 'a'-10; \
michael@0:     else if(the_char >= 'A' && the_char <= 'F') the_int_var -= 'A'-10; \
michael@0:     else return false
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * Parses number_of_chars characters from the char_pointer pointer and
michael@0:  * puts the number in the dest_variable. The pointer is moved to point
michael@0:  * at the first character after the parsed ones. If it fails it returns
michael@0:  * false from the function the macro is used in.
michael@0:  */
michael@0: 
michael@0: #define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \
michael@0:   do { int32_t _i=number_of_chars; \
michael@0:   dest_variable = 0; \
michael@0:   while(_i) { \
michael@0:     ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \
michael@0:     char_pointer++; \
michael@0:     _i--; \
michael@0:   } } while(0)
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * Parses a hyphen from the char_pointer string. If there is no hyphen there
michael@0:  * the function returns false from the function it's used in. The
michael@0:  * char_pointer is advanced one step.
michael@0:  */
michael@0: 
michael@0:  #define PARSE_HYPHEN(char_pointer)   if(*(char_pointer++) != '-') return false
michael@0: 
michael@0: /*
michael@0:  * Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into
michael@0:  * an nsID. It can also handle the old format without the { and }.
michael@0:  */
michael@0: 
michael@0: bool nsID::Parse(const char *aIDStr)
michael@0: {
michael@0:   /* Optimized for speed */
michael@0:   if(!aIDStr) {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   bool expectFormat1 = (aIDStr[0] == '{');
michael@0:   if(expectFormat1) aIDStr++;
michael@0: 
michael@0:   PARSE_CHARS_TO_NUM(aIDStr, m0, 8);
michael@0:   PARSE_HYPHEN(aIDStr);
michael@0:   PARSE_CHARS_TO_NUM(aIDStr, m1, 4);
michael@0:   PARSE_HYPHEN(aIDStr);
michael@0:   PARSE_CHARS_TO_NUM(aIDStr, m2, 4);
michael@0:   PARSE_HYPHEN(aIDStr);
michael@0:   int i;
michael@0:   for(i=0; i<2; i++)
michael@0:     PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
michael@0:   PARSE_HYPHEN(aIDStr);
michael@0:   while(i < 8) {
michael@0:     PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2);
michael@0:     i++;
michael@0:   }
michael@0: 
michael@0:   return expectFormat1 ? *aIDStr == '}' : true;
michael@0: }
michael@0: 
michael@0: #ifndef XPCOM_GLUE_AVOID_NSPR
michael@0: 
michael@0: static const char gIDFormat[] =
michael@0:   "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}";
michael@0: 
michael@0: /*
michael@0:  * Returns an allocated string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
michael@0:  * format. The string is allocated with NS_Alloc and should be freed by
michael@0:  * the caller.
michael@0:  */
michael@0: 
michael@0: char *nsID::ToString() const
michael@0: {
michael@0:   char *res = (char*)NS_Alloc(NSID_LENGTH);
michael@0: 
michael@0:   if (res != nullptr) {
michael@0:     PR_snprintf(res, NSID_LENGTH, gIDFormat,
michael@0:                 m0, (uint32_t) m1, (uint32_t) m2,
michael@0:                 (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2],
michael@0:                 (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5],
michael@0:                 (uint32_t) m3[6], (uint32_t) m3[7]);
michael@0:   }
michael@0:   return res;
michael@0: }
michael@0: 
michael@0: void nsID::ToProvidedString(char (&dest)[NSID_LENGTH]) const 
michael@0: {
michael@0:   PR_snprintf(dest, NSID_LENGTH, gIDFormat,
michael@0:               m0, (uint32_t) m1, (uint32_t) m2,
michael@0:               (uint32_t) m3[0], (uint32_t) m3[1], (uint32_t) m3[2],
michael@0:               (uint32_t) m3[3], (uint32_t) m3[4], (uint32_t) m3[5],
michael@0:               (uint32_t) m3[6], (uint32_t) m3[7]);
michael@0: }
michael@0: 
michael@0: #endif // XPCOM_GLUE_AVOID_NSPR