nhottanscp Reporter
	Description • 25 years ago

7 bit check mail body is used to relabel charset and transfer encoding as 
us-ascii, 7bit when the main body only contains characters in us-ascii range.
Currently, the function is used which converts data to unicode and check each 
character if greater than 127.
The code below was provided by ftang which does not do the unicode conversion 
but check charset specific marks (e.g. escape 0x1B).

PRBool ContainOnlyAscii(const char* charset, const char* data, PRInt32 size) 
{ 
    if( strncmp(charset, "ISO-2022", 8) == 0) { // ISO-2022-JP, ISO-2022-CN, 
ISO-2022-KR 
        for(char* p = data, PRInt32 i=0; i < size; i++, p++) { 
            if( 0x1b == *p) // searching for ESC 
                return PR_FALSE; 
       } 
    } else if( strcmp(charset, "HZ-GB-2312") == 0) { 
        for(char* p = data, PRInt32 i=0; i < size-1; i++, p++) 
            if(( '~' == *p) && ( '{' == *(p+1))) // searching for ~{ 
                return PR_FALSE; 
   } else { 
        for(char* p = data, PRInt32 i=0; i < size; i++, p++) 
            if( 0x80 & *p) // searching for 8 bits data 
                return PR_FALSE; 
  } 
  return PR_TRUE; 
}

	Katsuhiko Momoi
	Comment 1 • 24 years ago

QA contact to ji.