How to convert string in url encoding to html encoding?

Printable View

11-05-2011
Jerel2k11

How to convert string in url encoding to html encoding?

Hello, I am using a testing tool that uses C code and it has a function which will convert from HTML to URL or PLAIN but not URL to HTML. Does anyone have any code which would convert the following

Code:

"3%2635%3Dsaptest15001%2C8P%26S5%2C88%2663%3DsecEnterprise%2C8P%264F%3D462265%2C8P%264E%3D642037JfUyOifEckq6pX62%2C8P%26pa%2C8P%26Tm%3D3650%2C83%261%2C8P%262r%3Dcgar-bobjqapp2%3A6400%2C8P%26Tn%3D{3%26.2%3D{3%26O%3DPersonalCategory%2C0P%262%3D462327%2C03}%2C2z%26.1%3D{3%26O%3DFavoritesFolder%2C0P%262%3D462326%2C03}%2C2z%26.3%3D{3%26O%3DInbox%2C0P%262%3D462328%2C03}%2C2z%26U%3D3%2C03}%2C%3Fz%263k%3D%40BOBJ_QA%2C8P%265U%3D642038JhpJ4sSqGXzP9rYn642037JfUyOifEckq6pX62%2C8P" to "3&35=saptest15001,8P&S5,88&63=secEnterprise,8P&4F=462265,8P&4E=642037JfUyOifEckq6pX62,8P&pa,8P&Tm=3650,83&1,8P&2r=cgar-bobjqapp2:6400,8P&Tn={3&.2={3&O=PersonalCategory,0P&2=462327,03},2z&.1={3&O=FavoritesFolder,0P&2=462326,03},2z&.3={3&O=Inbox,0P&2=462328,03},2z&U=3,03},?z&3k=@BOBJ_QA,8P&5U=642038JhpJ4sSqGXzP9rYn642037JfUyOifEckq6pX62,8P"

I've run out of ideas on how to accomplish this task. I would like to be able to reuse the code in the future as I am sure I will see this need again.
11-05-2011
BillyTKid

Its very easy with string functions like:

Code:

void transformed(char *s) { char *ent[]={"&","<",">","""," "}, *pre="&<>\" ", c[2]={0}; int x; while( *s ) if( sscanf(s,"%%%02x",&x) ) s+=3,printf("%s",strchr(pre,x)?ent[strchr(pre,x)-pre]:(*c=x,c)); else putchar(*s++); } transformed("3%2635%3Dsaptest15001%2C8P%26S5%2C88%2663%3DsecEnterprise%2C8P...");

To change the code to put in a string and not to stdout is your work. :)
11-05-2011
Jerel2k11

First, thank you for the reply. I am always willing to learn but I am not understanding the logic. To convert 3%2635%3Dsaptest15001%2C8P%26S5%2C88%2663%3DsecEnt erprise%2C8P to 3&35=saptest15001,8P&S5,88&63=secEnter prise,8P how do you do that? It appears your code is going the other way as "transformed" is what I am converting from. Thx.
11-05-2011
MK27

Nb. There should be no space between & and # in the entities below!
But vBulletin does not escape them even inside code tags...

HTML will also accept decimal codes, eg, & is equivalent to & #38; The number here corresponds to the ASCII value of the character.

URL encodings also correspond to ASCII values, except they are in hexidecimal. So:

'&' = ASCII decimal 38, hexadecimal 26.
& #38 is an HTML entity for &.
%26 is the URL encoding for &.

If you apply that, it's easy to come up with functions that translate the entire range of restricted characters ;) Eg, here's one I've used for turning URLS to plain text:

Code:

int URIdecode (char *str, char *copy) { int len = strlen(str), i, j = 0; char hex[3] = {0}; for (i = 0; i < len; i++) { if (str[i] == '%' && i < len-2) { i++; strncpy(hex, &str[i++], 2); copy[j] = strtol(hex, NULL, 16); } else if (str[i] == '+') copy[j] = ' '; else copy[j] = str[i]; j++; } copy[j] = '\0'; return j; }

Tweak that a bit and it will put out (numerical) HTML entities instead.
11-05-2011
Jerel2k11

This is code I was working on trying to get S_Cookie1 to convert to S_CORRECT. I was going through each URL encoded and trying to convert to HTML but was overwriting itself and the code was choking the compiler.

Code:

lr_save_string("3%2635%3Dsaptest15001%2C8P%26S5%2C88%2663%3DsecEnterprise%2C8P%264F%3D462265%2C8P%264E%3D642037JfUyOifEckq6pX62%2C8P%26pa%2C8P%26Tm%3D3650%2C83%261%2C8P%262r%3Dcgar-bobjqapp2%3A6400%2C8P%26Tn%3D%7B3%26.2%3D%7B3%26O%3DPersonalCategory%2C0P%262%3D462327%2C03%7D%2C2z%26.1%3D%7B3%26O%3DFavoritesFolder%2C0P%262%3D462326%2C03%7D%2C2z%26.3%3D%7B3%26O%3DInbox%2C0P%262%3D462328%2C03%7D%2C2z%26U%3D3%2C03%7D%2C%3Fz%263k%3D%40BOBJ_QA%2C8P%265U%3D642038JhpJ4sSqGXzP9rYn642037JfUyOifEckq6pX62%2C8P","S_Cookie1"); lr_save_string("3&35=saptest15001,8P&S5,88&63=secEnterprise,8P&4F=462265,8P&4E=642037JfUyOifEckq6pX62,8P&pa,8P&Tm=3650,83&1,8P&2r=cgar-bobjqapp2:6400,8P&Tn={3&.2={3&O=PersonalCategory,0P&2=462327,03},2z&.1={3&O=FavoritesFolder,0P&2=462326,03},2z&.3={3&O=Inbox,0P&2=462328,03},2z&U=3,03},?z&3k=@BOBJ_QA,8P&5U=642038JhpJ4sSqGXzP9rYn642037JfUyOifEckq6pX62,8P","S_CORRECT"); sprintf(c_workSpaceBefore,"%s",lr_eval_string("{S_Cookie1}")); f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%26","&"); /* replaces %26 with & */ //strrepl(c_workSpaceAfter,c_workSpaceBefore,"%26","&"); lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%2C",","); /* replaces %2C with , */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"%2C",","); lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%3D","="); /* replaces %3D with = */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"%3D","="); lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%40","@"); /* replaces %40 with @ */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"+","%2b"); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%3A",":"); /* replaces %3A with : */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"+","%2b"); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%7B","{"); /* replaces %7B with { */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"+","%2b"); sprintf(c_workSpaceBefore,"%s", c_workSpaceAfter); // avoid overwrite workspaceafter lr_error_message("c_workSpaceAfter %s", c_workSpaceAfter); lr_error_message("c_workSpaceBefore %s", c_workSpaceBefore); //f_STR_replaceSubString(c_workSpaceAfter,c_workSpaceBefore,"%7D","}"); /* replaces %7D with } */ strrepl(c_workSpaceAfter,c_workSpaceBefore,"+","%2b"); lr_save_string(c_workSpaceAfter,"S_Cookie1_html"); lr_error_message("S_Cookie1_html %s", lr_eval_string("{S_Cookie1_html}")); lr_error_message("S_CORRECT %s", lr_eval_string("{S_CORRECT}"));
11-05-2011
MK27

Quote:

Originally Posted by Jerel2k11

This is code I was working on trying to get S_Cookie1 to convert to S_CORRECT. I was going through each URL encoded and trying to convert to HTML but was overwriting itself and the code was choking the compiler.

That is a very awkward way to do it IMO.

I had to re-edit my last post because of a vBulletin glitch with numerical entities, so maybe you want to re-read that now it is fixed. The point is, it is easiest to work with ASCII values in encoding URLS and HTML, rather than treating every single possibility as a special case.

Of course, the fact that HTML also uses labels for some entities makes decoding more awkward (you need a few special cases), but that is not an issue with URL-encoding.
11-06-2011
Jerel2k11

MK27 I understand your comments however my concern is the conversion that I am after needs to be passed back to the server in the S_CORRECT format. It gets passed back in a SOAP envelope. I also agree with you that the method we were trying to get working is awkward but we were grasping at straws trying to come up with something. Can't remember if I mentioned this but our test tool has a function that will convert from HTML to URL or HTML to PLAIN but not the other way around. This code would get used in a test script so I would have to account for any delay in this process of conversion.