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/* swfcgi.c
Parse CGI parameters
Partly adopted from Steven Grimm's uncgi tool and library.
Extension module for the rfxswf library.
Part of the swftools package.
Copyright (c) 2001 Rainer Böhme <rfxswf@reflex-studio.de>
This file is distributed under the GPL, see file COPYING for details
*/
#define ishex(x) (((x) >= '0' && (x) <= '9') || ((x) >= 'a' && (x) <= 'f') || ((x) >= 'A' && (x) <= 'F'))
#define PREFIX "WWW_"
static int swf_htoi(unsigned char * s)
{ int value;
char c;
c = s[0];
if (isupper(c)) c = tolower(c);
value = (c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10) * 16;
c = s[1];
if (isupper(c)) c = tolower(c);
value += c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10;
return (value);
}
static void swf_url_unescape(unsigned char * s)
{ unsigned char *dest = s;
while (s[0])
{ if (s[0] == '+') dest[0] = ' ';
else
{ if (s[0] == '%' && ishex(s[1]) && ishex(s[2]))
{ dest[0] = (unsigned char) swf_htoi(s + 1);
s += 2;
}
else dest[0] = s[0];
}
s++;dest++;
}
dest[0] = 0;
}
static void swf_cgienv(unsigned char * var)
{ unsigned char *buf, *c, *s, *t, *oldval = NULL, *newval;
int despace = 0, got_cr = 0;
// fprintf(stderr,"%s\n",var);
swf_url_unescape(var);
// fprintf(stderr,"%s\n",var);
buf = (unsigned char*)malloc(strlen(var) + sizeof(PREFIX) + 2);
if (!buf) return;
strcpy(buf, PREFIX);
if (var[0] == '_')
{ strcpy(&buf[sizeof(PREFIX)-1], &var[1]);
despace = 1;
}
else strcpy(&buf[sizeof(PREFIX)-1], var);
for (c = buf; c[0] ; c++)
{ if (c[0] == '.') c[0] = '_';
if (c[0] == '=') break;
}
if (!c[0]) c[1] = 0;
c[0] = 0;
if (despace && c[1])
{ for (s = c+1; s[0] && isspace(s[0]); s++);
t = c + 1;
while (s[0])
{ if (s[0] == '\r')
{ got_cr = 1;
s++;
continue;
}
if (got_cr)
{ if (s[0] != '\n')
*t++ = '\n';
got_cr = 0;
}
*t++ = *s++;
}
while (t > c && isspace(*--t));
t[1] = 0;
}
if ((oldval = getenv(buf)))
{ newval = (unsigned char*)malloc(strlen(oldval) + strlen(buf) + strlen(&c[1]) + 3);
if (!newval) return;
c[0] = '=';
sprintf(newval, "%s#%s", buf, oldval);
c[0] = 0;
oldval -= strlen(buf) + 1; // skip past VAR=
}
else
{ c[0] = '=';
newval = buf;
}
putenv(newval);
if (oldval)
{ free(oldval);
free(buf);
}
}
static void swf_scanquery(char * q)
{ char *next = q;
if (!q) return;
while (next)
{ next = strchr(q, '&');
if (next) next[0] = 0;
swf_cgienv(q);
if (next)
{ next[0] = '&';
q = next+1;
}
}
}
char * swf_postread()
{ char * buf = NULL;
int size = 0, sofar = 0, got;
buf = getenv("CONTENT_TYPE");
if ((!buf) || strcmp(buf, "application/x-www-form-urlencoded")) return NULL;
buf = getenv("CONTENT_LENGTH");
if (!buf) return NULL;
size = atoi(buf);
buf = (unsigned char*)malloc(size + 1);
if (buf)
{ do
{ got = fread(buf + sofar, 1, size - sofar, stdin);
sofar += got;
} while (got && sofar < size);
buf[sofar] = 0;
}
return buf;
}
void swf_uncgi()
{ char *query, *dupquery, *method;
query = getenv("QUERY_STRING");
if ((query) && strlen(query))
{ dupquery = strdup(query);
swf_scanquery(dupquery);
free(dupquery);
}
method = getenv("REQUEST_METHOD");
if ((method) && ! strcmp(method, "POST"))
{ query = swf_postread();
if ((query)&&(query[0]!=0)) swf_scanquery(query);
free(query);
}
}
#undef ishex
#undef PREFIX
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