92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
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#include "urlenc.hpp"
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static int hexdig(int v)
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{
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v &= 0x0f;
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return v <= 9 ? v + '0' : v + 'A' - 10;
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}
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static const char *percent_enc_char(int c)
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{
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static char res[4] = "%..";
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res[1] = hexdig(c >> 4);
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res[2] = hexdig(c);
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return res;
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}
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static int hexdigvalue(int c)
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{
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if(c >= '0' && c <= '9')
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return c - '0';
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if(c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if(c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -1;
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}
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ScriptVariable url_encode(const ScriptVariable &plain_sv)
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{
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ScriptVariable res;
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const char *plain = plain_sv.c_str();
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for(; *plain; plain++) {
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if(*plain == ' ') {
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res += '+';
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} else
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if((*plain >= 'A' && *plain <= 'Z') ||
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(*plain >= 'a' && *plain <= 'z') ||
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(*plain >= '0' && *plain <= '9') ||
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*plain == '-' || *plain == '_' || *plain == '~' || *plain == '.')
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{
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res += *plain;
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} else {
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res += percent_enc_char(*plain);
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}
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}
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return res;
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}
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static const char *decoded_byte(const char *enc)
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{
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static char buf[4] = "\0\0\0";
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int dig1 = hexdigvalue(*enc);
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int dig2 = hexdigvalue(enc[1]);
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if(dig1 == -1 || dig2 == -1) {
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buf[0] = '%';
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buf[1] = *enc;
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buf[2] = enc[1]; // NB: buf[3] never changes
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} else {
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buf[0] = (dig2 & 0x0f) | ((dig1 << 4) & 0xf0);
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buf[1] = 0;
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}
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return buf;
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}
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ScriptVariable url_decode(const ScriptVariable &encoded_sv)
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{
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ScriptVariable res;
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const char *encoded = encoded_sv.c_str();
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while(*encoded) {
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if(*encoded == '+') {
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res += ' ';
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encoded++;
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} else
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if(*encoded == '%') {
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if(encoded[1] && encoded[2]) {
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res += decoded_byte(encoded+1);
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encoded += 3;
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} else {
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// unexpected end of line; leave %_ as is
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res += encoded;
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break;
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}
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} else {
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res += *encoded;
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encoded++;
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}
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}
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return res;
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}
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