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uri.c
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uri.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "ant.h"
#include "errors.h"
#include "runtime.h"
#include "utf8.h"
#include "modules/uri.h"
static const unsigned char uri_unreserved[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,1,0,0,0,0,0,1,1,1,1,0,0,1,1,0,
1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
static const unsigned char uri_reserved[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,1,1,0,1,0,0,0,0,1,1,0,0,1,
0,0,0,0,0,0,0,0,0,0,1,1,0,1,0,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
#define is_uri_unreserved(c) (uri_unreserved[(unsigned char)(c)])
#define is_uri_reserved(c) (uri_reserved[(unsigned char)(c)])
static int is_valid_continuation(unsigned char c) {
return (c & 0xC0) == 0x80;
}
static int hex_digit(char c) {
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
return -1;
}
static int is_lone_surrogate(const unsigned char *str, int seq_len) {
if (seq_len != 3) return 0;
if (str[0] != 0xED) return 0;
return (str[1] >= 0xA0 && str[1] <= 0xBF);
}
static int decode_escape_sequence(const char *str, size_t len, size_t *pos, unsigned char *out_byte) {
if (*pos + 2 >= len) return -1;
if (str[*pos] != '%') return -1;
int high = hex_digit(str[*pos + 1]);
int low = hex_digit(str[*pos + 2]);
if (high < 0 || low < 0) return -1;
*out_byte = (unsigned char)((high << 4) | low);
*pos += 3;
return 0;
}
// encodeURIComponent()
static jsval_t js_encodeURIComponent(struct js *js, jsval_t *args, int nargs) {
jsval_t result;
char *out = NULL;
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "", 0);
size_t len = strlen(str);
size_t out_cap = len * 12 + 1;
out = malloc(out_cap);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
size_t i = 0;
while (i < len) {
unsigned char c = (unsigned char)str[i];
if (is_uri_unreserved(c)) {
out[out_len++] = (char)c;
i++;
continue;
}
int seq_len = utf8_sequence_length(c);
if (seq_len < 0) goto malformed;
if (i + seq_len > len) goto malformed;
for (int j = 1; j < seq_len; j++) {
if (!is_valid_continuation((unsigned char)str[i + j])) goto malformed;
}
if (is_lone_surrogate((unsigned char *)&str[i], seq_len)) goto malformed;
for (int j = 0; j < seq_len; j++) {
out_len += (size_t)snprintf(out + out_len, out_cap - out_len, "%%%02X", (unsigned char)str[i + j]);
}
i += seq_len;
}
out[out_len] = '\0';
result = js_mkstr(js, out, out_len);
free(out);
return result;
malformed:
free(out);
return js_mkerr_typed(js, JS_ERR_URI, "URI malformed");
}
// encodeURI()
static jsval_t js_encodeURI(struct js *js, jsval_t *args, int nargs) {
jsval_t result;
char *out = NULL;
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "", 0);
size_t len = strlen(str);
size_t out_cap = len * 12 + 1;
out = malloc(out_cap);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
size_t i = 0;
while (i < len) {
unsigned char c = (unsigned char)str[i];
if (is_uri_unreserved(c) || is_uri_reserved(c)) {
out[out_len++] = (char)c;
i++;
continue;
}
int seq_len = utf8_sequence_length(c);
if (seq_len < 0) goto malformed;
if (i + seq_len > len) goto malformed;
for (int j = 1; j < seq_len; j++) {
if (!is_valid_continuation((unsigned char)str[i + j])) goto malformed;
}
if (is_lone_surrogate((unsigned char *)&str[i], seq_len)) goto malformed;
for (int j = 0; j < seq_len; j++) {
out_len += (size_t)snprintf(out + out_len, out_cap - out_len, "%%%02X", (unsigned char)str[i + j]);
}
i += seq_len;
}
out[out_len] = '\0';
result = js_mkstr(js, out, out_len);
free(out);
return result;
malformed:
free(out);
return js_mkerr_typed(js, JS_ERR_URI, "URI malformed");
}
// decodeURIComponent()
static jsval_t js_decodeURIComponent(struct js *js, jsval_t *args, int nargs) {
jsval_t result;
char *out = NULL;
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "", 0);
size_t len = strlen(str);
out = malloc(len + 1);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
size_t i = 0;
while (i < len) {
if (str[i] != '%') {
out[out_len++] = str[i++];
continue;
}
unsigned char first_byte;
if (decode_escape_sequence(str, len, &i, &first_byte) < 0) goto malformed;
int seq_len = utf8_sequence_length(first_byte);
if (seq_len < 0) goto malformed;
out[out_len++] = (char)first_byte;
for (int j = 1; j < seq_len; j++) {
unsigned char cont_byte;
if (decode_escape_sequence(str, len, &i, &cont_byte) < 0) goto malformed;
if (!is_valid_continuation(cont_byte)) goto malformed;
out[out_len++] = (char)cont_byte;
}
}
out[out_len] = '\0';
result = js_mkstr(js, out, out_len);
free(out);
return result;
malformed:
free(out);
return js_mkerr_typed(js, JS_ERR_URI, "URI malformed");
}
// decodeURI()
static jsval_t js_decodeURI(struct js *js, jsval_t *args, int nargs) {
jsval_t result;
char *out = NULL;
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "", 0);
size_t len = strlen(str);
out = malloc(len + 1);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
size_t i = 0;
while (i < len) {
if (str[i] != '%') {
out[out_len++] = str[i++];
continue;
}
if (i + 2 >= len) goto malformed;
int high = hex_digit(str[i + 1]);
int low = hex_digit(str[i + 2]);
if (high < 0 || low < 0) goto malformed;
unsigned char first_byte = (unsigned char)((high << 4) | low);
if (first_byte < 128 && is_uri_reserved((char)first_byte)) {
out[out_len++] = str[i++];
out[out_len++] = str[i++];
out[out_len++] = str[i++];
continue;
}
i += 3;
int seq_len = utf8_sequence_length(first_byte);
if (seq_len < 0) goto malformed;
out[out_len++] = (char)first_byte;
for (int j = 1; j < seq_len; j++) {
unsigned char cont_byte;
if (decode_escape_sequence(str, len, &i, &cont_byte) < 0) goto malformed;
if (!is_valid_continuation(cont_byte)) goto malformed;
out[out_len++] = (char)cont_byte;
}
}
out[out_len] = '\0';
result = js_mkstr(js, out, out_len);
free(out);
return result;
malformed:
free(out);
return js_mkerr_typed(js, JS_ERR_URI, "URI malformed");
}
static int is_escape_unreserved(unsigned char c) {
return (c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') ||
c == '@' || c == '*' || c == '_' || c == '+' ||
c == '-' || c == '.' || c == '/';
}
static jsval_t js_escape(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "undefined", 9);
size_t len = strlen(str);
size_t out_cap = len * 6 + 1;
char *out = malloc(out_cap);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
for (size_t i = 0; i < len; i++) {
unsigned char c = (unsigned char)str[i];
if (is_escape_unreserved(c)) {
out[out_len++] = (char)c;
} else out_len += (size_t)snprintf(out + out_len, out_cap - out_len, "%%%02X", c);
}
out[out_len] = '\0';
jsval_t result = js_mkstr(js, out, out_len);
free(out);
return result;
}
static jsval_t js_unescape(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) return js_mkstr(js, "undefined", 9);
char *str = js_getstr(js, args[0], NULL);
if (!str) return js_mkstr(js, "undefined", 9);
size_t len = strlen(str);
char *out = malloc(len + 1);
if (!out) return js_mkerr(js, "out of memory");
size_t out_len = 0;
size_t i = 0;
while (i < len) {
if (str[i] == '%' && i + 2 < len) {
int high = hex_digit(str[i + 1]);
int low = hex_digit(str[i + 2]);
if (high >= 0 && low >= 0) {
out[out_len++] = (char)((high << 4) | low);
i += 3;
continue;
}
}
out[out_len++] = str[i++];
}
out[out_len] = '\0';
jsval_t result = js_mkstr(js, out, out_len);
free(out);
return result;
}
void init_uri_module(void) {
struct js *js = rt->js;
jsval_t glob = js_glob(js);
js_set(js, glob, "encodeURI", js_mkfun(js_encodeURI));
js_set(js, glob, "encodeURIComponent", js_mkfun(js_encodeURIComponent));
js_set(js, glob, "decodeURI", js_mkfun(js_decodeURI));
js_set(js, glob, "decodeURIComponent", js_mkfun(js_decodeURIComponent));
js_set(js, glob, "escape", js_mkfun(js_escape));
js_set(js, glob, "unescape", js_mkfun(js_unescape));
}

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