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110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
#define NAPI_VERSION 1
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#include <assert.h>
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#include <string.h>
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#include <node_api.h>
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napi_value IsValidUTF8(napi_env env, napi_callback_info info) {
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napi_status status;
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size_t argc = 1;
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napi_value argv[1];
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status = napi_get_cb_info(env, info, &argc, argv, NULL, NULL);
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assert(status == napi_ok);
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uint8_t *buf;
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size_t len;
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status = napi_get_buffer_info(env, argv[0], (void **)&buf, &len);
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assert(status == napi_ok);
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size_t i = 0;
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//
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// This code has been taken from utf8_check.c which was developed by
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// Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/>.
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//
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// For original code / licensing please refer to
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// https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c
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//
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while (i < len) {
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size_t j = i + 8;
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if (j <= len) {
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//
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// Read 8 bytes and check if they are ASCII.
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//
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uint64_t chunk;
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memcpy(&chunk, buf + i, 8);
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if ((chunk & 0x8080808080808080) == 0x00) {
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i = j;
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continue;
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}
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}
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while ((buf[i] & 0x80) == 0x00) { // 0xxxxxxx
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if (++i == len) {
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goto exit;
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}
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}
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if ((buf[i] & 0xe0) == 0xc0) { // 110xxxxx 10xxxxxx
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if (
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i + 1 == len ||
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(buf[i + 1] & 0xc0) != 0x80 ||
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(buf[i] & 0xfe) == 0xc0 // overlong
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) {
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break;
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}
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i += 2;
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} else if ((buf[i] & 0xf0) == 0xe0) { // 1110xxxx 10xxxxxx 10xxxxxx
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if (
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i + 2 >= len ||
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(buf[i + 1] & 0xc0) != 0x80 ||
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(buf[i + 2] & 0xc0) != 0x80 ||
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(buf[i] == 0xe0 && (buf[i + 1] & 0xe0) == 0x80) || // overlong
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(buf[i] == 0xed && (buf[i + 1] & 0xe0) == 0xa0) // surrogate (U+D800 - U+DFFF)
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) {
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break;
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}
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i += 3;
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} else if ((buf[i] & 0xf8) == 0xf0) { // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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if (
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i + 3 >= len ||
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(buf[i + 1] & 0xc0) != 0x80 ||
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(buf[i + 2] & 0xc0) != 0x80 ||
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(buf[i + 3] & 0xc0) != 0x80 ||
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(buf[i] == 0xf0 && (buf[i + 1] & 0xf0) == 0x80) || // overlong
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(buf[i] == 0xf4 && buf[i + 1] > 0x8f) || buf[i] > 0xf4 // > U+10FFFF
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) {
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break;
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}
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i += 4;
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} else {
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break;
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}
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}
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exit:;
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napi_value result;
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status = napi_get_boolean(env, i == len, &result);
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assert(status == napi_ok);
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return result;
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}
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napi_value Init(napi_env env, napi_value exports) {
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napi_status status;
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napi_value isValidUTF8;
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status = napi_create_function(env, NULL, 0, IsValidUTF8, NULL, &isValidUTF8);
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assert(status == napi_ok);
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return isValidUTF8;
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}
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NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)
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