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use gu_string_buf_data in the Java binding to avoid double copying of strings

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krasimir
2017-04-13 13:21:32 +00:00
parent 9aeb45e1cc
commit e650b9c5fc
3 changed files with 41 additions and 19 deletions
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23
src/runtime/java/jni_utils.c
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@@ -33,6 +33,29 @@ gu2j_string(JNIEnv *env, GuString s) {
return (*env)->NewString(env, utf16, dst-utf16);
}
jstring
gu2j_string_buf(JNIEnv *env, GuStringBuf* sbuf) {
const char* s = gu_string_buf_data(sbuf);
const char* utf8 = s;
size_t len = gu_string_buf_length(sbuf);
jchar* utf16 = alloca(len*sizeof(jchar));
jchar* dst = utf16;
while (s-utf8 < len) {
GuUCS ucs = gu_utf8_decode((const uint8_t**) &s);
if (ucs <= 0xFFFF) {
*dst++ = ucs;
} else {
ucs -= 0x10000;
*dst++ = 0xD800+((ucs >> 10) & 0x3FF);
*dst++ = 0xDC00+(ucs & 0x3FF);
}
}
return (*env)->NewString(env, utf16, dst-utf16);
}
GuString
j2gu_string(JNIEnv *env, jstring s, GuPool* pool) {
GuString str = (*env)->GetStringUTFChars(env, s, 0);