textcodec.c
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textcodec.c
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	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>

	#include "runtime.h"
	#include "modules/textcodec.h"
	#include "modules/buffer.h"
	#include "modules/symbol.h"

	// TextEncoder.prototype.encode(string)
	static jsval_t js_textencoder_encode(struct js js, jsval_t args, int nargs) {
	size_t str_len = 0;
	const char *str = "";

	if (nargs > 0 && js_type(args[0]) == JS_STR) {
	str = js_getstr(js, args[0], &str_len);
	if (!str) {
	str = "";
	str_len = 0;
	}
	}

	jsval_t glob = js_glob(js);
	jsval_t uint8array_ctor = js_get(js, glob, "Uint8Array");

	jsval_t len_arg = js_mknum((double)str_len);
	jsval_t arr = js_call(js, uint8array_ctor, &len_arg, 1);

	if (js_type(arr) == JS_ERR) return arr;

	if (str_len > 0) {
	jsval_t ta_data_val = js_get_slot(js, arr, SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (ta_data && ta_data->buffer && ta_data->buffer->data) memcpy(ta_data->buffer->data, str, str_len);
	}

	return arr;
	}

	// TextEncoder.prototype.encodeInto(string, uint8array)
	static jsval_t js_textencoder_encodeInto(struct js js, jsval_t args, int nargs) {
	if (nargs < 2) {
	return js_mkerr(js, "encodeInto requires string and Uint8Array arguments");
	}

	size_t str_len = 0;
	const char *str = "";

	if (js_type(args[0]) == JS_STR) {
	str = js_getstr(js, args[0], &str_len);
	if (!str) {
	str = "";
	str_len = 0;
	}
	}

	jsval_t ta_data_val = js_get_slot(js, args[1], SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (!ta_data) return js_mkerr(js, "Second argument must be a Uint8Array");

	size_t available = ta_data->byte_length;
	size_t to_write = str_len < available ? str_len : available;

	if (to_write > 0) {
	memcpy(ta_data->buffer->data + ta_data->byte_offset, str, to_write);
	}

	jsval_t result = js_mkobj(js);
	js_set(js, result, "read", js_mknum((double)to_write));
	js_set(js, result, "written", js_mknum((double)to_write));

	return result;
	}

	static jsval_t js_textencoder_constructor(struct js js, jsval_t args, int nargs) {
	(void)args;
	(void)nargs;

	jsval_t obj = js_mkobj(js);
	js_set(js, obj, "encoding", js_mkstr(js, "utf-8", 5));
	js_set(js, obj, "encode", js_mkfun(js_textencoder_encode));
	js_set(js, obj, "encodeInto", js_mkfun(js_textencoder_encodeInto));
	js_set(js, obj, get_toStringTag_sym_key(), js_mkstr(js, "TextEncoder", 11));

	return obj;
	}

	// TextDecoder.prototype.decode(bufferSource)
	static jsval_t js_textdecoder_decode(struct js js, jsval_t args, int nargs) {
	if (nargs < 1) {
	return js_mkstr(js, "", 0);
	}

	jsval_t ta_data_val = js_get_slot(js, args[0], SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (ta_data) {
	if (!ta_data->buffer) return js_mkstr(js, "", 0);
	uint8_t *data = ta_data->buffer->data + ta_data->byte_offset;
	size_t len = ta_data->byte_length;
	return js_mkstr(js, (const char *)data, len);
	}

	jsval_t ab_data_val = js_get_slot(js, args[0], SLOT_BUFFER);
	if (js_type(ab_data_val) == JS_NUM) {
	ArrayBufferData ab_data = (ArrayBufferData )(uintptr_t)js_getnum(ab_data_val);
	if (!ab_data \|\| !ab_data->data) return js_mkstr(js, "", 0);
	return js_mkstr(js, (const char *)ab_data->data, ab_data->length);
	}

	return js_mkstr(js, "", 0);
	}

	static jsval_t js_textdecoder_constructor(struct js js, jsval_t args, int nargs) {
	const char *encoding = "utf-8";
	size_t encoding_len = 5;

	if (nargs > 0 && js_type(args[0]) == JS_STR) {
	encoding = js_getstr(js, args[0], &encoding_len);
	if (encoding && (
	strcasecmp(encoding, "utf-8") == 0 \|\|
	strcasecmp(encoding, "utf8") == 0)
	) { encoding = "utf-8"; encoding_len = 5; }
	}

	jsval_t obj = js_mkobj(js);
	js_set(js, obj, "encoding", js_mkstr(js, encoding, encoding_len));
	js_set(js, obj, "fatal", js_mkfalse());
	js_set(js, obj, "ignoreBOM", js_mkfalse());
	js_set(js, obj, "decode", js_mkfun(js_textdecoder_decode));
	js_set(js, obj, get_toStringTag_sym_key(), js_mkstr(js, "TextDecoder", 11));

	return obj;
	}

	void init_textcodec_module(void) {
	struct js *js = rt->js;
	jsval_t glob = js_glob(js);

	jsval_t textencoder_constructor = js_mkfun(js_textencoder_constructor);
	jsval_t textencoder_proto = js_mkobj(js);

	js_set(js, textencoder_proto, "encode", js_mkfun(js_textencoder_encode));
	js_set(js, textencoder_proto, "encodeInto", js_mkfun(js_textencoder_encodeInto));
	js_set(js, textencoder_proto, "encoding", js_mkstr(js, "utf-8", 5));
	js_set(js, textencoder_constructor, "prototype", textencoder_proto);
	js_set(js, glob, "TextEncoder", textencoder_constructor);

	jsval_t textdecoder_constructor = js_mkfun(js_textdecoder_constructor);
	jsval_t textdecoder_proto = js_mkobj(js);

	js_set(js, textdecoder_proto, "decode", js_mkfun(js_textdecoder_decode));
	js_set(js, textdecoder_proto, "encoding", js_mkstr(js, "utf-8", 5));
	js_set(js, textdecoder_proto, "fatal", js_mkfalse());
	js_set(js, textdecoder_proto, "ignoreBOM", js_mkfalse());
	js_set(js, textdecoder_constructor, "prototype", textdecoder_proto);
	js_set(js, glob, "TextDecoder", textdecoder_constructor);
	}

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