package com.imyeyu.font.icon.ttf;

import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;

/// TrueType 大端字节缓冲区
///
/// @author Codex
/// @since 2026-07-13 16:26
final class FontBuffer {

	private final ByteArrayOutputStream out = new ByteArrayOutputStream();

	void u8(int value) {
		out.write(value & 0xFF);
	}

	void i16(int value) {
		u16(value);
	}

	void u16(int value) {
		out.write((value >>> 8) & 0xFF);
		out.write(value & 0xFF);
	}

	void u32(long value) {
		out.write((int) ((value >>> 24) & 0xFF));
		out.write((int) ((value >>> 16) & 0xFF));
		out.write((int) ((value >>> 8) & 0xFF));
		out.write((int) (value & 0xFF));
	}

	void u64(long value) {
		u32(value >>> 32);
		u32(value);
	}

	void tag(String tag) {
		byte[] bytes = tag.getBytes(StandardCharsets.US_ASCII);
		for (int i = 0; i < 4; i++) {
			u8(i < bytes.length ? bytes[i] : 32);
		}
	}

	void bytes(byte[] bytes) {
		out.writeBytes(bytes);
	}

	void pad4() {
		while (out.size() % 4 != 0) {
			u8(0);
		}
	}

	int length() {
		return out.size();
	}

	byte[] bytes() {
		return out.toByteArray();
	}
}