@pixi-spine/base/lib/core/BinaryInput.mjs

Base of pixi-spine integration, common files for spine runtimes of different versions

class BinaryInput {
  constructor(data, strings = new Array(), index = 0, buffer = new DataView(data.buffer)) {
    this.strings = strings;
    this.index = index;
    this.buffer = buffer;
  }
  readByte() {
    return this.buffer.getInt8(this.index++);
  }
  readUnsignedByte() {
    return this.buffer.getUint8(this.index++);
  }
  readShort() {
    const value = this.buffer.getInt16(this.index);
    this.index += 2;
    return value;
  }
  readInt32() {
    const value = this.buffer.getInt32(this.index);
    this.index += 4;
    return value;
  }
  readInt(optimizePositive) {
    let b = this.readByte();
    let result = b & 127;
    if ((b & 128) != 0) {
      b = this.readByte();
      result |= (b & 127) << 7;
      if ((b & 128) != 0) {
        b = this.readByte();
        result |= (b & 127) << 14;
        if ((b & 128) != 0) {
          b = this.readByte();
          result |= (b & 127) << 21;
          if ((b & 128) != 0) {
            b = this.readByte();
            result |= (b & 127) << 28;
          }
        }
      }
    }
    return optimizePositive ? result : result >>> 1 ^ -(result & 1);
  }
  readStringRef() {
    const index = this.readInt(true);
    return index == 0 ? null : this.strings[index - 1];
  }
  readString() {
    let byteCount = this.readInt(true);
    switch (byteCount) {
      case 0:
        return null;
      case 1:
        return "";
    }
    byteCount--;
    let chars = "";
    for (let i = 0; i < byteCount; ) {
      const b = this.readUnsignedByte();
      switch (b >> 4) {
        case 12:
        case 13:
          chars += String.fromCharCode((b & 31) << 6 | this.readByte() & 63);
          i += 2;
          break;
        case 14:
          chars += String.fromCharCode((b & 15) << 12 | (this.readByte() & 63) << 6 | this.readByte() & 63);
          i += 3;
          break;
        default:
          chars += String.fromCharCode(b);
          i++;
      }
    }
    return chars;
  }
  readFloat() {
    const value = this.buffer.getFloat32(this.index);
    this.index += 4;
    return value;
  }
  readBoolean() {
    return this.readByte() != 0;
  }
}

export { BinaryInput };
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