aisouard

/**
 * Read an EBML tag header or length and return their respective values into
 * single numbers.
 *
 * @example
 * var tagHeader = new Uint8Array([0x1A, 0x45, 0xDF, 0xA3, 0x01, 0x00, 0x00,
 *                                 0x00, 0x00, 0x00, 0x00, 0x1F]);
 * var tagId = readVariableInt(tagHeader, 4, 0);
 * console.log('The current tag ID is: ', tagId.value, ', skipping ', tagId.size, ' bytes.');
 * // The current tag ID is: 172351395, skipping 4 bytes.