// Copyright (c) Six Labors and contributors.
// Licensed under the Apache License, Version 2.0.

namespace SixLabors.ImageSharp.Tests
{
    using System.IO;
    using Xunit;

    using ImageSharp.Formats.Tiff;

    public class PackBitsTiffCompressionTests
    {
        [Theory]
        [InlineData(new byte[] { }, new byte[] { })]
        [InlineData(new byte[] { 0x00, 0x2A }, new byte[] { 0x2A })] // Read one byte
        [InlineData(new byte[] { 0x01, 0x15, 0x32 }, new byte[] { 0x15, 0x32 })] // Read two bytes
        [InlineData(new byte[] { 0xFF, 0x2A }, new byte[] { 0x2A, 0x2A })] // Repeat two bytes
        [InlineData(new byte[] { 0xFE, 0x2A }, new byte[] { 0x2A, 0x2A, 0x2A })] // Repeat three bytes
        [InlineData(new byte[] { 0x80 }, new byte[] { })] // Read a 'No operation' byte
        [InlineData(new byte[] { 0x01, 0x15, 0x32, 0x80, 0xFF, 0xA2 }, new byte[] { 0x15, 0x32, 0xA2, 0xA2 })] // Read two bytes, nop, repeat two bytes
        [InlineData(new byte[] { 0xFE, 0xAA, 0x02, 0x80, 0x00, 0x2A, 0xFD, 0xAA, 0x03, 0x80, 0x00, 0x2A, 0x22, 0xF7, 0xAA },
                new byte[] { 0xAA, 0xAA, 0xAA, 0x80, 0x00, 0x2A, 0xAA, 0xAA, 0xAA, 0xAA, 0x80, 0x00, 0x2A, 0x22, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA })] // Apple PackBits sample
        public void Decompress_ReadsData(byte[] inputData, byte[] expectedResult)
        {
            Stream stream = new MemoryStream(inputData);
            byte[] buffer = new byte[expectedResult.Length];

            PackBitsTiffCompression.Decompress(stream, inputData.Length, buffer);

            Assert.Equal(expectedResult, buffer);
        }
    }
}