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normalize line endings in ccitt file

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This commit is contained in:
Eliot Jones 2021-08-11 21:12:35 -04:00
parent 1b472f6992
commit 53471207df
1 changed files with 20 additions and 21 deletions
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41
src/UglyToad.PdfPig/Filters/CcittFaxDecodeFilter.cs
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@ -1,24 +1,24 @@
namespace UglyToad.PdfPig.Filters
{
using System;
namespace UglyToad.PdfPig.Filters
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Tokens;
using UglyToad.PdfPig.Util;
using Util;
/// <summary>
/// Decodes image data that has been encoded using either Group 3 or Group 4.
///
/// Ported from https://github.com/apache/pdfbox/blob/714156a15ea6fcfe44ac09345b01e192cbd74450/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
/// </summary>
/// Decodes image data that has been encoded using either Group 3 or Group 4.
///
/// Ported from https://github.com/apache/pdfbox/blob/714156a15ea6fcfe44ac09345b01e192cbd74450/pdfbox/src/main/java/org/apache/pdfbox/filter/CCITTFaxFilter.java
/// </summary>
internal class CcittFaxDecodeFilter : IFilter
{
/// <inheritdoc />
/// <inheritdoc />
public bool IsSupported { get; } = true;
/// <inheritdoc />
public byte[] Decode(IReadOnlyList<byte> input, DictionaryToken streamDictionary, int filterIndex)
/// <inheritdoc />
public byte[] Decode(IReadOnlyList<byte> input, DictionaryToken streamDictionary, int filterIndex)
{
var decodeParms = DecodeParameterResolver.GetFilterParameters(streamDictionary, filterIndex);
@ -37,7 +37,7 @@
}
var k = decodeParms.GetIntOrDefault(NameToken.K, 0);
var encodedByteAlign = decodeParms.GetBooleanOrDefault(NameToken.EncodedByteAlign, false);
var encodedByteAlign = decodeParms.GetBooleanOrDefault(NameToken.EncodedByteAlign, false);
var compressionType = DetermineCompressionType(input, k);
using (var stream = new CcittFaxDecoderStream(new MemoryStream(input.ToArray()), cols, compressionType, encodedByteAlign))
{
@ -59,7 +59,7 @@
private static CcittFaxCompressionType DetermineCompressionType(IReadOnlyList<byte> input, int k)
{
if (k == 0)
{
{
var compressionType = CcittFaxCompressionType.Group3_1D; // Group 3 1D
if (input.Count < 20)
@ -85,20 +85,19 @@
return compressionType;
}
else if (k > 0)
if (k > 0)
{
// Group 3 2D
return CcittFaxCompressionType.Group3_2D;
}
else
{
return CcittFaxCompressionType.Group4_2D;
}
return CcittFaxCompressionType.Group4_2D;
}
private static void ReadFromDecoderStream(CcittFaxDecoderStream decoderStream, byte[] result)
{
int pos = 0;
var pos = 0;
int read;
while ((read = decoderStream.Read(result, pos, result.Length - pos)) > -1)
{
@ -118,5 +117,5 @@
bufferData[i] = (byte)(~bufferData[i] & 0xFF);
}
}
}
}
}
}