VAR/VAR.PdfTools
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PdfDocument: Move filter processing to PdfFilters.

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This commit is contained in:
Valeriano A.R.
2016-06-25 14:52:21 +02:00
parent 241b68bd0a
commit 58c09c1110
4 changed files with 101 additions and 43 deletions
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90
VAR.PdfTools/PdfDocument.cs
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@@ -1,7 +1,6 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
namespace VAR.PdfTools
@@ -36,51 +35,14 @@ namespace VAR.PdfTools
#region Private methods
private static byte[] DecodeFlateStreamData(byte[] streamData)
private static void ApplyFilterToStream(PdfStream stream, string filter)
{
MemoryStream msInput = new MemoryStream(streamData);
MemoryStream msOutput = new MemoryStream();
// It seems to work when skipping the first two bytes.
byte header;
header = (byte)msInput.ReadByte();
header = (byte)msInput.ReadByte();
DeflateStream zip = new DeflateStream(msInput, CompressionMode.Decompress, true);
int cbRead;
byte[] abResult = new byte[1024];
do
{
cbRead = zip.Read(abResult, 0, abResult.Length);
if (cbRead > 0)
{
msOutput.Write(abResult, 0, cbRead);
}
}
while (cbRead > 0);
zip.Close();
msOutput.Flush();
if (msOutput.Length >= 0)
{
msOutput.Capacity = (int)msOutput.Length;
return msOutput.GetBuffer();
}
return null;
}
private static void ApplyFiltersToStreams(PdfStream stream)
{
string filter = stream.Dictionary.GetParamAsString("Filter");
if (filter == "FlateDecode")
{
stream.OriginalData = stream.Data;
stream.OriginalFilter = stream.Dictionary.Values["Filter"];
byte[] decodedStreamData = DecodeFlateStreamData(stream.Data);
byte[] decodedStreamData = PdfFilters.FlateDecode.Decode(stream.Data);
stream.Data = decodedStreamData;
stream.Dictionary.Values["Length"] = new PdfInteger { Value = decodedStreamData.Length };
stream.Dictionary.Values.Remove("Filter");
}
else if(filter == "ASCII85Decode" || filter == "A85")
else if (filter == "ASCII85Decode" || filter == "A85")
{
// FIXME: Implement this filter
}
@@ -92,11 +54,55 @@ namespace VAR.PdfTools
{
// FIXME: Implement this filter
}
else
{
// FIXME: Implement the rest of filters
}
}
private static void ApplyFiltersToStreams(PdfStream stream)
{
if (stream.Dictionary.Values.ContainsKey("Filter") == false) { return; }
IPdfElement elemFilter = stream.Dictionary.Values["Filter"];
stream.OriginalData = stream.Data;
stream.OriginalFilter = stream.Dictionary.Values["Filter"];
if (elemFilter is PdfString)
{
ApplyFilterToStream(stream, ((PdfString)elemFilter).Value);
}
else if (elemFilter is PdfName)
{
ApplyFilterToStream(stream, ((PdfName)elemFilter).Value);
}
else if(elemFilter is PdfArray)
{
foreach(IPdfElement elemSubFilter in ((PdfArray)elemFilter).Values)
{
if (elemSubFilter is PdfString)
{
ApplyFilterToStream(stream, ((PdfString)elemSubFilter).Value);
}
else if (elemSubFilter is PdfName)
{
ApplyFilterToStream(stream, ((PdfName)elemSubFilter).Value);
}
else
{
throw new Exception("PdfFilter not correctly specified");
}
}
}
else
{
throw new Exception("PdfFilter not correctly specified");
}
stream.Dictionary.Values["Length"] = new PdfInteger { Value = stream.Data.Length };
stream.Dictionary.Values.Remove("Filter");
}
private static IPdfElement ResolveIndirectReferences(IPdfElement elem, Dictionary<int, PdfObject> dictReferences)
{
if (elem is PdfObjectReference)
@@ -211,7 +217,7 @@ namespace VAR.PdfTools
do
{
PdfObject obj = parser.ParseObject(doc.Objects);
if (obj != null)
if (obj != null && obj.Data != null)
{
if (obj.Data is PdfStream)
{

50
VAR.PdfTools/PdfFilters.cs Normal file
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@@ -0,0 +1,50 @@
using System;
using System.IO;
using System.IO.Compression;
namespace VAR.PdfTools
{
public static class PdfFilters
{
public class FlateDecode
{
public byte[] Encode(byte[] streamData)
{
throw new NotImplementedException("FlateFilter.Encode: Not implemented");
}
public static byte[] Decode(byte[] streamData)
{
MemoryStream msInput = new MemoryStream(streamData);
MemoryStream msOutput = new MemoryStream();
// It seems to work when skipping the first two bytes.
byte header;
header = (byte)msInput.ReadByte();
header = (byte)msInput.ReadByte();
DeflateStream zip = new DeflateStream(msInput, CompressionMode.Decompress, true);
int cbRead;
byte[] abResult = new byte[1024];
do
{
cbRead = zip.Read(abResult, 0, abResult.Length);
if (cbRead > 0)
{
msOutput.Write(abResult, 0, cbRead);
}
}
while (cbRead > 0);
zip.Close();
msOutput.Flush();
if (msOutput.Length >= 0)
{
msOutput.Capacity = (int)msOutput.Length;
return msOutput.GetBuffer();
}
return null;
}
}
}
}

1
VAR.PdfTools/VAR.PdfTools.Net35.csproj
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@@ -43,6 +43,7 @@
<Compile Include="PdfDocument.cs" />
<Compile Include="PdfDocumentPage.cs" />
<Compile Include="PdfElements.cs" />
<Compile Include="PdfFilters.cs" />
<Compile Include="PdfFont.cs" />
<Compile Include="PdfParser.cs" />
<Compile Include="PdfStandar14FontMetrics.cs" />

1
VAR.PdfTools/VAR.PdfTools.csproj
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@@ -43,6 +43,7 @@
<Compile Include="PdfDocument.cs" />
<Compile Include="PdfDocumentPage.cs" />
<Compile Include="PdfElements.cs" />
<Compile Include="PdfFilters.cs" />
<Compile Include="PdfFont.cs" />
<Compile Include="PdfParser.cs" />
<Compile Include="PdfStandar14FontMetrics.cs" />