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start adding support for reading encrypted documents

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Eliot Jones
2019-05-04 15:36:13 +01:00
parent b2a3ae7a49
commit be394f5bba
21 changed files with 534 additions and 66 deletions
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14
src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs
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@@ -4,6 +4,7 @@
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using Encryption;
using Exceptions;
using Filters;
using IO;
@@ -30,6 +31,8 @@
private readonly IFilterProvider filterProvider;
private readonly CoreTokenScanner coreTokenScanner;
private IEncryptionHandler encryptionHandler;
/// <summary>
/// Stores tokens encountered between obj - endobj markers for each <see cref="MoveNext"/> call.
/// Cleared after each operation.
@@ -44,14 +47,21 @@
public long CurrentPosition => coreTokenScanner.CurrentPosition;
public PdfTokenScanner(IInputBytes inputBytes, IObjectLocationProvider objectLocationProvider, IFilterProvider filterProvider)
public PdfTokenScanner(IInputBytes inputBytes, IObjectLocationProvider objectLocationProvider, IFilterProvider filterProvider,
IEncryptionHandler encryptionHandler)
{
this.inputBytes = inputBytes;
this.objectLocationProvider = objectLocationProvider;
this.filterProvider = filterProvider;
this.encryptionHandler = encryptionHandler;
coreTokenScanner = new CoreTokenScanner(inputBytes);
}
public void UpdateEncryptionHandler(IEncryptionHandler newHandler)
{
encryptionHandler = newHandler ?? throw new ArgumentNullException(nameof(newHandler));
}
public bool MoveNext()
{
// Read until we find object-number generation obj, e.g. "69 420 obj".
@@ -527,7 +537,7 @@
}
// Read the N integers
var bytes = new ByteArrayInputBytes(stream.Decode(filterProvider));
var bytes = new ByteArrayInputBytes(stream.Decode(filterProvider, encryptionHandler));
var scanner = new CoreTokenScanner(bytes);