internal static int Find(this IEditablePdfDocument document, int windowSize, Func <byte[], bool> matches, int start = 0)
{
var end = document.Length;
var pos = start;
var window = new byte[windowSize];
while (pos < end)
{
window.Insert(document.Read(pos));
if (matches(window))
{
return(pos);
}
pos++;
}
return(-1);
}
internal static int FindReverse(this IEditablePdfDocument document, int windowSize, Func <byte[], bool> matches, int start)
{
var end = 0;
var pos = start;
var window = new byte[windowSize];
while (pos != end)
{
window.InsertReverse(document.Read(pos));
if (matches(window))
{
return(pos);
}
pos--;
}
return(-1);
}
public PdfReader(IEditablePdfDocument document)
{
_document = document;
}
internal PdfEditor(IEditablePdfDocument document)
{
_document = document;
}
internal static bool ByteEquals(this IEditablePdfDocument a, int posA, byte[] b) => a.ByteEquals(posA, b, 0);
internal static int FindReverse(this IEditablePdfDocument document, byte[] lookFor) => document.FindReverse(lookFor, document.Length - 1);
internal static int FindReverse(this IEditablePdfDocument document, byte[] lookFor, int start) => document.FindReverse(lookFor.Length, w => w.ByteEquals(lookFor), start);
internal static int FindReverse(this IEditablePdfDocument document, int windowSize, Func <byte[], bool> matches) => document.FindReverse(windowSize, matches, document.Length - 1);
internal static int Find(this IEditablePdfDocument document, byte[] lookFor) => document.Find(lookFor, 0);
internal static bool ByteEquals(this IEditablePdfDocument a, int posA, byte[] b, int posB) => a.Read(posA, b.Length - posB).ByteEquals(0, b, posB);
