public Replacement(Deletion deletion, Insertion insertion)
{
base.Index = Math.Min(deletion.Index, insertion.Index);
base.Type = EditType.Replacement;
base.Position = insertion.Position;
base.Value = insertion.Value;
}
/// <summary>
/// Unpacks a byte array into an edit script for patching data.
/// </summary>
/// <param name="packedEditScript">The byte array representing the edit script.</param>
/// <returns>The unpacked edit script.</returns>
public static EditScript Unpack(byte[] packedEditScript)
{
EditScript editScript = new EditScript();
// Read the format which determines how the packed edit script is read
var format = (EditScriptFormat)packedEditScript[Header.Format];
if (format == EditScriptFormat.Grouped)
{
// Read the number of deletions, insertions and replacements
int deletions = packedEditScript[Header.Deletions];
int insertions = packedEditScript[Header.Insertions];
int replacements = packedEditScript[Header.Replacements];
// Set the start indexes of the deletion, insertion and replacement sections
Deletion.Start = Header.Size;
Insertion.Start = Deletion.Start + deletions;
Replacement.Start = Insertion.Start + insertions;
// Read and all all deletions
for (int current = 0; current < deletions; current++)
{
// Read and create the deletion
int position = packedEditScript[Deletion.Start + current];
var deletion = new Diff.Data.Deletion(position);
// Add the deletion into the edit script
editScript.Deletions.Add(deletion);
editScript.Edits.Add(deletion);
}
// Read and add all insertions
for (int current = 0; current < insertions; current++)
{
// Read and create the insertion
byte value = packedEditScript[Insertion.Start + Insertion.Size * current + Insertion.Value];
int position = packedEditScript[Insertion.Start + Insertion.Size * current + Insertion.Position];
var insertion = new Diff.Data.Insertion(position, value);
// Add the insertion into the edit script
editScript.Insertions.Add(insertion);
editScript.Edits.Add(insertion);
}
// Read and add all replacements
for (int current = 0; current < replacements; current++)
{
// Read and create the replacement
byte value = packedEditScript[Replacement.Start + Replacement.Size * current + Replacement.Value];
int position = packedEditScript[Replacement.Start + Replacement.Size * current + Replacement.Position];
var insertion = new Diff.Data.Replacement(position, value);
// Add the replacement into the edit script
editScript.Insertions.Add(insertion);
editScript.Edits.Add(insertion);
}
}
return(editScript);
}
