public void NefsHeaderPart1_MultipleItems_EntriesPopulated()
{
var items = new NefsItemList(@"C:\archive.nefs");
var file1DataSource = new NefsItemListDataSource(items, 123, new NefsItemSize(456, new List <UInt32> {
11, 12, 13
}));
var file1 = new NefsItem(new NefsItemId(0), "file1", new NefsItemId(0), NefsItemType.File, file1DataSource, TestHelpers.CreateUnknownData());
items.Add(file1);
var file2DataSource = new NefsItemListDataSource(items, 456, new NefsItemSize(789, new List <UInt32> {
14, 15, 16
}));
var file2 = new NefsItem(new NefsItemId(1), "file2", new NefsItemId(1), NefsItemType.File, file2DataSource, TestHelpers.CreateUnknownData());
items.Add(file2);
var dir1DataSource = new NefsEmptyDataSource();
var dir1 = new NefsItem(new NefsItemId(2), "dir1", new NefsItemId(2), NefsItemType.Directory, dir1DataSource, TestHelpers.CreateUnknownData());
items.Add(dir1);
var p4 = new NefsHeaderPart4(items);
var p1 = new NefsHeaderPart1(items, p4);
Assert.Equal(3, p1.EntriesById.Count);
/*
* dir1
*/
// Offset to data and index to p4 are both 0 since this is a directory
Assert.Equal(2, (int)p1.EntriesById[dir1.Id].Id.Value);
Assert.Equal(0, (int)p1.EntriesById[dir1.Id].OffsetToData);
Assert.Equal(0, (int)p1.EntriesById[dir1.Id].MetadataIndex);
Assert.Equal(0, (int)p1.EntriesById[dir1.Id].IndexIntoPart4);
/*
* file1
*/
Assert.Equal(0, (int)p1.EntriesById[file1.Id].Id.Value);
Assert.Equal(123, (int)p1.EntriesById[file1.Id].OffsetToData);
Assert.Equal(1, (int)p1.EntriesById[file1.Id].MetadataIndex);
Assert.Equal(0, (int)p1.EntriesById[file1.Id].IndexIntoPart4);
/*
* file2
*/
Assert.Equal(1, (int)p1.EntriesById[file2.Id].Id.Value);
Assert.Equal(456, (int)p1.EntriesById[file2.Id].OffsetToData);
Assert.Equal(2, (int)p1.EntriesById[file2.Id].MetadataIndex);
// There are 3 chunks for file1, so file2's chunks start right after that (hence p4
// index == 3)
Assert.Equal(3, (int)p1.EntriesById[file2.Id].IndexIntoPart4);
}
public void NefsHeaderPart1_NoItems_EntriesEmpty()
{
var items = new NefsItemList(@"C:\archive.nefs");
var p4 = new NefsHeaderPart4(items);
var p1 = new NefsHeaderPart1(items, p4);
Assert.Empty(p1.EntriesById);
}
/// <summary>
/// Writes the header part to an output stream.
/// </summary>
/// <param name="stream">The stream to write to.</param>
/// <param name="offset">The absolute offset in the stream to write at.</param>
/// <param name="part1">The data to write.</param>
/// <param name="p">Progress info.</param>
/// <returns>An async task.</returns>
internal async Task WriteHeaderPart1Async(Stream stream, UInt64 offset, NefsHeaderPart1 part1, NefsProgress p)
{
foreach (var entry in part1.EntriesByIndex)
{
await FileData.WriteDataAsync(stream, offset, entry, NefsVersion.Version200, p);
offset += NefsHeaderPart1Entry.Size;
}
}
public void NefsHeaderPart1_MultipleItems_EntriesPopulated()
{
var items = new NefsItemList(@"C:\archive.nefs");
var file1Chunks = NefsDataChunk.CreateChunkList(new List <UInt32> {
11, 12, 13
}, TestHelpers.TestTransform);
var file1DataSource = new NefsItemListDataSource(items, 123, new NefsItemSize(456, file1Chunks));
var file1 = TestHelpers.CreateFile(0, 0, "file1", file1DataSource);
items.Add(file1);
var file2Chunks = NefsDataChunk.CreateChunkList(new List <UInt32> {
14, 15, 16
}, TestHelpers.TestTransform);
var file2DataSource = new NefsItemListDataSource(items, 456, new NefsItemSize(789, file2Chunks));
var file2 = TestHelpers.CreateFile(1, 1, "file2", file2DataSource);
items.Add(file2);
var dir1 = TestHelpers.CreateDirectory(2, 2, "dir1");
items.Add(dir1);
var p4 = new Nefs20HeaderPart4(items);
var p1 = new NefsHeaderPart1(items, p4);
Assert.Equal(3, p1.EntriesByGuid.Count);
Assert.Equal(3, p1.EntriesByIndex.Count);
/*
* dir1
*/
// Offset to data and index to p4 are both 0 since this is a directory
Assert.Equal(2, (int)p1.EntriesByGuid[dir1.Guid].Id.Value);
Assert.Equal(0, (int)p1.EntriesByGuid[dir1.Guid].OffsetToData);
Assert.Equal(0, (int)p1.EntriesByGuid[dir1.Guid].IndexPart2);
Assert.Equal(0, (int)p1.EntriesByGuid[dir1.Guid].IndexPart4);
/*
* file1
*/
Assert.Equal(0, (int)p1.EntriesByGuid[file1.Guid].Id.Value);
Assert.Equal(123, (int)p1.EntriesByGuid[file1.Guid].OffsetToData);
Assert.Equal(1, (int)p1.EntriesByGuid[file1.Guid].IndexPart2);
Assert.Equal(0, (int)p1.EntriesByGuid[file1.Guid].IndexPart4);
/*
* file2
*/
Assert.Equal(1, (int)p1.EntriesByGuid[file2.Guid].Id.Value);
Assert.Equal(456, (int)p1.EntriesByGuid[file2.Guid].OffsetToData);
Assert.Equal(2, (int)p1.EntriesByGuid[file2.Guid].IndexPart2);
// There are 3 chunks for file1, so file2's chunks start right after that (hence p4
// index == 3)
Assert.Equal(3, (int)p1.EntriesByGuid[file2.Guid].IndexPart4);
}
/// <summary>
/// Reads header part 6 from an input stream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="offset">The offset to the header part from the beginning of the stream.</param>
/// <param name="part1">Header part 1. Used to match part 6 data with an item.</param>
/// <param name="p">Progress info.</param>
/// <returns>The loaded header part.</returns>
internal async Task <Nefs20HeaderPart6> Read20HeaderPart6Async(Stream stream, uint offset, NefsHeaderPart1 part1, NefsProgress p)
{
var entries = new List <Nefs20HeaderPart6Entry>();
var numItems = part1.EntriesByIndex.Count;
var size = numItems * Nefs20HeaderPart6Entry.Size;
// Validate inputs
if (!this.ValidateHeaderPartStream(stream, offset, (uint)size, "6"))
{
return(new Nefs20HeaderPart6(entries));
}
// Get entries in part 6
var entryOffset = offset;
for (var i = 0; i < numItems; ++i)
{
using (p.BeginTask(1.0f / numItems))
{
// Make sure there is a corresponding index in part 1
if (i >= part1.EntriesByIndex.Count)
{
Log.LogError($"Could not find matching item entry for part 6 index {i} in part 1.");
continue;
}
// Get Guid from part 1. Part 1 entry order matches part 6 entry order.
var guid = part1.EntriesByIndex[i].Guid;
// Read the entry data
var entry = new Nefs20HeaderPart6Entry(guid);
await FileData.ReadDataAsync(stream, entryOffset, entry, NefsVersion.Version200, p);
entryOffset += Nefs20HeaderPart6Entry.Size;
entries.Add(entry);
}
}
return(new Nefs20HeaderPart6(entries));
}
/// <summary>
/// Reads header part 4 from an input stream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="offset">The offset to the header part from the beginning of the stream.</param>
/// <param name="size">The size of the header part.</param>
/// <param name="part1">Header part 1.</param>
/// <param name="p">Progress info.</param>
/// <returns>The loaded header part.</returns>
internal async Task <Nefs20HeaderPart4> Read20HeaderPart4Async(Stream stream, uint offset, uint size, NefsHeaderPart1 part1, NefsProgress p)
{
var entries = new List <Nefs20HeaderPart4Entry>();
var indexLookup = new Dictionary <Guid, uint>();
// Validate inputs
if (!this.ValidateHeaderPartStream(stream, offset, size, "4"))
{
return(new Nefs20HeaderPart4(entries, indexLookup));
}
// Get entries in part 4
var numEntries = size / Nefs20HeaderPart4Entry.Size;
var entryOffset = offset;
for (var i = 0; i < numEntries; ++i)
{
using (p.BeginTask(1.0f / numEntries))
{
var entry = new Nefs20HeaderPart4Entry();
await FileData.ReadDataAsync(stream, entryOffset, entry, NefsVersion.Version200, p);
entryOffset += Nefs20HeaderPart4Entry.Size;
entries.Add(entry);
}
}
// Create a table to allow looking up a part 4 index by item Guid
foreach (var p1 in part1.EntriesByIndex)
{
indexLookup.Add(p1.Guid, p1.IndexPart4);
}
return(new Nefs20HeaderPart4(entries, indexLookup));
}
/// <summary>
/// Reads a version 2.0 header from an input stream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="offset">The offset to the header from the beginning of the stream.</param>
/// <param name="part6Stream">The stream that contains part 6/7 data.</param>
/// <param name="part6Offset">The offset to the start of part 6/7 data.</param>
/// <param name="intro">The pre-parsed header intro.</param>
/// <param name="p">Progress info.</param>
/// <returns>The loaded header.</returns>
internal async Task <Nefs20Header> Read20HeaderAsync(
Stream stream,
ulong offset,
Stream part6Stream,
ulong part6Offset,
NefsHeaderIntro intro,
NefsProgress p)
{
Nefs20HeaderIntroToc toc = null;
NefsHeaderPart1 part1 = null;
NefsHeaderPart2 part2 = null;
NefsHeaderPart3 part3 = null;
Nefs20HeaderPart4 part4 = null;
NefsHeaderPart5 part5 = null;
Nefs20HeaderPart6 part6 = null;
NefsHeaderPart7 part7 = null;
NefsHeaderPart8 part8 = null;
// Calc weight of each task (8 parts + table of contents)
var weight = 1.0f / 10.0f;
using (p.BeginTask(weight, "Reading header intro table of contents"))
{
toc = await this.Read20HeaderIntroTocAsync(stream, Nefs20HeaderIntroToc.Offset, p);
}
using (p.BeginTask(weight, "Reading header part 1"))
{
part1 = await this.ReadHeaderPart1Async(stream, toc.OffsetToPart1, toc.Part1Size, p);
}
using (p.BeginTask(weight, "Reading header part 2"))
{
part2 = await this.ReadHeaderPart2Async(stream, toc.OffsetToPart2, toc.Part2Size, p);
}
using (p.BeginTask(weight, "Reading header part 3"))
{
part3 = await this.ReadHeaderPart3Async(stream, toc.OffsetToPart3, toc.Part3Size, p);
}
using (p.BeginTask(weight, "Reading header part 4"))
{
part4 = await this.Read20HeaderPart4Async(stream, toc.OffsetToPart4, toc.Part4Size, part1, p);
}
using (p.BeginTask(weight, "Reading header part 5"))
{
part5 = await this.ReadHeaderPart5Async(stream, toc.OffsetToPart5, NefsHeaderPart5.Size, p);
}
using (p.BeginTask(weight, "Reading header part 6"))
{
part6 = await this.Read20HeaderPart6Async(part6Stream, (uint)part6Offset + toc.OffsetToPart6, part1, p);
}
using (p.BeginTask(weight, "Reading header part 7"))
{
var numEntries = (uint)part2.EntriesByIndex.Count;
part7 = await this.ReadHeaderPart7Async(part6Stream, (uint)part6Offset + toc.OffsetToPart7, numEntries, p);
}
using (p.BeginTask(weight, "Reading header part 8"))
{
var part8Size = intro.HeaderSize - toc.OffsetToPart8;
part8 = await this.ReadHeaderPart8Async(stream, toc.OffsetToPart8, part8Size, p);
}
// Validate header hash
if (!this.ValidateHash(stream, offset, intro))
{
Log.LogWarning("Header hash does not match expected value.");
}
// The header stream must be disposed
stream.Dispose();
return(new Nefs20Header(intro, toc, part1, part2, part3, part4, part5, part6, part7, part8));
}
public async Task WriteHeaderPart1Async_ValidData_Written()
{
var items = new NefsItemList(@"C:\hi.txt");
var file1 = TestHelpers.CreateItem(0, 0, "file1", 10, 11, new List <UInt32> {
12, 13
}, NefsItemType.File);
var file2 = TestHelpers.CreateItem(1, 1, "file2", 20, 21, new List <UInt32> {
22, 23
}, NefsItemType.File);
var dir1 = TestHelpers.CreateItem(2, 2, "dir1", 0, 0, new List <UInt32> {
0
}, NefsItemType.Directory);
items.Add(file1);
items.Add(file2);
items.Add(dir1);
var part4 = new Nefs20HeaderPart4(items);
var part1 = new NefsHeaderPart1(items, part4);
/*
* Write
*/
var writer = this.CreateWriter();
byte[] buffer;
var offset = 5;
using (var ms = new MemoryStream())
{
await writer.WriteHeaderPart1Async(ms, (uint)offset, part1, new NefsProgress());
buffer = ms.ToArray();
}
/*
* Verify
*/
/*
* file1
*/
// Data offset (8 bytes)
Assert.Equal(10, BitConverter.ToInt64(buffer, offset + 0));
// Index part 2
Assert.Equal(1, BitConverter.ToInt32(buffer, offset + 8));
// Index part 4
Assert.Equal(0, BitConverter.ToInt32(buffer, offset + 0x0c));
// Item id
Assert.Equal(0, BitConverter.ToInt32(buffer, offset + 0x10));
/*
* file2
*/
offset += (int)NefsHeaderPart1Entry.Size;
// Data offset (8 bytes)
Assert.Equal(20, BitConverter.ToInt64(buffer, offset + 0));
// Index part 2
Assert.Equal(2, BitConverter.ToInt32(buffer, offset + 8));
// Index part 4
Assert.Equal(2, BitConverter.ToInt32(buffer, offset + 0x0c));
// Item id
Assert.Equal(1, BitConverter.ToInt32(buffer, offset + 0x10));
/*
* dir1
*/
offset += (int)NefsHeaderPart1Entry.Size;
// Data offset (8 bytes)
Assert.Equal(0, BitConverter.ToInt64(buffer, offset + 0));
// Index part 2
Assert.Equal(0, BitConverter.ToInt32(buffer, offset + 8));
// Index part 4
Assert.Equal(0, BitConverter.ToInt32(buffer, offset + 0x0c));
// Item id
Assert.Equal(2, BitConverter.ToInt32(buffer, offset + 0x10));
}
/// <summary>
/// Reads header part 4 from an input stream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="offset">The offset to the header part from the beginning of the stream.</param>
/// <param name="size">The size of the header part.</param>
/// <param name="part1">Header part 1.</param>
/// <param name="part2">Header part 2.</param>
/// <param name="p">Progress info.</param>
/// <returns>The loaded header part.</returns>
internal async Task <NefsHeaderPart4> ReadHeaderPart4Async(
Stream stream,
uint offset,
uint size,
NefsHeaderPart1 part1,
NefsHeaderPart2 part2,
NefsProgress p)
{
var entries = new Dictionary <uint, NefsHeaderPart4Entry>();
// Validate inputs
if (!this.ValidateHeaderPartStream(stream, offset, size, "4"))
{
return(new NefsHeaderPart4(entries));
}
// Get the chunk sizes for each item in the archive
var numItems = part1.EntriesById.Count;
for (var i = 0; i < numItems; ++i)
{
using (p.BeginTask(1.0f / numItems))
{
var id = new NefsItemId((uint)i);
// Part 1 entry
if (!part1.EntriesById.ContainsKey(id))
{
Log.LogError($"Failed to find part 1 entry for item {id} when reading part 4.");
continue;
}
var p1 = part1.EntriesById[id];
// Part 2 entry
if (!part2.EntriesById.ContainsKey(id))
{
Log.LogError($"Failed to find part 2 entry for item {id} when reading part 4.");
continue;
}
var p2 = part2.EntriesById[id];
// Create part 4 entry
var entry = new NefsHeaderPart4Entry(id);
// Check if item has part 4 entry
if (p1.IndexIntoPart4 == 0xFFFFFFFF)
{
// Item is most likely not compressed or has no data
continue;
}
if (p2.Data0x0c_ExtractedSize.Value == 0)
{
// Item is probably a directory
continue;
}
// Get number of chunks
var numChunks = (int)Math.Ceiling(p2.Data0x0c_ExtractedSize.Value / (double)NefsHeader.ChunkSize);
if (numChunks == 0)
{
Log.LogError($"Item {p1.Id} contains no compressed chunks but was expected to.");
continue;
}
// Seek stream to start of chunk sizes for this item
var itemOffset = offset + p1.OffsetIntoPart4;
if ((long)itemOffset + NefsHeaderPart4.DataSize > stream.Length)
{
Log.LogError($"Item {p1.Id} has part 4 entry that is outside the bounds of header part 4.");
continue;
}
// Seek stream
stream.Seek((long)itemOffset, SeekOrigin.Begin);
// Process the chunk sizes
for (var chunkIdx = 0; chunkIdx < numChunks; ++chunkIdx)
{
var bytes = new byte[NefsHeaderPart4.DataSize];
await stream.ReadAsync(bytes, 0, NefsHeaderPart4.DataSize);
entry.ChunkSizes.Add(BitConverter.ToUInt32(bytes, 0));
}
// Record entry
entries.Add(p1.IndexIntoPart4, entry);
}
}
// Return part 4
return(new NefsHeaderPart4(entries));
}
/// <summary>
/// Reads the header from an input stream.
/// </summary>
/// <param name="originalStream">The stream to read from.</param>
/// <param name="offset">The offset to the header from the beginning of the stream.</param>
/// <param name="p">Progress info.</param>
/// <returns>The loaded header.</returns>
internal async Task <NefsHeader> ReadHeaderAsync(Stream originalStream, ulong offset, NefsProgress p)
{
Stream stream;
NefsHeaderIntro intro = null;
NefsHeaderIntroToc toc = null;
NefsHeaderPart1 part1 = null;
NefsHeaderPart2 part2 = null;
NefsHeaderPart3 part3 = null;
NefsHeaderPart4 part4 = null;
NefsHeaderPart5 part5 = null;
NefsHeaderPart6 part6 = null;
NefsHeaderPart7 part7 = null;
NefsHeaderPart8 part8 = null;
// Calc weight of each task (8 parts + intro + table of contents)
var weight = 1.0f / 10.0f;
using (p.BeginTask(weight, "Reading header intro"))
{
// Decrypt header if needed
(intro, stream) = await this.ReadHeaderIntroAsync(originalStream, offset, p);
}
using (p.BeginTask(weight, "Reading header intro table of contents"))
{
toc = await this.ReadHeaderIntroTocAsync(stream, NefsHeaderIntroToc.Offset, p);
}
using (p.BeginTask(weight, "Reading header part 1"))
{
part1 = await this.ReadHeaderPart1Async(stream, toc.OffsetToPart1, toc.Part1Size, p);
}
using (p.BeginTask(weight, "Reading header part 2"))
{
part2 = await this.ReadHeaderPart2Async(stream, toc.OffsetToPart2, toc.Part2Size, p);
}
using (p.BeginTask(weight, "Reading header part 3"))
{
part3 = await this.ReadHeaderPart3Async(stream, toc.OffsetToPart3, toc.Part3Size, p);
}
using (p.BeginTask(weight, "Reading header part 4"))
{
part4 = await this.ReadHeaderPart4Async(stream, toc.OffsetToPart4, toc.Part4Size, part1, part2, p);
}
using (p.BeginTask(weight, "Reading header part 5"))
{
part5 = await this.ReadHeaderPart5Async(stream, toc.OffsetToPart5, toc.Part5Size, p);
}
using (p.BeginTask(weight, "Reading header part 6"))
{
if (toc.OffsetToPart6 == 0)
{
// game.dat files don't have part 6
Log.LogDebug("Archive does not have header part 6.");
part6 = new NefsHeaderPart6(new List <NefsHeaderPart6Entry>());
}
else
{
part6 = await this.ReadHeaderPart6Async(stream, toc.OffsetToPart6, toc.Part6Size, part2, p);
}
}
using (p.BeginTask(weight, "Reading header part 7"))
{
if (toc.OffsetToPart6 == 0)
{
// game.dat files don't have part 7. Still checking if part 6 offset is 0. For
// some reason, the part 7 offset still has a value, but doesn't appear to be a
// correct one, so skipping part 7 as well
Log.LogDebug("Archive does not have header part 7.");
part7 = new NefsHeaderPart7(new List <NefsHeaderPart7Entry>());
}
else
{
part7 = await this.ReadHeaderPart7Async(stream, toc.OffsetToPart7, toc.Part7Size, p);
}
}
using (p.BeginTask(weight, "Reading header part 8"))
{
var part8Size = intro.HeaderSize - toc.OffsetToPart8;
part8 = await this.ReadHeaderPart8Async(stream, toc.OffsetToPart8, part8Size, p);
}
// Validate header hash
if (!this.ValidateHash(stream, offset, intro))
{
Log.LogWarning("Header hash does not match expected value.");
}
// The header stream must be disposed
stream.Dispose();
return(new NefsHeader(intro, toc, part1, part2, part3, part4, part5, part6, part7, part8));
}
public async void ReadHeaderPart4Async_ValidData_DataRead()
{
// Item 1 has 2 chunk sizes
var e1p1 = new NefsHeaderPart1Entry(Guid.NewGuid());
e1p1.Data0x10_Id.Value = 0;
e1p1.Data0x0c_IndexPart4.Value = 0;
// Item 2 has 1 chunk size
var e2p1 = new NefsHeaderPart1Entry(Guid.NewGuid());
e2p1.Data0x10_Id.Value = 1;
e2p1.Data0x0c_IndexPart4.Value = 2;
// Item 3 has no chunks
var e3p1 = new NefsHeaderPart1Entry(Guid.NewGuid());
e3p1.Data0x10_Id.Value = 2;
e3p1.Data0x0c_IndexPart4.Value = 0xFFFFFFFF;
// Item 4 is a directory (extracted size == 0)
var e4p1 = new NefsHeaderPart1Entry(Guid.NewGuid());
e4p1.Data0x10_Id.Value = 3;
e4p1.Data0x0c_IndexPart4.Value = 0;
// Item 5 has 3 chunks
var e5p1 = new NefsHeaderPart1Entry(Guid.NewGuid());
e5p1.Data0x10_Id.Value = 4;
e5p1.Data0x0c_IndexPart4.Value = 3;
var part1Items = new List <NefsHeaderPart1Entry>
{
e1p1,
e2p1,
e3p1,
e4p1,
e5p1,
};
var part1 = new NefsHeaderPart1(part1Items);
// Setup data
byte[] bytes =
{
// Offset
0xFF, 0xFF,
// Item 1
0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x17, 0x18,
// Item 2
0x21, 0x22, 0x23, 0x24,
// Item 5
0x31, 0x32, 0x33, 0x34,
0x35, 0x36, 0x37, 0x38,
0x39, 0x3A, 0x3B, 0x3C,
// Last four bytes
0x01, 0x02, 0x03, 0x04,
};
var stream = new MemoryStream(bytes);
var reader = new NefsReader(this.fileSystem);
var size = (uint)28;
var offset = (uint)2;
// Test
var part4 = await reader.Read20HeaderPart4Async(stream, offset, size, part1, this.p);
// Verify
Assert.Equal(7, part4.EntriesByIndex.Count);
// Item 1
Assert.Equal((uint)0x14131211, part4.EntriesByIndex[0].CumulativeChunkSize);
Assert.Equal((uint)0x18171615, part4.EntriesByIndex[1].CumulativeChunkSize);
// Item 2
Assert.Equal((uint)0x24232221, part4.EntriesByIndex[2].CumulativeChunkSize);
// Item 3
Assert.Equal((uint)0x34333231, part4.EntriesByIndex[3].CumulativeChunkSize);
Assert.Equal((uint)0x38373635, part4.EntriesByIndex[4].CumulativeChunkSize);
Assert.Equal((uint)0x3C3B3A39, part4.EntriesByIndex[5].CumulativeChunkSize);
}
/// <summary>
/// Writes an archive to the specified stream. A new archive obejct is returned that
/// contains the updated header and item metadata.
/// </summary>
/// <param name="stream">The stream to write to.</param>
/// <param name="sourceHeader">Donor header information.</param>
/// <param name="sourceItems">List of items to write. This list is not modified directly.</param>
/// <param name="workDir">Temp working directory path.</param>
/// <param name="p">Progress info.</param>
/// <returns>A new NefsArchive object containing the updated header and item metadata.</returns>
private async Task <NefsArchive> WriteArchiveAsync(
Stream stream,
Nefs20Header sourceHeader,
NefsItemList sourceItems,
string workDir,
NefsProgress p)
{
// Setup task weights
var taskWeightPrepareItems = 0.45f;
var taskWeightWriteItems = 0.45f;
var taskWeightHeader = 0.1f;
// Prepare items for writing
NefsItemList items;
using (var t = p.BeginTask(taskWeightPrepareItems, "Preparing items"))
{
items = await this.PrepareItemsAsync(sourceItems, workDir, p);
}
// Determine number of items
var numItems = items.Count;
// Update header parts 3 and 4 first (need to know their sizes)
var p4 = new Nefs20HeaderPart4(items);
var p3 = new NefsHeaderPart3(items);
// Compute header size
var introSize = NefsHeaderIntro.Size;
var tocSize = Nefs20HeaderIntroToc.Size;
var p1Size = numItems * NefsHeaderPart1Entry.Size; // TODO : What about duplicates?
var p2Size = numItems * NefsHeaderPart2Entry.Size; // TODO : What about duplicates?
var p3Size = p3.Size;
var p4Size = p4.Size;
var p5Size = NefsHeaderPart5.Size;
var p6Size = numItems * Nefs20HeaderPart6Entry.Size;
var p7Size = numItems * NefsHeaderPart7Entry.Size;
var p8Size = sourceHeader.Intro.HeaderSize - sourceHeader.TableOfContents.OffsetToPart8;
var headerSize = introSize + tocSize + p1Size + p2Size + p3Size + p4Size + p5Size + p6Size + p7Size + p8Size;
// Determine first data offset. There are two known offset values. If the header is
// large enough, the second (larger) offset is used.
var firstDataOffset = Nefs20Header.DataOffsetDefault;
if (headerSize > firstDataOffset)
{
firstDataOffset = Nefs20Header.DataOffsetLarge;
}
// Write item data
UInt64 archiveSize;
using (var t = p.BeginTask(taskWeightWriteItems, "Writing items"))
{
archiveSize = await this.WriteItemsAsync(stream, items, firstDataOffset, p);
}
// Update remaining header data
var p1 = new NefsHeaderPart1(items, p4);
var p2 = new NefsHeaderPart2(items, p3);
var p6 = new Nefs20HeaderPart6(items);
var p7 = new NefsHeaderPart7(items);
// Compute total archive size
var p5 = new NefsHeaderPart5();
p5.Data0x00_ArchiveSize.Value = archiveSize;
p5.Data0x08_ArchiveNameStringOffset.Value = p3.OffsetsByFileName[items.DataFileName];
p5.Data0x0C_FirstDataOffset.Value = sourceHeader.Part5.FirstDataOffset;
// Update header intro
var intro = new NefsHeaderIntro();
intro.Data0x00_MagicNumber.Value = sourceHeader.Intro.MagicNumber;
intro.Data0x24_AesKeyHexString.Value = sourceHeader.Intro.AesKeyHexString;
intro.Data0x64_HeaderSize.Value = (uint)headerSize;
intro.Data0x68_NefsVersion.Value = sourceHeader.Intro.NefsVersion;
intro.Data0x6c_NumberOfItems.Value = (uint)numItems;
intro.Data0x70_UnknownZlib.Value = sourceHeader.Intro.Unknown0x70zlib;
intro.Data0x78_Unknown.Value = sourceHeader.Intro.Unknown0x78;
var toc = new Nefs20HeaderIntroToc();
toc.Data0x00_NumVolumes.Value = sourceHeader.TableOfContents.NumVolumes;
toc.Data0x02_HashBlockSize.Value = sourceHeader.TableOfContents.Data0x02_HashBlockSize.Value;
toc.Data0x04_OffsetToPart1.Value = introSize + tocSize;
toc.Data0x0c_OffsetToPart2.Value = toc.OffsetToPart1 + (uint)p1Size;
toc.Data0x14_OffsetToPart3.Value = toc.OffsetToPart2 + (uint)p2Size;
toc.Data0x18_OffsetToPart4.Value = toc.OffsetToPart3 + (uint)p3Size;
toc.Data0x1c_OffsetToPart5.Value = toc.OffsetToPart4 + (uint)p4Size;
toc.Data0x08_OffsetToPart6.Value = toc.OffsetToPart5 + (uint)p5Size;
toc.Data0x10_OffsetToPart7.Value = toc.OffsetToPart6 + (uint)p6Size;
toc.Data0x20_OffsetToPart8.Value = toc.OffsetToPart7 + (uint)p7Size;
toc.Data0x24_Unknown.Value = sourceHeader.TableOfContents.Unknown0x24;
// Part 8 - not writing anything for now
var p8 = new NefsHeaderPart8(p8Size);
// Create new header object
var header = new Nefs20Header(intro, toc, p1, p2, p3, p4, p5, p6, p7, p8);
// Write the header
using (var t = p.BeginTask(taskWeightHeader, "Writing header"))
{
await this.WriteHeaderAsync(stream, 0, header, p);
}
// Update hash
await this.UpdateHashAsync(stream, 0, header, p);
// Create new archive object
return(new NefsArchive(header, items));
}
