/// <summary>
/// Writes the specified <paramref name="database"/> into the specified <paramref name="stream"/>.
/// </summary>
/// <param name="database">The palm database.</param>
/// <param name="stream">The stream to write the database to.</param>
public static async Task WriteAsync(PalmDatabase database, Stream stream)
{
Guard.NotNull(stream, nameof(stream));
Guard.Not(stream.CanSeek == false, nameof(stream.CanSeek));
Guard.Not(stream.CanWrite == false, nameof(stream.CanWrite));
var writer = new AsyncBinaryWriter(stream);
var nameValue = new StringPalmValue(32, Encoding.UTF8, zeroTerminated: true);
await nameValue.WriteValueAsync(writer, database.Name);
var attributesValue = new EnumPalmValue <PalmDatabaseAttributes>(2);
await attributesValue.WriteValueAsync(writer, database.Attributes);
var versionValue = new UIntPalmValue(2);
await versionValue.WriteValueAsync(writer, (uint)database.Version);
var creationDateValue = new DateTimeOffsetPalmValue();
await creationDateValue.WriteValueAsync(writer, database.CreationDate);
var modificationDateValue = new DateTimeOffsetPalmValue();
await modificationDateValue.WriteValueAsync(writer, database.ModificationDate);
var lastBackupDateValue = new DateTimeOffsetPalmValue();
await lastBackupDateValue.WriteValueAsync(writer, database.LastBackupDate);
var modificationNumberValue = new UIntPalmValue(4);
await modificationNumberValue.WriteValueAsync(writer, database.ModificationNumber);
var appInfoIdValue = new UIntPalmValue(4);
var offsetOfAppInfoId = writer.Stream.Position;
await appInfoIdValue.WriteValueAsync(writer, 0);
var sortInfoIdValue = new UIntPalmValue(4);
var offsetOfSortInfoId = writer.Stream.Position;
await sortInfoIdValue.WriteValueAsync(writer, 0);
var typeValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
await typeValue.WriteValueAsync(writer, database.Type);
var creatorValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
await creatorValue.WriteValueAsync(writer, database.Creator);
var uniqueIdSeedValue = new UIntPalmValue(4);
await uniqueIdSeedValue.WriteValueAsync(writer, database.UniqueIdSeed);
var nextRecordListIdValue = new UIntPalmValue(4);
await nextRecordListIdValue.WriteValueAsync(writer, database.NextRecordListId);
var numberOfRecordsValue = new UIntPalmValue(2);
await numberOfRecordsValue.WriteValueAsync(writer, (uint)database.Records.Count);
var recordUniqueIdsAndOffsetOfDataOffsets = new Dictionary <uint, long>();
//Write the records
uint uniqueId = 0;
foreach (var record in database.Records)
{
recordUniqueIdsAndOffsetOfDataOffsets.Add(uniqueId, stream.Position);
var recordDataOffsetValue = new UIntPalmValue(4);
await recordDataOffsetValue.WriteValueAsync(writer, 0);
var recordAttributeValue = new ByteArrayPalmValue(1);
await recordAttributeValue.WriteValueAsync(writer, new[] { record.Attributes });
var uniqueIdValue = new UIntPalmValue(3);
await uniqueIdValue.WriteValueAsync(writer, uniqueId);
record.UniqueId = uniqueId;
uniqueId++;
}
var fillerValue = new ByteArrayPalmValue(2);
await fillerValue.WriteValueAsync(writer, new byte[2]);
//Write appInfo
if (database.AppInfo.Any())
{
var appInfoId = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(database.AppInfo.Length);
await dataValue.WriteValueAsync(writer, database.AppInfo);
var previousOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfAppInfoId, SeekOrigin.Begin);
await appInfoIdValue.WriteValueAsync(writer, appInfoId);
writer.Stream.Seek(previousOffset, SeekOrigin.Begin);
}
//Write sortInfo
if (database.SortInfo.Any())
{
var sortInfoId = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(database.SortInfo.Length);
await dataValue.WriteValueAsync(writer, database.SortInfo);
var previousOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfSortInfoId, SeekOrigin.Begin);
await sortInfoIdValue.WriteValueAsync(writer, sortInfoId);
writer.Stream.Seek(previousOffset, SeekOrigin.Begin);
}
//Write the record content
foreach (var record in database.Records)
{
var offsetOfDataOffset = recordUniqueIdsAndOffsetOfDataOffsets[record.UniqueId];
var dataOffset = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(record.Data.Length);
await dataValue.WriteValueAsync(writer, record.Data);
var endOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfDataOffset, SeekOrigin.Begin);
var recordDataOffsetValue = new UIntPalmValue(4);
await recordDataOffsetValue.WriteValueAsync(writer, dataOffset);
writer.Stream.Seek(endOffset, SeekOrigin.Begin);
}
}
/// <summary>
/// Reads a <see cref="PalmDatabase"/> from the specified <paramref name="stream"/>.
/// </summary>
/// <param name="stream">The stream to read the database from.</param>
public static async Task <PalmDatabase> ReadAsync(Stream stream)
{
Guard.NotNull(stream, nameof(stream));
Guard.Not(stream.CanSeek == false, nameof(stream.CanSeek));
Guard.Not(stream.CanRead == false, nameof(stream.CanRead));
var database = new PalmDatabase();
var reader = new AsyncBinaryReader(stream);
var nameValue = new StringPalmValue(32, Encoding.UTF8, zeroTerminated: true);
database.Name = await nameValue.ReadValueAsync(reader);
var attributesValue = new EnumPalmValue <PalmDatabaseAttributes>(2);
database.Attributes = await attributesValue.ReadValueAsync(reader);
var versionValue = new UIntPalmValue(2);
database.Version = (short)await versionValue.ReadValueAsync(reader);
var creationDateValue = new DateTimeOffsetPalmValue();
database.CreationDate = await creationDateValue.ReadValueAsync(reader);
var modificationDateValue = new DateTimeOffsetPalmValue();
database.ModificationDate = await modificationDateValue.ReadValueAsync(reader);
var lastBackupDateValue = new DateTimeOffsetPalmValue();
database.LastBackupDate = await lastBackupDateValue.ReadValueAsync(reader);
var modificationNumberValue = new UIntPalmValue(4);
database.ModificationNumber = await modificationNumberValue.ReadValueAsync(reader);
var appInfoIdValue = new UIntPalmValue(4);
var appInfoOffset = await appInfoIdValue.ReadValueAsync(reader);
var sortInfoIdValue = new UIntPalmValue(4);
var sortInfoOffset = await sortInfoIdValue.ReadValueAsync(reader);
var typeValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
database.Type = await typeValue.ReadValueAsync(reader);
var creatorValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
database.Creator = await creatorValue.ReadValueAsync(reader);
var uniqueIdSeedValue = new UIntPalmValue(4);
database.UniqueIdSeed = await uniqueIdSeedValue.ReadValueAsync(reader);
var nextRecordListIdValue = new UIntPalmValue(4);
database.NextRecordListId = await nextRecordListIdValue.ReadValueAsync(reader);
uint numberOfRecords = await new UIntPalmValue(2).ReadValueAsync(reader);
var recordAndDataOffsets = new List <Tuple <PalmDatabaseRecord, uint> >();
//Read the records
for (int i = 0; i < numberOfRecords; i++)
{
var recordDataOffset = await new UIntPalmValue(4).ReadValueAsync(reader);
var recordAttribute = await new ByteArrayPalmValue(1).ReadValueAsync(reader);
var uniqueId = await new UIntPalmValue(3).ReadValueAsync(reader);
var record = new PalmDatabaseRecord
{
UniqueId = uniqueId,
Attributes = recordAttribute[0],
};
recordAndDataOffsets.Add(Tuple.Create(record, recordDataOffset));
}
//Read appInfo and sortInfo
var offsets = new List <uint>
{
appInfoOffset,
sortInfoOffset,
recordAndDataOffsets.Any() ? recordAndDataOffsets[0].Item2 : (uint)reader.Stream.Length
};
offsets = offsets
.Where(f => f > 0)
.OrderBy(f => f)
.ToList();
for (int i = 0; i < offsets.Count - 1; i++)
{
var startOffset = offsets[i];
var endOffset = offsets[i + 1];
reader.Stream.Seek(startOffset, SeekOrigin.Begin);
var data = await new ByteArrayPalmValue((int)(endOffset - startOffset)).ReadValueAsync(reader);
if (startOffset == appInfoOffset)
{
database.AppInfo = data;
}
else if (startOffset == sortInfoOffset)
{
database.SortInfo = data;
}
}
if (database.AppInfo == null)
{
database.AppInfo = new byte[0];
}
if (database.SortInfo == null)
{
database.SortInfo = new byte[0];
}
//Fill all records with their content
for (int i = 0; i < numberOfRecords; i++)
{
var currentRecord = recordAndDataOffsets[i];
var nextRecord = i == numberOfRecords - 1 ? null : recordAndDataOffsets[i + 1];
var startOffset = currentRecord.Item2;
var nextStartOffset = nextRecord?.Item2 ?? (uint)reader.Stream.Length;
reader.Stream.Seek(startOffset, SeekOrigin.Begin);
var data = await new ByteArrayPalmValue((int)(nextStartOffset - startOffset)).ReadValueAsync(reader);
currentRecord.Item1.Data = data;
}
database.Records = recordAndDataOffsets
.Select(f => f.Item1)
.ToList();
return(database);
}
/// <summary>
/// Writes the specified <paramref name="database"/> into the specified <paramref name="stream"/>.
/// </summary>
/// <param name="database">The palm database.</param>
/// <param name="stream">The stream to write the database to.</param>
public static async Task WriteAsync(PalmDatabase database, Stream stream)
{
Guard.NotNull(stream, nameof(stream));
Guard.Not(stream.CanSeek == false, nameof(stream.CanSeek));
Guard.Not(stream.CanWrite == false, nameof(stream.CanWrite));
var writer = new AsyncBinaryWriter(stream);
var nameValue = new StringPalmValue(32, Encoding.UTF8, zeroTerminated:true);
await nameValue.WriteValueAsync(writer, database.Name);
var attributesValue = new EnumPalmValue<PalmDatabaseAttributes>(2);
await attributesValue.WriteValueAsync(writer, database.Attributes);
var versionValue = new UIntPalmValue(2);
await versionValue.WriteValueAsync(writer, (uint)database.Version);
var creationDateValue = new DateTimeOffsetPalmValue();
await creationDateValue.WriteValueAsync(writer, database.CreationDate);
var modificationDateValue = new DateTimeOffsetPalmValue();
await modificationDateValue.WriteValueAsync(writer, database.ModificationDate);
var lastBackupDateValue = new DateTimeOffsetPalmValue();
await lastBackupDateValue.WriteValueAsync(writer, database.LastBackupDate);
var modificationNumberValue = new UIntPalmValue(4);
await modificationNumberValue.WriteValueAsync(writer, database.ModificationNumber);
var appInfoIdValue = new UIntPalmValue(4);
var offsetOfAppInfoId = writer.Stream.Position;
await appInfoIdValue.WriteValueAsync(writer, 0);
var sortInfoIdValue = new UIntPalmValue(4);
var offsetOfSortInfoId = writer.Stream.Position;
await sortInfoIdValue.WriteValueAsync(writer, 0);
var typeValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
await typeValue.WriteValueAsync(writer, database.Type);
var creatorValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
await creatorValue.WriteValueAsync(writer, database.Creator);
var uniqueIdSeedValue = new UIntPalmValue(4);
await uniqueIdSeedValue.WriteValueAsync(writer, database.UniqueIdSeed);
var nextRecordListIdValue = new UIntPalmValue(4);
await nextRecordListIdValue.WriteValueAsync(writer, database.NextRecordListId);
var numberOfRecordsValue = new UIntPalmValue(2);
await numberOfRecordsValue.WriteValueAsync(writer, (uint)database.Records.Count);
var recordUniqueIdsAndOffsetOfDataOffsets = new Dictionary<uint, long>();
//Write the records
uint uniqueId = 0;
foreach (var record in database.Records)
{
recordUniqueIdsAndOffsetOfDataOffsets.Add(uniqueId, stream.Position);
var recordDataOffsetValue = new UIntPalmValue(4);
await recordDataOffsetValue.WriteValueAsync(writer, 0);
var recordAttributeValue = new ByteArrayPalmValue(1);
await recordAttributeValue.WriteValueAsync(writer, new[] {record.Attributes});
var uniqueIdValue = new UIntPalmValue(3);
await uniqueIdValue.WriteValueAsync(writer, uniqueId);
record.UniqueId = uniqueId;
uniqueId++;
}
var fillerValue = new ByteArrayPalmValue(2);
await fillerValue.WriteValueAsync(writer, new byte[2]);
//Write appInfo
if (database.AppInfo.Any())
{
var appInfoId = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(database.AppInfo.Length);
await dataValue.WriteValueAsync(writer, database.AppInfo);
var previousOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfAppInfoId, SeekOrigin.Begin);
await appInfoIdValue.WriteValueAsync(writer, appInfoId);
writer.Stream.Seek(previousOffset, SeekOrigin.Begin);
}
//Write sortInfo
if (database.SortInfo.Any())
{
var sortInfoId = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(database.SortInfo.Length);
await dataValue.WriteValueAsync(writer, database.SortInfo);
var previousOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfSortInfoId, SeekOrigin.Begin);
await sortInfoIdValue.WriteValueAsync(writer, sortInfoId);
writer.Stream.Seek(previousOffset, SeekOrigin.Begin);
}
//Write the record content
foreach (var record in database.Records)
{
var offsetOfDataOffset = recordUniqueIdsAndOffsetOfDataOffsets[record.UniqueId];
var dataOffset = (uint)writer.Stream.Position;
var dataValue = new ByteArrayPalmValue(record.Data.Length);
await dataValue.WriteValueAsync(writer, record.Data);
var endOffset = writer.Stream.Position;
writer.Stream.Seek(offsetOfDataOffset, SeekOrigin.Begin);
var recordDataOffsetValue = new UIntPalmValue(4);
await recordDataOffsetValue.WriteValueAsync(writer, dataOffset);
writer.Stream.Seek(endOffset, SeekOrigin.Begin);
}
}
/// <summary>
/// Reads a <see cref="PalmDatabase"/> from the specified <paramref name="stream"/>.
/// </summary>
/// <param name="stream">The stream to read the database from.</param>
public static async Task<PalmDatabase> ReadAsync(Stream stream)
{
Guard.NotNull(stream, nameof(stream));
Guard.Not(stream.CanSeek == false, nameof(stream.CanSeek));
Guard.Not(stream.CanRead == false, nameof(stream.CanRead));
var database = new PalmDatabase();
var reader = new AsyncBinaryReader(stream);
var nameValue = new StringPalmValue(32, Encoding.UTF8, zeroTerminated: true);
database.Name = await nameValue.ReadValueAsync(reader);
var attributesValue = new EnumPalmValue<PalmDatabaseAttributes>(2);
database.Attributes = await attributesValue.ReadValueAsync(reader);
var versionValue = new UIntPalmValue(2);
database.Version = (short)await versionValue.ReadValueAsync(reader);
var creationDateValue = new DateTimeOffsetPalmValue();
database.CreationDate = await creationDateValue.ReadValueAsync(reader);
var modificationDateValue = new DateTimeOffsetPalmValue();
database.ModificationDate = await modificationDateValue.ReadValueAsync(reader);
var lastBackupDateValue = new DateTimeOffsetPalmValue();
database.LastBackupDate = await lastBackupDateValue.ReadValueAsync(reader);
var modificationNumberValue = new UIntPalmValue(4);
database.ModificationNumber = await modificationNumberValue.ReadValueAsync(reader);
var appInfoIdValue = new UIntPalmValue(4);
var appInfoOffset = await appInfoIdValue.ReadValueAsync(reader);
var sortInfoIdValue = new UIntPalmValue(4);
var sortInfoOffset = await sortInfoIdValue.ReadValueAsync(reader);
var typeValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
database.Type = await typeValue.ReadValueAsync(reader);
var creatorValue = new StringPalmValue(4, Encoding.UTF8, zeroTerminated: false);
database.Creator = await creatorValue.ReadValueAsync(reader);
var uniqueIdSeedValue = new UIntPalmValue(4);
database.UniqueIdSeed = await uniqueIdSeedValue.ReadValueAsync(reader);
var nextRecordListIdValue = new UIntPalmValue(4);
database.NextRecordListId = await nextRecordListIdValue.ReadValueAsync(reader);
uint numberOfRecords = await new UIntPalmValue(2).ReadValueAsync(reader);
var recordAndDataOffsets = new List<Tuple<PalmDatabaseRecord, uint>>();
//Read the records
for (int i = 0; i < numberOfRecords; i++)
{
var recordDataOffset = await new UIntPalmValue(4).ReadValueAsync(reader);
var recordAttribute = await new ByteArrayPalmValue(1).ReadValueAsync(reader);
var uniqueId = await new UIntPalmValue(3).ReadValueAsync(reader);
var record = new PalmDatabaseRecord
{
UniqueId = uniqueId,
Attributes = recordAttribute[0],
};
recordAndDataOffsets.Add(Tuple.Create(record, recordDataOffset));
}
//Read appInfo and sortInfo
var offsets = new List<uint>
{
appInfoOffset,
sortInfoOffset,
recordAndDataOffsets.Any() ? recordAndDataOffsets[0].Item2 : (uint)reader.Stream.Length
};
offsets = offsets
.Where(f => f > 0)
.OrderBy(f => f)
.ToList();
for (int i = 0; i < offsets.Count - 1; i++)
{
var startOffset = offsets[i];
var endOffset = offsets[i + 1];
reader.Stream.Seek(startOffset, SeekOrigin.Begin);
var data = await new ByteArrayPalmValue((int)(endOffset - startOffset)).ReadValueAsync(reader);
if (startOffset == appInfoOffset)
{
database.AppInfo = data;
}
else if (startOffset == sortInfoOffset)
{
database.SortInfo = data;
}
}
if (database.AppInfo == null)
database.AppInfo = new byte[0];
if (database.SortInfo == null)
database.SortInfo = new byte[0];
//Fill all records with their content
for (int i = 0; i < numberOfRecords; i++)
{
var currentRecord = recordAndDataOffsets[i];
var nextRecord = i == numberOfRecords - 1 ? null : recordAndDataOffsets[i + 1];
var startOffset = currentRecord.Item2;
var nextStartOffset = nextRecord?.Item2 ?? (uint)reader.Stream.Length;
reader.Stream.Seek(startOffset, SeekOrigin.Begin);
var data = await new ByteArrayPalmValue((int)(nextStartOffset - startOffset)).ReadValueAsync(reader);
currentRecord.Item1.Data = data;
}
database.Records = recordAndDataOffsets
.Select(f => f.Item1)
.ToList();
return database;
}