private void ReadSectionDetails(ArchiveSectionMetadataBuilder[] sections)
{
#region Counts
bool hasStreamCounts = false;
ArchiveMetadataToken token;
for (;;)
{
token = ReadToken();
if (token == ArchiveMetadataToken.End || token == ArchiveMetadataToken.CRC || token == ArchiveMetadataToken.Size)
{
break;
}
if (token == ArchiveMetadataToken.NumUnpackStream)
{
hasStreamCounts = true;
foreach (var section in sections)
{
section.SubStreamCount = ReadNumberAsInt32();
}
}
else
{
SkipDataBlock();
}
}
if (!hasStreamCounts)
{
foreach (var section in sections)
{
section.SubStreamCount = 1;
}
}
#endregion
#region Sizes
foreach (var section in sections)
{
// v3.13 was broken and wrote empty sections
// v4.07 added compat code to skip empty sections
if (section.SubStreamCount.Value == 0)
{
continue;
}
var remaining = section.OutputLength;
var subsections = new DecodedStreamMetadata[section.SubStreamCount.Value];
for (int i = 0; i < subsections.Length - 1; i++)
{
if (token == ArchiveMetadataToken.Size)
{
var size = ReadNumberAsInt64();
if (size == 0 || size >= remaining)
{
throw new InvalidDataException();
}
subsections[i] = new DecodedStreamMetadata(size, null);
remaining -= size;
}
}
if (remaining == 0)
{
throw new InvalidDataException();
}
subsections[subsections.Length - 1] = new DecodedStreamMetadata(remaining, null);
section.Subsections = subsections;
}
if (token == ArchiveMetadataToken.Size)
{
token = ReadToken();
}
#endregion
#region Checksums
int requiredChecksumCount = 0;
int totalChecksumCount = 0;
ImmutableArray <Checksum?> .Builder checksums = null;
foreach (var section in sections)
{
// If there is only one stream and we have a section checksum 7z doesn't store the checksum again.
if (!(section.SubStreamCount == 1 && section.OutputChecksum.HasValue))
{
requiredChecksumCount += section.SubStreamCount.Value;
}
totalChecksumCount += section.SubStreamCount.Value;
}
for (;;)
{
if (token == ArchiveMetadataToken.End)
{
if (checksums == null)
{
checksums = ImmutableArray.CreateBuilder <Checksum?>(totalChecksumCount);
for (int i = 0; i < totalChecksumCount; i++)
{
checksums.Add(null);
}
}
break;
}
else if (token == ArchiveMetadataToken.CRC)
{
checksums = ImmutableArray.CreateBuilder <Checksum?>(totalChecksumCount);
var vector = ReadOptionalBitVector(requiredChecksumCount);
int requiredChecksumIndex = 0;
foreach (var section in sections)
{
if (section.SubStreamCount == 1 && section.OutputChecksum.HasValue)
{
checksums.Add(section.OutputChecksum.Value);
}
else
{
for (int i = 0; i < section.SubStreamCount; i++)
{
if (vector[requiredChecksumIndex++])
{
checksums.Add(new Checksum(ReadInt32()));
}
else
{
checksums.Add(null);
}
}
}
}
System.Diagnostics.Debug.Assert(requiredChecksumIndex == requiredChecksumCount);
System.Diagnostics.Debug.Assert(checksums.Count == totalChecksumCount);
}
else
{
SkipDataBlock();
}
token = ReadToken();
}
#endregion
}
private void ReadSectionDetails(ArchiveSectionMetadataBuilder[] sections)
{
#region Counts
bool hasStreamCounts = false;
ArchiveMetadataToken token;
for (;;)
{
token = ReadToken();
if (token == ArchiveMetadataToken.End || token == ArchiveMetadataToken.CRC || token == ArchiveMetadataToken.Size)
break;
if (token == ArchiveMetadataToken.NumUnpackStream)
{
hasStreamCounts = true;
foreach (var section in sections)
section.SubStreamCount = ReadNumberAsInt32();
}
else
{
SkipDataBlock();
}
}
if (!hasStreamCounts)
foreach (var section in sections)
section.SubStreamCount = 1;
#endregion
#region Sizes
foreach (var section in sections)
{
// v3.13 was broken and wrote empty sections
// v4.07 added compat code to skip empty sections
if (section.SubStreamCount.Value == 0)
continue;
var remaining = section.OutputLength;
var subsections = new DecodedStreamMetadata[section.SubStreamCount.Value];
for (int i = 0; i < subsections.Length - 1; i++)
{
if (token == ArchiveMetadataToken.Size)
{
var size = ReadNumberAsInt64();
if (size == 0 || size >= remaining)
throw new InvalidDataException();
subsections[i] = new DecodedStreamMetadata(size, null);
remaining -= size;
}
}
if (remaining == 0)
throw new InvalidDataException();
subsections[subsections.Length - 1] = new DecodedStreamMetadata(remaining, null);
section.Subsections = subsections;
}
if (token == ArchiveMetadataToken.Size)
token = ReadToken();
#endregion
#region Checksums
int requiredChecksumCount = 0;
int totalChecksumCount = 0;
ImmutableArray<Checksum?>.Builder checksums = null;
foreach (var section in sections)
{
// If there is only one stream and we have a section checksum 7z doesn't store the checksum again.
if (!(section.SubStreamCount == 1 && section.OutputChecksum.HasValue))
requiredChecksumCount += section.SubStreamCount.Value;
totalChecksumCount += section.SubStreamCount.Value;
}
for (;;)
{
if (token == ArchiveMetadataToken.End)
{
if (checksums == null)
{
checksums = ImmutableArray.CreateBuilder<Checksum?>(totalChecksumCount);
for (int i = 0; i < totalChecksumCount; i++)
checksums.Add(null);
}
break;
}
else if (token == ArchiveMetadataToken.CRC)
{
checksums = ImmutableArray.CreateBuilder<Checksum?>(totalChecksumCount);
var vector = ReadOptionalBitVector(requiredChecksumCount);
int requiredChecksumIndex = 0;
foreach (var section in sections)
{
if (section.SubStreamCount == 1 && section.OutputChecksum.HasValue)
{
checksums.Add(section.OutputChecksum.Value);
}
else
{
for (int i = 0; i < section.SubStreamCount; i++)
{
if (vector[requiredChecksumIndex++])
checksums.Add(new Checksum(ReadInt32()));
else
checksums.Add(null);
}
}
}
System.Diagnostics.Debug.Assert(requiredChecksumIndex == requiredChecksumCount);
System.Diagnostics.Debug.Assert(checksums.Count == totalChecksumCount);
}
else
{
SkipDataBlock();
}
token = ReadToken();
}
#endregion
}