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Fix zip64 having invalid header

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This commit is contained in:
UnknownShadow200 2018-07-26 05:34:03 +10:00
parent 455e76ad73
commit bd2c38b717
1 changed files with 29 additions and 22 deletions
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51
MCGalaxy/Server/ZipWriter.cs
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@ -106,7 +106,7 @@ namespace MCGalaxy {
}
public sealed class ZipWriter {
BinaryWriter w;
BinaryWriter writer;
Stream stream;
byte[] buffer = new byte[81920];
@ -116,11 +116,12 @@ namespace MCGalaxy {
int numEntries;
long centralDirOffset, centralDirSize, zip64EndOffset;
const ushort ver_norm = 20, ver_zip64 = 45, zip64Extra = 28;
const ushort ver_norm = 20, ver_zip64 = 45;
const ushort zip64CentralExtra = 28, zip64LocalExtra = 20;
public ZipWriter(Stream stream) {
this.stream = stream;
w = new BinaryWriter(stream);
writer = new BinaryWriter(stream);
}
public void WriteEntry(Stream src, string file, bool compress) {
@ -129,7 +130,7 @@ namespace MCGalaxy {
entry.LocalHeaderOffset = stream.Position;
// leave some room to fill in header later
int headerSize = 30 + entry.Filename.Length + zip64Extra;
int headerSize = 30 + entry.Filename.Length + zip64LocalExtra;
stream.Write(buffer, 0, headerSize);
// set bit flag for non-ascii filename
@ -156,7 +157,7 @@ namespace MCGalaxy {
for (int i = 0; i < numEntries; i++) {
// turns out we didn't actually need zip64 extra field
ZipEntry entry = entries[i];
if (!zip64) entry.LocalHeaderOffset += zip64Extra;
if (!zip64) entry.LocalHeaderOffset += zip64LocalExtra;
stream.Seek(entry.LocalHeaderOffset, SeekOrigin.Begin);
WriteLocalFileRecord(entry);
@ -190,8 +191,9 @@ namespace MCGalaxy {
void WriteLocalFileRecord(ZipEntry entry) {
ushort extraLen = (ushort)(zip64 ? zip64Extra : 0);
ushort extraLen = (ushort)(zip64 ? zip64LocalExtra : 0);
ushort version = zip64 ? ver_zip64 : ver_norm;
BinaryWriter w = writer;
ZipEntry copy = entry;
if (zip64) entry.Reset();
@ -207,12 +209,18 @@ namespace MCGalaxy {
w.Write(extraLen);
w.Write(entry.Filename);
if (zip64) WriteZip64ExtraField(copy, false);
if (!zip64) return;
w.Write((ushort)1);
w.Write((ushort)(zip64LocalExtra - 4));
w.Write(copy.UncompressedSize);
w.Write(copy.CompressedSize);
}
void WriteCentralDirectoryRecord(ZipEntry entry) {
ushort extraLen = (ushort)(zip64 ? zip64Extra : 0);
ushort extraLen = (ushort)(zip64 ? zip64CentralExtra : 0);
ushort version = zip64 ? ver_zip64 : ver_norm;
BinaryWriter w = writer;
ZipEntry copy = entry;
if (zip64) entry.Reset();
@ -234,30 +242,27 @@ namespace MCGalaxy {
w.Write((int)entry.LocalHeaderOffset);
w.Write(entry.Filename);
if (zip64) WriteZip64ExtraField(copy, true);
}
void WriteZip64ExtraField(ZipEntry entry, bool offset) {
int len = zip64Extra - 4; // ignore header size
if (!offset) len -= 8;
if (!zip64) return;
w.Write((ushort)1);
w.Write((ushort)1); // mapping id
w.Write((ushort)len);
w.Write(entry.UncompressedSize);
w.Write(entry.CompressedSize);
if (offset) w.Write(entry.LocalHeaderOffset);
w.Write((ushort)(zip64CentralExtra - 4));
w.Write(copy.UncompressedSize);
w.Write(copy.CompressedSize);
w.Write(copy.LocalHeaderOffset);
}
void WriteLastModified() {
int modTime = (now.Second / 2) | (now.Minute << 5) | (now.Hour << 11);
int modDate = (now.Day) | (now.Month << 5) | ((now.Year - 1980) << 9);
w.Write((ushort)modTime);
w.Write((ushort)modDate);
writer.Write((ushort)modTime);
writer.Write((ushort)modDate);
}
void WriteZip64EndOfCentralDirectoryRecord() {
w.Write((uint)0x06064b50);
BinaryWriter w = writer;
const long zip64EndDataSize = (2 * 2) + (2 * 4) + (4 * 8);
w.Write((uint)0x06064b50);
w.Write(zip64EndDataSize);
w.Write(ver_zip64);
w.Write(ver_zip64);
@ -270,6 +275,7 @@ namespace MCGalaxy {
}
void WriteZip64EndOfCentralDirectoryLocator() {
BinaryWriter w = writer;
w.Write((uint)0x07064b50);
w.Write(0); // disk number of zip64 end of central directory
w.Write(zip64EndOffset);
@ -277,6 +283,7 @@ namespace MCGalaxy {
}
void WriteEndOfCentralDirectoryRecord() {
BinaryWriter w = writer;
w.Write(0x06054b50);
w.Write((ushort)0); // disk number
w.Write((ushort)0); // disk number of start