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Add support for skipping GZip comments and original filename fields, fixes #91.

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This commit is contained in:
UnknownShadow200 2015-10-05 16:24:06 +11:00
parent d0445ba54d
commit 28583dd90d
1 changed files with 27 additions and 3 deletions
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30
ClassicalSharp/Network/Utils/GZipHeaderReader.cs
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@ -14,6 +14,8 @@ namespace ClassicalSharp {
CompressionFlags,
OperatingSystem,
HeaderChecksum,
Filename,
Comment,
Done,
}
@ -22,7 +24,7 @@ namespace ClassicalSharp {
int flags;
int partsRead;
public bool ReadHeader( Stream s ) {
public bool ReadHeader( Stream s ) {
switch( state ) {
case State.Header1:
@ -43,7 +45,7 @@ namespace ClassicalSharp {
case State.Flags:
if( !ReadHeaderByte( s, out flags ) )
return false;
if( flags >= 0x04 ) // We don't support extra, comment, or original name fields
if( (flags & 0x04) != 0 )
throw new NotSupportedException( "Unsupported gzip flags: " + flags );
goto case State.LastModifiedTime;
@ -67,7 +69,29 @@ namespace ClassicalSharp {
int os;
if( !ReadHeaderByte( s, out os ) )
return false;
goto case State.HeaderChecksum;
goto case State.Filename;
case State.Filename:
if( (flags & 0x08) != 0 ) {
for( ; ; ) {
int part = s.ReadByte();
if( part == -1 ) return false;
if( part == 0 ) break;
}
}
state = State.Comment;
goto case State.Comment;
case State.Comment:
if( (flags & 0x10) != 0 ) {
for( ; ; ) {
int part = s.ReadByte();
if( part == -1 ) return false;
if( part == 0 ) break;
}
}
state = State.HeaderChecksum;
goto case State.HeaderChecksum;
case State.HeaderChecksum:
if( ( flags & 0x02 ) != 0 ) {