Why would you spend hours aimlessly browsing the sdk when you can ask
an expert like Jay?
On Thu, May 15, 2008 at 5:17 AM, theY4Kman <[EMAIL PROTECTED]> wrote:
> Thank you, Jay. I should've peeked around more in the SDK =/
>
> On Thu, May 15, 2008 at 12:00 AM, Jay Stelly <[EMAIL PROTECTED]> wrote:
>
>> Our code does a search for the signature.
>> There's code for this in src/public/zip_utils.cpp. If that's not in the
>> sdk then here's the relevant code:
>>
>> //----------------------------------------------------------------------
>> -------
>> // Purpose: Load pak file from raw buffer
>> // Input : *buffer -
>> // bufferlength -
>> //----------------------------------------------------------------------
>> -------
>> void CZipFile::ParseFromBuffer( void *buffer, int bufferlength )
>> {
>> // Throw away old data
>> Reset();
>>
>> // Initialize a buffer
>> CUtlBuffer buf( 0, bufferlength +1 );
>> // +1 for null termination
>>
>> // need to swap bytes, so set the buffer opposite the machine's
>> endian
>> buf.ActivateByteSwapping( m_Swap.IsSwappingBytes() );
>>
>> buf.Put( buffer, bufferlength );
>>
>> buf.SeekGet( CUtlBuffer::SEEK_TAIL, 0 );
>> unsigned int fileLen = buf.TellGet();
>>
>> // Start from beginning
>> buf.SeekGet( CUtlBuffer::SEEK_HEAD, 0 );
>>
>> unsigned int offset;
>> ZIP_EndOfCentralDirRecord rec = { 0 };
>>
>> bool bFoundEndOfCentralDirRecord = false;
>> for ( offset = fileLen - sizeof( ZIP_EndOfCentralDirRecord );
>> offset >= 0; offset-- )
>> {
>> buf.SeekGet( CUtlBuffer::SEEK_HEAD, offset );
>> buf.GetObjects( &rec );
>> if ( rec.signature == PKID( 5, 6 ) )
>> {
>> bFoundEndOfCentralDirRecord = true;
>>
>> // Set any xzip configuration
>> if ( rec.commentLength )
>> {
>> char commentString[128];
>> int commentLength = min(
>> rec.commentLength, sizeof( commentString ) );
>> buf.Get( commentString, commentLength );
>> commentString[commentLength] = '\0';
>> ParseXZipCommentString( commentString );
>> }
>> break;
>> }
>> else
>> {
>> // wrong record
>> rec.nCentralDirectoryEntries_Total = 0;
>> }
>> }
>>
>> > -----Original Message-----
>> > From: [EMAIL PROTECTED]
>> > [mailto:[EMAIL PROTECTED] On Behalf Of
>> > Mark Chandler
>> > Sent: Wednesday, May 14, 2008 8:33 PM
>> > To: 'Discussion of Half-Life Programming'
>> > Subject: Re: [hlcoders] Pakfile Lump Reading
>> >
>> > Just read in every thing but the comment into the struct.
>> > Grab the size of the comment then read the comment. Not to
>> > hard as I have done this about a week ago.
>> >
>> > -----Original Message-----
>> > From: [EMAIL PROTECTED]
>> > [mailto:[EMAIL PROTECTED] On Behalf Of
>> > theY4Kman
>> > Sent: Thursday, May 15, 2008 10:00 AM
>> > To: Discussion of Half-Life Programming
>> > Subject: Re: [hlcoders] Pakfile Lump Reading
>> >
>> > I don't believe you understand my message correctly. The
>> > ZIP_EndOfCentralDirRecord is essentially at the end of the
>> > file. One would parse the file by fseek'ing to
>> > (EOF-sizeof(ZIP_EndOfCentralDirRecord)) and fread'ing in the struct.
>> > However, since the comment is of variable length, there is no
>> > way to correctly read in the ZIP_EndOfCentralDirRecord. Thus,
>> > there is no way to access commentLength.
>> >
>> > On Wed, May 14, 2008 at 9:53 PM, Mark Chandler
>> > <[EMAIL PROTECTED]> wrote:
>> >
>> > > You can work out the size of the comment by commentLength
>> > >
>> > > -----Original Message-----
>> > > From: [EMAIL PROTECTED]
>> > > [mailto:[EMAIL PROTECTED] On Behalf Of
>> > > theY4Kman
>> > > Sent: Thursday, May 15, 2008 8:18 AM
>> > > To: Discussion of Half-Life Programming
>> > > Subject: [hlcoders] Pakfile Lump Reading
>> > >
>> > > I'm developing a C++ extension for SourceMod which will extract the
>> > > files stored in the Pakfile lump of a BSP. I read over the
>> > page, "The
>> > > Source Engine BSP File Format
>> > > <http://www.geocities.com/cofrdrbob/bspformat.html
>> > > >,"
>> > > by Rof and it has helped me a lot. I've been trying to retrieve the
>> > > list
>> > of
>> > > ZIP_FileHeaders, but I've had some trouble: I don't know how it's
>> > > possible to get the ZIP_EndOfCentralDirRecord. Rof's page
>> > states that
>> > > this struct
>> > is
>> > > at the end of the Pakfile lump. However, the struct has a variable
>> > > length comment at the end of it. The only way I can know
>> > the size of
>> > > that comment is to have the ZIP_EndOfCentralDirRecord at
>> > hand...You can see my dilemma.
>> > >
>> > > struct ZIP_EndOfCentralDirRecord
>> > > {
>> > > DECLARE_BYTESWAP_DATADESC();
>> > > unsigned int signature; // 4 bytes PK56
>> > > unsigned short numberOfThisDisk; // 2 bytes
>> > > unsigned short
>> > numberOfTheDiskWithStartOfCentralDirectory; // 2
>> > bytes
>> > > unsigned short nCentralDirectoryEntries_ThisDisk;
>> > // 2 bytes
>> > > unsigned short nCentralDirectoryEntries_Total; // 2 bytes
>> > > unsigned int centralDirectorySize; // 4 bytes
>> > > unsigned int startOfCentralDirOffset; // 4 bytes
>> > > unsigned short commentLength; // 2 bytes
>> > > // zip file comment follows
>> > > };
>> > > _______________________________________________
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>> > > please visit:
>> > > http://list.valvesoftware.com/mailman/listinfo/hlcoders
>> > >
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>> > >
>> > >
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>> >
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>> >
>> >
>>
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>>
>>
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