vpk.h

   1 // This software is not affiliated with Valve Corporation
   2 //   We are not affiliated, associated, authorized, endorsed by, or in any way officially
   3 //   connected with Valve Corporation, or any of its subsidiaries or its affiliates.
   4 //
   5 //   All trademarks are property of their respective owners
   6
   7 // Valve pak file directory reader
   8
   9 // VPK
  10 //=======================================================================================================================
  11
  12 typedef struct VPKHeader VPKHeader;
  13 typedef struct VPKDirectoryEntry VPKDirectoryEntry;
  14
  15 // API
  16 // ---
  17
  18 // There is no load function, reading the header file as binary is enough.
  19 VPKDirectoryEntry *vpk_find( VPKHeader *self, const char *asset );
  20 void vpk_free( VPKHeader *self );
  21
  22 #pragma pack(push, 1)
  23 struct VPKHeader
  24 {
  25         u32 Signature;
  26         u32 Version;
  27         u32 TreeSize;
  28         u32 FileDataSectionSize;
  29         u32 ArchiveMD5SectionSize;
  30         u32 OtherMD5SectionSize;
  31         u32 SignatureSectionSize;
  32 };
  33
  34 struct VPKDirectoryEntry
  35 {
  36         u32 CRC;
  37         u16 PreloadBytes;
  38         u16 ArchiveIndex;
  39         u32 EntryOffset;
  40         u32 EntryLength;
  41         u16 Terminator;
  42 };
  43 #pragma pack(pop)
  44
  45 #ifdef VALVE_IMPLEMENTATION
  46
  47 void vpk_free( VPKHeader *self )
  48 {
  49         free( self );
  50 }
  51
  52 VPKDirectoryEntry *vpk_find( VPKHeader *self, const char *asset )
  53 {
  54         if( !self )
  55                 return NULL;
  56
  57         char wbuf[ 512 ];
  58         strcpy( wbuf, asset );
  59
  60         char *ext = csr_findext( wbuf, '.' );
  61         *(ext-1) = 0x00;
  62         char *fn = csr_findext( wbuf, '/' );
  63         *(fn-1) = 0x00;
  64         char *dir = wbuf;
  65
  66         char *pCur = ((char *)self) + sizeof( VPKHeader );
  67
  68         while( 1 )
  69         {
  70                 if( !*pCur ) break;
  71
  72                 int bExt = !strcmp( ext, pCur );
  73
  74                 while( *( pCur ++ ) ) {};
  75                 while( 1 )
  76                 {
  77                         if( !*pCur ) { pCur ++; break; }
  78
  79                         int bDir = !strcmp( dir, pCur );
  80
  81                         while( *( pCur ++ ) ) {};
  82                         while( 1 )
  83                         {
  84                                 if( !*pCur ) { pCur ++; break; }
  85
  86                                 const char *vpk_fn = pCur;
  87
  88                                 while( *( pCur ++ ) ) {};
  89                                 VPKDirectoryEntry *entry = (VPKDirectoryEntry *)pCur;
  90
  91                                 if( !strcmp( vpk_fn, fn ) && bExt && bDir )
  92                                 {
  93                                         return entry;
  94                                 }
  95
  96                                 pCur += entry->PreloadBytes + sizeof( VPKDirectoryEntry );
  97                         }
  98
  99                         if( bDir && bExt ) return NULL;
 100                 }
 101
 102                 if( bExt ) return NULL;
 103         }
 104
 105         return NULL;
 106 }
 107
 108 #endif