load.cpp

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
/*********************************************************************************************** 
 ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               *** 
 *********************************************************************************************** 
 *                                                                                             * 
 *                 Project Name : Command & Conquer                                            * 
 *                                                                                             * 
 *                     $Archive:: /Commando/Library/LOAD.CPP                                  $* 
 *                                                                                             * 
 *                      $Author:: Greg_h                                                      $*
 *                                                                                             * 
 *                     $Modtime:: 7/22/97 11:37a                                              $*
 *                                                                                             * 
 *                    $Revision:: 1                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------* 
 * Functions:                                                                                  * 
 *   Load_Uncompress -- Load and uncompress the given file.                *
 *   Uncompress_Data -- Uncompress standard CPS buffer.                    *
 *   Load_Data -- Loads a data file from disk.                             *
 *   Load_Alloc_Data -- Loads and allocates buffer for a file.             *
 *   Write_Data -- Writes a block of data as a file to disk.               *
 *   Uncompress_Data -- Uncompresses data from one buffer to another.      *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
#include    "always.h"
#include    "iff.h"
#include    "lcw.h"
#include    <string.h>
 
 
/***************************************************************************
 * Uncompress_Data -- Uncompresses data from one buffer to another.        *
 *                                                                         *
 *    This routine takes data from a compressed file (sans the first two   *
 *    size bytes) and uncompresses it to a destination buffer.  The source *
 *    data MUST have the CompHeaderType at its start.                      *
 *                                                                         *
 * INPUT:   src   -- Source compressed data pointer.                       *
 *                                                                         *
 *          dst   -- Destination (paragraph aligned) pointer.              *
 *                                                                         *
 * OUTPUT:  Returns with the size of the uncompressed data.                *
 *                                                                         *
 * WARNINGS:   If LCW compression is used, the destination buffer must     *
 *             be paragraph aligned.                                       *
 *                                                                         *
 * HISTORY:                                                                *
 *   09/17/1993 JLB : Created.                                             *
 *=========================================================================*/
unsigned long __cdecl Uncompress_Data(void const *src, void *dst)
{
    unsigned int                    skip;           // Number of leading data to skip.
    CompressionType  method;     // Compression method used.
    unsigned long                   uncomp_size;
 
    if (!src || !dst) return(NULL);
 
    /*
    **  Interpret the data block header structure to determine
    **  compression method, size, and skip data amount.
    */
    uncomp_size = ((CompHeaderType*)src)->Size;
    #if(AMIGA)
        uncomp_size = Reverse_Long(uncomp_size);
    #endif
    skip = ((CompHeaderType*)src)->Skip;
    #if(AMIGA)
        skip = Reverse_Word(skip);
    #endif
    method = (CompressionType) ((CompHeaderType*)src)->Method;
    src = ((char*)src) + (long)sizeof(CompHeaderType) + (long)skip;
//  src = Add_Long_To_Pointer((void *)src, (long)sizeof(CompHeaderType) + (long)skip);
 
    switch (method) {
 
        default:
        case NOCOMPRESS:
            memmove(dst, (void *) src, uncomp_size);
//          Mem_Copy((void *) src, dst, uncomp_size);
            break;
 
        case HORIZONTAL:
            break;
 
        case LCW:
            LCW_Uncomp((void *) src, (void *) dst, (unsigned long) uncomp_size);
            break;
 
    }
 
    return(uncomp_size);
}