mirror of https://gitlab.com/nakst/essence
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
//
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// Copyright(C) 1993-1996 Id Software, Inc.
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// Copyright(C) 2005-2014 Simon Howard
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// DESCRIPTION:
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// Generate a checksum of the WAD directory.
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//
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#include "essence/include.h"
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#include "m_misc.h"
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#include "sha1.h"
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#include "w_checksum.h"
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#include "w_wad.h"
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static wad_file_t **open_wadfiles = NULL;
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static int num_open_wadfiles = 0;
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static int GetFileNumber(wad_file_t *handle)
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{
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int i;
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int result;
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for (i=0; i<num_open_wadfiles; ++i)
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{
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if (open_wadfiles[i] == handle)
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{
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return i;
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}
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}
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// Not found in list. This is a new file we haven't seen yet.
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// Allocate another slot for this file.
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open_wadfiles = ES_realloc(open_wadfiles,
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sizeof(wad_file_t *) * (num_open_wadfiles + 1));
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open_wadfiles[num_open_wadfiles] = handle;
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result = num_open_wadfiles;
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++num_open_wadfiles;
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return result;
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}
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static void ChecksumAddLump(sha1_context_t *sha1_context, lumpinfo_t *lump)
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{
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char buf[9];
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M_StringCopy(buf, lump->name, sizeof(buf));
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SHA1_UpdateString(sha1_context, buf);
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SHA1_UpdateInt32(sha1_context, GetFileNumber(lump->wad_file));
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SHA1_UpdateInt32(sha1_context, lump->position);
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SHA1_UpdateInt32(sha1_context, lump->size);
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}
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void W_Checksum(sha1_digest_t digest)
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{
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sha1_context_t sha1_context;
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unsigned int i;
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SHA1_Init(&sha1_context);
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num_open_wadfiles = 0;
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// Go through each entry in the WAD directory, adding information
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// about each entry to the SHA1 hash.
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for (i=0; i<numlumps; ++i)
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{
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ChecksumAddLump(&sha1_context, &lumpinfo[i]);
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}
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SHA1_Final(digest, &sha1_context);
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}
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