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63 lines
2 KiB
C++
63 lines
2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* Additional copyright for this file:
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* Copyright (C) 1999-2000 Revolution Software Ltd.
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* This code is based on source code created by Revolution Software,
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* used with permission.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "engines/icb/common/px_rcutypes.h"
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#include "engines/icb/common/px_string.h"
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#include "engines/icb/common/px_common.h"
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#include "engines/icb/common/px_clu_api.h"
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#include "engines/icb/common/px_linkeddatafile.h"
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namespace ICB {
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// get NUMBER given HASH (does the search) - hashs must be ordered for this binary search to succeed.
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uint32 LinkedDataObject::Fetch_item_number_by_hash(LinkedDataFile *file, const uint32 hash) {
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int32 top, bottom;
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int32 i;
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uint32 current;
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if (!FROM_LE_32(file->number_of_items))
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return PX_LINKED_DATA_FILE_ERROR;
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top = FROM_LE_32(file->number_of_items) - 1;
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i = top >> 1;
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bottom = 0;
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for (;;) {
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current = FROM_LE_32(file->list[i].name_hash_value);
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if (hash == current)
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return i;
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else if (top == bottom)
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return PX_LINKED_DATA_FILE_ERROR;
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else if (hash > current) {
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bottom = i + 1;
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i = (top + bottom) >> 1;
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} else {
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top = i;
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i = (top + bottom) >> 1;
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}
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}
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}
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} // End of namespace ICB
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