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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sci/engine/message.h"
#include "sci/tools.h"
namespace Sci {
static int get_talker_trivial(IndexRecordCursor *cursor) {
return -1;
}
/* Version 2.101 and later code ahead */
static void index_record_parse_2101(IndexRecordCursor *cursor, MessageTuple *t) {
int noun = *(cursor->index_record + 0);
int verb = *(cursor->index_record + 1);
t->noun = noun;
t->verb = verb;
t->cond = t->seq = 0;
}
static void index_record_get_text_2101(IndexRecordCursor *cursor, char *buffer, int buffer_size) {
int offset = READ_LE_UINT16(cursor->index_record + 2);
char *stringptr = (char *)cursor->resource_beginning + offset;
strncpy(buffer, stringptr, buffer_size);
}
static int header_get_index_record_count_2101(byte *header) {
return READ_LE_UINT16(header + 4);
}
// Version 3.411 and later code ahead
static void index_record_parse_3411(IndexRecordCursor *cursor, MessageTuple *t) {
int noun = *(cursor->index_record + 0);
int verb = *(cursor->index_record + 1);
int cond = *(cursor->index_record + 2);
int seq = *(cursor->index_record + 3);
t->noun = noun;
t->verb = verb;
t->cond = cond;
t->seq = seq;
}
static int index_record_get_talker_3411(IndexRecordCursor *cursor) {
return *(cursor->index_record + 4);
}
static void index_record_get_text_3411(IndexRecordCursor *cursor, char *buffer, int buffer_size) {
int offset = READ_LE_UINT16(cursor->index_record + 5);
char *stringptr = (char *)cursor->resource_beginning + offset;
strncpy(buffer, stringptr, buffer_size);
}
static int header_get_index_record_count_3411(byte *header) {
return READ_LE_UINT16(header + 8);
}
// Generic code from here on
static int four_tuple_match(MessageTuple *t1, MessageTuple *t2) {
return t1->noun == t2->noun && t1->verb == t2->verb && t1->cond == t2->cond && t1->seq == t2->seq;
}
static void index_record_cursor_initialize(MessageState *state, IndexRecordCursor *cursor) {
cursor->resource_beginning = state->current_res->data;
cursor->index_record = state->index_records;
cursor->index = 1;
}
static int index_record_next(MessageState *state, IndexRecordCursor *cursor) {
if (cursor->index == state->record_count)
return 0;
cursor->index_record += state->handler->index_record_size;
cursor->index ++;
return 1;
}
static int index_record_find(MessageState *state, MessageTuple *t, IndexRecordCursor *cursor) {
MessageTuple looking_at;
int found = 0;
index_record_cursor_initialize(state, cursor);
do {
state->handler->parse(cursor, &looking_at);
if (four_tuple_match(t, &looking_at))
found = 1;
} while (!found && index_record_next(state, cursor));
// FIXME: Recursion not handled yet
return found;
}
int MessageState::getSpecific(MessageTuple *t) {
return index_record_find(this, t, &engine_cursor);
}
int MessageState::getNext() {
return index_record_next(this, &engine_cursor);
}
int MessageState::getTalker() {
return handler->get_talker(&engine_cursor);
}
int MessageState::getText(char *buffer, int length) {
handler->get_text(&engine_cursor, buffer, length);
return strlen(buffer);
}
int MessageState::getLength() {
char buffer[500];
handler->get_text(&engine_cursor, buffer, sizeof(buffer));
return strlen(buffer);
}
int MessageState::loadRes(int module) {
if (_module == module)
return 1;
_module = module;
current_res = resmgr->findResource(kResourceTypeMessage, module, 0);
if (current_res == NULL || current_res->data == NULL) {
sciprintf("Message subsystem: Failed to load %d.MSG\n", module);
return 0;
}
record_count = handler->index_record_count(current_res->data);
index_records = current_res->data + handler->header_size;
index_record_cursor_initialize(this, &engine_cursor);
return 1;
}
static MessageHandler fixed_handler_old = {
2101,
index_record_parse_2101,
get_talker_trivial,
index_record_get_text_2101,
header_get_index_record_count_2101,
6,
4
};
static MessageHandler fixed_handler = {
3411,
index_record_parse_3411,
index_record_get_talker_3411,
index_record_get_text_3411,
header_get_index_record_count_3411,
10,
11
};
void message_state_initialize(ResourceManager *resmgr, MessageState *state) {
Resource *tester = resmgr->findResource(kResourceTypeMessage, 0, 0);
int version;
if (tester == NULL)
return;
version = READ_LE_UINT16(tester->data);
state->initialized = 1;
state->_module = -1;
state->resmgr = resmgr;
state->current_res = NULL;
state->record_count = 0;
if (version == 2101)
state->handler = &fixed_handler_old;
else
state->handler = &fixed_handler;
}
} // End of namespace Sci
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