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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 "lure/strings.h"
#include "lure/disk.h"
#include "lure/lure.h"
#include "lure/res.h"
#include "lure/room.h"
#include "common/endian.h"
namespace Lure {
StringData *int_strings = NULL;
StringData::StringData() {
int_strings = this;
Disk &disk = Disk::getReference();
for (uint8 ctr = 0; ctr < MAX_NUM_CHARS; ++ctr) _chars[ctr] = NULL;
_numChars = 0;
_names = Disk::getReference().getEntry(NAMES_RESOURCE_ID);
_strings[0] = disk.getEntry(STRINGS_RESOURCE_ID);
_strings[1] = disk.getEntry(STRINGS_2_RESOURCE_ID);
_strings[2] = disk.getEntry(STRINGS_3_RESOURCE_ID);
// Add in the list of bit sequences, and what characters they represent
MemoryBlock *decoderList = disk.getEntry(STRING_DECODER_RESOURCE_ID);
const char *p = (const char *) decoderList->data();
while ((byte)*p != 0xff) {
char ascii = *p++;
add(p, ascii);
p += strlen(p) + 1;
}
delete decoderList;
}
StringData::~StringData() {
int_strings = NULL;
for (uint8 ctr = 0; ctr < MAX_NUM_CHARS; ++ctr)
if (_chars[ctr]) delete _chars[ctr];
else break;
delete _names;
delete _strings[0];
delete _strings[1];
delete _strings[2];
}
StringData &StringData::getReference() {
return *int_strings;
}
void StringData::add(const char *sequence, char ascii) {
uint32 value = 0;
for (uint8 index = 0; index < strlen(sequence); ++index) {
if (sequence[index] == '1')
value |= (1 << index);
else if (sequence[index] != '0')
error("Invalid character in string bit-stream sequence");
}
if (_numChars == MAX_NUM_CHARS)
error("Max characters too lower in string decoder");
_chars[_numChars++] = new CharacterEntry(strlen(sequence), value, ascii);
}
byte StringData::readBit() {
byte result = ((*_srcPos & _bitMask) != 0) ? 1 : 0;
_bitMask >>= 1;
if (_bitMask == 0) {
_bitMask = 0x80;
++_srcPos;
}
return result;
}
bool StringData::initPosition(uint16 stringId) {
uint16 roomNumber = Room::getReference().roomNumber();
byte *stringTable;
if ((roomNumber >= 0x2A) && (stringId >= STRING_ID_RANGE) && (stringId < STRING_ID_UPPER))
stringId = 0x76;
if ((roomNumber < 0x2A) && (stringId >= STRING_ID_UPPER))
stringId = 0x76;
if (stringId < STRING_ID_RANGE)
stringTable = _strings[0]->data();
else if (stringId < STRING_ID_RANGE*2) {
stringId -= STRING_ID_RANGE;
stringTable = _strings[1]->data();
} else {
stringId -= STRING_ID_RANGE * 2;
stringTable = _strings[2]->data();
}
_srcPos = stringTable + 4;
uint32 total = 0;
int numLoops = stringId >> 5;
for (int ctr = 0; ctr < numLoops; ++ctr) {
total += READ_LE_UINT16(_srcPos);
_srcPos += sizeof(uint16);
}
numLoops = stringId & 0x1f;
if (numLoops!= 0) {
byte *tempPtr = stringTable + (stringId & 0xffe0) + READ_LE_UINT16(stringTable);
for (int ctr = 0; ctr < numLoops; ++ctr) {
byte v = *tempPtr++;
if ((v & 0x80) == 0) {
total += v;
} else {
total += (v & 0x7f) << 3;
}
}
}
_bitMask = 0x80;
if ((total & 3) != 0)
_bitMask >>= (total & 3) * 2;
_srcPos = stringTable + (total >> 2) + READ_LE_UINT16(stringTable + 2);
// Final positioning to start of string
for (;;) {
if (readBit() == 0) break;
_srcPos += 2;
}
return readBit() != 0;
}
// readCharatcer
// Reads the next character from the input bit stream
char StringData::readCharacter() {
uint32 searchValue = 0;
// Loop through an increasing number of bits
for (uint8 numBits = 1; numBits <= 18; ++numBits) {
searchValue |= readBit() << (numBits - 1);
// Scan through list for a match
for (int index = 0; _chars[index] != NULL; ++index) {
if ((_chars[index]->_numBits == numBits) &&
(_chars[index]->_sequence == searchValue))
return _chars[index]->_ascii;
}
}
error("Unknown bit sequence encountered when decoding string");
return 0;
}
void StringData::getString(uint16 stringId, char *dest, const char *hotspotName,
const char *characterName, int hotspotArticle, int characterArticle) {
StringList &stringList = Resources::getReference().stringList();
char ch;
strcpy(dest, "");
char *destPos = dest;
stringId &= 0x1fff; // Strip off any article identifier
if (stringId == 0) return;
bool includeArticles = initPosition(stringId);
ch = readCharacter();
while (ch != '\0') {
if (ch == '%') {
// Copy over hotspot or action
ch = readCharacter();
const char *p = (ch == '1') ? hotspotName : characterName;
int article = !includeArticles ? 3 : ((ch == 1) ? hotspotArticle : characterArticle);
if (p != NULL) {
if (article > 0)
strcpy(destPos, stringList.getString(S_ARTICLE_LIST + article - 1));
strcat(destPos, p);
destPos += strlen(destPos);
}
} else if ((uint8) ch >= 0xa0) {
const char *p = getName((uint8) ch - 0xa0);
strcpy(destPos, p);
destPos += strlen(p);
} else {
*destPos++ = ch;
}
ch = readCharacter();
}
*destPos = '\0';
}
// getName
// Returns the name or fragment of word at the specified index in the names resource
char *StringData::getName(uint8 nameIndex) {
uint16 numNames = *((uint16 *) _names->data()) / 2;
if (nameIndex >= numNames)
error("Invalid name index was passed to getCharacterName");
uint16 nameStart = *((uint16 *) (_names->data() + (nameIndex * 2)));
return (char *) (_names->data() + nameStart);
}
} // namespace Lure
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