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/* ScummVM - Scumm Interpreter
* Copyright (C) 2005-2006 The ScummVM project
*
* 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/res.h"
#include "lure/room.h"
#include "common/endian.h"
namespace Lure {
StringData *int_strings = NULL;
StringData::StringData() {
int_strings = this;
for (uint8 ctr = 0; ctr < MAX_NUM_CHARS; ++ctr) _chars[ctr] = NULL;
_numChars = 0;
_names = Disk::getReference().getEntry(NAMES_RESOURCE_ID);
_strings[0] = Disk::getReference().getEntry(STRINGS_RESOURCE_ID);
_strings[1] = Disk::getReference().getEntry(STRINGS_2_RESOURCE_ID);
_strings[2] = Disk::getReference().getEntry(STRINGS_3_RESOURCE_ID);
// Add in the list of bit sequences, and what characters they represent
add("00", ' ');
add("0100", 'e');
add("0101", 'o');
add("0110", 't');
add("01110", 'a');
add("01111", 'n');
add("1000", 's');
add("1001", 'i');
add("1010", 'r');
add("10110", 'h');
add("101110", 'u');
add("1011110", 'l');
add("1011111", 'd');
add("11000", 'y');
add("110010", 'g');
add("110011", '\0');
add("110100", 'w');
add("110101", 'c');
add("110110", 'f');
add("1101110", '.');
add("1101111", 'm');
add("111000", 'p');
add("111001", 'b');
add("1110100", ',');
add("1110101", 'k');
add("1110110", '\'');
add("11101110", 'I');
add("11101111", 'v');
add("1111000", '!');
add("1111001", '\xb4');
add("11110100", 'T');
add("11110101", '\xb5');
add("11110110", '?');
add("111101110", '\xb2');
add("111101111", '\xb3');
add("11111000", 'W');
add("111110010", 'H');
add("111110011", 'A');
add("111110100", '\xb1');
add("111110101", 'S');
add("111110110", 'Y');
add("1111101110", 'G');
add("11111011110", 'M');
add("11111011111", 'N');
add("111111000", 'O');
add("1111110010", 'E');
add("1111110011", 'L');
add("1111110100", '-');
add("1111110101", 'R');
add("1111110110", 'B');
add("11111101110", 'D');
add("11111101111", '\xa6');
add("1111111000", 'C');
add("11111110010", 'x');
add("11111110011", 'j');
add("1111111010", '\xac');
add("11111110110", '\xa3');
add("111111101110", 'P');
add("111111101111", 'U');
add("11111111000", 'q');
add("11111111001", '\xad');
add("111111110100", 'F');
add("111111110101", '1');
add("111111110110", '\xaf');
add("1111111101110", ';');
add("1111111101111", 'z');
add("111111111000", '\xa5');
add("1111111110010", '2');
add("1111111110011", '\xb0');
add("111111111010", 'K');
add("1111111110110", '%');
add("11111111101110", '\xa2');
add("11111111101111", '5');
add("1111111111000", ':');
add("1111111111001", 'J');
add("1111111111010", 'V');
add("11111111110110", '6');
add("11111111110111", '3');
add("1111111111100", '\xab');
add("11111111111010", '\xae');
add("111111111110110", '0');
add("111111111110111", '4');
add("11111111111100", '7');
add("111111111111010", '9');
add("111111111111011", '"');
add("111111111111100", '8');
add("111111111111101", '\xa7');
add("1111111111111100", '/');
add("1111111111111101", 'Q');
add("11111111111111100", '\xa8');
add("11111111111111101", '(');
add("111111111111111100", ')');
add("111111111111111101", '\x99');
add("11111111111111111", '\xa9');
}
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;
}
void 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;
}
readBit();
}
// 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) {
char ch;
strcpy(dest, "");
char *destPos = dest;
stringId &= 0x1fff; // Strip off any article identifier
if (stringId == 0) return;
initPosition(stringId);
ch = readCharacter();
while (ch != '\0') {
if (ch == '%') {
// Copy over hotspot or action
ch = readCharacter();
const char *p = (ch == '1') ? hotspotName : characterName;
strcpy(destPos, p);
destPos += strlen(p);
} 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);
}
// getStringWithArticle
// Fills a buffer with the string specified by a given string Id with a definite article prefix
void StringData::getStringWithArticle(uint16 stringId, char *dest) {
const char *articles[4] = {"the ", "a ", "an ", ""};
strcpy(dest, articles[stringId >> 14]);
getString(stringId, dest + strlen(dest));
}
} // namespace Lure
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