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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 Ivan Dubrov
* Copyright (C) 2004-2005 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.
*
* $Header$
*
*/
#include "gob/gob.h"
#include "gob/global.h"
#include "gob/dataio.h"
#include "gob/pack.h"
namespace Gob {
DataIO::DataIO(GobEngine *vm) : _vm(vm) {
}
Common::File *DataIO::file_getHandle(int16 handle) {
return &_vm->_global->filesHandles[handle];
}
int16 DataIO::file_open(const char *path, Common::File::AccessMode mode) {
int16 i;
for (i = 0; i < MAX_FILES; i++) {
if (!file_getHandle(i)->isOpen())
break;
}
if (i == MAX_FILES)
return -1;
file_getHandle(i)->open(path, mode);
if (file_getHandle(i)->isOpen())
return i;
return -1;
}
int16 DataIO::getChunk(const char *chunkName) {
int16 file;
int16 slot;
int16 chunk;
struct ChunkDesc *dataDesc;
for (file = 0; file < MAX_DATA_FILES; file++) {
if (_vm->_global->dataFiles[file] == 0)
return -1;
for (slot = 0; slot < MAX_SLOT_COUNT; slot++)
if (_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] == -1)
break;
if (slot == MAX_SLOT_COUNT)
return -1;
dataDesc = _vm->_global->dataFiles[file];
for (chunk = 0; chunk < _vm->_global->numDataChunks[file];
chunk++, dataDesc++) {
if (scumm_stricmp(chunkName, dataDesc->chunkName) != 0)
continue;
_vm->_global->isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 0;
_vm->_global->chunkSize[file * MAX_SLOT_COUNT + slot] =
dataDesc->size;
_vm->_global->chunkOffset[file * MAX_SLOT_COUNT + slot] =
dataDesc->offset;
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] = 0;
return file * 10 + slot + 50;
}
}
return -1;
}
char DataIO::freeChunk(int16 handle) {
if (handle >= 50 && handle < 100) {
handle -= 50;
_vm->_global->chunkPos[(handle / 10) * MAX_SLOT_COUNT + (handle % 10)] = -1;
return 0;
}
return 1;
}
int32 DataIO::readChunk(int16 handle, char *buf, int16 size) {
int16 file;
int16 slot;
int16 i;
int32 offset;
if (handle < 50 || handle >= 100)
return -2;
file = (handle - 50) / 10;
slot = (handle - 50) % 10;
if (_vm->_global->isCurrentSlot[file * MAX_SLOT_COUNT + slot] == 0) {
for (i = 0; i < MAX_SLOT_COUNT; i++)
_vm->_global->isCurrentSlot[file * MAX_SLOT_COUNT + i] = 0;
offset =
_vm->_global->chunkOffset[file * MAX_SLOT_COUNT + slot] +
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot];
debug(7, "seek: %ld, %ld", _vm->_global->chunkOffset[file * MAX_SLOT_COUNT + slot], _vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot]);
file_getHandle(_vm->_global->dataFileHandles[file])->seek(offset, SEEK_SET);
}
_vm->_global->isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 1;
if (_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] + size >
_vm->_global->chunkSize[file * MAX_SLOT_COUNT + slot])
size =
_vm->_global->chunkSize[file * MAX_SLOT_COUNT + slot] -
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot];
file_getHandle(_vm->_global->dataFileHandles[file])->read(buf, size);
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] += size;
return size;
}
int16 DataIO::seekChunk(int16 handle, int32 pos, int16 from) {
int16 file;
int16 slot;
if (handle < 50 || handle >= 100)
return -1;
file = (handle - 50) / 10;
slot = (handle - 50) % 10;
_vm->_global->isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 0;
if (from == SEEK_SET)
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] = pos;
else
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot] += pos;
return _vm->_global->chunkPos[file * MAX_SLOT_COUNT + slot];
}
int32 DataIO::getChunkSize(const char *chunkName) {
int16 file;
int16 chunk;
struct ChunkDesc *dataDesc;
int16 slot;
int32 realSize;
for (file = 0; file < MAX_DATA_FILES; file++) {
if (_vm->_global->dataFiles[file] == 0)
return -1;
dataDesc = _vm->_global->dataFiles[file];
for (chunk = 0; chunk < _vm->_global->numDataChunks[file];
chunk++, dataDesc++) {
if (scumm_stricmp(chunkName, dataDesc->chunkName) != 0)
continue;
if (dataDesc->packed == 0) {
_vm->_global->packedSize = -1;
return dataDesc->size;
}
for (slot = 0; slot < MAX_SLOT_COUNT; slot++)
_vm->_global->isCurrentSlot[slot] = 0;
file_getHandle(_vm->_global->dataFileHandles[file])->seek(dataDesc->offset, SEEK_SET);
realSize = file_getHandle(_vm->_global->dataFileHandles[file])->readUint32LE();
_vm->_global->packedSize = dataDesc->size;
return realSize;
}
}
return -1;
}
void DataIO::openDataFile(const char *src) {
char path[128];
int16 i;
int16 file;
struct ChunkDesc *dataDesc;
strcpy(path, src);
for (i = 0; path[i] != '.' && path[i] != 0; i++);
if (path[i] == 0)
strcat(path, ".stk");
for (file = 0; file < MAX_DATA_FILES; file++)
if (_vm->_global->dataFiles[file] == 0)
break;
if (file == MAX_DATA_FILES)
error("dataFileOpen: Data file slots are full\n");
_vm->_global->dataFileHandles[file] = file_open(path);
if (_vm->_global->dataFileHandles[file] == -1)
error("dataFileOpen: Can't open %s data file\n", path);
_vm->_global->numDataChunks[file] = file_getHandle(_vm->_global->dataFileHandles[file])->readUint16LE();
debug(7, "DataChunks: %d [for %s]", _vm->_global->numDataChunks[file], path);
_vm->_global->dataFiles[file] = dataDesc =
(struct ChunkDesc *)malloc(sizeof(struct ChunkDesc) *
_vm->_global->numDataChunks[file]);
for (i = 0; i < _vm->_global->numDataChunks[file]; i++) {
file_getHandle(_vm->_global->dataFileHandles[file])->read(dataDesc[i].chunkName, 13);
dataDesc[i].size = file_getHandle(_vm->_global->dataFileHandles[file])->readUint32LE();
dataDesc[i].offset = file_getHandle(_vm->_global->dataFileHandles[file])->readUint32LE();
dataDesc[i].packed = file_getHandle(_vm->_global->dataFileHandles[file])->readByte();
}
for (i = 0; i < _vm->_global->numDataChunks[file]; i++)
debug(7, "%d: %s %d", i, dataDesc[i].chunkName, dataDesc[i].size);
for (i = 0; i < MAX_SLOT_COUNT; i++)
_vm->_global->chunkPos[file * MAX_SLOT_COUNT + i] = -1;
}
void DataIO::closeDataFile() {
int16 file;
for (file = MAX_DATA_FILES - 1; file >= 0; file--) {
if (_vm->_global->dataFiles[file] != 0) {
free(_vm->_global->dataFiles[file]);
_vm->_global->dataFiles[file] = 0;
file_getHandle(_vm->_global->dataFileHandles[file])->close();
return;
}
}
}
char *DataIO::getUnpackedData(const char *name) {
int32 realSize;
int16 chunk;
char *unpackBuf;
char *packBuf;
char *ptr;
int32 sizeLeft;
realSize = getChunkSize(name);
if (_vm->_global->packedSize == -1 || realSize == -1)
return 0;
chunk = getChunk(name);
if (chunk == -1)
return 0;
unpackBuf = (char *)malloc(realSize);
if (unpackBuf == 0)
return 0;
packBuf = (char *)malloc(_vm->_global->packedSize);
if (packBuf == 0) {
free(unpackBuf);
return 0;
}
sizeLeft = _vm->_global->packedSize;
ptr = packBuf;
while (sizeLeft > 0x4000) {
readChunk(chunk, ptr, 0x4000);
sizeLeft -= 0x4000;
ptr += 0x4000;
}
readChunk(chunk, ptr, sizeLeft);
freeChunk(chunk);
_vm->_pack->unpackData(packBuf, unpackBuf);
free(packBuf);
return unpackBuf;
}
void DataIO::closeData(int16 handle) {
if (freeChunk(handle) != 0)
file_getHandle(handle)->close();
}
int16 DataIO::openData(const char *path, Common::File::AccessMode mode) {
int16 handle;
if (mode != Common::File::kFileReadMode)
return file_open(path, mode);
handle = getChunk(path);
if (handle >= 0)
return handle;
return file_open(path, mode);
}
int32 DataIO::readData(int16 handle, char *buf, int16 size) {
int32 res;
res = readChunk(handle, buf, size);
if (res >= 0)
return res;
return file_getHandle(handle)->read(buf, size);
}
void DataIO::seekData(int16 handle, int32 pos, int16 from) {
int32 resPos;
resPos = seekChunk(handle, pos, from);
if (resPos != -1)
return;
file_getHandle(handle)->seek(pos, from);
}
int32 DataIO::getDataSize(const char *name) {
char buf[128];
int32 chunkSz;
Common::File file;
strcpy(buf, name);
chunkSz = getChunkSize(buf);
if (chunkSz >= 0)
return chunkSz;
if (!file.open(buf))
error("getDataSize: Can't find data(%s)", name);
chunkSz = file.size();
file.close();
return chunkSz;
}
char *DataIO::getData(const char *path) {
char *data;
char *ptr;
int32 size;
int16 handle;
data = getUnpackedData(path);
if (data != 0)
return data;
size = getDataSize(path);
data = (char *)malloc(size);
if (data == 0)
return 0;
handle = openData(path);
ptr = data;
while (size > 0x4000) {
readData(handle, ptr, 0x4000);
size -= 0x4000;
ptr += 0x4000;
}
readData(handle, ptr, size);
closeData(handle);
return data;
}
} // End of namespace Gob
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