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dataio.cpp

/* 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: /cvsroot/scummvm/scummvm/gob/dataio.cpp,v 1.9.2.1 2005/10/18 02:11:18 sev Exp $
 *
 */
#include "gob/gob.h"
#include "gob/global.h"
#include "gob/dataio.h"
#include "gob/pack.h"

namespace Gob {

int16 file_write(int16 handle, char *buf, int16 size) {
      return filesHandles[handle].write(buf, size);
}

int16 file_open(const char *path, Common::File::AccessMode mode) {
      int16 i;

      for (i = 0; i < MAX_FILES; i++) {
            if (!filesHandles[i].isOpen())
                  break;
      }
      if (i == MAX_FILES)
            return -1;

      filesHandles[i].open(path, mode);

      if (filesHandles[i].isOpen())
            return i;

      return -1;
}

Common::File *file_getHandle(int16 handle) {
      return &filesHandles[handle];
}

int16 data_getChunk(const char *chunkName) {
      int16 file;
      int16 slot;
      int16 chunk;
      struct ChunkDesc *dataDesc;

      for (file = 0; file < MAX_DATA_FILES; file++) {
            if (dataFiles[file] == 0)
                  return -1;

            for (slot = 0; slot < MAX_SLOT_COUNT; slot++)
                  if (chunkPos[file * MAX_SLOT_COUNT + slot] == -1)
                        break;

            if (slot == MAX_SLOT_COUNT)
                  return -1;

            dataDesc = dataFiles[file];
            for (chunk = 0; chunk < numDataChunks[file];
                chunk++, dataDesc++) {
                  if (scumm_stricmp(chunkName, dataDesc->chunkName) != 0)
                        continue;

                  isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 0;
                  chunkSize[file * MAX_SLOT_COUNT + slot] =
                      dataDesc->size;
                  chunkOffset[file * MAX_SLOT_COUNT + slot] =
                      dataDesc->offset;
                  chunkPos[file * MAX_SLOT_COUNT + slot] = 0;
                  return file * 10 + slot + 50;
            }
      }
      return -1;
}

char data_freeChunk(int16 handle) {
      if (handle >= 50 && handle < 100) {
            handle -= 50;
            chunkPos[(handle / 10) * MAX_SLOT_COUNT + (handle % 10)] = -1;
            return 0;
      }
      return 1;
}

int32 data_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 (isCurrentSlot[file * MAX_SLOT_COUNT + slot] == 0) {
            for (i = 0; i < MAX_SLOT_COUNT; i++)
                  isCurrentSlot[file * MAX_SLOT_COUNT + i] = 0;

            offset =
                chunkOffset[file * MAX_SLOT_COUNT + slot] +
                chunkPos[file * MAX_SLOT_COUNT + slot];
            debug(7, "seek: %ld, %ld", chunkOffset[file * MAX_SLOT_COUNT + slot], chunkPos[file * MAX_SLOT_COUNT + slot]);
            file_getHandle(dataFileHandles[file])->seek(offset, SEEK_SET);
      }

      isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 1;
      if (chunkPos[file * MAX_SLOT_COUNT + slot] + size >
          chunkSize[file * MAX_SLOT_COUNT + slot])
            size =
                chunkSize[file * MAX_SLOT_COUNT + slot] -
                chunkPos[file * MAX_SLOT_COUNT + slot];

      file_getHandle(dataFileHandles[file])->read(buf, size);
      chunkPos[file * MAX_SLOT_COUNT + slot] += size;
      return size;
}

int16 data_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;
      isCurrentSlot[file * MAX_SLOT_COUNT + slot] = 0;
      if (from == SEEK_SET)
            chunkPos[file * MAX_SLOT_COUNT + slot] = pos;
      else
            chunkPos[file * MAX_SLOT_COUNT + slot] += pos;

      return chunkPos[file * MAX_SLOT_COUNT + slot];
}

int32 data_getChunkSize(const char *chunkName) {
      int16 file;
      int16 chunk;
      struct ChunkDesc *dataDesc;
      int16 slot;
      int32 realSize;

      for (file = 0; file < MAX_DATA_FILES; file++) {
            if (dataFiles[file] == 0)
                  return -1;

            dataDesc = dataFiles[file];
            for (chunk = 0; chunk < numDataChunks[file];
                chunk++, dataDesc++) {
                  if (scumm_stricmp(chunkName, dataDesc->chunkName) != 0)
                        continue;

                  if (dataDesc->packed == 0) {
                        packedSize = -1;
                        return dataDesc->size;
                  }

                  for (slot = 0; slot < MAX_SLOT_COUNT; slot++)
                        isCurrentSlot[slot] = 0;

                  file_getHandle(dataFileHandles[file])->seek(dataDesc->offset, SEEK_SET);
                  realSize = file_getHandle(dataFileHandles[file])->readUint32LE();
                  packedSize = dataDesc->size;
                  return realSize;
            }
      }
      return -1;
}

void data_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 (dataFiles[file] == 0)
                  break;

      if (file == MAX_DATA_FILES)
            error("data_dataFileOpen: Data file slots are full\n");
      dataFileHandles[file] = file_open(path);

      if (dataFileHandles[file] == -1)
            error("data_dataFileOpen: Can't open %s data file\n", path);

      numDataChunks[file] = file_getHandle(dataFileHandles[file])->readUint16LE();

      debug(7, "DataChunks: %d [for %s]", numDataChunks[file], path);

      dataFiles[file] = dataDesc =
          (struct ChunkDesc *)malloc(sizeof(struct ChunkDesc) *
          numDataChunks[file]);

      for (i = 0; i < numDataChunks[file]; i++) {
            file_getHandle(dataFileHandles[file])->read(dataDesc[i].chunkName, 13);
            dataDesc[i].size = file_getHandle(dataFileHandles[file])->readUint32LE();
            dataDesc[i].offset = file_getHandle(dataFileHandles[file])->readUint32LE();
            dataDesc[i].packed = file_getHandle(dataFileHandles[file])->readByte();
      }

      for (i = 0; i < numDataChunks[file]; i++)
            debug(7, "%d: %s %d", i, dataDesc[i].chunkName, dataDesc[i].size);

      for (i = 0; i < MAX_SLOT_COUNT; i++)
            chunkPos[file * MAX_SLOT_COUNT + i] = -1;

}

void data_closeDataFile() {
      int16 file;
      for (file = MAX_DATA_FILES - 1; file >= 0; file--) {
            if (dataFiles[file] != 0) {
                  free(dataFiles[file]);
                  dataFiles[file] = 0;
                  file_getHandle(dataFileHandles[file])->close();
                  return;
            }
      }
}

char *data_getUnpackedData(const char *name) {
      int32 realSize;
      int16 chunk;
      char *unpackBuf;
      char *packBuf;
      char *ptr;
      int32 sizeLeft;

      realSize = data_getChunkSize(name);
      if (packedSize == -1 || realSize == -1)
            return 0;

      chunk = data_getChunk(name);
      if (chunk == -1)
            return 0;

      unpackBuf = (char *)malloc(realSize);
      if (unpackBuf == 0)
            return 0;

      packBuf = (char *)malloc(packedSize);
      if (packBuf == 0) {
            free(unpackBuf);
            return 0;
      }

      sizeLeft = packedSize;
      ptr = packBuf;
      while (sizeLeft > 0x4000) {
            data_readChunk(chunk, ptr, 0x4000);
            sizeLeft -= 0x4000;
            ptr += 0x4000;
      }
      data_readChunk(chunk, ptr, sizeLeft);
      data_freeChunk(chunk);
      unpackData(packBuf, unpackBuf);
      free(packBuf);
      return unpackBuf;
}

void data_closeData(int16 handle) {
      if (data_freeChunk(handle) != 0)
            file_getHandle(handle)->close();
}

int16 data_openData(const char *path, Common::File::AccessMode mode) {
      int16 handle;

      if (mode != Common::File::kFileReadMode)
            return file_open(path, mode);

      handle = data_getChunk(path);
      if (handle >= 0)
            return handle;

      return file_open(path, mode);
}

int32 data_readData(int16 handle, char *buf, int16 size) {
      int32 res;

      res = data_readChunk(handle, buf, size);
      if (res >= 0)
            return res;

      return file_getHandle(handle)->read(buf, size);
}

void data_seekData(int16 handle, int32 pos, int16 from) {
      int32 resPos;

      resPos = data_seekChunk(handle, pos, from);
      if (resPos != -1)
            return;

      file_getHandle(handle)->seek(pos, from);
}

int32 data_getDataSize(const char *name) {
      char buf[128];
      int32 chunkSz;
      Common::File file;

      strcpy(buf, name);
      chunkSz = data_getChunkSize(buf);
      if (chunkSz >= 0)
            return chunkSz;

      if (!file.open(buf))
            error("data_getDataSize: Can't find data(%s)", name);

      chunkSz = file.size();
      file.close();

      return chunkSz;
}

char *data_getData(const char *path) {
      char *data;
      char *ptr;
      int32 size;
      int16 handle;

      data = data_getUnpackedData(path);
      if (data != 0)
            return data;

      size = data_getDataSize(path);
      data = (char *)malloc(size);
      if (data == 0)
            return 0;

      handle = data_openData(path);

      ptr = data;
      while (size > 0x4000) {
            data_readData(handle, ptr, 0x4000);
            size -= 0x4000;
            ptr += 0x4000;
      }
      data_readData(handle, ptr, size);
      data_closeData(handle);
      return data;
}

char *data_getSmallData(const char *path) {
      return data_getData(path);
}

}                       // End of namespace Gob

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