aboutsummaryrefslogtreecommitdiff
path: root/engines/tinsel/handle.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'engines/tinsel/handle.cpp')
-rw-r--r--engines/tinsel/handle.cpp366
1 files changed, 366 insertions, 0 deletions
diff --git a/engines/tinsel/handle.cpp b/engines/tinsel/handle.cpp
new file mode 100644
index 0000000000..610f23012f
--- /dev/null
+++ b/engines/tinsel/handle.cpp
@@ -0,0 +1,366 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ * This file contains the handle based Memory Manager code
+ */
+
+#define BODGE
+
+#include "common/file.h"
+
+#include "tinsel/dw.h"
+#include "tinsel/scn.h" // name of "index" file
+#include "tinsel/handle.h"
+#include "tinsel/heapmem.h" // heap memory manager
+
+
+// these are included only so the relevant structs can be used in convertLEStructToNative()
+#include "tinsel/anim.h"
+#include "tinsel/multiobj.h"
+#include "tinsel/film.h"
+#include "tinsel/object.h"
+#include "tinsel/palette.h"
+#include "tinsel/text.h"
+#include "tinsel/scene.h"
+
+namespace Tinsel {
+
+//----------------- EXTERNAL GLOBAL DATA --------------------
+
+#ifdef DEBUG
+bool bLockedScene = 0;
+#endif
+
+
+//----------------- LOCAL DEFINES --------------------
+
+struct MEMHANDLE {
+ char szName[12]; //!< 00 - file name of graphics file
+ int32 filesize; //!< 12 - file size and flags
+ PMEM_NODE pNode; //!< 16 - memory node for the graphics
+};
+
+
+/** memory allocation flags - stored in the top bits of the filesize field */
+enum {
+ fPreload = 0x01000000L, //!< preload memory
+ fDiscard = 0x02000000L, //!< discard memory
+ fSound = 0x04000000L, //!< sound data
+ fGraphic = 0x08000000L, //!< graphic data
+ fCompressed = 0x10000000L, //!< compressed data
+ fLoaded = 0x20000000L //!< set when file data has been loaded
+};
+#define FSIZE_MASK 0x00FFFFFFL //!< mask to isolate the filesize
+#define MALLOC_MASK 0xFF000000L //!< mask to isolate the memory allocation flags
+#define OFFSETMASK 0x007fffffL //!< get offset of address
+//#define HANDLEMASK 0xFF800000L //!< get handle of address
+
+//----------------- LOCAL GLOBAL DATA --------------------
+
+// handle table gets loaded from index file at runtime
+static MEMHANDLE *handleTable = 0;
+
+// number of handles in the handle table
+static uint numHandles = 0;
+
+
+//----------------- FORWARD REFERENCES --------------------
+
+static void LoadFile(MEMHANDLE *pH, bool bWarn); // load a memory block as a file
+
+
+/**
+ * Loads the graphics handle table index file and preloads all the
+ * permanent graphics etc.
+ */
+void SetupHandleTable(void) {
+ enum { RECORD_SIZE = 20 };
+
+ int len;
+ uint i;
+ MEMHANDLE *pH;
+ Common::File f;
+
+ if (f.open(INDEX_FILENAME)) {
+ // get size of index file
+ len = f.size();
+
+ if (len > 0) {
+ if ((len % RECORD_SIZE) != 0) {
+ // index file is corrupt
+ error("File %s is corrupt", INDEX_FILENAME);
+ }
+
+ // calc number of handles
+ numHandles = len / RECORD_SIZE;
+
+ // allocate memory for the index file
+ handleTable = (MEMHANDLE *)calloc(numHandles, sizeof(struct MEMHANDLE));
+
+ // make sure memory allocated
+ assert(handleTable);
+
+ // load data
+ for (i = 0; i < numHandles; i++) {
+ f.read(handleTable[i].szName, 12);
+ handleTable[i].filesize = f.readUint32LE();
+ // The pointer should always be NULL. We don't
+ // need to read that from the file.
+ handleTable[i].pNode = NULL;
+ f.seek(4, SEEK_CUR);
+ }
+
+ if (f.ioFailed()) {
+ // index file is corrupt
+ error("File %s is corrupt", INDEX_FILENAME);
+ }
+
+ // close the file
+ f.close();
+ } else { // index file is corrupt
+ error("File %s is corrupt", INDEX_FILENAME);
+ }
+ } else { // cannot find the index file
+ error("Cannot find file %s", INDEX_FILENAME);
+ }
+
+ // allocate memory nodes and load all permanent graphics
+ for (i = 0, pH = handleTable; i < numHandles; i++, pH++) {
+ if (pH->filesize & fPreload) {
+ // allocate a fixed memory node for permanent files
+ pH->pNode = MemoryAlloc(DWM_FIXED, pH->filesize & FSIZE_MASK);
+
+ // make sure memory allocated
+ assert(pH->pNode);
+
+ // load the data
+ LoadFile(pH, true);
+ }
+#ifdef BODGE
+ else if ((pH->filesize & FSIZE_MASK) == 8) {
+ pH->pNode = NULL;
+ }
+#endif
+ else {
+ // allocate a discarded memory node for other files
+ pH->pNode = MemoryAlloc(
+ DWM_MOVEABLE | DWM_DISCARDABLE | DWM_NOALLOC,
+ pH->filesize & FSIZE_MASK);
+
+ // make sure memory allocated
+ assert(pH->pNode);
+ }
+ }
+}
+
+void FreeHandleTable(void) {
+ if (handleTable) {
+ free(handleTable);
+ handleTable = NULL;
+ }
+}
+
+/**
+ * Loads a memory block as a file.
+ * @param pH Memory block pointer
+ * @param bWarn If set, treat warnings as errors
+ */
+void LoadFile(MEMHANDLE *pH, bool bWarn) {
+ Common::File f;
+ char szFilename[sizeof(pH->szName) + 1];
+
+ if (pH->filesize & fCompressed) {
+ error("Compression handling has been removed!");
+ }
+
+ // extract and zero terminate the filename
+ strncpy(szFilename, pH->szName, sizeof(pH->szName));
+ szFilename[sizeof(pH->szName)] = 0;
+
+ if (f.open(szFilename)) {
+ // read the data
+ int bytes;
+ uint8 *addr;
+
+ if (pH->filesize & fPreload)
+ // preload - no need to lock the memory
+ addr = (uint8 *)pH->pNode;
+ else {
+ // discardable - lock the memory
+ addr = (uint8 *)MemoryLock(pH->pNode);
+ }
+#ifdef DEBUG
+ if (addr == NULL) {
+ if (pH->filesize & fPreload)
+ // preload - no need to lock the memory
+ addr = (uint8 *)pH->pNode;
+ else {
+ // discardable - lock the memory
+ addr = (uint8 *)MemoryLock(pH->pNode);
+ }
+ }
+#endif
+
+ // make sure address is valid
+ assert(addr);
+
+ bytes = f.read(addr, pH->filesize & FSIZE_MASK);
+
+ // close the file
+ f.close();
+
+ if ((pH->filesize & fPreload) == 0) {
+ // discardable - unlock the memory
+ MemoryUnlock(pH->pNode);
+ }
+
+ // set the loaded flag
+ pH->filesize |= fLoaded;
+
+ if (bytes == (pH->filesize & FSIZE_MASK)) {
+ return;
+ }
+
+ if (bWarn)
+ // file is corrupt
+ error("File %s is corrupt", szFilename);
+ }
+
+ if (bWarn)
+ // cannot find file
+ error("Cannot find file %s", szFilename);
+}
+
+/**
+ * Returns the address of a image, given its memory handle.
+ * @param offset Handle and offset to data
+ */
+uint8 *LockMem(SCNHANDLE offset) {
+ uint32 handle = offset >> SCNHANDLE_SHIFT; // calc memory handle to use
+ MEMHANDLE *pH; // points to table entry
+
+ // range check the memory handle
+ assert(handle < numHandles);
+
+ pH = handleTable + handle;
+
+ if (pH->filesize & fPreload) {
+ // permanent files are already loaded
+ return (uint8 *)pH->pNode + (offset & OFFSETMASK);
+ } else {
+ if (pH->pNode->pBaseAddr && (pH->filesize & fLoaded))
+ // already allocated and loaded
+ return pH->pNode->pBaseAddr + (offset & OFFSETMASK);
+
+ if (pH->pNode->pBaseAddr == NULL)
+ // must have been discarded - reallocate the memory
+ MemoryReAlloc(pH->pNode, pH->filesize & FSIZE_MASK,
+ DWM_MOVEABLE | DWM_DISCARDABLE);
+
+ if (pH->pNode->pBaseAddr == NULL)
+ error("Out of memory");
+
+ LoadFile(pH, true);
+
+ // make sure address is valid
+ assert(pH->pNode->pBaseAddr);
+
+ return pH->pNode->pBaseAddr + (offset & OFFSETMASK);
+ }
+}
+
+/**
+ * Called to make the current scene non-discardable.
+ * @param offset Handle and offset to data
+ */
+void LockScene(SCNHANDLE offset) {
+
+ uint32 handle = offset >> SCNHANDLE_SHIFT; // calc memory handle to use
+ MEMHANDLE *pH; // points to table entry
+
+#ifdef DEBUG
+ assert(!bLockedScene); // Trying to lock more than one scene
+#endif
+
+ // range check the memory handle
+ assert(handle < numHandles);
+
+ pH = handleTable + handle;
+
+ // compact the heap to avoid fragmentation while scene is non-discardable
+ HeapCompact(MAX_INT, false);
+
+ if ((pH->filesize & fPreload) == 0) {
+ // change the flags for the node
+ MemoryReAlloc(pH->pNode, pH->filesize & FSIZE_MASK, DWM_MOVEABLE);
+#ifdef DEBUG
+ bLockedScene = true;
+#endif
+ }
+}
+
+/**
+ * Called to make the current scene discardable again.
+ * @param offset Handle and offset to data
+ */
+void UnlockScene(SCNHANDLE offset) {
+
+ uint32 handle = offset >> SCNHANDLE_SHIFT; // calc memory handle to use
+ MEMHANDLE *pH; // points to table entry
+
+ // range check the memory handle
+ assert(handle < numHandles);
+
+ pH = handleTable + handle;
+
+ if ((pH->filesize & fPreload) == 0) {
+ // change the flags for the node
+ MemoryReAlloc(pH->pNode, pH->filesize & FSIZE_MASK, DWM_MOVEABLE | DWM_DISCARDABLE);
+#ifdef DEBUG
+ bLockedScene = false;
+#endif
+ }
+}
+
+/*----------------------------------------------------------------------*/
+
+#ifdef BODGE
+
+/**
+ * Validates that a specified handle pointer is valid
+ * @param offset Handle and offset to data
+ */
+bool ValidHandle(SCNHANDLE offset) {
+ uint32 handle = offset >> SCNHANDLE_SHIFT; // calc memory handle to use
+ MEMHANDLE *pH; // points to table entry
+
+ // range check the memory handle
+ assert(handle < numHandles);
+
+ pH = handleTable + handle;
+
+ return (pH->filesize & FSIZE_MASK) != 8;
+}
+#endif
+
+} // end of namespace Tinsel