From 0198e51fa35a8ac17fa4f345296574fd9cf45d7b Mon Sep 17 00:00:00 2001
From: Choupom <andycootlapin@hotmail.fr>
Date: Fri, 3 Sep 2010 21:17:32 +0200
Subject: [PATCH] made demo readable for custom map that user doesn't have (#5)

---
 src/base/system.c             |  2 +-
 src/base/system.h             |  2 +-
 src/engine/shared/demorec.cpp | 78 +++++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+), 2 deletions(-)

diff --git a/src/base/system.c b/src/base/system.c
index 6c735c28b..5f4f9d0da 100644
--- a/src/base/system.c
+++ b/src/base/system.c
@@ -289,7 +289,7 @@ unsigned io_read(IOHANDLE io, void *buffer, unsigned size)
 	return fread(buffer, 1, size, (FILE*)io);
 }
 
-unsigned io_skip(IOHANDLE io, unsigned size)
+unsigned io_skip(IOHANDLE io, int size)
 {
 	fseek((FILE*)io, size, SEEK_CUR);
 	return size;
diff --git a/src/base/system.h b/src/base/system.h
index c49fbdadf..1b4d52aa7 100644
--- a/src/base/system.h
+++ b/src/base/system.h
@@ -222,7 +222,7 @@ unsigned io_read(IOHANDLE io, void *buffer, unsigned size);
 	Returns:
 		Number of bytes skipped.
 */
-unsigned io_skip(IOHANDLE io, unsigned size);
+unsigned io_skip(IOHANDLE io, int size);
 
 /*
 	Function: io_write
diff --git a/src/engine/shared/demorec.cpp b/src/engine/shared/demorec.cpp
index 23da24785..ce390f828 100644
--- a/src/engine/shared/demorec.cpp
+++ b/src/engine/shared/demorec.cpp
@@ -10,6 +10,8 @@
 #include "engine.h"
 
 static const unsigned char gs_aHeaderMarker[8] = {'T', 'W', 'D', 'E', 'M', 'O', 0, 1};
+static const unsigned char gs_aMapMarker[5] = {'M', 'A', 'P', 0, 1};
+
 
 CDemoRecorder::CDemoRecorder(class CSnapshotDelta *pSnapshotDelta)
 {
@@ -50,6 +52,38 @@ int CDemoRecorder::Start(class IStorage *pStorage, class IConsole *pConsole, con
 	Header.m_aCrc[3] = (Crc)&0xff;
 	io_write(m_File, &Header, sizeof(Header));
 	
+	
+	// write map
+	char aMapFilename[128];
+	str_format(aMapFilename, sizeof(aMapFilename), "downloadedmaps/%s_%08x.map", pMap, Crc);
+	IOHANDLE MapFile = pStorage->OpenFile(aMapFilename, IOFLAG_READ);
+	if(MapFile)
+	{
+		// write map marker
+		io_write(m_File, &gs_aMapMarker, sizeof(gs_aMapMarker));
+		
+		// write map size
+		int MapSize = io_length(MapFile);
+		unsigned char aBufMapSize[4];
+		aBufMapSize[0] = (MapSize>>24)&0xff;
+		aBufMapSize[1] = (MapSize>>16)&0xff;
+		aBufMapSize[2] = (MapSize>>8)&0xff;
+		aBufMapSize[3] = (MapSize)&0xff;
+		io_write(m_File, &aBufMapSize, sizeof(aBufMapSize));
+		
+		// write map data
+		while(1)
+		{
+			unsigned char aChunk[1024*64];
+			int Bytes = io_read(MapFile, &aChunk, sizeof(aChunk));
+			if(Bytes <= 0)
+				break;
+			io_write(m_File, &aChunk, Bytes);
+		}
+		io_close(MapFile);
+	}
+	
+	
 	m_LastKeyFrame = -1;
 	m_LastTickMarker = -1;
 	
@@ -498,6 +532,50 @@ int CDemoPlayer::Load(class IStorage *pStorage, class IConsole *pConsole, const
 		return -1;
 	}
 	
+	
+	// check if the demo includes a map
+	unsigned char aMapMarker[5];
+	io_read(m_File, &aMapMarker, sizeof(aMapMarker));
+	
+	if(mem_comp(aMapMarker, gs_aMapMarker, sizeof(gs_aMapMarker)) == 0)
+	{
+		// get map size
+		unsigned char aBufMapSize[4];
+		io_read(m_File, &aBufMapSize, sizeof(aBufMapSize));
+		int MapSize = (aBufMapSize[0]<<24) | (aBufMapSize[1]<<16) | (aBufMapSize[2]<<8) | (aBufMapSize[3]);
+		
+		// check if we already have the map
+		int Crc = (m_Info.m_Header.m_aCrc[0]<<24) | (m_Info.m_Header.m_aCrc[1]<<16) | (m_Info.m_Header.m_aCrc[2]<<8) | (m_Info.m_Header.m_aCrc[3]);
+		char aMapFilename[128];
+		str_format(aMapFilename, sizeof(aMapFilename), "downloadedmaps/%s_%08x.map", m_Info.m_Header.m_aMap, Crc);
+		IOHANDLE MapFile = pStorage->OpenFile(aMapFilename, IOFLAG_READ);
+		
+		if(MapFile)
+		{
+			io_skip(m_File, MapSize);
+			io_close(MapFile);
+		}
+		else if(MapSize != 0)
+		{
+			// get map data
+			unsigned char *pMapData = (unsigned char *)mem_alloc(MapSize, 1);
+			io_read(m_File, pMapData, MapSize);
+			
+			// save map
+			MapFile = pStorage->OpenFile(aMapFilename, IOFLAG_WRITE);
+			io_write(MapFile, pMapData, MapSize);
+			io_close(MapFile);
+			
+			// free data
+			mem_free(pMapData);
+		}
+	}
+	else // no map in the demo
+	{
+		io_skip(m_File, -sizeof(aMapMarker));
+	}
+	
+	
 	// scan the file for interessting points
 	ScanFile();