Add third_party to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 731 insertions, 0 deletions

diff --git a/third_party/bsdiff/LICENSE b/third_party/bsdiff/LICENSE
new file mode 100644
index 0000000..c146b5b
--- /dev/null
+++ b/third_party/bsdiff/LICENSE
@@ -0,0 +1,121 @@
+BSD Protection License
+February 2002
+
+Preamble
+--------
+
+The Berkeley Software Distribution ("BSD") license has proven very effective
+over the years at allowing for a wide spread of work throughout both
+commercial and non-commercial products.  For programmers whose primary
+intention is to improve the general quality of available software, it is
+arguable that there is no better license than the BSD license, as it
+permits improvements to be used wherever they will help, without idealogical
+or metallic constraint.
+
+This is of particular value to those who produce reference implementations
+of proposed standards: The case of TCP/IP clearly illustrates that freely
+and universally available implementations leads the rapid acceptance of
+standards -- often even being used instead of a de jure standard (eg, OSI
+network models).
+
+With the rapid proliferation of software licensed under the GNU General
+Public License, however, the continued success of this role is called into
+question.  Given that the inclusion of a few lines of "GPL-tainted" work
+into a larger body of work will result in restricted distribution -- and
+given that further work will likely build upon the "tainted" portions,
+making them difficult to remove at a future date -- there are inevitable
+circumstances where authors would, in order to protect their goal of
+providing for the widespread usage of their work, wish to guard against
+such "GPL-taint".
+
+In addition, one can imagine that companies which operate by producing and
+selling (possibly closed-source) code would wish to protect themselves
+against the rise of a GPL-licensed competitor.  While under existing
+licenses this would mean not releasing their code under any form of open
+license, if a license existed under which they could incorporate any
+improvements back into their own (commercial) products then they might be
+far more willing to provide for non-closed distribution.
+
+For the above reasons, we put forth this "BSD Protection License": A
+license designed to retain the freedom granted by the BSD license to use
+licensed works in a wide variety of settings, both non-commercial and
+commercial, while protecting the work from having future contributors
+restrict that freedom.
+
+The precise terms and conditions for copying, distribution, and
+modification follow.
+
+BSD PROTECTION LICENSE
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION, AND MODIFICATION
+----------------------------------------------------------------
+
+0. Definitions.
+   a) "Program", below, refers to any program or work distributed under
+      the terms of this license.
+   b) A "work based on the Program", below, refers to either the Program
+      or any derivative work under copyright law.
+   c) "Modification", below, refers to the act of creating derivative works.
+   d) "You", below, refers to each licensee.
+
+1. Scope.
+   This license governs the copying, distribution, and modification of the
+   Program.  Other activities are outside the scope of this license; The
+   act of running the Program is not restricted, and the output from the
+   Program is covered only if its contents constitute a work based on the
+   Program.
+
+2. Verbatim copies.
+   You may copy and distribute verbatim copies of the Program as you
+   receive it, in any medium, provided that you conspicuously and
+   appropriately publish on each copy an appropriate copyright notice; keep
+   intact all the notices that refer to this License and to the absence of
+   any warranty; and give any other recipients of the Program a copy of this
+   License along with the Program.
+
+3. Modification and redistribution under closed license.
+   You may modify your copy or copies of the Program, and distribute
+   the resulting derivative works, provided that you meet the
+   following conditions:
+   a) The copyright notice and disclaimer on the Program must be reproduced
+      and included in the source code, documentation, and/or other materials
+      provided in a manner in which such notices are normally distributed.
+   b) The derivative work must be clearly identified as such, in order that
+      it may not be confused with the original work.
+   c) The license under which the derivative work is distributed must
+      expressly prohibit the distribution of further derivative works.
+
+4. Modification and redistribution under open license.
+   You may modify your copy or copies of the Program, and distribute
+   the resulting derivative works, provided that you meet the
+   following conditions:
+   a) The copyright notice and disclaimer on the Program must be reproduced
+      and included in the source code, documentation, and/or other materials
+      provided in a manner in which such notices are normally distributed.
+   b) You must clearly indicate the nature and date of any changes made
+      to the Program.  The full details need not necessarily be included in
+      the individual modified files, provided that each modified file is
+      clearly marked as such and instructions are included on where the
+      full details of the modifications may be found.
+   c) You must cause any work that you distribute or publish, that in whole
+      or in part contains or is derived from the Program or any part
+      thereof, to be licensed as a whole at no charge to all third
+      parties under the terms of this License.
+
+5. Implied acceptance.
+   You may not copy or distribute the Program or any derivative works except
+   as expressly provided under this license.  Consequently, any such action
+   will be taken as implied acceptance of the terms of this license.
+
+6. NO WARRANTY.
+   THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+   THE COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+   REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE FOR ANY DIRECT,
+   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+   ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING, BUT
+   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+   TORT, EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+   POSSIBILITY OF SUCH DAMAGES.
diff --git a/third_party/bsdiff/README.google b/third_party/bsdiff/README.google
new file mode 100644
index 0000000..54e9998
--- /dev/null
+++ b/third_party/bsdiff/README.google
@@ -0,0 +1,10 @@
+This is Chrome's locally patched copy of Colin Percival's bsdiff tool
+(see ../bspatch for the corresponding bspatch tool).
+
+Originally obtained from Mozilla's local copy/fork of bsdiff; see:
+
+http://lxr.mozilla.org/mozilla/source/other-licenses/bsdiff/bsdiff.c
+
+The LICENSE from that location has been preserved here.
+
+Local changes include CRC32 verification.
diff --git a/third_party/bsdiff/SConscript b/third_party/bsdiff/SConscript
new file mode 100644
index 0000000..faf1247
--- /dev/null
+++ b/third_party/bsdiff/SConscript
@@ -0,0 +1,59 @@
+# Copyright 2008, Google Inc.

+# All rights reserved.

+#

+# Redistribution and use in source and binary forms, with or without

+# modification, are permitted provided that the following conditions are

+# met:

+#

+#    * Redistributions of source code must retain the above copyright

+# notice, this list of conditions and the following disclaimer.

+#    * Redistributions in binary form must reproduce the above

+# copyright notice, this list of conditions and the following disclaimer

+# in the documentation and/or other materials provided with the

+# distribution.

+#    * Neither the name of Google Inc. nor the names of its

+# contributors may be used to endorse or promote products derived from

+# this software without specific prior written permission.

+#

+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+

+Import('env')

+

+env = env.Clone()

+

+env.Prepend(

+    CPPPATH = [

+        '../bspatch',

+    ]

+)

+

+env.Append(

+    CCFLAGS = [

+        '/TP',

+

+        '/wd4800',

+        '/wd4503',

+        '/wd4819',

+    ],

+

+    CPPDEFINES = [

+        'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',

+        'WIN32_LEAN_AND_MEAN',

+    ],

+)

+

+input_files = [

+    "mbsdiff.cc",

+]

+

+env.StaticLibrary('bsdiff', input_files)

diff --git a/third_party/bsdiff/bsdiff.vcproj b/third_party/bsdiff/bsdiff.vcproj
new file mode 100644
index 0000000..dd8d7b3
--- /dev/null
+++ b/third_party/bsdiff/bsdiff.vcproj
@@ -0,0 +1,148 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="8.00"
+	Name="bsdiff"
+	ProjectGUID="{E1D0B89E-257B-4BCA-A0C6-A2CD997A2FDC}"
+	RootNamespace="bsdiff"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(SolutionDir)..\build\common.vsprops;$(SolutionDir)..\build\debug.vsprops;$(SolutionDir)..\build\external_code.vsprops;$(SolutionDir)..\third_party\bspatch\using_bspatch.vsprops;.\bsdiff.vsprops"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(SolutionDir)..\build\common.vsprops;$(SolutionDir)..\build\release.vsprops;$(SolutionDir)..\build\external_code.vsprops;$(SolutionDir)..\third_party\bspatch\using_bspatch.vsprops;.\bsdiff.vsprops"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<File
+			RelativePath=".\mbsdiff.cc"
+			>
+		</File>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>
diff --git a/third_party/bsdiff/bsdiff.vsprops b/third_party/bsdiff/bsdiff.vsprops
new file mode 100644
index 0000000..3c25bba
--- /dev/null
+++ b/third_party/bsdiff/bsdiff.vsprops
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioPropertySheet
+	ProjectType="Visual C++"
+	Version="8.00"
+	Name="bsdiff"
+	>
+	<Tool
+		Name="VCLinkerTool"
+		AdditionalDependencies="Ws2_32.lib"
+	/>
+</VisualStudioPropertySheet>
diff --git a/third_party/bsdiff/mbsdiff.cc b/third_party/bsdiff/mbsdiff.cc
new file mode 100644
index 0000000..29227e8
--- /dev/null
+++ b/third_party/bsdiff/mbsdiff.cc
@@ -0,0 +1,382 @@
+/*
+  bsdiff.c -- Binary patch generator.
+
+  Copyright 2003 Colin Percival
+
+  For the terms under which this work may be distributed, please see
+  the adjoining file "LICENSE".
+
+  ChangeLog:
+  2005-05-05 - Use the modified header struct from bspatch.h; use 32-bit
+               values throughout.
+                 --Benjamin Smedberg <benjamin@smedbergs.us>
+  2005-05-18 - Use the same CRC algorithm as bzip2, and leverage the CRC table
+               provided by libbz2.
+                 --Darin Fisher <darin@meer.net>
+  2007-11-14 - Changed to use Crc from Lzma library instead of Bzip library
+                 --Rahul Kuchhal
+*/
+
+#include "mbspatch.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#ifdef _WIN32
+#include <io.h>
+#include <winsock2.h>
+#else
+#include <unistd.h>
+#include <arpa/inet.h>
+#define _O_BINARY 0
+#endif
+
+#undef MIN
+#define MIN(x,y) (((x)<(y)) ? (x) : (y))
+
+static void
+reporterr(int e, const char *fmt, ...)
+{
+	if (fmt) {
+		va_list args;
+		va_start(args, fmt);
+		vfprintf(stderr, fmt, args);
+		va_end(args);
+	}
+
+	exit(e);
+}
+
+static void
+split(int *I,int *V,int start,int len,int h)
+{
+	int i,j,k,x,tmp,jj,kk;
+
+	if(len<16) {
+		for(k=start;k<start+len;k+=j) {
+			j=1;x=V[I[k]+h];
+			for(i=1;k+i<start+len;i++) {
+				if(V[I[k+i]+h]<x) {
+					x=V[I[k+i]+h];
+					j=0;
+				};
+				if(V[I[k+i]+h]==x) {
+					tmp=I[k+j];I[k+j]=I[k+i];I[k+i]=tmp;
+					j++;
+				};
+			};
+			for(i=0;i<j;i++) V[I[k+i]]=k+j-1;
+			if(j==1) I[k]=-1;
+		};
+		return;
+	};
+
+	x=V[I[start+len/2]+h];
+	jj=0;kk=0;
+	for(i=start;i<start+len;i++) {
+		if(V[I[i]+h]<x) jj++;
+		if(V[I[i]+h]==x) kk++;
+	};
+	jj+=start;kk+=jj;
+
+	i=start;j=0;k=0;
+	while(i<jj) {
+		if(V[I[i]+h]<x) {
+			i++;
+		} else if(V[I[i]+h]==x) {
+			tmp=I[i];I[i]=I[jj+j];I[jj+j]=tmp;
+			j++;
+		} else {
+			tmp=I[i];I[i]=I[kk+k];I[kk+k]=tmp;
+			k++;
+		};
+	};
+
+	while(jj+j<kk) {
+		if(V[I[jj+j]+h]==x) {
+			j++;
+		} else {
+			tmp=I[jj+j];I[jj+j]=I[kk+k];I[kk+k]=tmp;
+			k++;
+		};
+	};
+
+	if(jj>start) split(I,V,start,jj-start,h);
+
+	for(i=0;i<kk-jj;i++) V[I[jj+i]]=kk-1;
+	if(jj==kk-1) I[jj]=-1;
+
+	if(start+len>kk) split(I,V,kk,start+len-kk,h);
+}
+
+static void
+qsufsort(int *I,int *V,unsigned char *old,int oldsize)
+{
+	int buckets[256];
+	int i,h,len;
+
+	for(i=0;i<256;i++) buckets[i]=0;
+	for(i=0;i<oldsize;i++) buckets[old[i]]++;
+	for(i=1;i<256;i++) buckets[i]+=buckets[i-1];
+	for(i=255;i>0;i--) buckets[i]=buckets[i-1];
+	buckets[0]=0;
+
+	for(i=0;i<oldsize;i++) I[++buckets[old[i]]]=i;
+	I[0]=oldsize;
+	for(i=0;i<oldsize;i++) V[i]=buckets[old[i]];
+	V[oldsize]=0;
+	for(i=1;i<256;i++) if(buckets[i]==buckets[i-1]+1) I[buckets[i]]=-1;
+	I[0]=-1;
+
+	for(h=1;I[0]!=-(oldsize+1);h+=h) {
+		len=0;
+		for(i=0;i<oldsize+1;) {
+			if(I[i]<0) {
+				len-=I[i];
+				i-=I[i];
+			} else {
+				if(len) I[i-len]=-len;
+				len=V[I[i]]+1-i;
+				split(I,V,i,len,h);
+				i+=len;
+				len=0;
+			};
+		};
+		if(len) I[i-len]=-len;
+	};
+
+	for(i=0;i<oldsize+1;i++) I[V[i]]=i;
+}
+
+static int
+matchlen(unsigned char *old,int oldsize,unsigned char *newbuf,int newsize)
+{
+	int i;
+
+	for(i=0;(i<oldsize)&&(i<newsize);i++)
+		if(old[i]!=newbuf[i]) break;
+
+	return i;
+}
+
+static int
+search(int *I,unsigned char *old,int oldsize,
+       unsigned char *newbuf,int newsize,int st,int en,int *pos)
+{
+	int x,y;
+
+	if(en-st<2) {
+		x=matchlen(old+I[st],oldsize-I[st],newbuf,newsize);
+		y=matchlen(old+I[en],oldsize-I[en],newbuf,newsize);
+
+		if(x>y) {
+			*pos=I[st];
+			return x;
+		} else {
+			*pos=I[en];
+			return y;
+		}
+	};
+
+	x=st+(en-st)/2;
+	if(memcmp(old+I[x],newbuf,MIN(oldsize-I[x],newsize))<0) {
+		return search(I,old,oldsize,newbuf,newsize,x,en,pos);
+	} else {
+		return search(I,old,oldsize,newbuf,newsize,st,x,pos);
+	};
+}
+
+int main(int argc,char *argv[])
+{
+	int fd;
+	unsigned char *old,*newbuf;
+	int oldsize,newsize;
+	int *I,*V;
+
+	int scan,pos,len;
+	int lastscan,lastpos,lastoffset;
+	int oldscore,scsc;
+
+	int s,Sf,lenf,Sb,lenb;
+	int overlap,Ss,lens;
+	int i;
+
+	int dblen,eblen;
+	unsigned char *db,*eb;
+
+	unsigned int scrc;
+
+	MBSPatchHeader header = {
+		{'M','B','D','I','F','F','1','0'},
+		0, 0, 0, 0, 0, 0
+	};
+
+	int numtriples;
+
+	if(argc!=4)
+		reporterr(1,"usage: %s <oldfile> <newfile> <patchfile>\n",argv[0]);
+
+	/* Allocate oldsize+1 bytes instead of oldsize bytes to ensure
+		that we never try to malloc(0) and get a NULL pointer */
+	if(((fd=open(argv[1],O_RDONLY|_O_BINARY,0))<0) ||
+		((oldsize=lseek(fd,0,SEEK_END))==-1) ||
+		((old=(unsigned char*) malloc(oldsize+1))==NULL) ||
+		(lseek(fd,0,SEEK_SET)!=0) ||
+		(read(fd,old,oldsize)!=oldsize) ||
+		(close(fd)==-1))
+		reporterr(1,"%s\n",argv[1]);
+
+	scrc = CalculateCrc(old, oldsize);
+
+	if(((I=(int*) malloc((oldsize+1)*sizeof(int)))==NULL) ||
+		((V=(int*) malloc((oldsize+1)*sizeof(int)))==NULL))
+		reporterr(1,NULL);
+
+	qsufsort(I,V,old,oldsize);
+
+	free(V);
+
+	/* Allocate newsize+1 bytes instead of newsize bytes to ensure
+		that we never try to malloc(0) and get a NULL pointer */
+	if(((fd=open(argv[2],O_RDONLY|_O_BINARY,0))<0) ||
+		((newsize=lseek(fd,0,SEEK_END))==-1) ||
+		((newbuf=(unsigned char*) malloc(newsize+1))==NULL) ||
+		(lseek(fd,0,SEEK_SET)!=0) ||
+		(read(fd,newbuf,newsize)!=newsize) ||
+		(close(fd)==-1)) reporterr(1,"%s\n",argv[2]);
+
+	if(((db=(unsigned char*) malloc(newsize+1))==NULL) ||
+		((eb=(unsigned char*) malloc(newsize+1))==NULL))
+		reporterr(1,NULL);
+
+	dblen=0;
+	eblen=0;
+
+	if((fd=open(argv[3],O_CREAT|O_TRUNC|O_WRONLY|_O_BINARY,0666))<0)
+		reporterr(1,"%s\n",argv[3]);
+
+	/* start writing here */
+
+	/* We don't know the lengths yet, so we will write the header again
+		 at the end */
+
+	if(write(fd,&header,sizeof(MBSPatchHeader))!=sizeof(MBSPatchHeader))
+		reporterr(1,"%s\n",argv[3]);
+
+	scan=0;len=0;
+	lastscan=0;lastpos=0;lastoffset=0;
+	numtriples = 0;
+	while(scan<newsize) {
+		oldscore=0;
+
+		for(scsc=scan+=len;scan<newsize;scan++) {
+			len=search(I,old,oldsize,newbuf+scan,newsize-scan,
+					0,oldsize,&pos);
+
+			for(;scsc<scan+len;scsc++)
+			if((scsc+lastoffset<oldsize) &&
+				(old[scsc+lastoffset] == newbuf[scsc]))
+				oldscore++;
+
+			if(((len==oldscore) && (len!=0)) || 
+				(len>oldscore+8)) break;
+
+			if((scan+lastoffset<oldsize) &&
+				(old[scan+lastoffset] == newbuf[scan]))
+				oldscore--;
+		};
+
+		if((len!=oldscore) || (scan==newsize)) {
+			MBSPatchTriple triple;
+
+			s=0;Sf=0;lenf=0;
+			for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
+				if(old[lastpos+i]==newbuf[lastscan+i]) s++;
+				i++;
+				if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
+			};
+
+			lenb=0;
+			if(scan<newsize) {
+				s=0;Sb=0;
+				for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
+					if(old[pos-i]==newbuf[scan-i]) s++;
+					if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
+				};
+			};
+
+			if(lastscan+lenf>scan-lenb) {
+				overlap=(lastscan+lenf)-(scan-lenb);
+				s=0;Ss=0;lens=0;
+				for(i=0;i<overlap;i++) {
+					if(newbuf[lastscan+lenf-overlap+i]==
+					   old[lastpos+lenf-overlap+i]) s++;
+					if(newbuf[scan-lenb+i]==
+					   old[pos-lenb+i]) s--;
+					if(s>Ss) { Ss=s; lens=i+1; };
+				};
+
+				lenf+=lens-overlap;
+				lenb-=lens;
+			};
+
+			for(i=0;i<lenf;i++)
+				db[dblen+i]=newbuf[lastscan+i]-old[lastpos+i];
+			for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
+				eb[eblen+i]=newbuf[lastscan+lenf+i];
+
+			dblen+=lenf;
+			eblen+=(scan-lenb)-(lastscan+lenf);
+
+			triple.x = htonl(lenf);
+			triple.y = htonl((scan-lenb)-(lastscan+lenf));
+			triple.z = htonl((pos-lenb)-(lastpos+lenf));
+			if (write(fd,&triple,sizeof(triple)) != sizeof(triple))
+				reporterr(1,NULL);
+
+#ifdef DEBUG_bsmedberg
+			printf("Writing a block:\n"
+			       "	X: %u\n"
+			       "	Y: %u\n"
+			       "	Z: %i\n",
+			       (int) lenf,
+			       (int) ((scan-lenb)-(lastscan+lenf)),
+			       (int) ((pos-lenb)-(lastpos+lenf)));
+#endif
+
+			++numtriples;
+
+			lastscan=scan-lenb;
+			lastpos=pos-lenb;
+			lastoffset=pos-scan;
+		};
+	};
+
+	if(write(fd,db,dblen)!=dblen)
+		reporterr(1,NULL);
+
+	if(write(fd,eb,eblen)!=eblen)
+		reporterr(1,NULL);
+
+	header.slen	= htonl(oldsize);
+	header.scrc32	= htonl(scrc);
+	header.dlen	= htonl(newsize);
+	header.cblen	= htonl(numtriples * sizeof(MBSPatchTriple));
+	header.difflen	= htonl(dblen);
+	header.extralen = htonl(eblen);
+
+	if (lseek(fd,0,SEEK_SET) == -1 ||
+	    write(fd,&header,sizeof(header)) != sizeof(header) ||
+	    close(fd) == -1)
+		reporterr(1,NULL);
+
+	free(db);
+	free(eb);
+	free(I);
+	free(old);
+	free(newbuf);
+
+	return 0;
+}
\ No newline at end of file