Rename

ios/RCTPushy/BSDiff/bzip/bspatch.c

@@ -0,0 +1,194 @@
+/*-
+ * Copyright 2003-2005 Colin Percival
+ * Copyright 2012 Matthew Endsley
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions 
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include "bspatch.h"
+#include <bzlib.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <err.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static int64_t offtin(uint8_t *buf)
+{
+	int64_t y;
+
+	y=buf[7]&0x7F;
+	y=y*256;y+=buf[6];
+	y=y*256;y+=buf[5];
+	y=y*256;y+=buf[4];
+	y=y*256;y+=buf[3];
+	y=y*256;y+=buf[2];
+	y=y*256;y+=buf[1];
+	y=y*256;y+=buf[0];
+
+	if(buf[7]&0x80) y=-y;
+
+	return y;
+}
+
+int bspatch(const uint8_t* old, int64_t oldsize, uint8_t* new, int64_t newsize, struct bspatch_stream* stream)
+{
+	uint8_t buf[8];
+	int64_t oldpos,newpos;
+	int64_t ctrl[3];
+	int64_t i;
+
+	oldpos=0;newpos=0;
+	while(newpos<newsize) {
+		/* Read control data */
+		for(i=0;i<=2;i++) {
+			if (stream->read(stream, buf, 8))
+				return -1;
+			ctrl[i]=offtin(buf);
+		};
+
+		/* Sanity-check */
+		if(newpos+ctrl[0]>newsize)
+			return -1;
+
+		/* Read diff string */
+		if (stream->read(stream, new + newpos, ctrl[0]))
+			return -1;
+
+		/* Add old data to diff string */
+		for(i=0;i<ctrl[0];i++)
+			if((oldpos+i>=0) && (oldpos+i<oldsize))
+				new[newpos+i]+=old[oldpos+i];
+
+		/* Adjust pointers */
+		newpos+=ctrl[0];
+		oldpos+=ctrl[0];
+
+		/* Sanity-check */
+		if(newpos+ctrl[1]>newsize)
+			return -1;
+
+		/* Read extra string */
+		if (stream->read(stream, new + newpos, ctrl[1]))
+			return -1;
+
+		/* Adjust pointers */
+		newpos+=ctrl[1];
+		oldpos+=ctrl[2];
+	};
+
+	return 0;
+}
+
+static int bz2_read(const struct bspatch_stream* stream, void* buffer, int length)
+{
+    int n;
+    int bz2err;
+    BZFILE* bz2;
+    
+    bz2 = (BZFILE*)stream->opaque;
+    n = BZ2_bzRead(&bz2err, bz2, buffer, length);
+    if (n != length)
+        return -1;
+    
+    return 0;
+}
+
+int beginPatch(const char* oldfile, const char* newfile, const char* patchfile)
+{
+    FILE * f;
+    int fd;
+    int bz2err;
+    uint8_t header[32];
+    uint8_t *old, *new;
+    int64_t oldsize, newsize;
+    BZFILE* bz2;
+    struct bspatch_stream stream;
+    
+    //    if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
+    
+    /* Open patch file */
+    if ((f = fopen(patchfile, "r")) == NULL) {
+        //        err(1, "fopen(%s)", patchfile);
+        return -1;
+    }
+    
+    /* Read header */
+    if (fread(header, 1, 32, f) != 32) {
+        if (feof(f)) {
+            //            errx(1, "Corrupt patch\n");
+        }
+        //        err(1, "fread(%s)", patchfile);
+        return -1;
+    }
+    
+    /* Check for appropriate magic */
+    if (memcmp(header, "ENDSLEY/BSDIFF43", 16) != 0) {
+        //        errx(1, "Corrupt patch\n");
+        return -1;
+    }
+    
+    /* Read lengths from header */
+    newsize=offtin(header+16);
+    if(newsize<0) {
+        //        errx(1,"Corrupt patch\n");
+        return -1;
+    }
+    
+    /* Close patch file and re-open it via libbzip2 at the right places */
+    if(((fd=open(oldfile,O_RDONLY,0))<0) ||
+       ((oldsize=lseek(fd,0,SEEK_END))==-1) ||
+       ((old=malloc(oldsize+1))==NULL) ||
+       (lseek(fd,0,SEEK_SET)!=0) ||
+       (read(fd,old,oldsize)!=oldsize) ||
+       (close(fd)==-1)) err(1,"%s",oldfile);
+    if((new=malloc(newsize+1))==NULL) err(1,NULL);
+    
+    if (NULL == (bz2 = BZ2_bzReadOpen(&bz2err, f, 0, 1, NULL, 0))) {
+        //        errx(1, "BZ2_bzReadOpen, bz2err=%d", bz2err);
+        return -1;
+    }
+    
+    stream.read = bz2_read;
+    stream.opaque = bz2;
+    if (bspatch(old, oldsize, new, newsize, &stream)) {
+        //        errx(1, "bspatch");
+        return -1;
+    }
+    
+    /* Clean up the bzip2 reads */
+    BZ2_bzReadClose(&bz2err, bz2);
+    fclose(f);
+    
+    /* Write the new file */
+    if(((fd=open(newfile,O_CREAT|O_TRUNC|O_WRONLY,0666))<0) ||
+       (write(fd,new,newsize)!=newsize) || (close(fd)==-1)) {
+        err(1,"%s",newfile);
+        return -1;
+    }
+    free(new);
+    free(old);
+    return 0;
+}