Add a strextract.c tool, which is basically a sample program to use the

streaming extract API.

Author: synacknet

tools/Makefile

@@ -1,7 +1,8 @@
 CFLAGS = -g `xml2-config --cflags`
-LDFLAGS = -lxar `xml2-config --libs` -lcrypto -lbz2 -lacl
+LDFLAGS = -lxar `xml2-config --libs` -lcrypto 
 all: xardiff vitoc toc_extract
 xardiff: xardiff.o
+strextract: strextract.o
 vitoc: vitoc.o
 toc_extract: toc_extract.o
 

tools/strextract.c

@@ -0,0 +1,87 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <xar/xar.h>
+#include <sys/fcntl.h>
+
+static int32_t err_callback(int32_t sev, int32_t err, xar_errctx_t ctx, void *usrctx) {
+	fprintf(stderr, "err callback\n");
+}
+
+int main(int argc, char *argv[]) {
+	xar_t x;
+	xar_iter_t i;
+	xar_file_t f;
+	xar_stream s;
+	char buffer[8192];
+
+	x = xar_open(argv[1], READ);
+	if( !x ) {
+		fprintf(stderr, "Error opening archive\n");
+		exit(1);
+	}
+
+	xar_register_errhandler(x, err_callback, NULL);
+
+	i = xar_iter_new();
+	if( !i ) {
+		fprintf(stderr, "Error creating xar iterator\n");
+		exit(1);
+	}
+
+	for(f = xar_file_first(x, i); f; f = xar_file_next(i)) {
+		char *path;
+		const char *type;
+		int32_t ret;
+		int fd;
+
+		path = xar_get_path(f);
+
+		xar_prop_get(f, "type", &type);
+		if( !type ) {
+			fprintf(stderr, "File has no type %s\n", path);
+			free(path);
+			continue;
+		}
+		if( strcmp(type, "file") != 0 ) {
+			fprintf(stderr, "Skipping %s\n", path);
+			free(path);
+			continue;
+		}
+	
+		fprintf(stderr, "Extracting %s\n", path);
+		if( xar_extract_tostream_init(x, f, &s) != XAR_STREAM_OK ) {
+			fprintf(stderr, "Error initializing stream %s\n", path);
+			free(path);
+			continue;
+		}
+		
+		fd = open(path, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
+		if( !fd ) {
+			fprintf(stderr, "Error opening output file %s\n", path);
+			free(path);
+			continue;
+		}
+		s.avail_out = sizeof(buffer);
+		s.next_out = buffer;
+
+		while( (ret = xar_extract_tostream(&s)) != XAR_STREAM_END ) {
+			if( ret == XAR_STREAM_ERR ) {
+				fprintf(stderr, "Error extracting stream %s\n", path);
+				exit(2);
+			}
+
+			write(fd, buffer, sizeof(buffer)-s.avail_out);
+
+			s.avail_out = sizeof(buffer);
+			s.next_out = buffer;
+		}
+
+		if( xar_extract_tostream_end(&s) != XAR_STREAM_OK ) {
+			fprintf(stderr, "Error ending stream %s\n", path);
+		}
+
+		close(fd);
+		free(path);
+	}
+}