unzip applet by Laurence Anderson

----------------------------------------------------------------------

include/applets.h

@@ -470,6 +470,9 @@
 #ifdef CONFIG_UNIX2DOS
 	APPLET(unix2dos, dos2unix_main, _BB_DIR_USR_BIN)
 #endif
+#ifdef CONFIG_UNZIP
+	APPLET(unzip, unzip_main, _BB_DIR_USR_BIN)
+#endif
 #ifdef CONFIG_UPDATE
 	APPLET(update, update_main, _BB_DIR_SBIN)
 #endif

include/libbb.h

@@ -215,6 +215,7 @@ extern long arith (const char *startbuf, int *errcode);
 int read_package_field(const char *package_buffer, char **field_name, char **field_value);
 char *fgets_str(FILE *file, const char *terminating_string);
 
+extern int inflate(FILE *in, FILE *out);
 extern int unzip(FILE *l_in_file, FILE *l_out_file);
 extern void gz_close(int gunzip_pid);
 extern FILE *gz_open(FILE *compressed_file, int *pid);

include/unarchive.h

@@ -26,11 +26,13 @@ typedef struct file_headers_s {
 	mode_t mode;
 	time_t mtime;
 	dev_t device;
+	int (*extract_func)(FILE *, FILE *);
 } file_header_t;
 
 file_header_t *get_header_ar(FILE *in_file);
 file_header_t *get_header_cpio(FILE *src_stream);
 file_header_t *get_header_tar(FILE *tar_stream);
+file_header_t *get_header_zip(FILE *zip_stream);
 
 void seek_sub_file(FILE *src_stream, const int count);
 

include/usage.h

@@ -1851,6 +1851,19 @@
 	"\t-u\toutput will be in UNIX format\n" \
 	"\t-d\toutput will be in DOS format"
 
+#define unzip_trivial_usage \
+	"[-opts[modifiers]] file[.zip] [list] [-x xlist] [-d exdir]"
+#define unzip_full_usage \
+	"Extracts files from ZIP archives\n" \
+	"Options:\n" \
+	"\t-l\tlist archive contents (short form)\n" \
+	"\t-n\tnever overwrite existing files (default)\n" \
+	"\t-o\toverwrite files without prompting\n" \
+	"\t-p\tsend output to stdout\n" \
+	"\t-q\tbe quiet\n" \
+	"\t-x\texclude these files\n" \
+	"\t-d\textract files into this directory"
+
 #define update_trivial_usage \
 	"[options]"
 #define update_full_usage \