libstore: replaced gz decompression code with libz

Note: dropped .zip support

configure.ac: added check for libz
ext2fs/Makefile: linked libz
fatfs/Makefile: linked libz
isofs/Makefile: linked libz
libstore/Makefile: linked libz
libstore/do-gunzip.c: new decompression function using libz calls.
libstore/gunzip.c: removed no longer needed code replaced by do_gunzip()
libstore/gzip.h: deleted, no longer needed
libstore/inflate.c: deleted: no longer needed
libstore/tailor.h: deleted: no longer needed
libstore/unzip.c: deleted: no longer needed
libstore/util.c: removed no longer needed code.

1 files changed, 59 insertions, 0 deletions

diff --git a/libstore/do-gunzip.c b/libstore/do-gunzip.c
new file mode 100644
index 00000000..6a1c2a95
--- /dev/null
+++ b/libstore/do-gunzip.c
@@ -0,0 +1,59 @@
+#include <zlib.h>
+
+/* I/O interface */
+extern int (*unzip_read) (char *buf, size_t maxread);
+extern void (*unzip_write) (const char *buf, size_t nwrite);
+extern void (*unzip_read_error) (void);
+extern void (*unzip_error) (const char *msg);
+
+#define INBUFSIZ	0x1000
+#define OUTBUFSIZ	0x1000
+
+static unsigned char inbuf[INBUFSIZ];
+static unsigned char outbuf[OUTBUFSIZ];
+
+void
+do_gunzip (void)
+{
+  int result;
+  z_stream strm;
+
+  strm.zalloc = NULL;
+  strm.zfree = NULL;
+  strm.opaque = NULL;
+
+  strm.avail_in  = 0;
+  strm.next_out = outbuf;
+  strm.avail_out = OUTBUFSIZ;
+
+  result = inflateInit2 (&strm, 32 + MAX_WBITS);
+
+  while (result == Z_OK)
+  {
+    if (strm.avail_in == 0)
+    {
+      strm.next_in = inbuf;
+      strm.avail_in  = (*unzip_read)((char*) strm.next_in, INBUFSIZ);
+
+      if (strm.avail_in == 0)
+        break;
+    }
+
+    result = inflate (&strm, Z_NO_FLUSH);
+
+    if ((result != Z_OK) && (result != Z_STREAM_END))
+      break;
+
+    if ((strm.avail_out == 0) || (result == Z_STREAM_END))
+    {
+      (*unzip_write) ((char*) outbuf, OUTBUFSIZ - strm.avail_out);
+      strm.next_out = outbuf;
+      strm.avail_out = OUTBUFSIZ;
+    }
+  }
+
+  inflateEnd (&strm);
+
+  if (result != Z_STREAM_END)
+    (*unzip_error) (NULL);
+}