Diff: gunzip.cpp

Revision:

3:ed54c8225fe6

Parent:

1:2a3edb8df037

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gunzip.cpp	Tue Feb 28 16:50:16 2017 +0000
@@ -0,0 +1,38 @@
+#include "mbed.h"
+#include "zlib.h"
+
+/** GUNZIP a from src buffer to dst buffer
+ @param dst : destination buffer
+ @param dst_length : pointer to destination buffer length
+ @param src : source buffer
+ @param src_length : source buffer length
+ @return Z_OK on success, zlib error (<0) on failure
+ */
+extern "C" int gunzip(unsigned char *dst, unsigned long *dst_length, unsigned char *src, unsigned long src_length)
+{
+    z_stream stream;
+    memset(&stream, 0, sizeof(stream));
+
+    stream.next_in = src;
+    stream.avail_in = src_length;
+
+    stream.next_out = dst;
+    stream.avail_out = *dst_length;
+
+    int rv = inflateInit2(&stream, 15 + 16);
+    if (Z_OK == rv) {
+        rv = inflate(&stream, Z_NO_FLUSH);
+        if (Z_STREAM_END == rv) {
+            inflateEnd(&stream);
+            rv = Z_OK;
+        }
+    }
+
+    if (Z_OK == rv) {
+        *dst_length = stream.total_out;
+    } else {
+        *dst_length = 0;
+    }
+
+    return rv;
+}
\ No newline at end of file