1 files changed, 95 insertions, 0 deletions
diff --git a/controller/unzbuffer.c b/controller/unzbuffer.c
new file mode 100644
index 0000000..ecd38a6
--- /dev/null
+++ b/controller/unzbuffer.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <assert.h>
+#include <zlib.h>
+#include "unzbuffer.h"
+
+#define BUFSZ_ZOUT (256*1024)
+
+
+struct unzbuffer {
+	u8 *out;
+	i64 outfill;
+	z_stream strm;
+
+	bool just_resetted;
+
+	unzbuffer_writefunc *wf;
+	void *payload;
+};
+
+struct unzbuffer* unzbuffer_init(unzbuffer_writefunc *wf,void *payload){
+	struct unzbuffer *z=malloc(1,struct unzbuffer);
+	z->out=malloc(BUFSZ_ZOUT,u8);
+	z->outfill=0;
+
+	z->strm.zalloc=Z_NULL;
+	z->strm.zfree=Z_NULL;
+	z->strm.opaque=Z_NULL;
+	z->strm.avail_in=0;
+	z->strm.next_in=Z_NULL;
+
+	// so unzbuffer_write can start writing immediately
+	z->strm.avail_out=BUFSZ_ZOUT;
+	z->strm.next_out=z->out;
+
+	if(inflateInit(&z->strm)!=Z_OK){
+		return NULL;
+	}
+
+	z->just_resetted=true;
+
+	z->wf=wf;
+	z->payload=payload;
+	return z;
+}
+
+bool unzbuffer_write(struct unzbuffer *z,u8 *data,i64 len){
+	z->just_resetted=false;
+	z->strm.avail_in=len;
+	z->strm.next_in=data;
+	assert(z->strm.avail_out>0);
+	while(true){
+		int ret=inflate(&z->strm,Z_NO_FLUSH);
+		if(ret!=Z_OK&&ret!=Z_STREAM_END){
+			inflateEnd(&z->strm);
+			fprintf(stderr,"unz error: %d\n",ret);
+			return false;
+		}
+		if(ret!=Z_STREAM_END&&z->strm.avail_out>0)break;
+		z->wf(z->out,BUFSZ_ZOUT,z->payload);
+		if(ret==Z_STREAM_END){
+			inflateReset(&z->strm);
+			z->strm.avail_in=0;
+			z->strm.next_in=Z_NULL;
+			z->strm.avail_out=BUFSZ_ZOUT;
+			z->strm.next_out=z->out;
+			z->just_resetted=true;
+			break;
+		}
+		z->strm.avail_out=BUFSZ_ZOUT;
+		z->strm.next_out=z->out;
+	}
+	assert(z->strm.avail_in==0);
+	return true;
+}
+
+bool unzbuffer_finish_destroy(struct unzbuffer *z){
+	if(!z->just_resetted){
+		assert(z->strm.avail_out>0);
+		while(true){
+			int ret=inflate(&z->strm,Z_FINISH);
+			if(ret!=Z_OK&&ret!=Z_STREAM_END){
+				inflateEnd(&z->strm);
+				fprintf(stderr,"unz error: %d\n",ret);
+				return false;
+			}
+			z->wf(z->out,BUFSZ_ZOUT-z->strm.avail_out,z->payload);
+			if(z->strm.avail_out>0)break;
+			z->strm.avail_out=BUFSZ_ZOUT;
+			z->strm.next_out=z->out;
+		}
+	}
+	free(z->out);
+	free(z);
+	return true;
+}