From 7549d07933091417b225d094c1648e1382287f93 Mon Sep 17 00:00:00 2001 From: tomsmeding Date: Wed, 11 Oct 2017 08:32:09 +0200 Subject: Initial --- server/zbuffer.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 server/zbuffer.c (limited to 'server/zbuffer.c') diff --git a/server/zbuffer.c b/server/zbuffer.c new file mode 100644 index 0000000..af37f74 --- /dev/null +++ b/server/zbuffer.c @@ -0,0 +1,79 @@ +#include +#include +#include "zbuffer.h" + +#define BUFSZ_ZOUT (256*1024) + + +struct zbuffer { + u8 *out; + i64 outfill; + z_stream strm; + + zbuffer_writefunc *wf; + void *payload; +}; + +struct zbuffer* zbuffer_init(zbuffer_writefunc *wf,void *payload){ + struct zbuffer *z=malloc(1,struct zbuffer); + z->out=malloc(BUFSZ_ZOUT,u8); + z->outfill=0; + + z->strm.zalloc=Z_NULL; + z->strm.zfree=Z_NULL; + z->strm.opaque=Z_NULL; + + // so zbuffer_write can start writing immediately + z->strm.avail_out=BUFSZ_ZOUT; + z->strm.next_out=z->out; + + if(deflateInit(&z->strm,Z_DEFAULT_COMPRESSION)!=Z_OK){ + return NULL; + } + + z->wf=wf; + z->payload=payload; + return z; +} + +void zbuffer_write(struct zbuffer *z,u8 *data,i64 len){ + z->strm.avail_in=len; + z->strm.next_in=data; + assert(z->strm.avail_out>0); + while(true){ + int ret=deflate(&z->strm,Z_NO_FLUSH); + assert(ret==Z_OK); + if(z->strm.avail_out>0)break; + z->wf(z->out,BUFSZ_ZOUT,z->payload); + z->strm.avail_out=BUFSZ_ZOUT; + z->strm.next_out=z->out; + } + assert(z->strm.avail_in==0); +} + +void zbuffer_flush(struct zbuffer *z){ + assert(z->strm.avail_out>0); + while(true){ + int ret=deflate(&z->strm,Z_SYNC_FLUSH); + assert(ret==Z_OK); + z->wf(z->out,BUFSZ_ZOUT-z->strm.avail_out,z->payload); + bool done=z->strm.avail_out>0; + z->strm.avail_out=BUFSZ_ZOUT; + z->strm.next_out=z->out; + if(done)break; + } +} + +void zbuffer_finish_destroy(struct zbuffer *z){ + assert(z->strm.avail_out>0); + while(true){ + int ret=deflate(&z->strm,Z_FINISH); + assert(ret==Z_OK||ret==Z_STREAM_END); + 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); +} -- cgit v1.2.3-54-g00ecf