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#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;
}
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