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#include "tra.h"
#include "zlib.h"
#include "zutil.h"
struct Flate
{
z_stream zs;
};
Flate*
deflateinit(int level)
{
int err;
Flate *f;
f = emalloc(sizeof(Flate));
if((err = deflateInit(&f->zs, level)) != Z_OK){
werrstr("%s", z_errmsg[err]);
free(f);
return nil;
}
return f;
}
void
deflateclose(Flate *f)
{
deflateEnd(&f->zs);
free(f);
}
int
deflateblock(Flate *f, uchar *dst, int ndst, uchar *src, int nsrc)
{
int err;
f->zs.next_in = src;
f->zs.avail_in = nsrc;
f->zs.next_out = dst;
f->zs.avail_out = ndst;
err = deflate(&f->zs, Z_SYNC_FLUSH);
if(err != Z_OK){
werrstr("%s", z_errmsg[err]);
return -1;
}
return ndst - f->zs.avail_out;
}
Flate*
inflateinit(void)
{
int err;
Flate *f;
f = emalloc(sizeof(Flate));
if((err = inflateInit(&f->zs)) != Z_OK){
werrstr("%s", z_errmsg[err]);
free(f);
return nil;
}
return f;
}
void
inflateclose(Flate *f)
{
inflateEnd(&f->zs);
free(f);
}
int
inflateblock(Flate *f, uchar *dst, int ndst, uchar *src, int nsrc)
{
int err;
f->zs.next_in = src;
f->zs.avail_in = nsrc;
f->zs.next_out = dst;
f->zs.avail_out = ndst;
err = inflate(&f->zs, Z_SYNC_FLUSH);
if(err != Z_OK){
werrstr("%s", z_errmsg[err]);
return -1;
}
return ndst - f->zs.avail_out;
}
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