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#include "internal.h"
flate·Writer*
flate·openwriter(io·Writer wtr, void* w, mem·Allocator mem, void* m)
{
int err;
flate·Writer *zwtr;
zwtr = mem.alloc(m, 1, sizeof(*zwtr));
zwtr->zalloc = (void *(*)(void *, unsigned int, unsigned int))mem.alloc;
zwtr->zfree = mem.free;
zwtr->opaque = m;
zwtr->avail_in = 0;
err = deflateInit(&zwtr->b.z, Z_DEFAULT_COMPRESSION);
switch (err) {
case Z_OK:
return zwtr;
case Z_MEM_ERROR:
errorf("zlib: not enough memory");
goto ERROR;
case Z_VERSION_ERROR:
errorf("zlib: incompatible version");
goto ERROR;
case Z_STREAM_ERROR:
errorf("zlib: incorrect compression level");
goto ERROR;
default:
errorf("zlib: unrecognized error code");
}
ERROR:
errorf("zlib: msg: %s", zwtr->msg);
mem.free(m, zwtr);
return nil;
}
int
flate·closewriter(flate·Writer *wtr)
{
int err;
flate·Writer zwtr;
zwtr = *wtr;
err = deflateEnd(&zwtr.b.z);
if (err != Z_OK) {
errorf("zlib: failed to cleanup");
return err;
}
zwtr.zfree(zwtr.opaque, wtr);
return 0;
}
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