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#include <fitz.h>
#include <zlib.h>
typedef struct fz_flate_s fz_flate;
struct fz_flate_s
{
fz_filter super;
z_stream z;
};
static void *
zmalloc(void *opaque, unsigned int items, unsigned int size)
{
fz_memorycontext *mctx = (fz_memorycontext*)opaque;
return mctx->malloc(mctx, items * size);
}
fz_error *
fz_newflated(fz_filter **fp, fz_obj *params)
{
fz_error *eo;
int ei;
FZ_NEWFILTER(fz_flate, f, flated);
f->z.zalloc = zmalloc;
f->z.zfree = (void(*)(void*,void*))fz_currentmemorycontext()->free;
f->z.opaque = fz_currentmemorycontext();
f->z.next_in = nil;
f->z.avail_in = 0;
ei = inflateInit(&f->z);
if (ei != Z_OK) {
eo = fz_throw("ioerror: inflateInit: %s", f->z.msg);
fz_free(f);
return eo;
}
return nil;
}
void
fz_freeflated(fz_filter *f)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
err = inflateEnd(zp);
if (err != Z_OK)
fprintf(stderr, "inflateEnd: %s", zp->msg);
fz_free(f);
}
fz_error *
fz_processflated(fz_filter *f, fz_buffer *in, fz_buffer *out)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
zp->next_in = in->rp;
zp->avail_in = in->wp - in->rp;
zp->next_out = out->wp;
zp->avail_out = out->ep - out->wp;
err = inflate(zp, Z_NO_FLUSH);
in->rp = in->wp - zp->avail_in;
out->wp = out->ep - zp->avail_out;
if (err == Z_STREAM_END) {
out->eof = 1;
return fz_iodone;
}
else if (err == Z_OK) {
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
return fz_ioneedin; /* hmm, what's going on here? */
}
else {
return fz_throw("ioerror: inflate: %s", zp->msg);
}
}
fz_error *
fz_newflatee(fz_filter **fp, fz_obj *params)
{
fz_obj *obj;
fz_error *eo;
int effort;
int ei;
FZ_NEWFILTER(fz_flate, f, flatee);
effort = -1;
if (params) {
obj = fz_dictgets(params, "Effort");
if (obj) effort = fz_toint(obj);
}
f->z.zalloc = zmalloc;
f->z.zfree = (void(*)(void*,void*))fz_currentmemorycontext()->free;
f->z.opaque = fz_currentmemorycontext();
f->z.next_in = nil;
f->z.avail_in = 0;
ei = deflateInit(&f->z, effort);
if (ei != Z_OK) {
eo = fz_throw("ioerror: deflateInit: %s", f->z.msg);
fz_free(f);
return eo;
}
return nil;
}
void
fz_freeflatee(fz_filter *f)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
err = deflateEnd(zp);
if (err != Z_OK)
fprintf(stderr, "deflateEnd: %s", zp->msg);
fz_free(f);
}
fz_error *
fz_processflatee(fz_filter *f, fz_buffer *in, fz_buffer *out)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
zp->next_in = in->rp;
zp->avail_in = in->wp - in->rp;
zp->next_out = out->wp;
zp->avail_out = out->ep - out->wp;
err = deflate(zp, in->eof ? Z_FINISH : Z_NO_FLUSH);
in->rp = in->wp - zp->avail_in;
out->wp = out->ep - zp->avail_out;
if (err == Z_STREAM_END) {
out->eof = 1;
return fz_iodone;
}
else if (err == Z_OK) {
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
return fz_ioneedin; /* hmm? */
}
else {
return fz_throw("ioerror: deflate: %s", zp->msg);
}
}
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