static void
pdc_end_compress(pdc_output *out)
{
int status;
pdc_core *pdc = out->pdc;
/* this may happen during cleanup triggered by an exception handler */
if (!out->compressing)
return;
if (!pdc_get_compresslevel(out)) {
out->compressing = pdc_false;
return;
}
#ifdef HAVE_LIBZ
/* Finish the stream */
do {
pdc_check_stream(out, 128);
out->z.next_out = (Bytef *) out->curpos;
out->z.avail_out = (uInt) (out->maxpos - out->curpos);
status = deflate(&(out->z), Z_FINISH);
out->curpos = out->z.next_out;
if (status != Z_STREAM_END && status != Z_OK)
pdc_error(pdc, PDC_E_IO_COMPRESS, "Z_FINISH", 0, 0, 0);
} while (status != Z_STREAM_END);
out->compressing = pdc_false;
#endif /* HAVE_LIBZ */
}
static void
pdc_check_stream(pdc_output *out, size_t len)
{
size_t max;
int cur;
pdc_stream *stream = &out->stream;
pdc_core *pdc = out->pdc;
if (stream->curpos + len <= stream->maxpos)
return;
pdc_flush_stream(out);
if (stream->curpos + len <= stream->maxpos)
return;
max = (size_t) (2*(stream->maxpos - stream->basepos));
cur = stream->curpos - stream->basepos;
stream->basepos = (pdc_byte *)
pdc_realloc(pdc, (void *) stream->basepos, max, "pdc_check_stream");
stream->maxpos = stream->basepos + max;
stream->curpos = stream->basepos + cur;
pdc_check_stream(out, len);
}
void
pdc_write(pdc_output *out, const void *data, size_t size)
{
pdc_stream *stream = &out->stream;
int estimate = 0;
pdc_core *pdc = out->pdc;
#ifdef HAVE_LIBZ
if (stream->compressing) {
stream->z.avail_in = (uInt) size;
stream->z.next_in = (Bytef *) data;
stream->z.avail_out = 0;
while (stream->z.avail_in > 0) {
if (stream->z.avail_out == 0) {
/* estimate output buffer size */
estimate = (int) (stream->z.avail_in/4 + 16);
pdc_check_stream(out, (size_t) estimate);
stream->z.next_out = (Bytef *) stream->curpos;
stream->z.avail_out = (uInt) (stream->maxpos - stream->curpos);
}
if (deflate(&(stream->z), Z_NO_FLUSH) != Z_OK)
pdc_error(pdc, PDC_E_IO_COMPRESS, "Z_NO_FLUSH", 0, 0, 0);
stream->curpos = stream->z.next_out;
}
} else {
#endif /* HAVE_LIBZ */
pdc_check_stream(out, size);
memcpy(stream->curpos, data, size);
stream->curpos += size;
#ifdef HAVE_LIBZ
}
#endif /* HAVE_LIBZ */
}
