GuOut
gu_init_out(GuOutStream* stream)
{
gu_require(stream != NULL);
GuOut out = {
.buf_end = NULL,
.buf_curr = 0,
.stream = stream,
.fini.fn = NULL
};
return out;
}
static bool
gu_out_is_buffering(GuOut* out)
{
return !!out->buf_end;
}
static void
gu_out_end_buf(GuOut* out, GuExn* err)
{
if (!gu_out_is_buffering(out)) {
return;
}
GuOutStream* stream = out->stream;
size_t curr_len = ((ptrdiff_t)out->buf_size) + out->buf_curr;
stream->end_buf(stream, curr_len, err);
out->buf_end = NULL;
out->buf_size = out->buf_curr = 0;
}
static bool
gu_out_begin_buf(GuOut* out, size_t req, GuExn* err)
{
GuOutStream* stream = out->stream;
if (gu_out_is_buffering(out)) {
if (out->buf_curr < 0) {
return true;
} else {
gu_out_end_buf(out, err);
if (!gu_ok(err)) {
return false;
}
}
}
if (stream->begin_buf) {
size_t sz = 0;
uint8_t* buf = stream->begin_buf(stream, req, &sz, err);
gu_assert(sz <= PTRDIFF_MAX);
if (buf) {
out->buf_end = &buf[sz];
out->buf_curr = -(ptrdiff_t) sz;
out->buf_size = sz;
return true;
}
}
return false;
}
static void
gu_out_end_buf(GuOut* out, GuExn* err)
{
if (!gu_out_is_buffering(out)) {
return;
}
GuOutStream* stream = out->stream;
size_t curr_len = ((ptrdiff_t)out->buf_size) + out->buf_curr;
stream->end_buf(stream, curr_len, err);
out->buf_end = NULL;
out->buf_size = out->buf_curr = 0;
}