From 6bdbb45e88e7b88b294dfb6e4cb493cbc3c8cf74 Mon Sep 17 00:00:00 2001
From: Joshua Haberman <joshua@reverberate.org>
Date: Sun, 13 Feb 2011 12:59:54 -0800
Subject: Merged core/ and stream/ -> src/.  The split wasn't worth it.

---
 src/upb_decoder.h | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/upb_decoder.h

(limited to 'src/upb_decoder.h')

diff --git a/src/upb_decoder.h b/src/upb_decoder.h
new file mode 100644
index 0000000..1c62753
--- /dev/null
+++ b/src/upb_decoder.h
@@ -0,0 +1,86 @@
+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * upb_decoder implements a high performance, streaming decoder for protobuf
+ * data that works by implementing upb_src and getting its data from a
+ * upb_bytesrc.
+ *
+ * The decoder does not currently support non-blocking I/O, in the sense that
+ * if the bytesrc returns UPB_STATUS_TRYAGAIN it is not possible to resume the
+ * decoder when data becomes available again.  Support for this could be added,
+ * but it would add complexity and perhaps cost efficiency also.
+ *
+ * Copyright (c) 2009-2010 Joshua Haberman.  See LICENSE for details.
+ */
+
+#ifndef UPB_DECODER_H_
+#define UPB_DECODER_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "upb_def.h"
+#include "upb_stream.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* upb_decoder *****************************************************************/
+
+// The decoder keeps a stack with one entry per level of recursion.
+// upb_decoder_frame is one frame of that stack.
+typedef struct {
+  upb_msgdef *msgdef;
+  size_t end_offset;  // For groups, 0.
+} upb_decoder_frame;
+
+struct _upb_decoder {
+  // Immutable state of the decoder.
+  upb_src src;
+  upb_dispatcher dispatcher;
+  upb_bytesrc *bytesrc;
+  upb_msgdef *toplevel_msgdef;
+  upb_decoder_frame stack[UPB_MAX_NESTING];
+
+  // Mutable state of the decoder.
+
+  // Where we will store any errors that occur.
+  upb_status *status;
+
+  // Stack entries store the offset where the submsg ends (for groups, 0).
+  upb_decoder_frame *top, *limit;
+
+  // Current input buffer.
+  upb_string *buf;
+
+  // Temporary string for passing to callbacks.
+  upb_string *tmp;
+
+  // The offset within the overall stream represented by the *beginning* of buf.
+  size_t buf_stream_offset;
+};
+
+// A upb_decoder decodes the binary protocol buffer format, writing the data it
+// decodes to a upb_sink.
+struct _upb_decoder;
+typedef struct _upb_decoder upb_decoder;
+
+// Allocates and frees a upb_decoder, respectively.
+void upb_decoder_init(upb_decoder *d, upb_msgdef *md);
+void upb_decoder_uninit(upb_decoder *d);
+
+// Resets the internal state of an already-allocated decoder.  This puts it in a
+// state where it has not seen any data, and expects the next data to be from
+// the beginning of a new protobuf.  Parsers must be reset before they can be
+// used.  A decoder can be reset multiple times.
+void upb_decoder_reset(upb_decoder *d, upb_bytesrc *bytesrc);
+
+// Returns a upb_src pointer by which the decoder can be used.  The returned
+// upb_src is invalidated by upb_decoder_reset() or upb_decoder_free().
+upb_src *upb_decoder_src(upb_decoder *d);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* UPB_DECODER_H_ */
-- 
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