Sync with internal Google development.

This breaks the open-source build, will
follow up with a change to fix it.

1 files changed, 76 insertions, 0 deletions

diff --git a/examples/stream_transcode.c b/examples/stream_transcode.c
new file mode 100644
index 0000000..21c375b
--- /dev/null
+++ b/examples/stream_transcode.c
@@ -0,0 +1,76 @@
+
+#include <stdlib.h>
+#include "upb/bytestream.h"
+#include "upb/pb/decoder.h"
+#include "upb/pb/glue.h"
+#include "upb/pb/textprinter.h"
+
+int main(int argc, char *argv[]) {
+  if (argc < 3) {
+    fprintf(stderr, "Usage: stream_transcode <descfile> <msgname>\n");
+    return 1;
+  }
+
+  upb_symtab *symtab = upb_symtab_new();
+  size_t desc_len;
+  const char *desc = upb_readfile(argv[1], &desc_len);
+  if (!desc) {
+    fprintf(stderr, "Couldn't open descriptor file: %s\n", argv[1]);
+    return 1;
+  }
+
+  upb_status status = UPB_STATUS_INIT;
+  upb_load_descriptor_into_symtab(symtab, desc, desc_len, &status);
+  if (!upb_ok(&status)) {
+    fprintf(stderr, "Error parsing descriptor: %s", upb_status_getstr(&status));
+    return 1;
+  }
+  free((void*)desc);
+
+  const upb_def *md = upb_symtab_lookup(symtab, argv[2]);
+  if (!md) {
+    fprintf(stderr, "Descriptor did not contain message: %s\n", argv[2]);
+    return 1;
+  }
+
+  const upb_msgdef *m = upb_dyncast_msgdef_const(md);
+  if (!m) {
+    fprintf(stderr, "Def was not a msgdef.\n");
+    return 1;
+  }
+
+  upb_stdio in, out;
+  upb_stdio_init(&in);
+  upb_stdio_init(&out);
+  upb_stdio_reset(&in, stdin);
+  upb_stdio_reset(&out, stdout);
+
+  upb_handlers *handlers = upb_handlers_new();
+  upb_textprinter *p = upb_textprinter_new();
+  upb_textprinter_reset(p, upb_stdio_bytesink(&out), false);
+  upb_textprinter_reghandlers(handlers, m);
+
+  upb_decoder d;
+  upb_decoder_init(&d, handlers);
+  upb_decoder_reset(&d, upb_stdio_bytesrc(&in), 0, UPB_NONDELIMITED, p);
+
+  upb_status_clear(&status);
+  upb_decoder_decode(&d, &status);
+
+  if (!upb_ok(&status)) {
+    fprintf(stderr, "Error parsing input: %s", upb_status_getstr(&status));
+  }
+
+  upb_status_uninit(&status);
+  upb_stdio_uninit(&in);
+  upb_stdio_uninit(&out);
+  upb_decoder_uninit(&d);
+  upb_textprinter_free(p);
+  upb_def_unref(UPB_UPCAST(m));
+  upb_symtab_unref(symtab);
+
+  // Prevent C library from holding buffers open, so Valgrind doesn't see
+  // memory leaks.
+  fclose(stdin);
+  fclose(stdout);
+}