Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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77 lines
2.0 KiB
77 lines
2.0 KiB
13 years ago
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#include <stdlib.h>
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#include "upb/bytestream.h"
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#include "upb/pb/decoder.h"
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#include "upb/pb/glue.h"
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#include "upb/pb/textprinter.h"
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int main(int argc, char *argv[]) {
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if (argc < 3) {
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fprintf(stderr, "Usage: stream_transcode <descfile> <msgname>\n");
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return 1;
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}
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upb_symtab *symtab = upb_symtab_new();
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size_t desc_len;
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const char *desc = upb_readfile(argv[1], &desc_len);
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if (!desc) {
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fprintf(stderr, "Couldn't open descriptor file: %s\n", argv[1]);
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return 1;
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}
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upb_status status = UPB_STATUS_INIT;
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upb_load_descriptor_into_symtab(symtab, desc, desc_len, &status);
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if (!upb_ok(&status)) {
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fprintf(stderr, "Error parsing descriptor: %s", upb_status_getstr(&status));
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return 1;
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}
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free((void*)desc);
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const upb_def *md = upb_symtab_lookup(symtab, argv[2]);
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if (!md) {
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fprintf(stderr, "Descriptor did not contain message: %s\n", argv[2]);
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return 1;
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}
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const upb_msgdef *m = upb_dyncast_msgdef_const(md);
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if (!m) {
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fprintf(stderr, "Def was not a msgdef.\n");
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return 1;
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}
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upb_stdio in, out;
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upb_stdio_init(&in);
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upb_stdio_init(&out);
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upb_stdio_reset(&in, stdin);
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upb_stdio_reset(&out, stdout);
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upb_handlers *handlers = upb_handlers_new();
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upb_textprinter *p = upb_textprinter_new();
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upb_textprinter_reset(p, upb_stdio_bytesink(&out), false);
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upb_textprinter_reghandlers(handlers, m);
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upb_decoder d;
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upb_decoder_init(&d, handlers);
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upb_decoder_reset(&d, upb_stdio_bytesrc(&in), 0, UPB_NONDELIMITED, p);
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upb_status_clear(&status);
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upb_decoder_decode(&d, &status);
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if (!upb_ok(&status)) {
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fprintf(stderr, "Error parsing input: %s", upb_status_getstr(&status));
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}
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upb_status_uninit(&status);
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upb_stdio_uninit(&in);
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upb_stdio_uninit(&out);
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upb_decoder_uninit(&d);
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upb_textprinter_free(p);
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upb_def_unref(UPB_UPCAST(m));
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upb_symtab_unref(symtab);
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// Prevent C library from holding buffers open, so Valgrind doesn't see
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// memory leaks.
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fclose(stdin);
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fclose(stdout);
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}
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