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Check if tag is equal to 0

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This is needed because in the syntax of Google protobuf the zero
value is not valid tag value. The specification
(https://developers.google.com/protocol-buffers/docs/proto3) says
that "The smallest tag number you can specify is 1, and the largest
is 2^29-1, or 536,870,911."
This commit is contained in:
Italo Guerrieri 2017-11-29 18:04:03 +01:00
parent dac1a65fea
commit 565118bf26
1 changed files with 5 additions and 0 deletions
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5
protobuf-c/protobuf-c.c
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@ -2072,6 +2072,11 @@ parse_tag_and_wiretype(size_t len,
unsigned shift = 4;
unsigned rv;
/* 0 is not a valid tag value */
if ((data[0] & 0xf8) == 0) {
return 0;
}
*wiretype_out = data[0] & 7;
if ((data[0] & 0x80) == 0) {
*tag_out = tag;