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Use 'unsigned char' rather than 'char' for pchMessageStart.

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Regarding https://bitcointalk.org/index.php?topic=28022.0

main.cpp has: "char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };"
Per discussion on the thread linked, leaving the signedness of
pchMessageStart is unsafe for values > 0x80. This patch specifies
'unsigned char' in main.cpp and net.h.

Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Venkatesh Srinivas 2011-08-07 12:19:14 -04:00 committed by Jeff Garzik
parent eb20f3c8f5
commit 25133bd74b
2 changed files with 2 additions and 2 deletions
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2
src/main.cpp
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@ -1766,7 +1766,7 @@ bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
// The message start string is designed to be unlikely to occur in normal data. // The message start string is designed to be unlikely to occur in normal data.
// The characters are rarely used upper ascii, not valid as UTF-8, and produce // The characters are rarely used upper ascii, not valid as UTF-8, and produce
// a large 4-byte int at any alignment. // a large 4-byte int at any alignment.
char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 }; unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv) bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)

2
src/net.h
View file

@ -66,7 +66,7 @@ bool StopNode();
// (4) size // (4) size
// (4) checksum // (4) checksum
extern char pchMessageStart[4]; extern unsigned char pchMessageStart[4];
class CMessageHeader class CMessageHeader
{ {