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cmFilePathUuid: Use Base32 string instead of Base64 string 

This produces files that will not collide on a case-insensitive
filesystem.  It also avoids the need for special character
substitutions.
This commit is contained in:
Sebastian Holtermann 2016-09-01 13:17:58 +02:00 committed by Brad King
parent b481ddb3df
commit 228f4e9b33
1 changed files with 7 additions and 13 deletions
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20
Source/cmFilePathUuid.cxx
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@ -12,10 +12,10 @@
#include "cmFilePathUuid.h"
#include "cmBase32.h"
#include "cmCryptoHash.h"
#include "cmMakefile.h"
#include "cmSystemTools.h"
#include "cmsys/Base64.h"
cmFilePathUuid::cmFilePathUuid(cmMakefile* makefile)
{
@ -111,22 +111,16 @@ std::string cmFilePathUuid::GetChecksumString(
const std::string& sourceFilename, const std::string& sourceRelPath,
const std::string& sourceRelSeed)
{
std::string checksumBase64;
std::string checksumBase32;
{
// Calculate the file ( seed + relative path + name ) checksum
std::vector<unsigned char> hashBytes =
cmCryptoHash::New("SHA256")->ByteHashString(
(sourceRelSeed + sourceRelPath + sourceFilename).c_str());
// Convert hash bytes to Base64 text string
std::vector<unsigned char> base64Bytes(hashBytes.size() * 2, 0);
cmsysBase64_Encode(&hashBytes[0], hashBytes.size(), &base64Bytes[0], 0);
checksumBase64 = reinterpret_cast<const char*>(&base64Bytes[0]);
}
// Base64 allows '/', '+' and '=' characters which are problematic
// when used in file names. Replace them with safer alternatives.
std::replace(checksumBase64.begin(), checksumBase64.end(), '/', '-');
std::replace(checksumBase64.begin(), checksumBase64.end(), '+', '_');
std::replace(checksumBase64.begin(), checksumBase64.end(), '=', '_');
return checksumBase64;
checksumBase32 =
cmBase32Encoder().encodeString(&hashBytes[0], hashBytes.size(), false);
}
return checksumBase32;
}