src/LockedFile.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // LameXP - Audio Encoder Front-End
   3 // Copyright (C) 2004-2012 LoRd_MuldeR <MuldeR2@GMX.de>
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 2 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License along
  16 // with this program; if not, write to the Free Software Foundation, Inc.,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 // http://www.gnu.org/licenses/gpl-2.0.txt
  20 ///////////////////////////////////////////////////////////////////////////////
  21
  22 #include "LockedFile.h"
  23 #include "Global.h"
  24
  25 #include <QResource>
  26 #include <QFile>
  27 #include <QFileInfo>
  28 #include <QDir>
  29 #include <QCryptographicHash>
  30 #include <QKeccakHash>
  31
  32 #include <stdio.h>
  33 #include <io.h>
  34 #include <fcntl.h>
  35
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 #define THROW(STR)                                      \
  39 {                                                                       \
  40         char error_msg[512];                    \
  41         strcpy_s(error_msg, 512, STR);  \
  42         throw error_msg;                                \
  43 }
  44
  45 // WARNING: Passing file descriptors into Qt does NOT work with dynamically linked CRT!
  46 #ifdef QT_NODLL
  47         static const bool g_useFileDescr = 1;
  48 #else
  49         static const bool g_useFileDescr = 0;
  50 #endif
  51
  52 ///////////////////////////////////////////////////////////////////////////////
  53
  54 static const char *g_blnk = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef";
  55 static const char *g_seed = "c375d83b4388329408dfcbb4d9a065b6e06d28272f25ef299c70b506e26600af79fd2f866ae24602daf38f25c9d4b7e1";
  56 static const char *g_salt = "ee9f7bdabc170763d2200a7e3030045aafe380011aefc1730e547e9244c62308aac42a976feeca224ba553de0c4bb883";
  57
  58 static QByteArray fileHash(QFile &file)
  59 {
  60         QByteArray hash = QByteArray::fromHex(g_blnk);
  61
  62         if(file.isOpen() && file.reset())
  63         {
  64                 QKeccakHash keccak;
  65
  66                 QByteArray data = file.readAll();
  67                 QByteArray seed = QByteArray::fromHex(g_seed);
  68                 QByteArray salt = QByteArray::fromHex(g_salt);
  69
  70                 if(keccak.startBatch(QKeccakHash::hb384))
  71                 {
  72                         bool ok[3];
  73                         ok[0] = keccak.putBatch(seed);
  74                         ok[1] = keccak.putBatch(data);
  75                         ok[2] = keccak.putBatch(salt);
  76                         if(ok[0] && ok[1] && ok[2])
  77                         {
  78                                 if(keccak.stopBatch())
  79                                 {
  80                                         hash = keccak.toHex();
  81                                 }
  82                         }
  83                 }
  84         }
  85
  86         return hash;
  87 }
  88
  89 ///////////////////////////////////////////////////////////////////////////////
  90
  91 LockedFile::LockedFile(const QString &resourcePath, const QString &outPath, const QByteArray &expectedHash)
  92 {
  93         m_fileHandle = NULL;
  94         QResource resource(resourcePath);
  95
  96         //Make sure the resource is valid
  97         if(!resource.isValid())
  98         {
  99                 THROW(QString("Resource '%1' is invalid!").arg(QFileInfo(resourcePath).absoluteFilePath().replace(QRegExp("^:/"), QString())).toUtf8().constData());
 100         }
 101
 102         QFile outFile(outPath);
 103         m_filePath = QFileInfo(outFile).absoluteFilePath();
 104
 105         //Open output file
 106         for(int i = 0; i < 64; i++)
 107         {
 108                 if(outFile.open(QIODevice::WriteOnly)) break;
 109                 if(!i) qWarning("Failed to open file on first attemp, retrying...");
 110                 Sleep(100);
 111         }
 112
 113         //Write data to file
 114         if(outFile.isOpen() && outFile.isWritable())
 115         {
 116                 if(outFile.write(reinterpret_cast<const char*>(resource.data()), resource.size()) != resource.size())
 117                 {
 118                         QFile::remove(QFileInfo(outFile).canonicalFilePath());
 119                         THROW(QString("File '%1' could not be written!").arg(QFileInfo(outFile).fileName()).toUtf8().constData());
 120                 }
 121                 outFile.close();
 122         }
 123         else
 124         {
 125                 THROW(QString("File '%1' could not be created!").arg(QFileInfo(outFile).fileName()).toUtf8().constData());
 126         }
 127
 128         //Now lock the file!
 129         for(int i = 0; i < 64; i++)
 130         {
 131                 m_fileHandle = CreateFileW(QWCHAR(QDir::toNativeSeparators(m_filePath)), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
 132                 if((m_fileHandle != NULL) && (m_fileHandle != INVALID_HANDLE_VALUE)) break;
 133                 if(!i) qWarning("Failed to lock file on first attemp, retrying...");
 134                 Sleep(100);
 135         }
 136
 137         //Locked successfully?
 138         if((m_fileHandle == NULL) || (m_fileHandle == INVALID_HANDLE_VALUE))
 139         {
 140                 QFile::remove(QFileInfo(outFile).canonicalFilePath());
 141                 char error_msg[512];
 142                 strcpy_s(error_msg, 512, QString("File '%1' could not be locked!").arg(QFileInfo(outFile).fileName()).toLatin1().constData());
 143                 throw error_msg;
 144         }
 145
 146         //Open file for reading
 147         if(g_useFileDescr)
 148         {
 149                 int fd = _open_osfhandle(reinterpret_cast<intptr_t>(m_fileHandle), _O_RDONLY | _O_BINARY);
 150                 if(fd >= 0) outFile.open(fd, QIODevice::ReadOnly);
 151         }
 152         else
 153         {
 154                 for(int i = 0; i < 64; i++)
 155                 {
 156                         if(outFile.open(QIODevice::ReadOnly)) break;
 157                         if(!i) qWarning("Failed to re-open file on first attemp, retrying...");
 158                         Sleep(100);
 159                 }
 160         }
 161
 162         //Verify file contents
 163         QByteArray hash;
 164         if(outFile.isOpen())
 165         {
 166                 hash = fileHash(outFile);
 167                 outFile.close();
 168         }
 169         else
 170         {
 171                 QFile::remove(m_filePath);
 172                 THROW(QString("File '%1' could not be read!").arg(QFileInfo(outFile).fileName()).toLatin1().constData());
 173         }
 174
 175         //Compare hashes
 176         if(hash.isNull() || _stricmp(hash.constData(), expectedHash.constData()))
 177         {
 178                 qWarning("\nFile checksum error:\n A = %s\n B = %s\n", expectedHash.constData(), hash.constData());
 179                 LAMEXP_CLOSE(m_fileHandle);
 180                 QFile::remove(m_filePath);
 181                 THROW(QString("File '%1' is corruputed, take care!").arg(QFileInfo(resourcePath).absoluteFilePath().replace(QRegExp("^:/"), QString())).toLatin1().constData());
 182         }
 183 }
 184
 185 LockedFile::LockedFile(const QString &filePath)
 186 {
 187         m_fileHandle = NULL;
 188         QFileInfo existingFile(filePath);
 189         existingFile.setCaching(false);
 190
 191         //Make sure the file exists, before we try to lock it
 192         if(!existingFile.exists())
 193         {
 194                 char error_msg[256];
 195                 strcpy_s(error_msg, 256, QString("File '%1' does not exist!").arg(existingFile.fileName()).toLatin1().constData());
 196                 throw error_msg;
 197         }
 198
 199         //Remember file path
 200         m_filePath = existingFile.canonicalFilePath();
 201
 202         //Now lock the file
 203         for(int i = 0; i < 64; i++)
 204         {
 205                 m_fileHandle = CreateFileW(QWCHAR(QDir::toNativeSeparators(filePath)), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
 206                 if((m_fileHandle != NULL) && (m_fileHandle != INVALID_HANDLE_VALUE)) break;
 207                 if(!i) qWarning("Failed to lock file on first attemp, retrying...");
 208                 Sleep(100);
 209         }
 210
 211         //Locked successfully?
 212         if((m_fileHandle == NULL) || (m_fileHandle == INVALID_HANDLE_VALUE))
 213         {
 214                 THROW(QString("File '%1' could not be locked!").arg(existingFile.fileName()).toLatin1().constData());
 215         }
 216 }
 217
 218 LockedFile::~LockedFile(void)
 219 {
 220         LAMEXP_CLOSE(m_fileHandle);
 221 }
 222
 223 const QString &LockedFile::filePath()
 224 {
 225         return m_filePath;
 226 }