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[原创]迷你封装第一蛋: 哈希文件类 QHashFile [复制链接]

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只看楼主 倒序阅读 楼主  发表于: 2011-10-14
QHashFile
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  1. #include "qhashfile.h"


qhashfile.h
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  1. #ifndef QHASHFILE_H
  2. #define QHASHFILE_H
  4. #include <QtCore/QFile>
  5. #include <QtCore/QByteArray>
  6. #include <QtCore/QCryptographicHash>
  8. class QHashFile
  9. {
  10.     public:
  11.     static QByteArray hash(QFile *file, QCryptographicHash::Algorithm method = QCryptographicHash::Md5);
  12.     static QByteArray hash(const QString &fileName, QCryptographicHash::Algorithm method = QCryptographicHash::Md5);
  13. };
  15. #endif//QHASHFILE_H

qhashfile.cpp
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  1. /*
  2.   Publish by Eric Chow at 2011/10/14.
  3.   E-Mail: echow.always@live.com.
  4. */
  6. /*!
  7.   \class QHashFile
  8.   \brief The QHashFile class is tool class for fast hash file.
  9. */
  11. #include "qhashfile.h"
  13. /*!
  14.   \fn QByteArray QHashFile::hash(QFile *file, QCryptographicHash::Algorithm method)
  15.   \brief Hash file with the file object \a file and the specific method \a method, and return the result.
  16. */
  17. QByteArray QHashFile::hash(QFile *file, QCryptographicHash::Algorithm method)
  18. {
  19.     Q_CHECK_PTR(file);
  21.     if ((!file) || (!file->isReadable())) {
  22.         return QByteArray();
  23.     }
  25.     if (file->pos() != 0) {
  26.         if (!file->seek(0)) {
  27.             return QByteArray();
  28.         }
  29.     }
  31.     QCryptographicHash hash(method);
  33.     char buffer[2048] = {0};
  34.     qint64 numberOfReadBytes = 0;
  35.     qint64 remainingBytes = file->size();
  37.     while (remainingBytes) {
  38.         numberOfReadBytes = remainingBytes > 2048 ? 2048 : remainingBytes;
  39.         if (numberOfReadBytes == file->read(buffer, numberOfReadBytes))
  40.             hash.addData(buffer, numberOfReadBytes);
  41.         else
  42.             return QByteArray();
  43.         remainingBytes -= numberOfReadBytes;
  44.     }
  46.     return hash.result();
  47. }
  49. /*!
  50.   \fn QByteArray QHashFile::hash(const QString &fileName, QCryptographicHash::Algorithm method)
  51.   \brief Hash file with the file name \a fileName and the specific method \a method, and return the result.
  52. */
  53. QByteArray QHashFile::hash(const QString &fileName, QCryptographicHash::Algorithm method)
  54. {
  55.     QByteArray result;
  56.     QFile file(fileName);
  57.     if (file.open(QFile::ReadOnly)) {
  58.         result = hash(&file, method);
  59.         file.close();
  60.     }
  61.     return result;
  62. }
附件: hashfile.rar (2 K) 下载次数:5
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只看该作者 1楼 发表于: 2011-10-15
挺不错的，最后要输出的化要toHex();
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