medvedych/harbour-books
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[app] Store book's MD-5 hash as xattr if the filesystem allows it

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This significantly speeds up the process of scanning downloads for
new books. The attribute name is "user.harbour-books.md5-hash"
This commit is contained in:
Slava Monich 2015-07-16 00:01:04 +03:00
parent b108c25f25
commit 481d42d616
1 changed files with 28 additions and 4 deletions
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28
app/src/BooksImportModel.cpp
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@ -35,12 +35,20 @@
#include "BooksStorage.h"
#include "BooksTask.h"
#include "BooksUtil.h"
#include "BooksDefs.h"
#include "HarbourDebug.h"
#include <QDir>
#include <QCryptographicHash>
#include <attr/xattr.h>
#include <errno.h>
#define DIGEST_XATTR "user." BOOKS_APP_NAME ".md5-hash"
#define DIGEST_TYPE (QCryptographicHash::Md5)
#define DIGEST_SIZE (16)
enum BooksImportRole {
BooksImportRoleTitle = Qt::UserRole,
BooksImportRoleBook,
@ -124,7 +132,7 @@ QByteArray BooksImportModel::Task::calculateFileHash(QString aPath)
QFile file(aPath);
if (file.open(QIODevice::ReadOnly)) {
qint64 len = 0;
QCryptographicHash hash(QCryptographicHash::Md5);
QCryptographicHash hash(DIGEST_TYPE);
hash.reset();
if (!iBuf) iBuf = new char[iBufSize];
while (!isCanceled() && (len = file.read(iBuf, iBufSize)) > 0) {
@ -133,6 +141,7 @@ QByteArray BooksImportModel::Task::calculateFileHash(QString aPath)
if (len == 0) {
if (!isCanceled()) {
result = hash.result();
HASSERT(result.size() == DIGEST_SIZE);
HDEBUG(qPrintable(aPath) << QString(result.toHex()));
}
} else {
@ -148,9 +157,24 @@ QByteArray BooksImportModel::Task::getFileHash(QString aPath)
if (iFileHash.contains(aPath)) {
return iFileHash.value(aPath);
} else {
QByteArray hash = calculateFileHash(aPath);
QByteArray hash;
char attr[DIGEST_SIZE];
QByteArray fname = aPath.toLocal8Bit();
if (getxattr(fname, DIGEST_XATTR, attr, sizeof(attr)) == DIGEST_SIZE) {
hash = QByteArray(attr, sizeof(attr));
HDEBUG(qPrintable(aPath) << QString(hash.toHex()));
} else {
hash = calculateFileHash(aPath);
if (hash.size() == DIGEST_SIZE &&
setxattr(fname, DIGEST_XATTR, hash, hash.size(), 0)) {
HDEBUG("Failed to set " DIGEST_XATTR " xattr on" <<
fname.constData() << ":" << strerror(errno));
}
}
if (hash.size() == DIGEST_SIZE) {
iFileHash.insert(aPath, hash);
iHashFile.insert(hash, aPath);
}
return hash;
}
}