Add QMimeType::aliases().

Requested by Allan Sandfeld Jensen for QWebkit, which needs to register
upfront all the mimetypes that a given plugin can handle.

Change-Id: I64b8d39c7988adfc7db4ed8bfdc73acd16e999da
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

4 files changed, 50 insertions, 0 deletions

diff --git a/src/corelib/mimetypes/qmimeprovider.cpp b/src/corelib/mimetypes/qmimeprovider.cpp
index 91ef7efede..78cfc469f5 100644
--- a/src/corelib/mimetypes/qmimeprovider.cpp
+++ b/src/corelib/mimetypes/qmimeprovider.cpp
@@ -494,6 +494,29 @@ QString QMimeBinaryProvider::resolveAlias(const QString &name)
     return name;
 }
 
+QStringList QMimeBinaryProvider::listAliases(const QString &name)
+{
+    checkCache();
+    QStringList result;
+    const QByteArray input = name.toLatin1();
+    foreach (CacheFile *cacheFile, m_cacheFiles) {
+        const int aliasListOffset = cacheFile->getUint32(PosAliasListOffset);
+        const int numEntries = cacheFile->getUint32(aliasListOffset);
+        for (int pos = 0; pos < numEntries; ++pos) {
+            const int off = aliasListOffset + 4 + 8 * pos;
+            const int mimeOffset = cacheFile->getUint32(off + 4);
+            const char *mimeType = cacheFile->getCharStar(mimeOffset);
+
+            if (input == mimeType) {
+                const int aliasOffset = cacheFile->getUint32(off);
+                const char *alias = cacheFile->getCharStar(aliasOffset);
+                result.append(QString::fromLatin1(alias));
+            }
+        }
+    }
+    return result;
+}
+
 void QMimeBinaryProvider::loadMimeTypeList()
 {
     if (!m_mimetypeListLoaded) {
@@ -815,6 +838,13 @@ void QMimeXMLProvider::addParent(const QString &child, const QString &parent)
     m_parents[child].append(parent);
 }
 
+QStringList QMimeXMLProvider::listAliases(const QString &name)
+{
+    ensureLoaded();
+    // Iterate through the whole hash. This method is rarely used.
+    return m_aliases.keys(name);
+}
+
 QString QMimeXMLProvider::resolveAlias(const QString &name)
 {
     ensureLoaded();
diff --git a/src/corelib/mimetypes/qmimeprovider_p.h b/src/corelib/mimetypes/qmimeprovider_p.h
index dd35f3c341..8727820ce4 100644
--- a/src/corelib/mimetypes/qmimeprovider_p.h
+++ b/src/corelib/mimetypes/qmimeprovider_p.h
@@ -61,6 +61,7 @@ public:
     virtual QStringList findByFileName(const QString &fileName, QString *foundSuffix) = 0;
     virtual QStringList parents(const QString &mime) = 0;
     virtual QString resolveAlias(const QString &name) = 0;
+    virtual QStringList listAliases(const QString &name) = 0;
     virtual QMimeType findByMagic(const QByteArray &data, int *accuracyPtr) = 0;
     virtual QList<QMimeType> allMimeTypes() = 0;
     virtual void loadMimeTypePrivate(QMimeTypePrivate &) {}
@@ -87,6 +88,7 @@ public:
     virtual QStringList findByFileName(const QString &fileName, QString *foundSuffix);
     virtual QStringList parents(const QString &mime);
     virtual QString resolveAlias(const QString &name);
+    virtual QStringList listAliases(const QString &name);
     virtual QMimeType findByMagic(const QByteArray &data, int *accuracyPtr);
     virtual QList<QMimeType> allMimeTypes();
     virtual void loadMimeTypePrivate(QMimeTypePrivate &);
@@ -128,6 +130,7 @@ public:
     virtual QStringList findByFileName(const QString &fileName, QString *foundSuffix);
     virtual QStringList parents(const QString &mime);
     virtual QString resolveAlias(const QString &name);
+    virtual QStringList listAliases(const QString &name);
     virtual QMimeType findByMagic(const QByteArray &data, int *accuracyPtr);
     virtual QList<QMimeType> allMimeTypes();
 
diff --git a/src/corelib/mimetypes/qmimetype.cpp b/src/corelib/mimetypes/qmimetype.cpp
index 9be613924e..80510bc914 100644
--- a/src/corelib/mimetypes/qmimetype.cpp
+++ b/src/corelib/mimetypes/qmimetype.cpp
@@ -350,6 +350,22 @@ QStringList QMimeType::allAncestors() const
 }
 
 /*!
+    Return the list of aliases of this mimetype.
+
+    For instance, for text/csv, the returned list would be:
+    text/x-csv, text/x-comma-separated-values.
+
+    Note that all QMimeType instances refer to proper mimetypes,
+    never to aliases directly.
+
+    The order of the aliases in the list is undefined.
+*/
+QStringList QMimeType::aliases() const
+{
+    return QMimeDatabasePrivate::instance()->provider()->listAliases(d->name);
+}
+
+/*!
     Returns the known suffixes for the MIME type.
     No leading dot is included, so for instance this would return "jpg", "jpeg" for image/jpeg.
  */
diff --git a/src/corelib/mimetypes/qmimetype.h b/src/corelib/mimetypes/qmimetype.h
index e77a7a08a7..150a799d40 100644
--- a/src/corelib/mimetypes/qmimetype.h
+++ b/src/corelib/mimetypes/qmimetype.h
@@ -90,6 +90,7 @@ public:
     QStringList globPatterns() const;
     QStringList parentMimeTypes() const;
     QStringList allAncestors() const;
+    QStringList aliases() const;
     QStringList suffixes() const;
     QString preferredSuffix() const;