395 lines
8.8 KiB
Plaintext
395 lines
8.8 KiB
Plaintext
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/*
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* Copyright 2002-2013 Haiku Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Tyler Dauwalder
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* Vincent Dominguez
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* John Scipione, jscipione@gmail.com
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* Ingo Weinhold, bonefish@users.sf.net
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*
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* Corresponds to:
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* headers/os/storage/Volume.h hrev45306
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* src/kits/storage/Volume.cpp hrev45306
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*/
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/*!
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\file Volume.h
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\ingroup storage
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\ingroup libbe
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\brief Provides the BVolume class.
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*/
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/*!
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\class BVolume
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\ingroup storage
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\ingroup libbe
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\brief Provides an interface for querying information about a volume.
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The class is a simple wrapper for a \c dev_t and the function
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fs_stat_dev(). The sole exception is the SetName() method which
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sets the name of the volume.
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*/
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/*!
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\fn BVolume::BVolume()
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\brief Creates an uninitialized BVolume object.
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InitCheck() will return \c B_NO_INIT.
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\see SetTo()
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*/
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/*!
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\fn BVolume::BVolume(dev_t device)
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\brief Creates a BVolume and initializes it to the volume specified
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by the supplied device ID.
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InitCheck() should be called afterwards to check if initialization was
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successful.
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\param device The device ID of the volume.
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*/
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/*!
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\fn BVolume::BVolume(const BVolume &volume)
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\brief Creates a copy of the supplied BVolume object.
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Afterwards the object refers to the same device the supplied object
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does. If the latter is not properly initialized, this result isn't
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either.
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\param volume The volume object to be copied.
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*/
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/*!
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\fn BVolume::~BVolume()
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\brief Destroys the object and frees all associated resources.
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*/
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/*!
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\name Constructor helper methods
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*/
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//! @{
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/*!
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\fn status_t BVolume::InitCheck(void) const
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\brief Returns the initialization status.
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\return \c B_OK if the object was properly initialized, or an error code
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otherwise.
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*/
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/*!
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\fn status_t BVolume::SetTo(dev_t device)
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\brief Initializes the object to refer to the volume specified by
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the supplied device ID.
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\param device The device ID of the volume to set.
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\return \c B_OK if the object was properly initialized, or an error code
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otherwise.
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*/
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/*!
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\fn void BVolume::Unset()
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\brief Brings the BVolume object to an uninitialized state.
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InitCheck() will return \c B_NO_INIT.
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*/
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//! @}
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/*!
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\name Volume information methods
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*/
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//! @{
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/*!
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\fn dev_t BVolume::Device() const
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\brief Returns the device ID of the volume the object refers to.
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\return Returns the device ID of the volume the object refers to
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or -1 if the object was not properly initialized.
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*/
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/*!
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\fn status_t BVolume::GetRootDirectory(BDirectory *directory) const
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\brief Writes the root directory of the volume referred to by this
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object into \a directory.
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\param directory A pointer to a pre-allocated BDirectory to be initialized
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to the volume's root directory.
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\return A status code.
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\retval B_OK Everything went fine.
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\retval B_BAD_VALUE \a directory was \c NULL or the object was not properly
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initialized.
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*/
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/*!
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\fn off_t BVolume::Capacity() const
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\brief Returns the total storage capacity of the volume.
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\return The volume's total storage capacity (in bytes), or \c B_BAD_VALUE
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if the object is not properly initialized.
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*/
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/*!
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\fn off_t BVolume::FreeBytes() const
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\brief Returns the amount of unused space on the volume (in bytes).
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\return The amount of unused space on the volume (in bytes), or
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\c B_BAD_VALUE if the object is not properly initialized.
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*/
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/*!
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\fn off_t BVolume::BlockSize() const
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\brief Returns the size of one block (in bytes). The meaning of this
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depends on the underlying file system.
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\return The block size in bytes, \c B_NO_INIT if the volume is not
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initialized or other errors forwarded from the file system.
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*/
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//! @}
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/*!
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\name Volume name methods
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*/
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//! @{
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/*!
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\fn status_t BVolume::GetName(char* name) const
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\brief Writes the volume's name into the provided buffer.
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\param name A pointer to a pre-allocated character buffer of size
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\c B_FILE_NAME_LENGTH or larger into which the name of the
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volume is written.
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\return A status code.
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\retval B_OK Everything went fine.
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\retval B_BAD_VALUE \a name was \c NULL or the object was not properly
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initialized.
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*/
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/*!
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\fn status_t BVolume::SetName(const char *name)
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\brief Sets the volume's name to \a name.
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\note The R5 implementation checks if an entry with the volume's old name
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exists in the root directory and renames that entry, if it is indeed
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the mount point of the volume (or a link referring to it). In all
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other cases, nothing is done (even if the mount point is named like
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the volume, but lives in a different directory). We follow suit for
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the time being.
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\warning If the volume name is set to "boot" this method tries to rename
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it to /boot, but is prevented by the kernel.
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\param name The new name of the volume, must not be longer than
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\c B_FILE_NAME_LENGTH (including the terminating \c NULL).
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\return A status code.
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\retval B_OK Everything went fine.
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\retval B_BAD_VALUE \a name was \c NULL or the object was not properly
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initialized.
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*/
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//! @}
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/*!
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\name Volume icon methods
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*/
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//! @{
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/*!
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\fn status_t BVolume::GetIcon(BBitmap *icon, icon_size which) const
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\brief Writes the volume's icon into the supplied BBitmap.
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\param icon A pointer to a pre-allocated BBitmap of the correct dimension
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to store the requested icon (16x16 for the mini and 32x32 for the
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large icon).
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\param which The icon size to be retrieved: \c B_MINI_ICON for the mini or
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\c B_LARGE_ICON for the large icon.
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*/
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/*!
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\fn status_t BVolume::GetIcon(uint8** _data, size_t* _size,
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type_code* _type) const
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\brief Writes the volume's icon data into the supplied \c uint8 array.
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\param _data A pointer to a pointer to a pre-allocated \c uint8 array of
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the correct size to store the requested icon.
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\param _size The size of the retrieved icon (in bytes).
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\param _type The type code of the retrieve icon.
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\returns A status code.
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\retval B_OK Everything went fine.
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\retval B_NO_INIT Object was not properly initialized.
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\see fs_stat_dev() for more return codes.
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\see get_device_icon() for more return codes.
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*/
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//! @}
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/*!
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\name Volume capability methods
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*/
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//! @{
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/*!
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\fn bool BVolume::IsRemovable() const
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\brief Returns whether or not the volume is removable.
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\return \c true, if the volume was properly initialized and is removable,
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\c false otherwise.
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*/
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/*!
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\fn bool BVolume::IsReadOnly(void) const
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\brief Returns whether or not the volume is read-only.
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\return \c true, if the volume was properly initialized and is read-only,
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\c false otherwise.
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*/
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/*!
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\fn bool BVolume::IsPersistent(void) const
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\brief Returns whether or not the volume is persistent.
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\return \c true, if the volume was properly initialized and is persistent,
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\c false otherwise.
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*/
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/*!
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\fn bool BVolume::IsShared(void) const
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\brief Returns whether or not the volume is shared.
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return \c true, if the volume was properly initialized and is shared,
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\c false otherwise.
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*/
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/*!
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\fn bool BVolume::KnowsMime(void) const
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\brief Returns whether or not the volume supports MIME-types.
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\return \c true, if the volume was properly initialized and supports
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MIME-types, \c false otherwise.
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*/
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/*!
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\fn bool BVolume::KnowsAttr(void) const
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\brief Returns whether or not the volume supports attributes.
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\return \c true, if the volume was properly initialized and supports
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attributes, \c false otherwise.
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*/
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/*!
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\fn bool BVolume::KnowsQuery(void) const
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\brief Returns whether or not the volume supports queries.
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\return \c true, if the volume was properly initialized and supports
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queries, \c false otherwise.
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*/
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//! @}
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/*!
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\name Operator overload methods
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*/
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//! @{
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/*!
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\fn bool BVolume::operator==(const BVolume &volume) const
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\brief Returns whether or not the supplied BVolume object is equal to this
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object.
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Two volume objects are said to be equal if they are both uninitialized,
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or they are both initialized and refer to the same volume.
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\param volume The volume to be tested for equality.
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\return \c true, if the objects are equal, \c false otherwise.
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*/
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/*!
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\fn bool BVolume::operator!=(const BVolume &volume) const
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\brief Returns whether or not the supplied BVolume object is NOT equal to
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this object.
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Two volume objects are said to be unequal if one is initialized and the
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other is not or if they are both initialized and refer to the different
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volumes.
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\param volume The volume to be tested for inequality.
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\return \c true, if the objects and unequal, \c false otherwise.
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*/
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/*!
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\fn BVolume& BVolume::operator=(const BVolume &volume)
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\brief Assigns the supplied BVolume object to this volume, this object is
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made to be an exact clone of the supplied one.
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\param volume The volume to be assigned.
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\return A reference to this object.
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*/
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//! @}
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