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haiku/docs/user/storage/AppFileInfo.dox
Ingo Weinhold c41356fab5 BAppFileInfo: Add method versions that don't touch the MIME DB 
Add SetSupportedTypes() and SetIcon[ForType]() versions with an
additional bool updateMimeDB parameter. If false, the method doesn't
update the MIME DB entries for the type.
2014-01-26 13:43:04 +01:00

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/*
* Copyright 2011 Haiku, Inc. All rights reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* John Scipione, jscipione@gmail.com
* Ingo Weinhold, bonefish@users.sf.net
*
* Corresponds to:
* headers/os/storage/AppFileInfo.h rev 42274
* src/kits/storage/AppFileInfo.cpp rev 42274
*/
/*!
\file AppFileInfo.h
\ingroup storage
\ingroup libbe
\brief Provides the BAppFileInfo class.
*/
/*!
\class BAppFileInfo
\ingroup storage
\ingroup libbe
\brief Provides access to the metadata associated with executables,
libraries and add-ons.
The BAppFileInfo class allows for information about an executable or
add-on to be accessed or set. Information about an executable that can be
accessed include the signature, catalog entry, supported MIME types,
application flags, icon(s), and version info.
You should initialize the BAppFileInfo with a BFile object that represents
the executable or add-on that you want to access. If you only want to read
metadata from the file you do not have to open it for reading. However, if
you also want to write metadata then you should open the BFile for writing.
To associate a BFile with a BAppFileInfo object you can either pass the
BFile object into the constructor or you can use the empty constructor and
then use the SetTo() method to set the BFile to the BAppFileInfo object.
When accessing information from a BFileInfo object it will first look in the
attributes of the BFile. If the information is not found then the BFileInfo
object will next look at the resource of the BFile. You can tell the
BFileInfo object to look only in the attributes or resources with the
SetInfoLocation() method.
*/
/*!
\fn BAppFileInfo::BAppFileInfo()
\brief Creates an uninitialized BAppFileInfo object.
*/
/*!
\fn BAppFileInfo::BAppFileInfo(BFile* file)
\brief Creates an BAppFileInfo object and initializes it to the supplied
file.
The caller retains ownership of the supplied BFile object. It must not
be deleted during the life time of the BAppFileInfo. It is not deleted
when the BAppFileInfo is destroyed.
\param file The BFile object that the BAppFileInfo object shall be
initialized to.
*/
/*!
\fn BAppFileInfo::~BAppFileInfo()
\brief Frees all resources associated with this object.
The supplied BFile object is not deleted if one is specified.
*/
/*!
\fn status_t BAppFileInfo::SetTo(BFile *file)
\brief Initializes the BAppFileInfo to the supplied file.
The caller retains ownership of the supplied BFile object. It must not
be deleted during the life time of the BAppFileInfo. The BFile object
is not deleted when the BAppFileInfo is destroyed.
\param file The BFile object that the BAppFileInfo object shall be
initialized to.
\returns an status code.
\retval B_OK Everything went fine.
\retval B_BAD_VALUE \c NULL \a file or \a file is not properly initialized.
*/
/*!
\name MIME Type
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetType(char *type) const
\brief Gets the MIME type of the associated file.
\param type A pointer to a pre-allocated character buffer of size
\c B_MIME_TYPE_LENGTH or larger into which the MIME type of the
file will be written.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a type or the type string stored in the
attribute/resources is longer than \c B_MIME_TYPE_LENGTH.
\retval B_BAD_TYPE The attribute/resources the type string is stored in
has the wrong type.
\retval B_ENTRY_NOT_FOUND No type is set on the file.
*/
/*!
\fn status_t BAppFileInfo::SetType(const char* type)
\brief Sets the MIME type of the associated file.
If \a type is \c NULL if the file's MIME type is unset.
\param type The MIME type to be assigned to the file. It must not be
longer than \c B_MIME_TYPE_LENGTH (including the terminating null).
The MIME type may be \c NULL.
\returns a status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \a type is longer than \c B_MIME_TYPE_LENGTH.
*/
//! @}
/*!
\name Signature
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetSignature(char* signature) const
\brief Gets the application signature of the associated file.
\param signature A pointer to a pre-allocated character buffer of size
\c B_MIME_TYPE_LENGTH or larger into which the application
signature of the file will be written.
\returns a status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a signature or the signature stored in the
attribute/resources is longer than \c B_MIME_TYPE_LENGTH.
\retval B_BAD_TYPE The attribute/resources the signature is stored in have
the wrong type.
\retval B_ENTRY_NOT_FOUND No signature is set on the file.
*/
/*!
\fn status_t BAppFileInfo::SetSignature(const char* signature)
\brief Sets the application signature of the associated file.
If \a signature is \c NULL the file's application signature is unset.
\param signature The application signature to be assigned to the file.
Must not be longer than \c B_MIME_TYPE_LENGTH (including the
terminating \c NUL). The \a signature may be \c NULL.
\returns a status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \a signature is longer than \c B_MIME_TYPE_LENGTH.
*/
//! @}
/*!
\name Catalog Entry
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetCatalogEntry(char *catalogEntry) const
\brief Gets the catalog entry of the associated file used for localization.
\param catalogEntry A pointer to a pre-allocated character buffer of size
\c B_MIME_TYPE_LENGTH * 3 or larger into which the catalog entry
of the file will be written.
\returns a status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a catalogEntry or the entry stored in the
attribute/resources is longer than \c B_MIME_TYPE_LENGTH * 3.
\retval B_BAD_TYPE The attribute/resources the entry is stored in have
the wrong type.
\retval B_ENTRY_NOT_FOUND No catalog entry is set on the file.
*/
/*!
\fn status_t BAppFileInfo::SetCatalogEntry(const char* catalogEntry)
\brief Sets the catalog entry of the associated file used for localization.
If \a catalogEntry is \c NULL the file's catalog entry is unset.
\param catalogEntry The catalog entry to be assigned to the file.
Of the form "x-vnd.Haiku-app:context:name". Must not be longer than
\c B_MIME_TYPE_LENGTH * 3 (including the terminating \c NUL).
The \a catalogEntry may be \c NULL.
\returns a status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \a catalogEntry is longer than
\c B_MIME_TYPE_LENGTH * 3.
*/
//! @}
/*!
\name Application Flags
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetAppFlags(uint32* flags) const
\brief Gets the application \a flags of the associated file.
\param flags A pointer to a pre-allocated \c uint32 into which the
application flags of the file are written.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a flags.
\retval B_BAD_TYPE The attribute/resources the flags are stored in have
the wrong type.
\retval B_ENTRY_NOT_FOUND No application flags are set on the file.
*/
/*!
\fn status_t BAppFileInfo::SetAppFlags(uint32 flags)
\brief Sets the application \a flags of the associated file.
\param flags The application \a flags to be assigned to the file.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object was not properly initialized.
*/
/*!
\fn status_t BAppFileInfo::RemoveAppFlags()
\brief Removes the application flags from the associated file.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object was not properly initialized.
*/
//! @}
/*!
\name Supported MIME Types
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetSupportedTypes(BMessage* types) const
\brief Gets the MIME types supported by the application.
The supported MIME types are added to a field "types" of type
\c B_STRING_TYPE in \a types.
\param types A pointer to a pre-allocated BMessage into which the
MIME types supported by the application will be written.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a types.
\retval B_BAD_TYPE The attribute/resources that the supported types
are stored in have the wrong type.
\retval B_ENTRY_NOT_FOUND No supported types are set on the file.
*/
/*!
\fn status_t BAppFileInfo::SetSupportedTypes(const BMessage* types,
bool updateMimeDB, bool syncAll)
\brief Sets the MIME types that are supported by the application and allows
you to specify whether or not the supported types in the MIME DB shall
be updated as well.
If \a types is \c NULL then the application's supported types are unset.
The supported MIME types must be stored in a field "types" of type
\c B_STRING_TYPE in \a types.
If \a updateMimeDB is \c true, the method will inform the registrar about
this news. In this case for each supported type the result of
BMimeType::GetSupportingApps() will afterward include the signature of this
application. That is, the application file needs to have a signature set.
\a syncAll specifies whether the no longer supported types shall be
updated as well, i.e. whether or not this application shall be removed
from the list of supporting applications. Only relevant when \a updateMimeDB
is \c true.
\param types The supported types to be assigned to the file.
May be \c NULL.
\param updateMimeDB \c true to update the supported types in the MIME DB,
\c false otherwise.
\param syncAll \c true to also synchronize the no-longer supported
types, \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
*/
/*!
\fn status_t BAppFileInfo::SetSupportedTypes(const BMessage* types,
bool syncAll)
\brief Sets the MIME types that are supported by the application and allows
you to specify whether or not the no longer supported types shall be
updated as well.
If \a types is \c NULL then the application's supported types are unset.
The supported MIME types must be stored in a field "types" of type
\c B_STRING_TYPE in \a types.
The method informs the registrar about this news.
For each supported type the result of BMimeType::GetSupportingApps()
will afterwards include the signature of this application. That is,
the application file needs to have a signature set.
\a syncAll specifies whether the no longer supported types shall be
updated as well, i.e. whether or not this application shall be removed
from the list of supporting applications.
\param types The supported types to be assigned to the file.
May be \c NULL.
\param syncAll \c true to also synchronize the no-longer supported
types, \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
*/
/*!
\fn status_t BAppFileInfo::SetSupportedTypes(const BMessage* types)
\brief Sets the MIME types supported by the application.
This method is a short-hand for SetSupportedTypes(types, false).
\see SetSupportedType(const BMessage*, bool) for detailed information.
\param types The supported types to be assigned to the file.
May be \c NULL.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
*/
/*!
\fn bool BAppFileInfo::IsSupportedType(const char* type) const
\brief Returns whether the application supports the supplied MIME type.
If the application supports the wildcard type "application/octet-stream"
then this method returns \c true for any MIME type.
\param type The MIME type in question.
\returns \c true if \a type is a valid MIME type and it is supported by
the application, \c false otherwise.
*/
/*!
\fn bool BAppFileInfo::Supports(BMimeType* type) const
\brief Returns whether the application supports the supplied MIME type
explicitly.
Unlike IsSupportedType(), this method returns \c true, only if the type
is explicitly supported, regardless of whether it supports
"application/octet-stream".
\param type The MIME type in question.
\returns \c true if \a type is a valid MIME type and it is explicitly
supported by the application, \c false otherwise.
*/
//! @}
/*!
\name Application Icon
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetIcon(BBitmap* icon, icon_size which) const
\brief Gets the icon of the associated file and puts it into a pre-allocated
BBitmap.
\param icon A pointer to a pre-allocated BBitmap of the correct dimension
to store the requested icon (16x16 for the \c B_MINI_ICON and 32x32
for the \c B_LARGE_ICON).
\param which Specifies the size of the icon to be retrieved:
\c B_MINI_ICON for the mini and \c B_LARGE_ICON for the large icon.
For HVIF icons this parameter has no effect.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a icon, unsupported icon size \a which or
bitmap dimensions (\a icon) and icon size (\a which) do not match.
*/
/*!
\fn status_t BAppFileInfo::GetIcon(uint8** data, size_t* size) const
\brief Gets the icon of the associated file and puts it into a buffer.
\param data The pointer in which the flat icon data will be returned.
\param size The pointer in which the size of the data found will be
returned.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a data or \c NULL size.
*/
/*!
\fn status_t BAppFileInfo::SetIcon(const BBitmap* icon, icon_size which,
bool updateMimeDB)
\brief Sets the icon of the associated file from a BBitmap.
If \a icon is \c NULL then the icon of the file is unset.
\param icon A pointer to the BBitmap containing the icon to be set.
May be \c NULL to specify no icon.
\param which Specifies the size of the icon to be set: \c B_MINI_ICON for
16x16 mini icon and \c B_LARGE_ICON for the 32x32 large icon.
For HVIF icons this parameter has no effect.
\param updateMimeDB \c true to also set the icon for the application in the
MIME DB. \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE Unknown icon size \a which or bitmap dimensions
(\a icon) and icon size (\a which) do not match.
*/
/*!
\fn status_t BAppFileInfo::SetIcon(const BBitmap* icon, icon_size which)
\brief Sets the icon of the associated file from a BBitmap.
If \a icon is \c NULL then the icon of the file is unset.
Also sets the application's icon in the MIME DB, if the file has a valid
application signature.
\param icon A pointer to the BBitmap containing the icon to be set.
May be \c NULL to specify no icon.
\param which Specifies the size of the icon to be set: \c B_MINI_ICON for
16x16 mini icon and \c B_LARGE_ICON for the 32x32 large icon.
For HVIF icons this parameter has no effect.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE Unknown icon size \a which or bitmap dimensions
(\a icon) and icon size (\a which) do not match.
*/
/*!
\fn status_t BAppFileInfo::SetIcon(const uint8* data, size_t size,
bool updateMimeDB)
\brief Sets the icon of the associated file from a buffer.
If \a data is \c NULL then the icon of the file is unset.
\param data A pointer to the data buffer containing the vector icon
to be set. May be \c NULL.
\param size Specifies the size of buffer pointed to by \a data.
\param updateMimeDB \c true to also set the icon for the application in the
MIME DB. \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL data.
*/
/*!
\fn status_t BAppFileInfo::SetIcon(const uint8* data, size_t size)
\brief Sets the icon of the associated file from a buffer.
If \a data is \c NULL then the icon of the file is unset.
Also sets the application's icon in the MIME DB, if the file has a valid
application signature.
\param data A pointer to the data buffer containing the vector icon
to be set. May be \c NULL.
\param size Specifies the size of buffer pointed to by \a data.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL data.
*/
/*!
\fn status_t BAppFileInfo::GetIconForType(const char* type, BBitmap* icon,
icon_size size) const
\brief Gets the icon the application provides for a given MIME type and
puts it into a BBitmap.
\note If \a type is \c NULL, the application's icon is retrieved.
\param type The MIME type in question. May be \c NULL.
\param icon A pointer to a pre-allocated BBitmap of the correct dimension
to store the requested icon (16x16 for the mini and 32x32 for the
large icon).
\param size Specifies the size of the icon to be retrieved:
\c B_MINI_ICON for the mini and \c B_LARGE_ICON for the large icon.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a icon, unsupported icon size
\a which or bitmap dimensions (\a icon) and icon size (\a which) do
not match.
*/
/*!
\fn status_t BAppFileInfo::GetIconForType(const char* type, uint8** data,
size_t* size) const
\brief Gets the icon the application provides for a given MIME type and
puts it into a buffer.
\note If \a type is set to \c NULL the the application's icon is retrieved.
\param type The MIME type in question. May be \c NULL.
\param data A pointer in which the icon data will be returned. When you
are done with the data, you should use free() to deallocate it.
\param size A pointer in which the size of the retrieved data is returned.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a data and/or \a size. Or the supplied
\a type is not a valid MIME type.
*/
/*!
\fn status_t BAppFileInfo::SetIconForType(const char* type,
const BBitmap* icon, icon_size which, bool updateMimeDB)
\brief Sets the icon the application provides for a given MIME type from a
BBitmap.
\note If \a type is \c NULL then the icon is set.
\note If \a icon is \c NULL then the icon is unset.
If \a updateMimeDB is \c true and if the file has a signature, then the icon
is also set on the MIME type. If the type for the signature has not been
installed yet, it is installed before.
\param type The MIME type in question. May be \c NULL.
\param icon A pointer to the BBitmap containing the icon to be set.
May be \c NULL.
\param which Specifies the size of the icon to be set: \c B_MINI_ICON
for the mini and \c B_LARGE_ICON for the large icon.
\param updateMimeDB \c true to also set the icon for the type in the MIME
DB. \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE Either the icon size \a which is unknown,
the bitmap dimensions (\a icon) and icon size (\a which) do not
match, or the provided \a type is not a valid MIME type.
*/
/*!
\fn status_t BAppFileInfo::SetIconForType(const char* type,
const BBitmap* icon, icon_size which)
\brief Sets the icon the application provides for a given MIME type from a
BBitmap.
\note If \a type is \c NULL then the icon is set.
\note If \a icon is \c NULL then the icon is unset.
If the file has a signature, then the icon is also set on the MIME type.
If the type for the signature has not been installed yet, it is installed
before.
\param type The MIME type in question. May be \c NULL.
\param icon A pointer to the BBitmap containing the icon to be set.
May be \c NULL.
\param which Specifies the size of the icon to be set: \c B_MINI_ICON
for the mini and \c B_LARGE_ICON for the large icon.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE Either the icon size \a which is unknown,
the bitmap dimensions (\a icon) and icon size (\a which) do not
match, or the provided \a type is not a valid MIME type.
*/
/*!
\fn status_t BAppFileInfo::SetIconForType(const char* type,
const uint8* data, size_t size, bool updateMimeDB)
\brief Sets the icon the application provides for a given MIME type from a
buffer.
\note If \a type is \c NULL then the icon is set.
\note If \a data is \c NULL then the icon is unset.
If \a updateMimeDB is \c true and if the file has a signature, then the icon
is also set on the MIME type. If the type for the signature has not been
installed yet, it is installed before.
\param type The MIME type in question. May be \c NULL.
\param data A pointer to the data containing the icon to be set.
May be \c NULL.
\param size Specifies the size of buffer provided in \a data.
\param updateMimeDB \c true to also set the icon for the type in the MIME
DB. \c false otherwise.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE The provided \a type is not a valid MIME type.
*/
/*!
\fn status_t BAppFileInfo::SetIconForType(const char* type,
const uint8* data, size_t size)
\brief Sets the icon the application provides for a given MIME type from a
buffer.
\note If \a type is \c NULL then the icon is set.
\note If \a data is \c NULL then the icon is unset.
If the file has a signature, then the icon is also set on the MIME type.
If the type for the signature has not been installed yet, it is
installed before.
\param type The MIME type in question. May be \c NULL.
\param data A pointer to the data containing the icon to be set.
May be \c NULL.
\param size Specifies the size of buffer provided in \a data.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE The provided \a type is not a valid MIME type.
*/
//! @}
/*!
\name Version Info
*/
//! @{
/*!
\fn status_t BAppFileInfo::GetVersionInfo(version_info* info,
version_kind kind) const
\brief Gets the version info of the associated file.
\param info A pointer to a pre-allocated version_info structure into
which the version info should be written.
\param kind Specifies the kind of the version info to be retrieved:
- \c B_APP_VERSION_KIND for the application's version info and
- \c B_SYSTEM_VERSION_KIND for the suite's info the application
belongs to.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
\retval B_BAD_VALUE \c NULL \a info.
*/
/*!
\fn status_t BAppFileInfo::SetVersionInfo(const version_info* info,
version_kind kind)
\brief Sets the version info of the associated file.
\note If \a info is set to \c NULL then the file's version info is unset.
\param info The version info to be set. May be \c NULL.
\param kind Specifies kind of version info to be set:
- \c B_APP_VERSION_KIND for the application's version info and
- \c B_SYSTEM_VERSION_KIND for the suite's info the application
belongs to.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT The object is not properly initialized.
*/
//! @}
/*!
\name Attributes/Resources
*/
//! @{
/*!
\fn void BAppFileInfo::SetInfoLocation(info_location location)
\brief Specifies the location where the metadata shall be stored.
The options for \a location are:
- \c B_USE_ATTRIBUTES: Store the data in the attributes.
- \c B_USE_RESOURCES: Store the data in the resources.
- \c B_USE_BOTH_LOCATIONS: Store the data in attributes and resources.
\param location The location where the metadata shall be stored.
*/
/*!
\fn bool BAppFileInfo::IsUsingAttributes() const
\brief Returns whether the object (also) stores the metadata in the
attributes of the associated file.
\returns \c true if the metadata are (also) stored in the file's
attributes, \c false otherwise.
*/
/*!
\fn bool BAppFileInfo::IsUsingResources() const
\brief Returns whether the object (also) stores the metadata in the
resources of the associated file.
\returns \c true if the metadata are (also) stored in the file's
resources, \c false otherwise.
*/
//! @}
/*!
\fn BAppFileInfo & BAppFileInfo::operator=(const BAppFileInfo &)
\brief Privatized assignment operator to prevent usage.
*/
/*!
\fn BAppFileInfo::BAppFileInfo(const BAppFileInfo &)
\brief Privatized copy constructor to prevent usage.
*/
/*!
\fn status_t BAppFileInfo::GetMetaMime(BMimeType* meta) const
\brief Initializes a BMimeType to the signature of the associated file.
\warning The parameter \a meta is not checked.
\param meta A pointer to a pre-allocated BMimeType that shall be
initialized to the signature of the associated file.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_BAD_VALUE \c NULL \a meta
\retval B_ENTRY_NOT_FOUND The file has not signature or the signature is
(not installed in the MIME database.) no valid MIME string.
*/
/*!
\fn status_t BAppFileInfo::_ReadData(const char* name, int32 id,
type_code type, void* buffer, size_t bufferSize,
size_t &bytesRead, void** allocatedBuffer) const
\brief Reads data from an attribute or resource.
\note The data is read from the location specified by \a fWhere.
\warning The object must be properly initialized. The parameters are
\b NOT checked.
\param name The name of the attribute/resource to be read.
\param id The resource ID of the resource to be read. It is ignored
when < 0.
\param type The type of the attribute/resource to be read.
\param buffer A pre-allocated buffer for the data to be read.
\param bufferSize The size of the supplied buffer.
\param bytesRead A reference parameter, set to the number of bytes
actually read.
\param allocatedBuffer If not \c NULL, the method allocates a buffer
large enough too store the whole data and writes a pointer to it
into this variable. If \c NULL, the supplied buffer is used.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_ENTRY_NOT_FOUND The entry was not found.
\retval B_NO_MEMORY Ran out of memory allocating the buffer.
\retval B_BAD_VALUE \a type did not match.
*/
/*!
\fn status_t BAppFileInfo::_WriteData(const char* name, int32 id,
type_code type, const void* buffer, size_t bufferSize, bool findID)
\brief Writes data to an attribute or resource.
\note The data is written to the location(s) specified by \a fWhere.
\warning The object must be properly initialized. The parameters are
\b NOT checked.
\param name The name of the attribute/resource to be written.
\param id The resource ID of the resource to be written.
\param type The type of the attribute/resource to be written.
\param buffer A buffer containing the data to be written.
\param bufferSize The size of the supplied buffer.
\param findID If set to \c true use the ID that is already assigned to the
\a name / \a type pair or take the first unused ID >= \a id.
If \c false, \a id is used.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_ERROR An error occurred while trying to write the data.
*/
/*!
\fn status_t BAppFileInfo::_RemoveData(const char* name, type_code type)
\brief Removes an attribute or resource.
\note The removal location is specified by \a fWhere.
\warning The object must be properly initialized. The parameters are
\b NOT checked.
\param name The name of the attribute/resource to be remove.
\param type The type of the attribute/resource to be removed.
\returns A status code.
\retval B_OK Everything went fine.
\retval B_NO_INIT Not using attributes and not using resources.
\retval B_ENTRY_NOT_FOUND The attribute or resource was not found.
*/
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