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Diffstat (limited to 'include/iprt/vfs.h')
| -rw-r--r-- | include/iprt/vfs.h | 934 |
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diff --git a/include/iprt/vfs.h b/include/iprt/vfs.h new file mode 100644 index 00000000..6eefa01d --- /dev/null +++ b/include/iprt/vfs.h @@ -0,0 +1,934 @@ +/** @file + * IPRT - Virtual Filesystem. + */ + +/* + * Copyright (C) 2010 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef ___iprt_vfs_h +#define ___iprt_vfs_h + +#include <iprt/cdefs.h> +#include <iprt/types.h> +#include <iprt/dir.h> +#include <iprt/fs.h> +#include <iprt/handle.h> +#include <iprt/symlink.h> +#include <iprt/sg.h> +#include <iprt/time.h> + + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_vfs RTVfs - Virtual Filesystem + * @ingroup grp_rt + * + * The virtual filesystem APIs are intended to make it possible to work on + * container files, file system sub-trees, file system overlays and other custom + * filesystem configurations. It also makes it possible to create filters, like + * automatically gunzipping a tar.gz file before feeding it to the RTTar API for + * unpacking - or wise versa. + * + * The virtual filesystem APIs are intended to mirror the RTDir, RTFile, RTPath + * and RTFs APIs pretty closely so that rewriting a piece of code to work with + * it should be easy. However there are some differences to the way the APIs + * works and the user should heed the documentation. The differences are + * usually motivated by simplification and in some case to make the VFS more + * flexible. + * + * @{ + */ + +/** + * The object type. + */ +typedef enum RTVFSOBJTYPE +{ + /** Invalid type. */ + RTVFSOBJTYPE_INVALID = 0, + /** Pure base object. + * This is returned by the filesystem stream to represent directories, + * devices, fifos and similar that needs to be created. */ + RTVFSOBJTYPE_BASE, + /** Virtual filesystem. */ + RTVFSOBJTYPE_VFS, + /** Filesystem stream. */ + RTVFSOBJTYPE_FS_STREAM, + /** Pure I/O stream. */ + RTVFSOBJTYPE_IO_STREAM, + /** Directory. */ + RTVFSOBJTYPE_DIR, + /** File. */ + RTVFSOBJTYPE_FILE, + /** Symbolic link. */ + RTVFSOBJTYPE_SYMLINK, + /** End of valid object types. */ + RTVFSOBJTYPE_END, + /** Pure I/O stream. */ + RTVFSOBJTYPE_32BIT_HACK = 0x7fffffff +} RTVFSOBJTYPE; +/** Pointer to a VFS object type. */ +typedef RTVFSOBJTYPE *PRTVFSOBJTYPE; + + + +/** @name RTVfsCreate flags + * @{ */ +/** Whether the file system is read-only. */ +#define RTVFS_C_READONLY RT_BIT(0) +/** Whether we the VFS should be thread safe (i.e. automaticaly employ + * locks). */ +#define RTVFS_C_THREAD_SAFE RT_BIT(1) +/** @} */ + +/** + * Creates an empty virtual filesystem. + * + * @returns IPRT status code. + * @param pszName Name, for logging and such. + * @param fFlags Flags, MBZ. + * @param phVfs Where to return the VFS handle. Release the returned + * reference by calling RTVfsRelease. + */ +RTDECL(int) RTVfsCreate(const char *pszName, uint32_t fFlags, PRTVFS phVfs); +RTDECL(uint32_t) RTVfsRetain(RTVFS phVfs); +RTDECL(uint32_t) RTVfsRelease(RTVFS phVfs); +RTDECL(int) RTVfsAttach(RTVFS hVfs, const char *pszMountPoint, uint32_t fFlags, RTVFS hVfsAttach); +RTDECL(int) RTVfsDetach(RTVFS hVfs, const char *pszMountPoint, RTVFS hVfsToDetach, PRTVFS *phVfsDetached); +RTDECL(uint32_t) RTVfsGetAttachmentCount(RTVFS hVfs); +RTDECL(int) RTVfsGetAttachment(RTVFS hVfs, uint32_t iOrdinal, PRTVFS *phVfsAttached, uint32_t *pfFlags, + char *pszMountPoint, size_t cbMountPoint); + +/** + * Checks whether a given range is in use by the virtual filesystem. + * + * @returns IPRT status code. + * @param hVfs VFS handle. + * @param off Start offset to check. + * @param cb Number of bytes to check. + * @param pfUsed Where to store the result. + */ +RTDECL(int) RTVfsIsRangeInUse(RTVFS hVfs, uint64_t off, size_t cb, + bool *pfUsed); + +/** @defgroup grp_vfs_dir VFS Base Object API + * @{ + */ + +/** + * Retains a reference to the VFS base object handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(uint32_t) RTVfsObjRetain(RTVFSOBJ hVfsObj); + +/** + * Releases a reference to the VFS base handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(uint32_t) RTVfsObjRelease(RTVFSOBJ hVfsObj); + +/** + * Query information about the object. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if the @a enmAddAttr value is not handled by the + * implementation. + * + * @param hVfsObj The VFS object handle. + * @param pObjInfo Where to return the info. + * @param enmAddAttr Which additional attributes should be retrieved. + * @sa RTVfsIoStrmQueryInfo, RTVfsFileQueryInfo, RTFileQueryInfo, + * RTPathQueryInfo + */ +RTDECL(int) RTVfsObjQueryInfo(RTVFSOBJ hVfsObj, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); + + +/** + * Converts a VFS base object handle to a VFS handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFS) RTVfsObjToVfs(RTVFSOBJ hVfsObj); + +/** + * Converts a VFS base object handle to a VFS filesystem stream handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFSFSSTREAM) RTVfsObjToFsStream(RTVFSOBJ hVfsObj); + +/** + * Converts a VFS base object handle to a VFS directory handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFSDIR) RTVfsObjToDir(RTVFSOBJ hVfsObj); + +/** + * Converts a VFS base object handle to a VFS I/O stream handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFSIOSTREAM) RTVfsObjToIoStream(RTVFSOBJ hVfsObj); + +/** + * Converts a VFS base object handle to a VFS file handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFSFILE) RTVfsObjToFile(RTVFSOBJ hVfsObj); + +/** + * Converts a VFS base object handle to a VFS symbolic link handle. + * + * @returns Referenced handle on success, NIL on failure. + * @param hVfsObj The VFS base object handle. + */ +RTDECL(RTVFSSYMLINK) RTVfsObjToSymlink(RTVFSOBJ hVfsObj); + + +/** + * Converts a VFS handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfs The VFS handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromVfs(RTVFS hVfs); + +/** + * Converts a VFS filesystem stream handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfsFSs The VFS filesystem stream handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromFsStream(RTVFSFSSTREAM hVfsFss); + +/** + * Converts a VFS directory handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfsDir The VFS directory handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromDir(RTVFSDIR hVfsDir); + +/** + * Converts a VFS I/O stream handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfsIos The VFS I/O stream handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromIoStream(RTVFSIOSTREAM hVfsIos); + +/** + * Converts a VFS file handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfsFile The VFS file handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromFile(RTVFSFILE hVfsFile); + +/** + * Converts a VFS symbolic link handle to a VFS base object handle. + * + * @returns Referenced handle on success, NIL if the input handle was invalid. + * @param hVfsSym The VFS symbolic link handle. + */ +RTDECL(RTVFSOBJ) RTVfsObjFromSymlink(RTVFSSYMLINK hVfsSym); + +/** @} */ + + +/** @defgroup grp_vfs_fsstream VFS Filesystem Stream API + * + * Filesystem streams are for tar, cpio and similar. Any virtual filesystem can + * be turned into a filesystem stream using RTVfsFsStrmFromVfs. + * + * @{ + */ + +RTDECL(uint32_t) RTVfsFsStrmRetain(RTVFSFSSTREAM hVfsFss); +RTDECL(uint32_t) RTVfsFsStrmRelease(RTVFSFSSTREAM hVfsFss); +RTDECL(int) RTVfsFsStrmQueryInfo(RTVFSFSSTREAM hVfsFss, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); + +/** + * Gets the next object in the stream. + * + * This call may affect the stream posision of a previously returned object. + * + * The type of object returned here typically boils down to three types: + * - I/O streams (representing files), + * - symbolic links + * - base object + * The base objects represent anything not convered by the two other, i.e. + * directories, device nodes, fifos, sockets and whatnot. The details can be + * queried using RTVfsObjQueryInfo. + * + * That said, absolutely any object except for filesystem stream objects can be + * returned by this call. Any generic code is adviced to just deal with it all. + * + * @returns IPRT status code. + * @retval VINF_SUCCESS if a new object was retrieved. + * @retval VERR_EOF when there are no more objects. + * + * @param pvThis The implementation specific directory data. + * @param ppszName Where to return the object name. Must be freed by + * calling RTStrFree. + * @param penmType Where to return the object type. + * @param hVfsObj Where to return the object handle (referenced). + * This must be cast to the desired type before use. + */ +RTDECL(int) RTVfsFsStrmNext(RTVFSFSSTREAM hVfsFss, char **ppszName, RTVFSOBJTYPE *penmType, PRTVFSOBJ phVfsObj); + +/** @} */ + + +/** @defgroup grp_vfs_dir VFS Directory API + * @{ + */ + +/** + * Retains a reference to the VFS directory handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVfsDir The VFS directory handle. + */ +RTDECL(uint32_t) RTVfsDirRetain(RTVFSDIR hVfsDir); + +/** + * Releases a reference to the VFS directory handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVfsIos The VFS directory handle. + */ +RTDECL(uint32_t) RTVfsDirRelease(RTVFSDIR hVfsDir); + +/** @} */ + + +/** @defgroup grp_vfs_iostream VFS Symbolic Link API + * + * @remarks The TAR VFS and filesystem stream uses symbolic links for + * describing hard links as well. The users must use RTFS_IS_SYMLINK + * to check if it is a real symlink in those cases. + * + * @remarks Any VFS which is backed by a real file system may be subject to + * races with other processes or threads, so the user may get + * unexpected errors when this happends. This is a bit host specific, + * i.e. it might be prevent on windows if we care. + * + * @{ + */ + + +/** + * Retains a reference to the VFS symbolic link handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVfsSym The VFS symbolic link handle. + */ +RTDECL(uint32_t) RTVfsSymlinkRetain(RTVFSSYMLINK hVfsSym); + +/** + * Releases a reference to the VFS symbolic link handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVfsSym The VFS symbolic link handle. + */ +RTDECL(uint32_t) RTVfsSymlinkRelease(RTVFSSYMLINK hVfsSym); + +/** + * Query information about the symbolic link. + * + * @returns IPRT status code. + * @param hVfsSym The VFS symbolic link handle. + * @param pObjInfo Where to return the info. + * @param enmAddAttr Which additional attributes should be retrieved. + * + * @sa RTFileQueryInfo, RTPathQueryInfo, RTPathQueryInfoEx + */ +RTDECL(int) RTVfsSymlinkQueryInfo(RTVFSSYMLINK hVfsSym, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); + +/** + * Set the unix style owner and group. + * + * @returns IPRT status code. + * @param hVfsSym The VFS symbolic link handle. + * @param fMode The new mode bits. + * @param fMask The mask indicating which bits we are changing. + * @sa RTFileSetMode, RTPathSetMode + */ +RTDECL(int) RTVfsSymlinkSetMode(RTVFSSYMLINK hVfsSym, RTFMODE fMode, RTFMODE fMask); + +/** + * Set the timestamps associated with the object. + * + * @returns IPRT status code. + * @param hVfsSym The VFS symbolic link handle. + * @param pAccessTime Pointer to the new access time. NULL if not + * to be changed. + * @param pModificationTime Pointer to the new modifcation time. NULL if + * not to be changed. + * @param pChangeTime Pointer to the new change time. NULL if not to be + * changed. + * @param pBirthTime Pointer to the new time of birth. NULL if not to be + * changed. + * @remarks See RTFileSetTimes for restrictions and behavior imposed by the + * host OS or underlying VFS provider. + * @sa RTFileSetTimes, RTPathSetTimes + */ +RTDECL(int) RTVfsSymlinkSetTimes(RTVFSSYMLINK hVfsSym, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime, + PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime); + +/** + * Set the unix style owner and group. + * + * @returns IPRT status code. + * @param hVfsSym The VFS symbolic link handle. + * @param uid The user ID of the new owner. NIL_RTUID if + * unchanged. + * @param gid The group ID of the new owner group. NIL_RTGID if + * unchanged. + * @sa RTFileSetOwner, RTPathSetOwner. + */ +RTDECL(int) RTVfsSymlinkSetOwner(RTVFSSYMLINK hVfsSym, RTUID uid, RTGID gid); + +/** + * Read the symbolic link target. + * + * @returns IPRT status code. + * @param hVfsSym The VFS symbolic link handle. + * @param pszTarget The target buffer. + * @param cbTarget The size of the target buffer. + * @sa RTSymlinkRead + */ +RTDECL(int) RTVfsSymlinkRead(RTVFSSYMLINK hVfsSym, char *pszTarget, size_t cbTarget); + +/** @} */ + + + +/** @defgroup grp_vfs_iostream VFS I/O Stream API + * @{ + */ + +/** + * Create a VFS I/O stream handle from a standard IPRT file handle (RTFILE). + * + * @returns IPRT status code. + * @param hFile The standard IPRT file handle. + * @param fOpen The flags the handle was opened with. Pass 0 to + * have these detected. + * @param fLeaveOpen Whether to leave the handle open when the VFS file + * is released, or to close it (@c false). + * @param phVfsIos Where to return the VFS I/O stream handle. + */ +RTDECL(int) RTVfsIoStrmFromRTFile(RTFILE hFile, uint64_t fOpen, bool fLeaveOpen, PRTVFSIOSTREAM phVfsIos); + +/** + * Create a VFS I/O stream handle from one of the standard handles. + * + * @returns IPRT status code. + * @param enmStdHandle The standard IPRT file handle. + * @param fOpen The flags the handle was opened with. Pass 0 to + * have these detected. + * @param fLeaveOpen Whether to leave the handle open when the VFS file + * is released, or to close it (@c false). + * @param phVfsIos Where to return the VFS I/O stream handle. + */ +RTDECL(int) RTVfsIoStrmFromStdHandle(RTHANDLESTD enmStdHandle, uint64_t fOpen, bool fLeaveOpen, + PRTVFSIOSTREAM phVfsIos); + +/** + * Retains a reference to the VFS I/O stream handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVfsIos The VFS I/O stream handle. + */ +RTDECL(uint32_t) RTVfsIoStrmRetain(RTVFSIOSTREAM hVfsIos); + +/** + * Releases a reference to the VFS I/O stream handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVfsIos The VFS I/O stream handle. + */ +RTDECL(uint32_t) RTVfsIoStrmRelease(RTVFSIOSTREAM hVfsIos); + +/** + * Convert the VFS I/O stream handle to a VFS file handle. + * + * @returns The VFS file handle on success, this must be released. + * NIL_RTVFSFILE if the I/O stream handle is invalid. + * @param hVfsIos The VFS I/O stream handle. + * @sa RTVfsFileToIoStream + */ +RTDECL(RTVFSFILE) RTVfsIoStrmToFile(RTVFSIOSTREAM hVfsIos); + +/** + * Query information about the I/O stream. + * + * @returns IPRT status code. + * @param hVfsIos The VFS I/O stream handle. + * @param pObjInfo Where to return the info. + * @param enmAddAttr Which additional attributes should be retrieved. + * @sa RTFileQueryInfo + */ +RTDECL(int) RTVfsIoStrmQueryInfo(RTVFSIOSTREAM hVfsIos, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); + +/** + * Read bytes from the I/O stream. + * + * @returns IPRT status code. + * @retval VINF_SUCCESS and the number of bytes read written to @a pcbRead. + * @retval VINF_TRY_AGAIN if @a fBlocking is @c false, @a pcbRead is not NULL, + * and no data was available. @a *pcbRead will be set to 0. + * @retval VINF_EOF when trying to read __beyond__ the end of the stream and + * @a pcbRead is not NULL (it will be set to the number of bytes read, + * or 0 if the end of the stream was reached before this call). + * When the last byte of the read request is the last byte in the + * stream, this status code will not be used. However, VINF_EOF is + * returned when attempting to read 0 bytes while standing at the end + * of the stream. + * @retval VERR_EOF when trying to read __beyond__ the end of the stream and + * @a pcbRead is NULL. + * @retval VERR_ACCESS_DENIED if the stream is not readable. + * + * @param hVfsIos The VFS I/O stream handle. + * @param pvBuf Where to store the read bytes. + * @param cbToRead The number of bytes to read. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbRead parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * read. This can be NULL if @a fBlocking is true. + * @sa RTVfsFileRead, RTFileRead, RTPipeRead, RTPipeReadBlocking, + * RTSocketRead + */ +RTDECL(int) RTVfsIoStrmRead(RTVFSIOSTREAM hVfsIos, void *pvBuf, size_t cbToRead, bool fBlocking, size_t *pcbRead); +RTDECL(int) RTVfsIoStrmReadAt(RTVFSIOSTREAM hVfsIos, RTFOFF off, void *pvBuf, size_t cbToRead, bool fBlocking, size_t *pcbRead); + +/** + * Write bytes to the I/O stream. + * + * @returns IPRT status code. + * @retval VERR_ACCESS_DENIED if the stream is not writable. + * + * @param hVfsIos The VFS I/O stream handle. + * @param pvBuf The bytes to write. + * @param cbToWrite The number of bytes to write. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbWritten parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * written. This can be NULL if @a fBlocking is true. + * @sa RTVfsFileWrite, RTFileWrite, RTPipeWrite, RTPipeWriteBlocking, + * RTSocketWrite + */ +RTDECL(int) RTVfsIoStrmWrite(RTVFSIOSTREAM hVfsIos, const void *pvBuf, size_t cbToWrite, bool fBlocking, size_t *pcbWritten); +RTDECL(int) RTVfsIoStrmWriteAt(RTVFSIOSTREAM hVfsIos, RTFOFF off, const void *pvBuf, size_t cbToWrite, bool fBlocking, size_t *pcbWritten); + +/** + * Reads bytes from the I/O stream into a scatter buffer. + * + * @returns IPRT status code. + * @retval VINF_SUCCESS and the number of bytes read written to @a pcbRead. + * @retval VINF_TRY_AGAIN if @a fBlocking is @c false, @a pcbRead is not NULL, + * and no data was available. @a *pcbRead will be set to 0. + * @retval VINF_EOF when trying to read __beyond__ the end of the stream and + * @a pcbRead is not NULL (it will be set to the number of bytes read, + * or 0 if the end of the stream was reached before this call). + * When the last byte of the read request is the last byte in the + * stream, this status code will not be used. However, VINF_EOF is + * returned when attempting to read 0 bytes while standing at the end + * of the stream. + * @retval VERR_EOF when trying to read __beyond__ the end of the stream and + * @a pcbRead is NULL. + * @retval VERR_ACCESS_DENIED if the stream is not readable. + * + * @param hVfsIos The VFS I/O stream handle. + * @param pSgBuf Pointer to a scatter buffer descriptor. The number + * of bytes described by the segments is what will be + * attemted read. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbRead parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * read. This can be NULL if @a fBlocking is true. + * @sa RTFileSgRead, RTSocketSgRead, RTPipeRead, RTPipeReadBlocking + */ +RTDECL(int) RTVfsIoStrmSgRead(RTVFSIOSTREAM hVfsIos, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbRead); + +/** + * Write bytes to the I/O stream from a gather buffer. + * + * @returns IPRT status code. + * @retval VERR_ACCESS_DENIED if the stream is not writable. + * + * @param hVfsIos The VFS I/O stream handle. + * @param pSgBuf Pointer to a gather buffer descriptor. The number + * of bytes described by the segments is what will be + * attemted written. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbWritten parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * written. This can be NULL if @a fBlocking is true. + * @sa RTFileSgWrite, RTSocketSgWrite + */ +RTDECL(int) RTVfsIoStrmSgWrite(RTVFSIOSTREAM hVfsIos, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbWritten); + +/** + * Flush any buffered data to the I/O stream. + * + * @returns IPRT status code. + * @param hVfsIos The VFS I/O stream handle. + * @sa RTVfsFileFlush, RTFileFlush, RTPipeFlush + */ +RTDECL(int) RTVfsIoStrmFlush(RTVFSIOSTREAM hVfsIos); + +/** + * Poll for events. + * + * @returns IPRT status code. + * @param hVfsIos The VFS I/O stream handle. + * @param fEvents The events to poll for (RTPOLL_EVT_XXX). + * @param cMillies How long to wait for event to eventuate. + * @param fIntr Whether the wait is interruptible and can return + * VERR_INTERRUPTED (@c true) or if this condition + * should be hidden from the caller (@c false). + * @param pfRetEvents Where to return the event mask. + * @sa RTVfsFilePoll, RTPollSetAdd, RTPoll, RTPollNoResume. + */ +RTDECL(int) RTVfsIoStrmPoll(RTVFSIOSTREAM hVfsIos, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr, + uint32_t *pfRetEvents); +/** + * Tells the current I/O stream position. + * + * @returns Zero or higher - where to return the I/O stream offset. Values + * below zero are IPRT status codes (VERR_XXX). + * @param hVfsIos The VFS I/O stream handle. + * @sa RTFileTell + */ +RTDECL(RTFOFF) RTVfsIoStrmTell(RTVFSIOSTREAM hVfsIos); + +/** + * Skips @a cb ahead in the stream. + * + * @returns IPRT status code. + * @param hVfsIos The VFS I/O stream handle. + * @param cb The number bytes to skip. + */ +RTDECL(int) RTVfsIoStrmSkip(RTVFSIOSTREAM hVfsIos, RTFOFF cb); + +/** + * Fills the stream with @a cb zeros. + * + * @returns IPRT status code. + * @param hVfsIos The VFS I/O stream handle. + * @param cb The number of zero bytes to insert. + */ +RTDECL(int) RTVfsIoStrmZeroFill(RTVFSIOSTREAM hVfsIos, RTFOFF cb); + +/** + * Checks if we're at the end of the I/O stream. + * + * @returns true if at EOS, otherwise false. + * @param hVfsIos The VFS I/O stream handle. + */ +RTDECL(bool) RTVfsIoStrmIsAtEnd(RTVFSIOSTREAM hVfsIos); + +/** + * Process the rest of the stream, checking if it's all valid UTF-8 encoding. + * + * @returns VBox status cod.e + * + * @param hVfsIos The VFS I/O stream handle. + * @param fFlags Flags governing the validation, see + * RTVFS_VALIDATE_UTF8_XXX. + * @param poffError Where to return the error offset. Optional. + */ +RTDECL(int) RTVfsIoStrmValidateUtf8Encoding(RTVFSIOSTREAM hVfsIos, uint32_t fFlags, PRTFOFF poffError); + +/** @defgroup RTVFS_VALIDATE_UTF8_XXX RTVfsIoStrmValidateUtf8Encoding flags. + * @{ */ +/** The text must not contain any null terminator codepoints. */ +#define RTVFS_VALIDATE_UTF8_NO_NULL RT_BIT_32(0) +/** The codepoints must be in the range covered by RTC-3629. */ +#define RTVFS_VALIDATE_UTF8_BY_RTC_3629 RT_BIT_32(1) +/** Mask of valid flags. */ +#define RTVFS_VALIDATE_UTF8_VALID_MASK UINT32_C(0x00000003) +/** @} */ + +/** @} */ + + +/** @defgroup grp_vfs_file VFS File API + * @{ + */ +RTDECL(int) RTVfsFileOpen(RTVFS hVfs, const char *pszFilename, uint64_t fOpen, PRTVFSFILE phVfsFile); + +/** + * Create a VFS file handle from a standard IPRT file handle (RTFILE). + * + * @returns IPRT status code. + * @param hFile The standard IPRT file handle. + * @param fOpen The flags the handle was opened with. Pass 0 to + * have these detected. + * @param fLeaveOpen Whether to leave the handle open when the VFS file + * is released, or to close it (@c false). + * @param phVfsFile Where to return the VFS file handle. + */ +RTDECL(int) RTVfsFileFromRTFile(RTFILE hFile, uint64_t fOpen, bool fLeaveOpen, PRTVFSFILE phVfsFile); +RTDECL(RTHCUINTPTR) RTVfsFileToNative(RTFILE hVfsFile); + +/** + * Convert the VFS file handle to a VFS I/O stream handle. + * + * @returns The VFS I/O stream handle on success, this must be released. + * NIL_RTVFSIOSTREAM if the file handle is invalid. + * @param hVfsFile The VFS file handle. + * @sa RTVfsIoStrmToFile + */ +RTDECL(RTVFSIOSTREAM) RTVfsFileToIoStream(RTVFSFILE hVfsFile); + +/** + * Retains a reference to the VFS file handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVfsFile The VFS file handle. + */ +RTDECL(uint32_t) RTVfsFileRetain(RTVFSFILE hVfsFile); + +/** + * Releases a reference to the VFS file handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVfsFile The VFS file handle. + */ +RTDECL(uint32_t) RTVfsFileRelease(RTVFSFILE hVfsFile); + +/** + * Query information about the object. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if the @a enmAddAttr value is not handled by the + * implementation. + * + * @param hVfsObj The VFS object handle. + * @param pObjInfo Where to return the info. + * @param enmAddAttr Which additional attributes should be retrieved. + * @sa RTVfsObjQueryInfo, RTVfsFsStrmQueryInfo, RTVfsDirQueryInfo, + * RTVfsIoStrmQueryInfo, RTVfsFileQueryInfo, RTFileQueryInfo, + * RTPathQueryInfo. + */ +RTDECL(int) RTVfsFileQueryInfo(RTVFSFILE hVfsFile, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); + +/** + * Read bytes from the file at the current position. + * + * @returns IPRT status code. + * @retval VINF_SUCCESS and the number of bytes read written to @a pcbRead. + * @retval VINF_TRY_AGAIN if @a fBlocking is @c false, @a pcbRead is not NULL, + * and no data was available. @a *pcbRead will be set to 0. + * @retval VINF_EOF when trying to read __beyond__ the end of the file and + * @a pcbRead is not NULL (it will be set to the number of bytes read, + * or 0 if the end of the file was reached before this call). + * When the last byte of the read request is the last byte in the + * file, this status code will not be used. However, VINF_EOF is + * returned when attempting to read 0 bytes while standing at the end + * of the file. + * @retval VERR_EOF when trying to read __beyond__ the end of the file and + * @a pcbRead is NULL. + * @retval VERR_ACCESS_DENIED if the file is not readable. + * + * @param hVfsFile The VFS file handle. + * @param pvBuf Where to store the read bytes. + * @param cbToRead The number of bytes to read. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbRead parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * read. This can be NULL if @a fBlocking is true. + * @sa RTVfsIoStrmRead, RTFileRead, RTPipeRead, RTPipeReadBlocking, + * RTSocketRead + */ +RTDECL(int) RTVfsFileRead(RTVFSFILE hVfsFile, void *pvBuf, size_t cbToRead, size_t *pcbRead); +RTDECL(int) RTVfsFileReadAt(RTVFSFILE hVfsFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead); + +/** + * Write bytes to the file at the current position. + * + * @returns IPRT status code. + * @retval VERR_ACCESS_DENIED if the file is not writable. + * + * @param hVfsFile The VFS file handle. + * @param pvBuf The bytes to write. + * @param cbToWrite The number of bytes to write. + * @param fBlocking Whether the call is blocking (@c true) or not. If + * not, the @a pcbWritten parameter must not be NULL. + * @param pcbRead Where to always store the number of bytes actually + * written. This can be NULL if @a fBlocking is true. + * @sa RTVfsIoStrmRead, RTFileWrite, RTPipeWrite, RTPipeWriteBlocking, + * RTSocketWrite + */ +RTDECL(int) RTVfsFileWrite(RTVFSFILE hVfsFile, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); +RTDECL(int) RTVfsFileWriteAt(RTVFSFILE hVfsFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); + +/** + * Flush any buffered data to the file. + * + * @returns IPRT status code. + * @param hVfsFile The VFS file handle. + * @sa RTVfsIoStrmFlush, RTFileFlush, RTPipeFlush + */ +RTDECL(int) RTVfsFileFlush(RTVFSFILE hVfsFile); + +/** + * Poll for events. + * + * @returns IPRT status code. + * @param hVfsFile The VFS file handle. + * @param fEvents The events to poll for (RTPOLL_EVT_XXX). + * @param cMillies How long to wait for event to eventuate. + * @param fIntr Whether the wait is interruptible and can return + * VERR_INTERRUPTED (@c true) or if this condition + * should be hidden from the caller (@c false). + * @param pfRetEvents Where to return the event mask. + * @sa RTVfsIoStrmPoll, RTPollSetAdd, RTPoll, RTPollNoResume. + */ +RTDECL(RTFOFF) RTVfsFilePoll(RTVFSFILE hVfsFile, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr, + uint32_t *pfRetEvents); + +/** + * Tells the current file position. + * + * @returns Zero or higher - where to return the file offset. Values + * below zero are IPRT status codes (VERR_XXX). + * @param hVfsFile The VFS file handle. + * @sa RTFileTell, RTVfsIoStrmTell. + */ +RTDECL(RTFOFF) RTVfsFileTell(RTVFSFILE hVfsFile); + +/** + * Changes the current read/write position of a file. + * + * @returns IPRT status code. + * + * @param hVfsFile The VFS file handle. + * @param offSeek The seek offset. + * @param uMethod The seek emthod. + * @param poffActual Where to optionally return the new file offset. + * + * @sa RTFileSeek + */ +RTDECL(int) RTVfsFileSeek(RTVFSFILE hVfsFile, RTFOFF offSeek, uint32_t uMethod, uint64_t *poffActual); + +RTDECL(int) RTVfsFileSetSize(RTVFSFILE hVfsFile, uint64_t cbSize); +RTDECL(int) RTVfsFileGetSize(RTVFSFILE hVfsFile, uint64_t *pcbSize); +RTDECL(RTFOFF) RTVfsFileGetMaxSize(RTVFSFILE hVfsFile); +RTDECL(int) RTVfsFileGetMaxSizeEx(RTVFSFILE hVfsFile, PRTFOFF pcbMax); + +/** @} */ + + +/** @defgroup grp_vfs_misc VFS Miscellaneous + * @{ + */ + +/** + * Memorizes the I/O stream as a file backed by memory. + * + * @returns VBox status code. + * + * @param hVfsIos The VFS I/O stream to memorize. This will be read + * to the end on success, on failure its position is + * undefined. + * @param fFlags A combination of RTFILE_O_READ and RTFILE_O_WRITE. + * @param phVfsFile Where to return the handle to the memory file on + * success. + */ +RTDECL(int) RTVfsMemorizeIoStreamAsFile(RTVFSIOSTREAM hVfsIos, uint32_t fFlags, PRTVFSFILE phVfsFile); + + +/** + * Pumps data from one I/O stream to another. + * + * The data is read in chunks from @a hVfsIosSrc and written to @a hVfsIosDst + * until @hVfsIosSrc indicates end of stream. + * + * @returns IPRT status code + * + * @param hVfsIosSrc The input stream. + * @param hVfsIosDst The output stream. + * @param cbBufHint Hints at a good temporary buffer size, pass 0 if + * clueless. + */ +RTDECL(int) RTVfsUtilPumpIoStreams(RTVFSIOSTREAM hVfsIosSrc, RTVFSIOSTREAM hVfsIosDst, size_t cbBufHint); + +/** @} */ + + +/** @defgroup grp_rt_vfs_chain VFS Chains + * + * VFS chains is for doing pipe like things with VFS objects from the command + * line. Imagine you want to cat the readme.gz of an ISO you could do + * something like: + * RTCat :iprtvfs:vfs(isofs,./mycd.iso)|ios(open,readme.gz)|ios(gunzip) + * or + * RTCat :iprtvfs:ios(isofs,./mycd.iso,/readme.gz)|ios(gunzip) + * + * The "isofs", "open" and "gunzip" bits in the above examples are chain + * element providers registered with IPRT. See RTVFSCHAINELEMENTREG for how + * these works. + * + * @{ */ + +/** The path prefix used to identify an VFS chain specification. */ +#define RTVFSCHAIN_SPEC_PREFIX ":iprtvfs:" + +RTDECL(int) RTVfsChainOpenVfs( const char *pszSpec, PRTVFS phVfs, const char **ppszError); +RTDECL(int) RTVfsChainOpenFsStream( const char *pszSpec, PRTVFSFSSTREAM phVfsFss, const char **ppszError); +RTDECL(int) RTVfsChainOpenDir( const char *pszSpec, uint64_t fOpen, PRTVFSDIR phVfsDir, const char **ppszError); +RTDECL(int) RTVfsChainOpenFile( const char *pszSpec, uint64_t fOpen, PRTVFSFILE phVfsFile, const char **ppszError); +RTDECL(int) RTVfsChainOpenSymlink( const char *pszSpec, PRTVFSSYMLINK phVfsSym, const char **ppszError); +RTDECL(int) RTVfsChainOpenIoStream( const char *pszSpec, uint64_t fOpen, PRTVFSIOSTREAM phVfsIos, const char **ppszError); + +/** + * Tests if the given string is a chain specification or not. + * + * @returns true if it is, false if it isn't. + * @param pszSpec The alleged chain spec. + */ +RTDECL(bool) RTVfsChainIsSpec(const char *pszSpec); + +/** @} */ + + +/** @} */ + +RT_C_DECLS_END + +#endif /* !___iprt_vfs_h */ + |