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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/zip/tar.cpp | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/zip/tar.cpp b/src/VBox/Runtime/common/zip/tar.cpp new file mode 100644 index 00000000..7b371149 --- /dev/null +++ b/src/VBox/Runtime/common/zip/tar.cpp @@ -0,0 +1,703 @@ +/* $Id: tar.cpp $ */ +/** @file + * IPRT - Tar archive I/O. + */ + +/* + * Copyright (C) 2009-2019 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. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "internal/iprt.h" +#include <iprt/tar.h> + +#include <iprt/asm.h> +#include <iprt/assert.h> +#include <iprt/err.h> +#include <iprt/file.h> +#include <iprt/mem.h> +#include <iprt/path.h> +#include <iprt/string.h> +#include <iprt/vfs.h> +#include <iprt/zip.h> + + +#include "internal/magics.h" +#include "tar.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** @name RTTARRECORD::h::linkflag + * @{ */ +#define LF_OLDNORMAL '\0' /**< Normal disk file, Unix compatible */ +#define LF_NORMAL '0' /**< Normal disk file */ +#define LF_LINK '1' /**< Link to previously dumped file */ +#define LF_SYMLINK '2' /**< Symbolic link */ +#define LF_CHR '3' /**< Character special file */ +#define LF_BLK '4' /**< Block special file */ +#define LF_DIR '5' /**< Directory */ +#define LF_FIFO '6' /**< FIFO special file */ +#define LF_CONTIG '7' /**< Contiguous file */ +/** @} */ + +/** + * A tar file header. + */ +typedef union RTTARRECORD +{ + char d[512]; + struct h + { + char name[100]; + char mode[8]; + char uid[8]; + char gid[8]; + char size[12]; + char mtime[12]; + char chksum[8]; + char linkflag; + char linkname[100]; + char magic[8]; + char uname[32]; + char gname[32]; + char devmajor[8]; + char devminor[8]; + } h; +} RTTARRECORD; +AssertCompileSize(RTTARRECORD, 512); +AssertCompileMemberOffset(RTTARRECORD, h.size, 100+8*3); +AssertCompileMemberSize(RTTARRECORD, h.name, RTTAR_NAME_MAX+1); +/** Pointer to a tar file header. */ +typedef RTTARRECORD *PRTTARRECORD; + +/** Pointer to a tar file handle. */ +typedef struct RTTARFILEINTERNAL *PRTTARFILEINTERNAL; + +/** + * The internal data of a tar handle. + */ +typedef struct RTTARINTERNAL +{ + /** The magic (RTTAR_MAGIC). */ + uint32_t u32Magic; + /** The handle to the tar file. */ + RTFILE hTarFile; + /** The open mode for hTarFile. */ + uint32_t fOpenMode; + /** Whether a file within the archive is currently open for writing. + * Only one can be open. */ + bool fFileOpenForWrite; + /** The tar file VFS handle (for reading). */ + RTVFSFILE hVfsFile; + /** The tar file system VFS handle. */ + RTVFSFSSTREAM hVfsFss; + /** Set if hVfsFss is at the start of the stream and doesn't need rewinding. */ + bool fFssAtStart; +} RTTARINTERNAL; +/** Pointer to a the internal data of a tar handle. */ +typedef RTTARINTERNAL* PRTTARINTERNAL; + +/** + * The internal data of a file within a tar file. + */ +typedef struct RTTARFILEINTERNAL +{ + /** The magic (RTTARFILE_MAGIC). */ + uint32_t u32Magic; + /** The open mode. */ + uint32_t fOpenMode; + /** Pointer to back to the tar file. */ + PRTTARINTERNAL pTar; + /** The name of the file. */ + char *pszFilename; + /** The offset into the archive where the file header starts. */ + uint64_t offStart; + /** The size of the file. */ + uint64_t cbSize; + /** The size set by RTTarFileSetSize(). */ + uint64_t cbSetSize; + /** The current offset within this file. */ + uint64_t offCurrent; + /** The VFS I/O stream (only for reading atm). */ + RTVFSIOSTREAM hVfsIos; +} RTTARFILEINTERNAL; +/** Pointer to the internal data of a tar file. */ +typedef RTTARFILEINTERNAL *PRTTARFILEINTERNAL; + + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ + +/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */ +/* RTTAR */ +#define RTTAR_VALID_RETURN_RC(hHandle, rc) \ + do { \ + AssertPtrReturn((hHandle), (rc)); \ + AssertReturn((hHandle)->u32Magic == RTTAR_MAGIC, (rc)); \ + } while (0) +/* RTTARFILE */ +#define RTTARFILE_VALID_RETURN_RC(hHandle, rc) \ + do { \ + AssertPtrReturn((hHandle), (rc)); \ + AssertReturn((hHandle)->u32Magic == RTTARFILE_MAGIC, (rc)); \ + } while (0) + +/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */ +/* RTTAR */ +#define RTTAR_VALID_RETURN(hHandle) RTTAR_VALID_RETURN_RC((hHandle), VERR_INVALID_HANDLE) +/* RTTARFILE */ +#define RTTARFILE_VALID_RETURN(hHandle) RTTARFILE_VALID_RETURN_RC((hHandle), VERR_INVALID_HANDLE) + +/** Validates a handle and returns (void) if not valid. */ +/* RTTAR */ +#define RTTAR_VALID_RETURN_VOID(hHandle) \ + do { \ + AssertPtrReturnVoid(hHandle); \ + AssertReturnVoid((hHandle)->u32Magic == RTTAR_MAGIC); \ + } while (0) +/* RTTARFILE */ +#define RTTARFILE_VALID_RETURN_VOID(hHandle) \ + do { \ + AssertPtrReturnVoid(hHandle); \ + AssertReturnVoid((hHandle)->u32Magic == RTTARFILE_MAGIC); \ + } while (0) + + +RTR3DECL(int) RTTarOpen(PRTTAR phTar, const char *pszTarname, uint32_t fMode) +{ + AssertReturn(fMode & RTFILE_O_WRITE, VERR_INVALID_PARAMETER); + + /* + * Create a tar instance. + */ + PRTTARINTERNAL pThis = (PRTTARINTERNAL)RTMemAllocZ(sizeof(RTTARINTERNAL)); + if (!pThis) + return VERR_NO_MEMORY; + + pThis->u32Magic = RTTAR_MAGIC; + pThis->fOpenMode = fMode; + pThis->hVfsFile = NIL_RTVFSFILE; + pThis->hVfsFss = NIL_RTVFSFSSTREAM; + pThis->fFssAtStart = false; + + /* + * Open the tar file. + */ + int rc = RTFileOpen(&pThis->hTarFile, pszTarname, fMode); + if (RT_SUCCESS(rc)) + { + *phTar = pThis; + return VINF_SUCCESS; + } + + RTMemFree(pThis); + return rc; +} + + +RTR3DECL(int) RTTarClose(RTTAR hTar) +{ + if (hTar == NIL_RTTAR) + return VINF_SUCCESS; + + PRTTARINTERNAL pInt = hTar; + RTTAR_VALID_RETURN(pInt); + + int rc = VINF_SUCCESS; + + /* gtar gives a warning, but the documentation says EOF is indicated by a + * zero block. Disabled for now. */ +#if 0 + { + /* Append the EOF record which is filled all by zeros */ + RTTARRECORD record; + RT_ZERO(record); + rc = RTFileWrite(pInt->hTarFile, &record, sizeof(record), NULL); + } +#endif + + if (pInt->hVfsFss != NIL_RTVFSFSSTREAM) + { + uint32_t cRefs = RTVfsFsStrmRelease(pInt->hVfsFss); Assert(cRefs != UINT32_MAX); NOREF(cRefs); + pInt->hVfsFss = NIL_RTVFSFSSTREAM; + } + + if (pInt->hVfsFile != NIL_RTVFSFILE) + { + uint32_t cRefs = RTVfsFileRelease(pInt->hVfsFile); Assert(cRefs != UINT32_MAX); NOREF(cRefs); + pInt->hVfsFile = NIL_RTVFSFILE; + } + + if (pInt->hTarFile != NIL_RTFILE) + { + rc = RTFileClose(pInt->hTarFile); + pInt->hTarFile = NIL_RTFILE; + } + + pInt->u32Magic = RTTAR_MAGIC_DEAD; + + RTMemFree(pInt); + + return rc; +} + + +/** + * Creates a tar file handle for a read-only VFS stream object. + * + * @returns IPRT status code. + * @param pszName The file name. Automatically freed on failure. + * @param hVfsIos The VFS I/O stream we create the handle around. + * The reference is NOT consumed. + * @param fOpen The open flags. + * @param ppFile Where to return the handle. + */ +static int rtTarFileCreateHandleForReadOnly(char *pszName, RTVFSIOSTREAM hVfsIos, uint32_t fOpen, PRTTARFILEINTERNAL *ppFile) +{ + int rc; + PRTTARFILEINTERNAL pNewFile = (PRTTARFILEINTERNAL)RTMemAllocZ(sizeof(*pNewFile)); + if (pNewFile) + { + RTFSOBJINFO ObjInfo; + rc = RTVfsIoStrmQueryInfo(hVfsIos, &ObjInfo, RTFSOBJATTRADD_UNIX); + if (RT_SUCCESS(rc)) + { + pNewFile->u32Magic = RTTARFILE_MAGIC; + pNewFile->pTar = NULL; + pNewFile->pszFilename = pszName; + pNewFile->offStart = UINT64_MAX; + pNewFile->cbSize = ObjInfo.cbObject; + pNewFile->cbSetSize = 0; + pNewFile->offCurrent = 0; + pNewFile->fOpenMode = fOpen; + pNewFile->hVfsIos = hVfsIos; + + uint32_t cRefs = RTVfsIoStrmRetain(hVfsIos); Assert(cRefs != UINT32_MAX); NOREF(cRefs); + + *ppFile = pNewFile; + return VINF_SUCCESS; + } + + RTMemFree(pNewFile); + } + else + rc = VERR_NO_MEMORY; + RTStrFree(pszName); + return rc; +} + + +/* Only used for write handles. */ +static PRTTARFILEINTERNAL rtTarFileCreateForWrite(PRTTARINTERNAL pInt, const char *pszFilename, uint32_t fOpen) +{ + PRTTARFILEINTERNAL pFileInt = (PRTTARFILEINTERNAL)RTMemAllocZ(sizeof(RTTARFILEINTERNAL)); + if (!pFileInt) + return NULL; + + pFileInt->u32Magic = RTTARFILE_MAGIC; + pFileInt->pTar = pInt; + pFileInt->fOpenMode = fOpen; + pFileInt->pszFilename = RTStrDup(pszFilename); + pFileInt->hVfsIos = NIL_RTVFSIOSTREAM; + if (pFileInt->pszFilename) + return pFileInt; + + RTMemFree(pFileInt); + return NULL; + +} + + +RTR3DECL(int) RTTarFileOpen(RTTAR hTar, PRTTARFILE phFile, const char *pszFilename, uint32_t fOpen) +{ + /* Write only interface now. */ + AssertReturn(fOpen & RTFILE_O_WRITE, VERR_INVALID_PARAMETER); + + PRTTARINTERNAL pInt = hTar; + RTTAR_VALID_RETURN(pInt); + + if (!pInt->hTarFile) + return VERR_INVALID_HANDLE; + + if (fOpen & RTFILE_O_WRITE) + { + if (!(pInt->fOpenMode & RTFILE_O_WRITE)) + return VERR_WRITE_PROTECT; + if (pInt->fFileOpenForWrite) + return VERR_TOO_MANY_OPEN_FILES; + } + + int rc = VINF_SUCCESS; + if (!(fOpen & RTFILE_O_WRITE)) + { + /* + * Rewind the stream if necessary. + */ + if (!pInt->fFssAtStart) + { + if (pInt->hVfsFss != NIL_RTVFSFSSTREAM) + { + uint32_t cRefs = RTVfsFsStrmRelease(pInt->hVfsFss); Assert(cRefs != UINT32_MAX); NOREF(cRefs); + pInt->hVfsFss = NIL_RTVFSFSSTREAM; + } + + if (pInt->hVfsFile == NIL_RTVFSFILE) + { + rc = RTVfsFileFromRTFile(pInt->hTarFile, RTFILE_O_READ, true /*fLeaveOpen*/, &pInt->hVfsFile); + if (RT_FAILURE(rc)) + return rc; + } + + RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(pInt->hVfsFile); + rc = RTZipTarFsStreamFromIoStream(hVfsIos, 0 /*fFlags*/, &pInt->hVfsFss); + RTVfsIoStrmRelease(hVfsIos); + if (RT_FAILURE(rc)) + return rc; + } + + /* + * Search the file system stream. + */ + pInt->fFssAtStart = false; + for (;;) + { + char *pszName; + RTVFSOBJTYPE enmType; + RTVFSOBJ hVfsObj; + rc = RTVfsFsStrmNext(pInt->hVfsFss, &pszName, &enmType, &hVfsObj); + if (rc == VERR_EOF) + return VERR_FILE_NOT_FOUND; + if (RT_FAILURE(rc)) + return rc; + + if (!RTStrCmp(pszName, pszFilename)) + { + if (enmType == RTVFSOBJTYPE_FILE || enmType == RTVFSOBJTYPE_IO_STREAM) + rc = rtTarFileCreateHandleForReadOnly(pszName, RTVfsObjToIoStream(hVfsObj), fOpen, phFile); + else + { + rc = VERR_UNEXPECTED_FS_OBJ_TYPE; + RTStrFree(pszName); + } + RTVfsObjRelease(hVfsObj); + break; + } + RTStrFree(pszName); + RTVfsObjRelease(hVfsObj); + } /* Search loop. */ + } + else + { + PRTTARFILEINTERNAL pFileInt = rtTarFileCreateForWrite(pInt, pszFilename, fOpen); + if (!pFileInt) + return VERR_NO_MEMORY; + + pInt->fFileOpenForWrite = true; + + /* If we are in write mode, we also in append mode. Add an dummy + * header at the end of the current file. It will be filled by the + * close operation. */ + rc = RTFileSeek(pFileInt->pTar->hTarFile, 0, RTFILE_SEEK_END, &pFileInt->offStart); + if (RT_SUCCESS(rc)) + { + RTTARRECORD record; + RT_ZERO(record); + rc = RTFileWrite(pFileInt->pTar->hTarFile, &record, sizeof(RTTARRECORD), NULL); + } + + if (RT_SUCCESS(rc)) + *phFile = (RTTARFILE)pFileInt; + else + { + /* Cleanup on failure */ + if (pFileInt->pszFilename) + RTStrFree(pFileInt->pszFilename); + RTMemFree(pFileInt); + } + } + + return rc; +} + + +static void rtTarSizeToRec(PRTTARRECORD pRecord, uint64_t cbSize) +{ + /* + * Small enough for the standard octal string encoding? + * + * Note! We could actually use the terminator character as well if we liked, + * but let not do that as it's easier to test this way. + */ + if (cbSize < _4G * 2U) + RTStrPrintf(pRecord->h.size, sizeof(pRecord->h.size), "%0.11llo", cbSize); + else + { + /* + * Base 256 extension. Set the highest bit of the left most character. + * We don't deal with negatives here, cause the size have to be greater + * than zero. + * + * Note! The base-256 extension are never used by gtar or libarchive + * with the "ustar \0" format version, only the later + * "ustar\000" version. However, this shouldn't cause much + * trouble as they are not picky about what they read. + */ + size_t cchField = sizeof(pRecord->h.size) - 1; + unsigned char *puchField = (unsigned char*)pRecord->h.size; + puchField[0] = 0x80; + do + { + puchField[cchField--] = cbSize & 0xff; + cbSize >>= 8; + } while (cchField); + } +} + + +static int rtTarCreateHeaderRecord(PRTTARRECORD pRecord, const char *pszSrcName, uint64_t cbSize, + RTUID uid, RTGID gid, RTFMODE fmode, int64_t mtime) +{ + /** @todo check for field overflows. */ + /* Fill the header record */ +// RT_ZERO(pRecord); - done by the caller. + /** @todo use RTStrCopy */ + size_t cb = RTStrPrintf(pRecord->h.name, sizeof(pRecord->h.name), "%s", pszSrcName); + if (cb < strlen(pszSrcName)) + return VERR_BUFFER_OVERFLOW; + RTStrPrintf(pRecord->h.mode, sizeof(pRecord->h.mode), "%0.7o", fmode); + RTStrPrintf(pRecord->h.uid, sizeof(pRecord->h.uid), "%0.7o", uid); + RTStrPrintf(pRecord->h.gid, sizeof(pRecord->h.gid), "%0.7o", gid); + rtTarSizeToRec(pRecord, cbSize); + RTStrPrintf(pRecord->h.mtime, sizeof(pRecord->h.mtime), "%0.11llo", mtime); + RTStrPrintf(pRecord->h.magic, sizeof(pRecord->h.magic), "ustar "); + RTStrPrintf(pRecord->h.uname, sizeof(pRecord->h.uname), "someone"); + RTStrPrintf(pRecord->h.gname, sizeof(pRecord->h.gname), "someone"); + pRecord->h.linkflag = LF_NORMAL; + + /* Create the checksum out of the new header */ + int32_t iUnsignedChksum, iSignedChksum; + if (rtZipTarCalcChkSum((PCRTZIPTARHDR)pRecord, &iUnsignedChksum, &iSignedChksum)) + return VERR_TAR_END_OF_FILE; + + /* Format the checksum */ + RTStrPrintf(pRecord->h.chksum, sizeof(pRecord->h.chksum), "%0.7o", iUnsignedChksum); + + return VINF_SUCCESS; +} + + +DECLINLINE(void *) rtTarMemTmpAlloc(size_t *pcbSize) +{ + *pcbSize = 0; + /* Allocate a reasonably large buffer, fall back on a tiny one. + * Note: has to be 512 byte aligned and >= 512 byte. */ + size_t cbTmp = _1M; + void *pvTmp = RTMemTmpAlloc(cbTmp); + if (!pvTmp) + { + cbTmp = sizeof(RTTARRECORD); + pvTmp = RTMemTmpAlloc(cbTmp); + } + *pcbSize = cbTmp; + return pvTmp; +} + + +static int rtTarAppendZeros(PRTTARFILEINTERNAL pFileInt, uint64_t cbSize) +{ + /* Allocate a temporary buffer for copying the tar content in blocks. */ + size_t cbTmp = 0; + void *pvTmp = rtTarMemTmpAlloc(&cbTmp); + if (!pvTmp) + return VERR_NO_MEMORY; + RT_BZERO(pvTmp, cbTmp); + + int rc = VINF_SUCCESS; + uint64_t cbAllWritten = 0; + size_t cbWritten = 0; + for (;;) + { + if (cbAllWritten >= cbSize) + break; + size_t cbToWrite = RT_MIN(cbSize - cbAllWritten, cbTmp); + rc = RTTarFileWriteAt(pFileInt, pFileInt->offCurrent, pvTmp, cbToWrite, &cbWritten); + if (RT_FAILURE(rc)) + break; + cbAllWritten += cbWritten; + } + + RTMemTmpFree(pvTmp); + + return rc; +} + + +RTR3DECL(int) RTTarFileClose(RTTARFILE hFile) +{ + /* Already closed? */ + if (hFile == NIL_RTTARFILE) + return VINF_SUCCESS; + + PRTTARFILEINTERNAL pFileInt = hFile; + RTTARFILE_VALID_RETURN(pFileInt); + + int rc = VINF_SUCCESS; + + /* In write mode: */ + if ((pFileInt->fOpenMode & (RTFILE_O_WRITE | RTFILE_O_READ)) == RTFILE_O_WRITE) + { + pFileInt->pTar->fFileOpenForWrite = false; + do + { + /* If the user has called RTTarFileSetSize in the meantime, we have + to make sure the file has the right size. */ + if (pFileInt->cbSetSize > pFileInt->cbSize) + { + rc = rtTarAppendZeros(pFileInt, pFileInt->cbSetSize - pFileInt->cbSize); + if (RT_FAILURE(rc)) + break; + } + + /* If the written size isn't 512 byte aligned, we need to fix this. */ + RTTARRECORD record; + RT_ZERO(record); + uint64_t cbSizeAligned = RT_ALIGN(pFileInt->cbSize, sizeof(RTTARRECORD)); + if (cbSizeAligned != pFileInt->cbSize) + { + /* Note the RTFile method. We didn't increase the cbSize or cbCurrentPos here. */ + rc = RTFileWriteAt(pFileInt->pTar->hTarFile, + pFileInt->offStart + sizeof(RTTARRECORD) + pFileInt->cbSize, + &record, + cbSizeAligned - pFileInt->cbSize, + NULL); + if (RT_FAILURE(rc)) + break; + } + + /* Create a header record for the file */ + /** @todo mode, gid, uid, mtime should be setable (or detected myself) */ + RTTIMESPEC time; + RTTimeNow(&time); + rc = rtTarCreateHeaderRecord(&record, pFileInt->pszFilename, pFileInt->cbSize, + 0, 0, 0600, RTTimeSpecGetSeconds(&time)); + if (RT_FAILURE(rc)) + break; + + /* Write this at the start of the file data */ + rc = RTFileWriteAt(pFileInt->pTar->hTarFile, pFileInt->offStart, &record, sizeof(RTTARRECORD), NULL); + if (RT_FAILURE(rc)) + break; + } + while (0); + } + + /* + * Now cleanup and delete the handle. + */ + if (pFileInt->pszFilename) + RTStrFree(pFileInt->pszFilename); + if (pFileInt->hVfsIos != NIL_RTVFSIOSTREAM) + { + RTVfsIoStrmRelease(pFileInt->hVfsIos); + pFileInt->hVfsIos = NIL_RTVFSIOSTREAM; + } + pFileInt->u32Magic = RTTARFILE_MAGIC_DEAD; + RTMemFree(pFileInt); + + return rc; +} + + +RTR3DECL(int) RTTarFileReadAt(RTTARFILE hFile, uint64_t off, void *pvBuf, size_t cbToRead, size_t *pcbRead) +{ + PRTTARFILEINTERNAL pFileInt = hFile; + RTTARFILE_VALID_RETURN(pFileInt); + + size_t cbTmpRead = 0; + int rc = RTVfsIoStrmReadAt(pFileInt->hVfsIos, off, pvBuf, cbToRead, true /*fBlocking*/, &cbTmpRead); + if (RT_SUCCESS(rc)) + { + pFileInt->offCurrent = off + cbTmpRead; + if (pcbRead) + *pcbRead = cbTmpRead; + if (rc == VINF_EOF) + rc = pcbRead ? VINF_SUCCESS : VERR_EOF; + } + else if (pcbRead) + *pcbRead = 0; + return rc; +} + + +RTR3DECL(int) RTTarFileWriteAt(RTTARFILE hFile, uint64_t off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten) +{ + PRTTARFILEINTERNAL pFileInt = hFile; + RTTARFILE_VALID_RETURN(pFileInt); + + if ((pFileInt->fOpenMode & RTFILE_O_WRITE) != RTFILE_O_WRITE) + return VERR_ACCESS_DENIED; + + size_t cbTmpWritten = 0; + int rc = RTFileWriteAt(pFileInt->pTar->hTarFile, pFileInt->offStart + 512 + off, pvBuf, cbToWrite, &cbTmpWritten); + pFileInt->cbSize += cbTmpWritten; + pFileInt->offCurrent = off + cbTmpWritten; + if (pcbWritten) + *pcbWritten = cbTmpWritten; + + return rc; +} + + +RTR3DECL(int) RTTarFileGetSize(RTTARFILE hFile, uint64_t *pcbSize) +{ + /* Validate input */ + AssertPtrReturn(pcbSize, VERR_INVALID_POINTER); + + PRTTARFILEINTERNAL pFileInt = hFile; + RTTARFILE_VALID_RETURN(pFileInt); + + *pcbSize = RT_MAX(pFileInt->cbSetSize, pFileInt->cbSize); + + return VINF_SUCCESS; +} + + +RTR3DECL(int) RTTarFileSetSize(RTTARFILE hFile, uint64_t cbSize) +{ + PRTTARFILEINTERNAL pFileInt = hFile; + RTTARFILE_VALID_RETURN(pFileInt); + + if ((pFileInt->fOpenMode & RTFILE_O_WRITE) != RTFILE_O_WRITE) + return VERR_WRITE_ERROR; + + /** @todo If cbSize is smaller than pFileInt->cbSize we have to + * truncate the current file. */ + pFileInt->cbSetSize = cbSize; + + return VINF_SUCCESS; +} + |