diff options
Diffstat (limited to 'generic/tclZipfs.c')
| -rw-r--r-- | generic/tclZipfs.c | 139 |
1 files changed, 80 insertions, 59 deletions
diff --git a/generic/tclZipfs.c b/generic/tclZipfs.c index 53eac94..5450784 100644 --- a/generic/tclZipfs.c +++ b/generic/tclZipfs.c @@ -16,7 +16,7 @@ * projects. * * Helpful docs: - * https://pkware.cachefly.net/webdocs/APPNOTE/APPNOTE-6.3.9.TXT + * https://pkware.cachefly.net/webdocs/APPNOTE/APPNOTE-6.3.9.TXT * https://libzip.org/specifications/appnote_iz.txt */ @@ -319,6 +319,7 @@ static int InitWritableChannel(Tcl_Interp *interp, ZipChannel *info, ZipEntry *z, int trunc); static int ListMountPoints(Tcl_Interp *interp); static int ContainsMountPoint(const char *path, int pathLen); +static void CleanupMount(ZipFile *zf); static void SerializeCentralDirectoryEntry( const unsigned char *start, const unsigned char *end, unsigned char *buf, @@ -364,10 +365,7 @@ static int ZipFSLoadFile(Tcl_Interp *interp, Tcl_Obj *path, Tcl_FSUnloadFileProc **unloadProcPtr, int flags); static int ZipMapArchive(Tcl_Interp *interp, ZipFile *zf, void *handle); -static void ZipfsExitHandler(void *clientData); -static void ZipfsMountExitHandler(void *clientData); static void ZipfsSetup(void); -static void ZipfsFinalize(void); static int ZipChannelClose(void *instanceData, Tcl_Interp *interp, int flags); static Tcl_DriverGetHandleProc ZipChannelGetFile; @@ -1663,9 +1661,15 @@ ZipFSOpenArchive( ZIPFS_POSIX_ERROR(interp, "file read error"); goto error; } - Tcl_Close(interp, zf->chan); - zf->chan = NULL; } + /* + * Close the Tcl channel. If the file was mapped, the mapping is + * unaffected. It is important to close the channel otherwise there is a + * potential chicken and egg issue at finalization time as the channels + * are closed before the file systems are dismounted. + */ + Tcl_Close(interp, zf->chan); + zf->chan = NULL; return ZipFSFindTOC(interp, needZip, zf); /* @@ -1885,7 +1889,6 @@ ZipFSCatalogFilesystem( */ zf->mountPoint = (char *) Tcl_GetHashKey(&ZipFS.zipHash, hPtr); - Tcl_CreateExitHandler(ZipfsMountExitHandler, zf); zf->mountPointLen = strlen(zf->mountPoint); zf->nameLength = strlen(zipname); @@ -2133,7 +2136,6 @@ ZipfsSetup(void) Tcl_Alloc(strlen(ZIPFS_FALLBACK_ENCODING) + 1); strcpy(ZipFS.fallbackEntryEncoding, ZIPFS_FALLBACK_ENCODING); ZipFS.initialized = 1; - Tcl_CreateExitHandler(ZipfsExitHandler, NULL); } /* @@ -2187,6 +2189,42 @@ ListMountPoints( } /* + *------------------------------------------------------------------------ + * + * CleanupMount -- + * + * Releases all resources associated with a mounted archive. There + * must not be any open files in the archive. + * + * Caller MUST be holding WriteLock() before calling this function. + * + * Results: + * None. + * + * Side effects: + * Memory associated with the mounted archive is deallocated. + *------------------------------------------------------------------------ + */ +static void +CleanupMount(ZipFile *zf) /* Mount point */ +{ + ZipEntry *z, *znext; + Tcl_HashEntry *hPtr; + for (z = zf->entries; z; z = znext) { + znext = z->next; + hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, z->name); + if (hPtr) { + Tcl_DeleteHashEntry(hPtr); + } + if (z->data) { + Tcl_Free(z->data); + } + Tcl_Free(z); + } + zf->entries = NULL; +} + +/* *------------------------------------------------------------------------- * * DescribeMounted -- @@ -2328,6 +2366,7 @@ TclZipfs_MountBuffer( { ZipFile *zf; + /* TODO - how come a *read* lock suffices for initialzing ? */ ReadLock(); if (!ZipFS.initialized) { ZipfsSetup(); @@ -2418,7 +2457,6 @@ TclZipfs_Unmount( const char *mountPoint) /* Mount point path. */ { ZipFile *zf; - ZipEntry *z, *znext; Tcl_HashEntry *hPtr; Tcl_DString dsm; int ret = TCL_OK, unmounted = 0; @@ -2456,19 +2494,9 @@ TclZipfs_Unmount( * still cleaning things up. */ - for (z = zf->entries; z; z = znext) { - znext = z->next; - hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, z->name); - if (hPtr) { - Tcl_DeleteHashEntry(hPtr); - } - if (z->data) { - Tcl_Free(z->data); - } - Tcl_Free(z); - } + CleanupMount(zf); ZipFSCloseArchive(interp, zf); - Tcl_DeleteExitHandler(ZipfsMountExitHandler, zf); + Tcl_Free(zf); unmounted = 1; @@ -6171,53 +6199,46 @@ ZipfsAppHookFindTclInit( } #endif -static void -ZipfsExitHandler( - TCL_UNUSED(void *) -) +void TclZipfsFinalize(void) { + /* + * Finalization steps: + * For every mounted archive, if it no longer has any open handles + * clean up the mount and associated zip file entries. + * If there are no more mounted archives, clean up and free the + * ZipFS.fileHash and ZipFS.zipHash tables. + */ + WriteLock(); + Tcl_HashEntry *hPtr; - Tcl_HashSearch search; - if (ZipFS.initialized != -1) { - hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search); - if (hPtr == NULL) { - ZipfsFinalize(); - } else { - /* ZipFS.fallbackEntryEncoding was already freed by - * ZipfsMountExitHandler - */ + Tcl_HashSearch zipSearch; + for (hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &zipSearch); hPtr; + hPtr = Tcl_NextHashEntry(&zipSearch)) { + ZipFile *zf = (ZipFile *) Tcl_GetHashValue(hPtr); + if (zf->numOpen == 0) { + Tcl_DeleteHashEntry(hPtr); + CleanupMount(zf); + ZipFSCloseArchive(NULL, zf); + Tcl_Free(zf); } } -} - -static void -ZipfsFinalize(void) { - Tcl_FSUnregister(&zipfsFilesystem); - Tcl_DeleteHashTable(&ZipFS.fileHash); - Tcl_Free(ZipFS.fallbackEntryEncoding); - ZipFS.initialized = -1; -} - -static void -ZipfsMountExitHandler( - void *clientData) -{ - Tcl_HashEntry *hPtr; - Tcl_HashSearch search; - - ZipFile *zf = (ZipFile *) clientData; - - if (TCL_OK != TclZipfs_Unmount(NULL, zf->mountPoint)) { - Tcl_Panic("tried to unmount busy filesystem"); - } - hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search); + hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &zipSearch); if (hPtr == NULL) { - ZipfsFinalize(); + hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &zipSearch); + if (hPtr == NULL) { + /* Both hash tables empty. Free all resources */ + Tcl_FSUnregister(&zipfsFilesystem); + Tcl_DeleteHashTable(&ZipFS.fileHash); + Tcl_DeleteHashTable(&ZipFS.zipHash); + Tcl_Free(ZipFS.fallbackEntryEncoding); + ZipFS.initialized = 0; + } } + Unlock(); } - + /* *------------------------------------------------------------------------- * |