From 9c0f5d6b348e37533bdcccf1166d6cbf1ca5c50b Mon Sep 17 00:00:00 2001 From: Narayan Kamath Date: Mon, 23 Feb 2015 14:09:31 +0000 Subject: Remove more dead code from minzip. I've added explanatory comments to mzExtractRecursive because that function will live on as a utility even after we move the zip format related logic to libziparchive. bug: 19472796 (cherry-picked from commit c9ccdfd7a42de08c47ab771b94dc5b9d1f957b95) Change-Id: I8b7fb6fa3eafb2e7ac080ef7a7eceb691b252d8a --- minzip/Zip.c | 164 +++++++++++++++++++++-------------------------------------- minzip/Zip.h | 13 ++--- 2 files changed, 64 insertions(+), 113 deletions(-) (limited to 'minzip') diff --git a/minzip/Zip.c b/minzip/Zip.c index 12e06f6..d3ff79b 100644 --- a/minzip/Zip.c +++ b/minzip/Zip.c @@ -828,7 +828,7 @@ static const char *targetEntryPath(MzPathHelper *helper, ZipEntry *pEntry) */ bool mzExtractRecursive(const ZipArchive *pArchive, const char *zipDir, const char *targetDir, - int flags, const struct utimbuf *timestamp, + const struct utimbuf *timestamp, void (*callback)(const char *fn, void *), void *cookie, struct selabel_handle *sehnd) { @@ -932,30 +932,19 @@ bool mzExtractRecursive(const ZipArchive *pArchive, break; } - /* With DRY_RUN set, invoke the callback but don't do anything else. - */ - if (flags & MZ_EXTRACT_DRY_RUN) { - if (callback != NULL) callback(targetFile, cookie); - continue; - } - - /* Create the file or directory. - */ #define UNZIP_DIRMODE 0755 #define UNZIP_FILEMODE 0644 - if (pEntry->fileName[pEntry->fileNameLen-1] == '/') { - if (!(flags & MZ_EXTRACT_FILES_ONLY)) { - int ret = dirCreateHierarchy( - targetFile, UNZIP_DIRMODE, timestamp, false, sehnd); - if (ret != 0) { - LOGE("Can't create containing directory for \"%s\": %s\n", - targetFile, strerror(errno)); - ok = false; - break; - } - LOGD("Extracted dir \"%s\"\n", targetFile); - } - } else { + /* + * Create the file or directory. We ignore directory entries + * because we recursively create paths to each file entry we encounter + * in the zip archive anyway. + * + * NOTE: A "directory entry" in a zip archive is just a zero length + * entry that ends in a "/". They're not mandatory and many tools get + * rid of them. We need to process them only if we want to preserve + * empty directories from the archive. + */ + if (pEntry->fileName[pEntry->fileNameLen-1] != '/') { /* This is not a directory. First, make sure that * the containing directory exists. */ @@ -968,97 +957,62 @@ bool mzExtractRecursive(const ZipArchive *pArchive, break; } - /* With FILES_ONLY set, we need to ignore metadata entirely, - * so treat symlinks as regular files. + /* + * The entry is a regular file or a symlink. Open the target for writing. + * + * TODO: This behavior for symlinks seems rather bizarre. For a + * symlink foo/bar/baz -> foo/tar/taz, we will create a file called + * "foo/bar/baz" whose contents are the literal "foo/tar/taz". We + * warn about this for now and preserve older behavior. */ - if (!(flags & MZ_EXTRACT_FILES_ONLY) && mzIsZipEntrySymlink(pEntry)) { - /* The entry is a symbolic link. - * The relative target of the symlink is in the - * data section of this entry. - */ - if (pEntry->uncompLen == 0) { - LOGE("Symlink entry \"%s\" has no target\n", - targetFile); - ok = false; - break; - } - char *linkTarget = malloc(pEntry->uncompLen + 1); - if (linkTarget == NULL) { - ok = false; - break; - } - ok = mzReadZipEntry(pArchive, pEntry, linkTarget, - pEntry->uncompLen); - if (!ok) { - LOGE("Can't read symlink target for \"%s\"\n", - targetFile); - free(linkTarget); - break; - } - linkTarget[pEntry->uncompLen] = '\0'; - - /* Make the link. - */ - ret = symlink(linkTarget, targetFile); - if (ret != 0) { - LOGE("Can't symlink \"%s\" to \"%s\": %s\n", - targetFile, linkTarget, strerror(errno)); - free(linkTarget); - ok = false; - break; - } - LOGD("Extracted symlink \"%s\" -> \"%s\"\n", - targetFile, linkTarget); - free(linkTarget); - } else { - /* The entry is a regular file. - * Open the target for writing. - */ - - char *secontext = NULL; + if (mzIsZipEntrySymlink(pEntry)) { + LOGE("Symlink entry \"%.*s\" will be output as a regular file.", + pEntry->fileNameLen, pEntry->fileName); + } - if (sehnd) { - selabel_lookup(sehnd, &secontext, targetFile, UNZIP_FILEMODE); - setfscreatecon(secontext); - } + char *secontext = NULL; - int fd = open(targetFile, O_CREAT|O_WRONLY|O_TRUNC|O_SYNC - , UNZIP_FILEMODE); + if (sehnd) { + selabel_lookup(sehnd, &secontext, targetFile, UNZIP_FILEMODE); + setfscreatecon(secontext); + } - if (secontext) { - freecon(secontext); - setfscreatecon(NULL); - } + int fd = open(targetFile, O_CREAT|O_WRONLY|O_TRUNC|O_SYNC, + UNZIP_FILEMODE); - if (fd < 0) { - LOGE("Can't create target file \"%s\": %s\n", - targetFile, strerror(errno)); - ok = false; - break; - } + if (secontext) { + freecon(secontext); + setfscreatecon(NULL); + } - bool ok = mzExtractZipEntryToFile(pArchive, pEntry, fd); - if (ok) { - ok = (fsync(fd) == 0); - } - if (close(fd) != 0) { - ok = false; - } - if (!ok) { - LOGE("Error extracting \"%s\"\n", targetFile); - ok = false; - break; - } + if (fd < 0) { + LOGE("Can't create target file \"%s\": %s\n", + targetFile, strerror(errno)); + ok = false; + break; + } - if (timestamp != NULL && utime(targetFile, timestamp)) { - LOGE("Error touching \"%s\"\n", targetFile); - ok = false; - break; - } + bool ok = mzExtractZipEntryToFile(pArchive, pEntry, fd); + if (ok) { + ok = (fsync(fd) == 0); + } + if (close(fd) != 0) { + ok = false; + } + if (!ok) { + LOGE("Error extracting \"%s\"\n", targetFile); + ok = false; + break; + } - LOGV("Extracted file \"%s\"\n", targetFile); - ++extractCount; + if (timestamp != NULL && utime(targetFile, timestamp)) { + LOGE("Error touching \"%s\"\n", targetFile); + ok = false; + break; } + + LOGV("Extracted file \"%s\"\n", targetFile); + ++extractCount; } if (callback != NULL) callback(targetFile, cookie); diff --git a/minzip/Zip.h b/minzip/Zip.h index 54eab32..a2b2c26 100644 --- a/minzip/Zip.h +++ b/minzip/Zip.h @@ -143,9 +143,12 @@ bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive, const ZipEntry *pEntry, unsigned char* buffer); /* - * Inflate all entries under zipDir to the directory specified by + * Inflate all files under zipDir to the directory specified by * targetDir, which must exist and be a writable directory. * + * Directory entries and symlinks are not extracted. + * + * * The immediate children of zipDir will become the immediate * children of targetDir; e.g., if the archive contains the entries * @@ -160,21 +163,15 @@ bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive, * /tmp/two * /tmp/d/three * - * flags is zero or more of the following: - * - * MZ_EXTRACT_FILES_ONLY - only unpack files, not directories or symlinks - * MZ_EXTRACT_DRY_RUN - don't do anything, but do invoke the callback - * * If timestamp is non-NULL, file timestamps will be set accordingly. * * If callback is non-NULL, it will be invoked with each unpacked file. * * Returns true on success, false on failure. */ -enum { MZ_EXTRACT_FILES_ONLY = 1, MZ_EXTRACT_DRY_RUN = 2 }; bool mzExtractRecursive(const ZipArchive *pArchive, const char *zipDir, const char *targetDir, - int flags, const struct utimbuf *timestamp, + const struct utimbuf *timestamp, void (*callback)(const char *fn, void*), void *cookie, struct selabel_handle *sehnd); -- cgit v1.1