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1295 lines
36 KiB
1295 lines
36 KiB
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Access to Zip archives.
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//
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#define LOG_TAG "zip"
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#include <androidfw/ZipUtils.h>
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#include <utils/Log.h>
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#include "ZipFile.h"
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#include <zlib.h>
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#define DEF_MEM_LEVEL 8 // normally in zutil.h?
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#include <memory.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <assert.h>
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using namespace android;
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/*
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* Some environments require the "b", some choke on it.
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*/
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#define FILE_OPEN_RO "rb"
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#define FILE_OPEN_RW "r+b"
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#define FILE_OPEN_RW_CREATE "w+b"
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/* should live somewhere else? */
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static status_t errnoToStatus(int err)
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{
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if (err == ENOENT)
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return NAME_NOT_FOUND;
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else if (err == EACCES)
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return PERMISSION_DENIED;
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else
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return UNKNOWN_ERROR;
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}
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/*
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* Open a file and parse its guts.
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*/
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status_t ZipFile::open(const char* zipFileName, int flags)
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{
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bool newArchive = false;
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assert(mZipFp == NULL); // no reopen
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if ((flags & kOpenTruncate))
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flags |= kOpenCreate; // trunc implies create
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if ((flags & kOpenReadOnly) && (flags & kOpenReadWrite))
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return INVALID_OPERATION; // not both
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if (!((flags & kOpenReadOnly) || (flags & kOpenReadWrite)))
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return INVALID_OPERATION; // not neither
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if ((flags & kOpenCreate) && !(flags & kOpenReadWrite))
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return INVALID_OPERATION; // create requires write
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if (flags & kOpenTruncate) {
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newArchive = true;
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} else {
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newArchive = (access(zipFileName, F_OK) != 0);
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if (!(flags & kOpenCreate) && newArchive) {
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/* not creating, must already exist */
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ALOGD("File %s does not exist", zipFileName);
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return NAME_NOT_FOUND;
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}
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}
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/* open the file */
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const char* openflags;
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if (flags & kOpenReadWrite) {
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if (newArchive)
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openflags = FILE_OPEN_RW_CREATE;
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else
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openflags = FILE_OPEN_RW;
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} else {
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openflags = FILE_OPEN_RO;
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}
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mZipFp = fopen(zipFileName, openflags);
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if (mZipFp == NULL) {
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int err = errno;
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ALOGD("fopen failed: %d\n", err);
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return errnoToStatus(err);
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}
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status_t result;
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if (!newArchive) {
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/*
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* Load the central directory. If that fails, then this probably
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* isn't a Zip archive.
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*/
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result = readCentralDir();
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} else {
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/*
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* Newly-created. The EndOfCentralDir constructor actually
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* sets everything to be the way we want it (all zeroes). We
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* set mNeedCDRewrite so that we create *something* if the
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* caller doesn't add any files. (We could also just unlink
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* the file if it's brand new and nothing was added, but that's
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* probably doing more than we really should -- the user might
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* have a need for empty zip files.)
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*/
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mNeedCDRewrite = true;
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result = NO_ERROR;
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}
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if (flags & kOpenReadOnly)
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mReadOnly = true;
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else
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assert(!mReadOnly);
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return result;
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}
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/*
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* Return the Nth entry in the archive.
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*/
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ZipEntry* ZipFile::getEntryByIndex(int idx) const
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{
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if (idx < 0 || idx >= (int) mEntries.size())
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return NULL;
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return mEntries[idx];
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}
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/*
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* Find an entry by name.
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*/
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ZipEntry* ZipFile::getEntryByName(const char* fileName) const
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{
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/*
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* Do a stupid linear string-compare search.
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*
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* There are various ways to speed this up, especially since it's rare
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* to intermingle changes to the archive with "get by name" calls. We
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* don't want to sort the mEntries vector itself, however, because
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* it's used to recreate the Central Directory.
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*
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* (Hash table works, parallel list of pointers in sorted order is good.)
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*/
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int idx;
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for (idx = mEntries.size()-1; idx >= 0; idx--) {
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ZipEntry* pEntry = mEntries[idx];
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if (!pEntry->getDeleted() &&
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strcmp(fileName, pEntry->getFileName()) == 0)
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{
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return pEntry;
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}
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}
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return NULL;
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}
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/*
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* Empty the mEntries vector.
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*/
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void ZipFile::discardEntries(void)
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{
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int count = mEntries.size();
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while (--count >= 0)
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delete mEntries[count];
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mEntries.clear();
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}
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/*
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* Find the central directory and read the contents.
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*
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* The fun thing about ZIP archives is that they may or may not be
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* readable from start to end. In some cases, notably for archives
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* that were written to stdout, the only length information is in the
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* central directory at the end of the file.
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*
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* Of course, the central directory can be followed by a variable-length
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* comment field, so we have to scan through it backwards. The comment
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* is at most 64K, plus we have 18 bytes for the end-of-central-dir stuff
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* itself, plus apparently sometimes people throw random junk on the end
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* just for the fun of it.
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*
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* This is all a little wobbly. If the wrong value ends up in the EOCD
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* area, we're hosed. This appears to be the way that everbody handles
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* it though, so we're in pretty good company if this fails.
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*/
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status_t ZipFile::readCentralDir(void)
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{
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status_t result = NO_ERROR;
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unsigned char* buf = NULL;
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off_t fileLength, seekStart;
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long readAmount;
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int i;
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fseek(mZipFp, 0, SEEK_END);
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fileLength = ftell(mZipFp);
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rewind(mZipFp);
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/* too small to be a ZIP archive? */
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if (fileLength < EndOfCentralDir::kEOCDLen) {
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ALOGD("Length is %ld -- too small\n", (long)fileLength);
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result = INVALID_OPERATION;
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goto bail;
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}
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buf = new unsigned char[EndOfCentralDir::kMaxEOCDSearch];
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if (buf == NULL) {
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ALOGD("Failure allocating %d bytes for EOCD search",
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EndOfCentralDir::kMaxEOCDSearch);
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result = NO_MEMORY;
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goto bail;
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}
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if (fileLength > EndOfCentralDir::kMaxEOCDSearch) {
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seekStart = fileLength - EndOfCentralDir::kMaxEOCDSearch;
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readAmount = EndOfCentralDir::kMaxEOCDSearch;
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} else {
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seekStart = 0;
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readAmount = (long) fileLength;
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}
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if (fseek(mZipFp, seekStart, SEEK_SET) != 0) {
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ALOGD("Failure seeking to end of zip at %ld", (long) seekStart);
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result = UNKNOWN_ERROR;
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goto bail;
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}
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/* read the last part of the file into the buffer */
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if (fread(buf, 1, readAmount, mZipFp) != (size_t) readAmount) {
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ALOGD("short file? wanted %ld\n", readAmount);
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result = UNKNOWN_ERROR;
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goto bail;
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}
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/* find the end-of-central-dir magic */
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for (i = readAmount - 4; i >= 0; i--) {
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if (buf[i] == 0x50 &&
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ZipEntry::getLongLE(&buf[i]) == EndOfCentralDir::kSignature)
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{
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ALOGV("+++ Found EOCD at buf+%d\n", i);
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break;
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}
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}
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if (i < 0) {
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ALOGD("EOCD not found, not Zip\n");
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result = INVALID_OPERATION;
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goto bail;
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}
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/* extract eocd values */
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result = mEOCD.readBuf(buf + i, readAmount - i);
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if (result != NO_ERROR) {
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ALOGD("Failure reading %ld bytes of EOCD values", readAmount - i);
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goto bail;
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}
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//mEOCD.dump();
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if (mEOCD.mDiskNumber != 0 || mEOCD.mDiskWithCentralDir != 0 ||
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mEOCD.mNumEntries != mEOCD.mTotalNumEntries)
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{
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ALOGD("Archive spanning not supported\n");
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result = INVALID_OPERATION;
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goto bail;
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}
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/*
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* So far so good. "mCentralDirSize" is the size in bytes of the
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* central directory, so we can just seek back that far to find it.
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* We can also seek forward mCentralDirOffset bytes from the
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* start of the file.
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*
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* We're not guaranteed to have the rest of the central dir in the
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* buffer, nor are we guaranteed that the central dir will have any
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* sort of convenient size. We need to skip to the start of it and
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* read the header, then the other goodies.
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*
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* The only thing we really need right now is the file comment, which
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* we're hoping to preserve.
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*/
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if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
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ALOGD("Failure seeking to central dir offset %ld\n",
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mEOCD.mCentralDirOffset);
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result = UNKNOWN_ERROR;
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goto bail;
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}
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/*
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* Loop through and read the central dir entries.
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*/
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ALOGV("Scanning %d entries...\n", mEOCD.mTotalNumEntries);
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int entry;
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for (entry = 0; entry < mEOCD.mTotalNumEntries; entry++) {
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ZipEntry* pEntry = new ZipEntry;
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result = pEntry->initFromCDE(mZipFp);
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if (result != NO_ERROR) {
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ALOGD("initFromCDE failed\n");
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delete pEntry;
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goto bail;
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}
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mEntries.add(pEntry);
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}
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/*
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* If all went well, we should now be back at the EOCD.
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*/
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{
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unsigned char checkBuf[4];
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if (fread(checkBuf, 1, 4, mZipFp) != 4) {
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ALOGD("EOCD check read failed\n");
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result = INVALID_OPERATION;
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goto bail;
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}
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if (ZipEntry::getLongLE(checkBuf) != EndOfCentralDir::kSignature) {
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ALOGD("EOCD read check failed\n");
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result = UNKNOWN_ERROR;
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goto bail;
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}
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ALOGV("+++ EOCD read check passed\n");
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}
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bail:
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delete[] buf;
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return result;
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}
|
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|
|
|
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/*
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* Add a new file to the archive.
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*
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* This requires creating and populating a ZipEntry structure, and copying
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* the data into the file at the appropriate position. The "appropriate
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* position" is the current location of the central directory, which we
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* casually overwrite (we can put it back later).
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*
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* If we were concerned about safety, we would want to make all changes
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* in a temp file and then overwrite the original after everything was
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* safely written. Not really a concern for us.
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*/
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status_t ZipFile::addCommon(const char* fileName, const void* data, size_t size,
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const char* storageName, int sourceType, int compressionMethod,
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ZipEntry** ppEntry)
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{
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ZipEntry* pEntry = NULL;
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status_t result = NO_ERROR;
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long lfhPosn, startPosn, endPosn, uncompressedLen;
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FILE* inputFp = NULL;
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unsigned long crc;
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time_t modWhen = 0;
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|
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if (mReadOnly)
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return INVALID_OPERATION;
|
|
|
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assert(compressionMethod == ZipEntry::kCompressDeflated ||
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compressionMethod == ZipEntry::kCompressStored);
|
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|
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/* make sure we're in a reasonable state */
|
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assert(mZipFp != NULL);
|
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assert(mEntries.size() == mEOCD.mTotalNumEntries);
|
|
|
|
/* make sure it doesn't already exist */
|
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if (getEntryByName(storageName) != NULL)
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return ALREADY_EXISTS;
|
|
|
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if (!data) {
|
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inputFp = fopen(fileName, FILE_OPEN_RO);
|
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if (inputFp == NULL)
|
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return errnoToStatus(errno);
|
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}
|
|
|
|
if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
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result = UNKNOWN_ERROR;
|
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goto bail;
|
|
}
|
|
|
|
pEntry = new ZipEntry;
|
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pEntry->initNew(storageName, NULL);
|
|
|
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/*
|
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* From here on out, failures are more interesting.
|
|
*/
|
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mNeedCDRewrite = true;
|
|
|
|
/*
|
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* Write the LFH, even though it's still mostly blank. We need it
|
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* as a place-holder. In theory the LFH isn't necessary, but in
|
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* practice some utilities demand it.
|
|
*/
|
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lfhPosn = ftell(mZipFp);
|
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pEntry->mLFH.write(mZipFp);
|
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startPosn = ftell(mZipFp);
|
|
|
|
/*
|
|
* Copy the data in, possibly compressing it as we go.
|
|
*/
|
|
if (sourceType == ZipEntry::kCompressStored) {
|
|
if (compressionMethod == ZipEntry::kCompressDeflated) {
|
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bool failed = false;
|
|
result = compressFpToFp(mZipFp, inputFp, data, size, &crc);
|
|
if (result != NO_ERROR) {
|
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ALOGD("compression failed, storing\n");
|
|
failed = true;
|
|
} else {
|
|
/*
|
|
* Make sure it has compressed "enough". This probably ought
|
|
* to be set through an API call, but I don't expect our
|
|
* criteria to change over time.
|
|
*/
|
|
long src = inputFp ? ftell(inputFp) : size;
|
|
long dst = ftell(mZipFp) - startPosn;
|
|
if (dst + (dst / 10) > src) {
|
|
ALOGD("insufficient compression (src=%ld dst=%ld), storing\n",
|
|
src, dst);
|
|
failed = true;
|
|
}
|
|
}
|
|
|
|
if (failed) {
|
|
compressionMethod = ZipEntry::kCompressStored;
|
|
if (inputFp) rewind(inputFp);
|
|
fseek(mZipFp, startPosn, SEEK_SET);
|
|
/* fall through to kCompressStored case */
|
|
}
|
|
}
|
|
/* handle "no compression" request, or failed compression from above */
|
|
if (compressionMethod == ZipEntry::kCompressStored) {
|
|
if (inputFp) {
|
|
result = copyFpToFp(mZipFp, inputFp, &crc);
|
|
} else {
|
|
result = copyDataToFp(mZipFp, data, size, &crc);
|
|
}
|
|
if (result != NO_ERROR) {
|
|
// don't need to truncate; happens in CDE rewrite
|
|
ALOGD("failed copying data in\n");
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
// currently seeked to end of file
|
|
uncompressedLen = inputFp ? ftell(inputFp) : size;
|
|
} else if (sourceType == ZipEntry::kCompressDeflated) {
|
|
/* we should support uncompressed-from-compressed, but it's not
|
|
* important right now */
|
|
assert(compressionMethod == ZipEntry::kCompressDeflated);
|
|
|
|
bool scanResult;
|
|
int method;
|
|
long compressedLen;
|
|
|
|
scanResult = ZipUtils::examineGzip(inputFp, &method, &uncompressedLen,
|
|
&compressedLen, &crc);
|
|
if (!scanResult || method != ZipEntry::kCompressDeflated) {
|
|
ALOGD("this isn't a deflated gzip file?");
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
|
|
result = copyPartialFpToFp(mZipFp, inputFp, compressedLen, NULL);
|
|
if (result != NO_ERROR) {
|
|
ALOGD("failed copying gzip data in\n");
|
|
goto bail;
|
|
}
|
|
} else {
|
|
assert(false);
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* We could write the "Data Descriptor", but there doesn't seem to
|
|
* be any point since we're going to go back and write the LFH.
|
|
*
|
|
* Update file offsets.
|
|
*/
|
|
endPosn = ftell(mZipFp); // seeked to end of compressed data
|
|
|
|
/*
|
|
* Success! Fill out new values.
|
|
*/
|
|
pEntry->setDataInfo(uncompressedLen, endPosn - startPosn, crc,
|
|
compressionMethod);
|
|
pEntry->setModWhen(modWhen);
|
|
pEntry->setLFHOffset(lfhPosn);
|
|
mEOCD.mNumEntries++;
|
|
mEOCD.mTotalNumEntries++;
|
|
mEOCD.mCentralDirSize = 0; // mark invalid; set by flush()
|
|
mEOCD.mCentralDirOffset = endPosn;
|
|
|
|
/*
|
|
* Go back and write the LFH.
|
|
*/
|
|
if (fseek(mZipFp, lfhPosn, SEEK_SET) != 0) {
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
pEntry->mLFH.write(mZipFp);
|
|
|
|
/*
|
|
* Add pEntry to the list.
|
|
*/
|
|
mEntries.add(pEntry);
|
|
if (ppEntry != NULL)
|
|
*ppEntry = pEntry;
|
|
pEntry = NULL;
|
|
|
|
bail:
|
|
if (inputFp != NULL)
|
|
fclose(inputFp);
|
|
delete pEntry;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Add an entry by copying it from another zip file. If "padding" is
|
|
* nonzero, the specified number of bytes will be added to the "extra"
|
|
* field in the header.
|
|
*
|
|
* If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
|
|
*/
|
|
status_t ZipFile::add(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry,
|
|
int padding, ZipEntry** ppEntry)
|
|
{
|
|
ZipEntry* pEntry = NULL;
|
|
status_t result;
|
|
long lfhPosn, endPosn;
|
|
|
|
if (mReadOnly)
|
|
return INVALID_OPERATION;
|
|
|
|
/* make sure we're in a reasonable state */
|
|
assert(mZipFp != NULL);
|
|
assert(mEntries.size() == mEOCD.mTotalNumEntries);
|
|
|
|
if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
|
|
pEntry = new ZipEntry;
|
|
if (pEntry == NULL) {
|
|
result = NO_MEMORY;
|
|
goto bail;
|
|
}
|
|
|
|
result = pEntry->initFromExternal(pSourceZip, pSourceEntry);
|
|
if (result != NO_ERROR)
|
|
goto bail;
|
|
if (padding != 0) {
|
|
result = pEntry->addPadding(padding);
|
|
if (result != NO_ERROR)
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* From here on out, failures are more interesting.
|
|
*/
|
|
mNeedCDRewrite = true;
|
|
|
|
/*
|
|
* Write the LFH. Since we're not recompressing the data, we already
|
|
* have all of the fields filled out.
|
|
*/
|
|
lfhPosn = ftell(mZipFp);
|
|
pEntry->mLFH.write(mZipFp);
|
|
|
|
/*
|
|
* Copy the data over.
|
|
*
|
|
* If the "has data descriptor" flag is set, we want to copy the DD
|
|
* fields as well. This is a fixed-size area immediately following
|
|
* the data.
|
|
*/
|
|
if (fseek(pSourceZip->mZipFp, pSourceEntry->getFileOffset(), SEEK_SET) != 0)
|
|
{
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
|
|
off_t copyLen;
|
|
copyLen = pSourceEntry->getCompressedLen();
|
|
if ((pSourceEntry->mLFH.mGPBitFlag & ZipEntry::kUsesDataDescr) != 0)
|
|
copyLen += ZipEntry::kDataDescriptorLen;
|
|
|
|
if (copyPartialFpToFp(mZipFp, pSourceZip->mZipFp, copyLen, NULL)
|
|
!= NO_ERROR)
|
|
{
|
|
ALOGW("copy of '%s' failed\n", pEntry->mCDE.mFileName);
|
|
result = UNKNOWN_ERROR;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Update file offsets.
|
|
*/
|
|
endPosn = ftell(mZipFp);
|
|
|
|
/*
|
|
* Success! Fill out new values.
|
|
*/
|
|
pEntry->setLFHOffset(lfhPosn); // sets mCDE.mLocalHeaderRelOffset
|
|
mEOCD.mNumEntries++;
|
|
mEOCD.mTotalNumEntries++;
|
|
mEOCD.mCentralDirSize = 0; // mark invalid; set by flush()
|
|
mEOCD.mCentralDirOffset = endPosn;
|
|
|
|
/*
|
|
* Add pEntry to the list.
|
|
*/
|
|
mEntries.add(pEntry);
|
|
if (ppEntry != NULL)
|
|
*ppEntry = pEntry;
|
|
pEntry = NULL;
|
|
|
|
result = NO_ERROR;
|
|
|
|
bail:
|
|
delete pEntry;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Copy all of the bytes in "src" to "dst".
|
|
*
|
|
* On exit, "srcFp" will be seeked to the end of the file, and "dstFp"
|
|
* will be seeked immediately past the data.
|
|
*/
|
|
status_t ZipFile::copyFpToFp(FILE* dstFp, FILE* srcFp, unsigned long* pCRC32)
|
|
{
|
|
unsigned char tmpBuf[32768];
|
|
size_t count;
|
|
|
|
*pCRC32 = crc32(0L, Z_NULL, 0);
|
|
|
|
while (1) {
|
|
count = fread(tmpBuf, 1, sizeof(tmpBuf), srcFp);
|
|
if (ferror(srcFp) || ferror(dstFp))
|
|
return errnoToStatus(errno);
|
|
if (count == 0)
|
|
break;
|
|
|
|
*pCRC32 = crc32(*pCRC32, tmpBuf, count);
|
|
|
|
if (fwrite(tmpBuf, 1, count, dstFp) != count) {
|
|
ALOGD("fwrite %d bytes failed\n", (int) count);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Copy all of the bytes in "src" to "dst".
|
|
*
|
|
* On exit, "dstFp" will be seeked immediately past the data.
|
|
*/
|
|
status_t ZipFile::copyDataToFp(FILE* dstFp,
|
|
const void* data, size_t size, unsigned long* pCRC32)
|
|
{
|
|
*pCRC32 = crc32(0L, Z_NULL, 0);
|
|
if (size > 0) {
|
|
*pCRC32 = crc32(*pCRC32, (const unsigned char*)data, size);
|
|
if (fwrite(data, 1, size, dstFp) != size) {
|
|
ALOGD("fwrite %d bytes failed\n", (int) size);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Copy some of the bytes in "src" to "dst".
|
|
*
|
|
* If "pCRC32" is NULL, the CRC will not be computed.
|
|
*
|
|
* On exit, "srcFp" will be seeked to the end of the file, and "dstFp"
|
|
* will be seeked immediately past the data just written.
|
|
*/
|
|
status_t ZipFile::copyPartialFpToFp(FILE* dstFp, FILE* srcFp, long length,
|
|
unsigned long* pCRC32)
|
|
{
|
|
unsigned char tmpBuf[32768];
|
|
size_t count;
|
|
|
|
if (pCRC32 != NULL)
|
|
*pCRC32 = crc32(0L, Z_NULL, 0);
|
|
|
|
while (length) {
|
|
long readSize;
|
|
|
|
readSize = sizeof(tmpBuf);
|
|
if (readSize > length)
|
|
readSize = length;
|
|
|
|
count = fread(tmpBuf, 1, readSize, srcFp);
|
|
if ((long) count != readSize) { // error or unexpected EOF
|
|
ALOGD("fread %d bytes failed\n", (int) readSize);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
if (pCRC32 != NULL)
|
|
*pCRC32 = crc32(*pCRC32, tmpBuf, count);
|
|
|
|
if (fwrite(tmpBuf, 1, count, dstFp) != count) {
|
|
ALOGD("fwrite %d bytes failed\n", (int) count);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
length -= readSize;
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Compress all of the data in "srcFp" and write it to "dstFp".
|
|
*
|
|
* On exit, "srcFp" will be seeked to the end of the file, and "dstFp"
|
|
* will be seeked immediately past the compressed data.
|
|
*/
|
|
status_t ZipFile::compressFpToFp(FILE* dstFp, FILE* srcFp,
|
|
const void* data, size_t size, unsigned long* pCRC32)
|
|
{
|
|
status_t result = NO_ERROR;
|
|
const size_t kBufSize = 32768;
|
|
unsigned char* inBuf = NULL;
|
|
unsigned char* outBuf = NULL;
|
|
z_stream zstream;
|
|
bool atEof = false; // no feof() aviailable yet
|
|
unsigned long crc;
|
|
int zerr;
|
|
|
|
/*
|
|
* Create an input buffer and an output buffer.
|
|
*/
|
|
inBuf = new unsigned char[kBufSize];
|
|
outBuf = new unsigned char[kBufSize];
|
|
if (inBuf == NULL || outBuf == NULL) {
|
|
result = NO_MEMORY;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Initialize the zlib stream.
|
|
*/
|
|
memset(&zstream, 0, sizeof(zstream));
|
|
zstream.zalloc = Z_NULL;
|
|
zstream.zfree = Z_NULL;
|
|
zstream.opaque = Z_NULL;
|
|
zstream.next_in = NULL;
|
|
zstream.avail_in = 0;
|
|
zstream.next_out = outBuf;
|
|
zstream.avail_out = kBufSize;
|
|
zstream.data_type = Z_UNKNOWN;
|
|
|
|
zerr = deflateInit2(&zstream, Z_BEST_COMPRESSION,
|
|
Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
|
|
if (zerr != Z_OK) {
|
|
result = UNKNOWN_ERROR;
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
ALOGE("Installed zlib is not compatible with linked version (%s)\n",
|
|
ZLIB_VERSION);
|
|
} else {
|
|
ALOGD("Call to deflateInit2 failed (zerr=%d)\n", zerr);
|
|
}
|
|
goto bail;
|
|
}
|
|
|
|
crc = crc32(0L, Z_NULL, 0);
|
|
|
|
/*
|
|
* Loop while we have data.
|
|
*/
|
|
do {
|
|
size_t getSize;
|
|
int flush;
|
|
|
|
/* only read if the input buffer is empty */
|
|
if (zstream.avail_in == 0 && !atEof) {
|
|
ALOGV("+++ reading %d bytes\n", (int)kBufSize);
|
|
if (data) {
|
|
getSize = size > kBufSize ? kBufSize : size;
|
|
memcpy(inBuf, data, getSize);
|
|
data = ((const char*)data) + getSize;
|
|
size -= getSize;
|
|
} else {
|
|
getSize = fread(inBuf, 1, kBufSize, srcFp);
|
|
if (ferror(srcFp)) {
|
|
ALOGD("deflate read failed (errno=%d)\n", errno);
|
|
goto z_bail;
|
|
}
|
|
}
|
|
if (getSize < kBufSize) {
|
|
ALOGV("+++ got %d bytes, EOF reached\n",
|
|
(int)getSize);
|
|
atEof = true;
|
|
}
|
|
|
|
crc = crc32(crc, inBuf, getSize);
|
|
|
|
zstream.next_in = inBuf;
|
|
zstream.avail_in = getSize;
|
|
}
|
|
|
|
if (atEof)
|
|
flush = Z_FINISH; /* tell zlib that we're done */
|
|
else
|
|
flush = Z_NO_FLUSH; /* more to come! */
|
|
|
|
zerr = deflate(&zstream, flush);
|
|
if (zerr != Z_OK && zerr != Z_STREAM_END) {
|
|
ALOGD("zlib deflate call failed (zerr=%d)\n", zerr);
|
|
result = UNKNOWN_ERROR;
|
|
goto z_bail;
|
|
}
|
|
|
|
/* write when we're full or when we're done */
|
|
if (zstream.avail_out == 0 ||
|
|
(zerr == Z_STREAM_END && zstream.avail_out != (uInt) kBufSize))
|
|
{
|
|
ALOGV("+++ writing %d bytes\n", (int) (zstream.next_out - outBuf));
|
|
if (fwrite(outBuf, 1, zstream.next_out - outBuf, dstFp) !=
|
|
(size_t)(zstream.next_out - outBuf))
|
|
{
|
|
ALOGD("write %d failed in deflate\n",
|
|
(int) (zstream.next_out - outBuf));
|
|
goto z_bail;
|
|
}
|
|
|
|
zstream.next_out = outBuf;
|
|
zstream.avail_out = kBufSize;
|
|
}
|
|
} while (zerr == Z_OK);
|
|
|
|
assert(zerr == Z_STREAM_END); /* other errors should've been caught */
|
|
|
|
*pCRC32 = crc;
|
|
|
|
z_bail:
|
|
deflateEnd(&zstream); /* free up any allocated structures */
|
|
|
|
bail:
|
|
delete[] inBuf;
|
|
delete[] outBuf;
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Mark an entry as deleted.
|
|
*
|
|
* We will eventually need to crunch the file down, but if several files
|
|
* are being removed (perhaps as part of an "update" process) we can make
|
|
* things considerably faster by deferring the removal to "flush" time.
|
|
*/
|
|
status_t ZipFile::remove(ZipEntry* pEntry)
|
|
{
|
|
/*
|
|
* Should verify that pEntry is actually part of this archive, and
|
|
* not some stray ZipEntry from a different file.
|
|
*/
|
|
|
|
/* mark entry as deleted, and mark archive as dirty */
|
|
pEntry->setDeleted();
|
|
mNeedCDRewrite = true;
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Flush any pending writes.
|
|
*
|
|
* In particular, this will crunch out deleted entries, and write the
|
|
* Central Directory and EOCD if we have stomped on them.
|
|
*/
|
|
status_t ZipFile::flush(void)
|
|
{
|
|
status_t result = NO_ERROR;
|
|
long eocdPosn;
|
|
int i, count;
|
|
|
|
if (mReadOnly)
|
|
return INVALID_OPERATION;
|
|
if (!mNeedCDRewrite)
|
|
return NO_ERROR;
|
|
|
|
assert(mZipFp != NULL);
|
|
|
|
result = crunchArchive();
|
|
if (result != NO_ERROR)
|
|
return result;
|
|
|
|
if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0)
|
|
return UNKNOWN_ERROR;
|
|
|
|
count = mEntries.size();
|
|
for (i = 0; i < count; i++) {
|
|
ZipEntry* pEntry = mEntries[i];
|
|
pEntry->mCDE.write(mZipFp);
|
|
}
|
|
|
|
eocdPosn = ftell(mZipFp);
|
|
mEOCD.mCentralDirSize = eocdPosn - mEOCD.mCentralDirOffset;
|
|
|
|
mEOCD.write(mZipFp);
|
|
|
|
/*
|
|
* If we had some stuff bloat up during compression and get replaced
|
|
* with plain files, or if we deleted some entries, there's a lot
|
|
* of wasted space at the end of the file. Remove it now.
|
|
*/
|
|
if (ftruncate(fileno(mZipFp), ftell(mZipFp)) != 0) {
|
|
ALOGW("ftruncate failed %ld: %s\n", ftell(mZipFp), strerror(errno));
|
|
// not fatal
|
|
}
|
|
|
|
/* should we clear the "newly added" flag in all entries now? */
|
|
|
|
mNeedCDRewrite = false;
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Crunch deleted files out of an archive by shifting the later files down.
|
|
*
|
|
* Because we're not using a temp file, we do the operation inside the
|
|
* current file.
|
|
*/
|
|
status_t ZipFile::crunchArchive(void)
|
|
{
|
|
status_t result = NO_ERROR;
|
|
int i, count;
|
|
long delCount, adjust;
|
|
|
|
#if 0
|
|
printf("CONTENTS:\n");
|
|
for (i = 0; i < (int) mEntries.size(); i++) {
|
|
printf(" %d: lfhOff=%ld del=%d\n",
|
|
i, mEntries[i]->getLFHOffset(), mEntries[i]->getDeleted());
|
|
}
|
|
printf(" END is %ld\n", (long) mEOCD.mCentralDirOffset);
|
|
#endif
|
|
|
|
/*
|
|
* Roll through the set of files, shifting them as appropriate. We
|
|
* could probably get a slight performance improvement by sliding
|
|
* multiple files down at once (because we could use larger reads
|
|
* when operating on batches of small files), but it's not that useful.
|
|
*/
|
|
count = mEntries.size();
|
|
delCount = adjust = 0;
|
|
for (i = 0; i < count; i++) {
|
|
ZipEntry* pEntry = mEntries[i];
|
|
long span;
|
|
|
|
if (pEntry->getLFHOffset() != 0) {
|
|
long nextOffset;
|
|
|
|
/* Get the length of this entry by finding the offset
|
|
* of the next entry. Directory entries don't have
|
|
* file offsets, so we need to find the next non-directory
|
|
* entry.
|
|
*/
|
|
nextOffset = 0;
|
|
for (int ii = i+1; nextOffset == 0 && ii < count; ii++)
|
|
nextOffset = mEntries[ii]->getLFHOffset();
|
|
if (nextOffset == 0)
|
|
nextOffset = mEOCD.mCentralDirOffset;
|
|
span = nextOffset - pEntry->getLFHOffset();
|
|
|
|
assert(span >= ZipEntry::LocalFileHeader::kLFHLen);
|
|
} else {
|
|
/* This is a directory entry. It doesn't have
|
|
* any actual file contents, so there's no need to
|
|
* move anything.
|
|
*/
|
|
span = 0;
|
|
}
|
|
|
|
//printf("+++ %d: off=%ld span=%ld del=%d [count=%d]\n",
|
|
// i, pEntry->getLFHOffset(), span, pEntry->getDeleted(), count);
|
|
|
|
if (pEntry->getDeleted()) {
|
|
adjust += span;
|
|
delCount++;
|
|
|
|
delete pEntry;
|
|
mEntries.removeAt(i);
|
|
|
|
/* adjust loop control */
|
|
count--;
|
|
i--;
|
|
} else if (span != 0 && adjust > 0) {
|
|
/* shuffle this entry back */
|
|
//printf("+++ Shuffling '%s' back %ld\n",
|
|
// pEntry->getFileName(), adjust);
|
|
result = filemove(mZipFp, pEntry->getLFHOffset() - adjust,
|
|
pEntry->getLFHOffset(), span);
|
|
if (result != NO_ERROR) {
|
|
/* this is why you use a temp file */
|
|
ALOGE("error during crunch - archive is toast\n");
|
|
return result;
|
|
}
|
|
|
|
pEntry->setLFHOffset(pEntry->getLFHOffset() - adjust);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fix EOCD info. We have to wait until the end to do some of this
|
|
* because we use mCentralDirOffset to determine "span" for the
|
|
* last entry.
|
|
*/
|
|
mEOCD.mCentralDirOffset -= adjust;
|
|
mEOCD.mNumEntries -= delCount;
|
|
mEOCD.mTotalNumEntries -= delCount;
|
|
mEOCD.mCentralDirSize = 0; // mark invalid; set by flush()
|
|
|
|
assert(mEOCD.mNumEntries == mEOCD.mTotalNumEntries);
|
|
assert(mEOCD.mNumEntries == count);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Works like memmove(), but on pieces of a file.
|
|
*/
|
|
status_t ZipFile::filemove(FILE* fp, off_t dst, off_t src, size_t n)
|
|
{
|
|
if (dst == src || n <= 0)
|
|
return NO_ERROR;
|
|
|
|
unsigned char readBuf[32768];
|
|
|
|
if (dst < src) {
|
|
/* shift stuff toward start of file; must read from start */
|
|
while (n != 0) {
|
|
size_t getSize = sizeof(readBuf);
|
|
if (getSize > n)
|
|
getSize = n;
|
|
|
|
if (fseek(fp, (long) src, SEEK_SET) != 0) {
|
|
ALOGD("filemove src seek %ld failed\n", (long) src);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
if (fread(readBuf, 1, getSize, fp) != getSize) {
|
|
ALOGD("filemove read %ld off=%ld failed\n",
|
|
(long) getSize, (long) src);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
if (fseek(fp, (long) dst, SEEK_SET) != 0) {
|
|
ALOGD("filemove dst seek %ld failed\n", (long) dst);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
if (fwrite(readBuf, 1, getSize, fp) != getSize) {
|
|
ALOGD("filemove write %ld off=%ld failed\n",
|
|
(long) getSize, (long) dst);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
src += getSize;
|
|
dst += getSize;
|
|
n -= getSize;
|
|
}
|
|
} else {
|
|
/* shift stuff toward end of file; must read from end */
|
|
assert(false); // write this someday, maybe
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get the modification time from a file descriptor.
|
|
*/
|
|
time_t ZipFile::getModTime(int fd)
|
|
{
|
|
struct stat sb;
|
|
|
|
if (fstat(fd, &sb) < 0) {
|
|
ALOGD("HEY: fstat on fd %d failed\n", fd);
|
|
return (time_t) -1;
|
|
}
|
|
|
|
return sb.st_mtime;
|
|
}
|
|
|
|
|
|
#if 0 /* this is a bad idea */
|
|
/*
|
|
* Get a copy of the Zip file descriptor.
|
|
*
|
|
* We don't allow this if the file was opened read-write because we tend
|
|
* to leave the file contents in an uncertain state between calls to
|
|
* flush(). The duplicated file descriptor should only be valid for reads.
|
|
*/
|
|
int ZipFile::getZipFd(void) const
|
|
{
|
|
if (!mReadOnly)
|
|
return INVALID_OPERATION;
|
|
assert(mZipFp != NULL);
|
|
|
|
int fd;
|
|
fd = dup(fileno(mZipFp));
|
|
if (fd < 0) {
|
|
ALOGD("didn't work, errno=%d\n", errno);
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
#endif
|
|
|
|
|
|
#if 0
|
|
/*
|
|
* Expand data.
|
|
*/
|
|
bool ZipFile::uncompress(const ZipEntry* pEntry, void* buf) const
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
// free the memory when you're done
|
|
void* ZipFile::uncompress(const ZipEntry* entry)
|
|
{
|
|
size_t unlen = entry->getUncompressedLen();
|
|
size_t clen = entry->getCompressedLen();
|
|
|
|
void* buf = malloc(unlen);
|
|
if (buf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
fseek(mZipFp, 0, SEEK_SET);
|
|
|
|
off_t offset = entry->getFileOffset();
|
|
if (fseek(mZipFp, offset, SEEK_SET) != 0) {
|
|
goto bail;
|
|
}
|
|
|
|
switch (entry->getCompressionMethod())
|
|
{
|
|
case ZipEntry::kCompressStored: {
|
|
ssize_t amt = fread(buf, 1, unlen, mZipFp);
|
|
if (amt != (ssize_t)unlen) {
|
|
goto bail;
|
|
}
|
|
#if 0
|
|
printf("data...\n");
|
|
const unsigned char* p = (unsigned char*)buf;
|
|
const unsigned char* end = p+unlen;
|
|
for (int i=0; i<32 && p < end; i++) {
|
|
printf("0x%08x ", (int)(offset+(i*0x10)));
|
|
for (int j=0; j<0x10 && p < end; j++) {
|
|
printf(" %02x", *p);
|
|
p++;
|
|
}
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
}
|
|
break;
|
|
case ZipEntry::kCompressDeflated: {
|
|
if (!ZipUtils::inflateToBuffer(mZipFp, buf, unlen, clen)) {
|
|
goto bail;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
goto bail;
|
|
}
|
|
return buf;
|
|
|
|
bail:
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* ===========================================================================
|
|
* ZipFile::EndOfCentralDir
|
|
* ===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Read the end-of-central-dir fields.
|
|
*
|
|
* "buf" should be positioned at the EOCD signature, and should contain
|
|
* the entire EOCD area including the comment.
|
|
*/
|
|
status_t ZipFile::EndOfCentralDir::readBuf(const unsigned char* buf, int len)
|
|
{
|
|
/* don't allow re-use */
|
|
assert(mComment == NULL);
|
|
|
|
if (len < kEOCDLen) {
|
|
/* looks like ZIP file got truncated */
|
|
ALOGD(" Zip EOCD: expected >= %d bytes, found %d\n",
|
|
kEOCDLen, len);
|
|
return INVALID_OPERATION;
|
|
}
|
|
|
|
/* this should probably be an assert() */
|
|
if (ZipEntry::getLongLE(&buf[0x00]) != kSignature)
|
|
return UNKNOWN_ERROR;
|
|
|
|
mDiskNumber = ZipEntry::getShortLE(&buf[0x04]);
|
|
mDiskWithCentralDir = ZipEntry::getShortLE(&buf[0x06]);
|
|
mNumEntries = ZipEntry::getShortLE(&buf[0x08]);
|
|
mTotalNumEntries = ZipEntry::getShortLE(&buf[0x0a]);
|
|
mCentralDirSize = ZipEntry::getLongLE(&buf[0x0c]);
|
|
mCentralDirOffset = ZipEntry::getLongLE(&buf[0x10]);
|
|
mCommentLen = ZipEntry::getShortLE(&buf[0x14]);
|
|
|
|
// TODO: validate mCentralDirOffset
|
|
|
|
if (mCommentLen > 0) {
|
|
if (kEOCDLen + mCommentLen > len) {
|
|
ALOGD("EOCD(%d) + comment(%d) exceeds len (%d)\n",
|
|
kEOCDLen, mCommentLen, len);
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
mComment = new unsigned char[mCommentLen];
|
|
memcpy(mComment, buf + kEOCDLen, mCommentLen);
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Write an end-of-central-directory section.
|
|
*/
|
|
status_t ZipFile::EndOfCentralDir::write(FILE* fp)
|
|
{
|
|
unsigned char buf[kEOCDLen];
|
|
|
|
ZipEntry::putLongLE(&buf[0x00], kSignature);
|
|
ZipEntry::putShortLE(&buf[0x04], mDiskNumber);
|
|
ZipEntry::putShortLE(&buf[0x06], mDiskWithCentralDir);
|
|
ZipEntry::putShortLE(&buf[0x08], mNumEntries);
|
|
ZipEntry::putShortLE(&buf[0x0a], mTotalNumEntries);
|
|
ZipEntry::putLongLE(&buf[0x0c], mCentralDirSize);
|
|
ZipEntry::putLongLE(&buf[0x10], mCentralDirOffset);
|
|
ZipEntry::putShortLE(&buf[0x14], mCommentLen);
|
|
|
|
if (fwrite(buf, 1, kEOCDLen, fp) != kEOCDLen)
|
|
return UNKNOWN_ERROR;
|
|
if (mCommentLen > 0) {
|
|
assert(mComment != NULL);
|
|
if (fwrite(mComment, mCommentLen, 1, fp) != mCommentLen)
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Dump the contents of an EndOfCentralDir object.
|
|
*/
|
|
void ZipFile::EndOfCentralDir::dump(void) const
|
|
{
|
|
ALOGD(" EndOfCentralDir contents:\n");
|
|
ALOGD(" diskNum=%u diskWCD=%u numEnt=%u totalNumEnt=%u\n",
|
|
mDiskNumber, mDiskWithCentralDir, mNumEntries, mTotalNumEntries);
|
|
ALOGD(" centDirSize=%lu centDirOff=%lu commentLen=%u\n",
|
|
mCentralDirSize, mCentralDirOffset, mCommentLen);
|
|
}
|
|
|