Kang in older minzip for building in CM9 & CM7
CM7 and CM9 do not have libselinux needed in the newer minzip.
diff --git a/minzipold/Zip.c b/minzipold/Zip.c
new file mode 100644
index 0000000..54d5d55
--- /dev/null
+++ b/minzipold/Zip.c
@@ -0,0 +1,1168 @@
+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Simple Zip file support.
+ */
+#include "safe_iop.h"
+#include "zlib.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdint.h> // for uintptr_t
+#include <stdlib.h>
+#include <sys/stat.h> // for S_ISLNK()
+#include <unistd.h>
+
+#define LOG_TAG "minzip"
+#include "Zip.h"
+#include "Bits.h"
+#include "Log.h"
+#include "DirUtil.h"
+
+#undef NDEBUG // do this after including Log.h
+#include <assert.h>
+
+#define SORT_ENTRIES 1
+
+/*
+ * Offset and length constants (java.util.zip naming convention).
+ */
+enum {
+ CENSIG = 0x02014b50, // PK12
+ CENHDR = 46,
+
+ CENVEM = 4,
+ CENVER = 6,
+ CENFLG = 8,
+ CENHOW = 10,
+ CENTIM = 12,
+ CENCRC = 16,
+ CENSIZ = 20,
+ CENLEN = 24,
+ CENNAM = 28,
+ CENEXT = 30,
+ CENCOM = 32,
+ CENDSK = 34,
+ CENATT = 36,
+ CENATX = 38,
+ CENOFF = 42,
+
+ ENDSIG = 0x06054b50, // PK56
+ ENDHDR = 22,
+
+ ENDSUB = 8,
+ ENDTOT = 10,
+ ENDSIZ = 12,
+ ENDOFF = 16,
+ ENDCOM = 20,
+
+ EXTSIG = 0x08074b50, // PK78
+ EXTHDR = 16,
+
+ EXTCRC = 4,
+ EXTSIZ = 8,
+ EXTLEN = 12,
+
+ LOCSIG = 0x04034b50, // PK34
+ LOCHDR = 30,
+
+ LOCVER = 4,
+ LOCFLG = 6,
+ LOCHOW = 8,
+ LOCTIM = 10,
+ LOCCRC = 14,
+ LOCSIZ = 18,
+ LOCLEN = 22,
+ LOCNAM = 26,
+ LOCEXT = 28,
+
+ STORED = 0,
+ DEFLATED = 8,
+
+ CENVEM_UNIX = 3 << 8, // the high byte of CENVEM
+};
+
+
+/*
+ * For debugging, dump the contents of a ZipEntry.
+ */
+#if 0
+static void dumpEntry(const ZipEntry* pEntry)
+{
+ LOGI(" %p '%.*s'\n", pEntry->fileName,pEntry->fileNameLen,pEntry->fileName);
+ LOGI(" off=%ld comp=%ld uncomp=%ld how=%d\n", pEntry->offset,
+ pEntry->compLen, pEntry->uncompLen, pEntry->compression);
+}
+#endif
+
+/*
+ * (This is a mzHashTableLookup callback.)
+ *
+ * Compare two ZipEntry structs, by name.
+ */
+static int hashcmpZipEntry(const void* ventry1, const void* ventry2)
+{
+ const ZipEntry* entry1 = (const ZipEntry*) ventry1;
+ const ZipEntry* entry2 = (const ZipEntry*) ventry2;
+
+ if (entry1->fileNameLen != entry2->fileNameLen)
+ return entry1->fileNameLen - entry2->fileNameLen;
+ return memcmp(entry1->fileName, entry2->fileName, entry1->fileNameLen);
+}
+
+/*
+ * (This is a mzHashTableLookup callback.)
+ *
+ * find a ZipEntry struct by name.
+ */
+static int hashcmpZipName(const void* ventry, const void* vname)
+{
+ const ZipEntry* entry = (const ZipEntry*) ventry;
+ const char* name = (const char*) vname;
+ unsigned int nameLen = strlen(name);
+
+ if (entry->fileNameLen != nameLen)
+ return entry->fileNameLen - nameLen;
+ return memcmp(entry->fileName, name, nameLen);
+}
+
+/*
+ * Compute the hash code for a ZipEntry filename.
+ *
+ * Not expected to be compatible with any other hash function, so we init
+ * to 2 to ensure it doesn't happen to match.
+ */
+static unsigned int computeHash(const char* name, int nameLen)
+{
+ unsigned int hash = 2;
+
+ while (nameLen--)
+ hash = hash * 31 + *name++;
+
+ return hash;
+}
+
+static void addEntryToHashTable(HashTable* pHash, ZipEntry* pEntry)
+{
+ unsigned int itemHash = computeHash(pEntry->fileName, pEntry->fileNameLen);
+ const ZipEntry* found;
+
+ found = (const ZipEntry*)mzHashTableLookup(pHash,
+ itemHash, pEntry, hashcmpZipEntry, true);
+ if (found != pEntry) {
+ LOGW("WARNING: duplicate entry '%.*s' in Zip\n",
+ found->fileNameLen, found->fileName);
+ /* keep going */
+ }
+}
+
+static int validFilename(const char *fileName, unsigned int fileNameLen)
+{
+ // Forbid super long filenames.
+ if (fileNameLen >= PATH_MAX) {
+ LOGW("Filename too long (%d chatacters)\n", fileNameLen);
+ return 0;
+ }
+
+ // Require all characters to be printable ASCII (no NUL, no UTF-8, etc).
+ unsigned int i;
+ for (i = 0; i < fileNameLen; ++i) {
+ if (fileName[i] < 32 || fileName[i] >= 127) {
+ LOGW("Filename contains invalid character '\%03o'\n", fileName[i]);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Parse the contents of a Zip archive. After confirming that the file
+ * is in fact a Zip, we scan out the contents of the central directory and
+ * store it in a hash table.
+ *
+ * Returns "true" on success.
+ */
+static bool parseZipArchive(ZipArchive* pArchive, const MemMapping* pMap)
+{
+ bool result = false;
+ const unsigned char* ptr;
+ unsigned int i, numEntries, cdOffset;
+ unsigned int val;
+
+ /*
+ * The first 4 bytes of the file will either be the local header
+ * signature for the first file (LOCSIG) or, if the archive doesn't
+ * have any files in it, the end-of-central-directory signature (ENDSIG).
+ */
+ val = get4LE(pMap->addr);
+ if (val == ENDSIG) {
+ LOGI("Found Zip archive, but it looks empty\n");
+ goto bail;
+ } else if (val != LOCSIG) {
+ LOGV("Not a Zip archive (found 0x%08x)\n", val);
+ goto bail;
+ }
+
+ /*
+ * Find the EOCD. We'll find it immediately unless they have a file
+ * comment.
+ */
+ ptr = pMap->addr + pMap->length - ENDHDR;
+
+ while (ptr >= (const unsigned char*) pMap->addr) {
+ if (*ptr == (ENDSIG & 0xff) && get4LE(ptr) == ENDSIG)
+ break;
+ ptr--;
+ }
+ if (ptr < (const unsigned char*) pMap->addr) {
+ LOGI("Could not find end-of-central-directory in Zip\n");
+ goto bail;
+ }
+
+ /*
+ * There are two interesting items in the EOCD block: the number of
+ * entries in the file, and the file offset of the start of the
+ * central directory.
+ */
+ numEntries = get2LE(ptr + ENDSUB);
+ cdOffset = get4LE(ptr + ENDOFF);
+
+ LOGVV("numEntries=%d cdOffset=%d\n", numEntries, cdOffset);
+ if (numEntries == 0 || cdOffset >= pMap->length) {
+ LOGW("Invalid entries=%d offset=%d (len=%zd)\n",
+ numEntries, cdOffset, pMap->length);
+ goto bail;
+ }
+
+ /*
+ * Create data structures to hold entries.
+ */
+ pArchive->numEntries = numEntries;
+ pArchive->pEntries = (ZipEntry*) calloc(numEntries, sizeof(ZipEntry));
+ pArchive->pHash = mzHashTableCreate(mzHashSize(numEntries), NULL);
+ if (pArchive->pEntries == NULL || pArchive->pHash == NULL)
+ goto bail;
+
+ ptr = pMap->addr + cdOffset;
+ for (i = 0; i < numEntries; i++) {
+ ZipEntry* pEntry;
+ unsigned int fileNameLen, extraLen, commentLen, localHdrOffset;
+ const unsigned char* localHdr;
+ const char *fileName;
+
+ if (ptr + CENHDR > (const unsigned char*)pMap->addr + pMap->length) {
+ LOGW("Ran off the end (at %d)\n", i);
+ goto bail;
+ }
+ if (get4LE(ptr) != CENSIG) {
+ LOGW("Missed a central dir sig (at %d)\n", i);
+ goto bail;
+ }
+
+ localHdrOffset = get4LE(ptr + CENOFF);
+ fileNameLen = get2LE(ptr + CENNAM);
+ extraLen = get2LE(ptr + CENEXT);
+ commentLen = get2LE(ptr + CENCOM);
+ fileName = (const char*)ptr + CENHDR;
+ if (fileName + fileNameLen > (const char*)pMap->addr + pMap->length) {
+ LOGW("Filename ran off the end (at %d)\n", i);
+ goto bail;
+ }
+ if (!validFilename(fileName, fileNameLen)) {
+ LOGW("Invalid filename (at %d)\n", i);
+ goto bail;
+ }
+
+#if SORT_ENTRIES
+ /* Figure out where this entry should go (binary search).
+ */
+ if (i > 0) {
+ int low, high;
+
+ low = 0;
+ high = i - 1;
+ while (low <= high) {
+ int mid;
+ int diff;
+ int diffLen;
+
+ mid = low + ((high - low) / 2); // avoid overflow
+
+ if (pArchive->pEntries[mid].fileNameLen < fileNameLen) {
+ diffLen = pArchive->pEntries[mid].fileNameLen;
+ } else {
+ diffLen = fileNameLen;
+ }
+ diff = strncmp(pArchive->pEntries[mid].fileName, fileName,
+ diffLen);
+ if (diff == 0) {
+ diff = pArchive->pEntries[mid].fileNameLen - fileNameLen;
+ }
+ if (diff < 0) {
+ low = mid + 1;
+ } else if (diff > 0) {
+ high = mid - 1;
+ } else {
+ high = mid;
+ break;
+ }
+ }
+
+ unsigned int target = high + 1;
+ assert(target <= i);
+ if (target != i) {
+ /* It belongs somewhere other than at the end of
+ * the list. Make some room at [target].
+ */
+ memmove(pArchive->pEntries + target + 1,
+ pArchive->pEntries + target,
+ (i - target) * sizeof(ZipEntry));
+ }
+ pEntry = &pArchive->pEntries[target];
+ } else {
+ pEntry = &pArchive->pEntries[0];
+ }
+#else
+ pEntry = &pArchive->pEntries[i];
+#endif
+
+ //LOGI("%d: localHdr=%d fnl=%d el=%d cl=%d\n",
+ // i, localHdrOffset, fileNameLen, extraLen, commentLen);
+
+ pEntry->fileNameLen = fileNameLen;
+ pEntry->fileName = fileName;
+
+ pEntry->compLen = get4LE(ptr + CENSIZ);
+ pEntry->uncompLen = get4LE(ptr + CENLEN);
+ pEntry->compression = get2LE(ptr + CENHOW);
+ pEntry->modTime = get4LE(ptr + CENTIM);
+ pEntry->crc32 = get4LE(ptr + CENCRC);
+
+ /* These two are necessary for finding the mode of the file.
+ */
+ pEntry->versionMadeBy = get2LE(ptr + CENVEM);
+ if ((pEntry->versionMadeBy & 0xff00) != 0 &&
+ (pEntry->versionMadeBy & 0xff00) != CENVEM_UNIX)
+ {
+ LOGW("Incompatible \"version made by\": 0x%02x (at %d)\n",
+ pEntry->versionMadeBy >> 8, i);
+ goto bail;
+ }
+ pEntry->externalFileAttributes = get4LE(ptr + CENATX);
+
+ // Perform pMap->addr + localHdrOffset, ensuring that it won't
+ // overflow. This is needed because localHdrOffset is untrusted.
+ if (!safe_add((uintptr_t *)&localHdr, (uintptr_t)pMap->addr,
+ (uintptr_t)localHdrOffset)) {
+ LOGW("Integer overflow adding in parseZipArchive\n");
+ goto bail;
+ }
+ if ((uintptr_t)localHdr + LOCHDR >
+ (uintptr_t)pMap->addr + pMap->length) {
+ LOGW("Bad offset to local header: %d (at %d)\n", localHdrOffset, i);
+ goto bail;
+ }
+ if (get4LE(localHdr) != LOCSIG) {
+ LOGW("Missed a local header sig (at %d)\n", i);
+ goto bail;
+ }
+ pEntry->offset = localHdrOffset + LOCHDR
+ + get2LE(localHdr + LOCNAM) + get2LE(localHdr + LOCEXT);
+ if (!safe_add(NULL, pEntry->offset, pEntry->compLen)) {
+ LOGW("Integer overflow adding in parseZipArchive\n");
+ goto bail;
+ }
+ if ((size_t)pEntry->offset + pEntry->compLen > pMap->length) {
+ LOGW("Data ran off the end (at %d)\n", i);
+ goto bail;
+ }
+
+#if !SORT_ENTRIES
+ /* Add to hash table; no need to lock here.
+ * Can't do this now if we're sorting, because entries
+ * will move around.
+ */
+ addEntryToHashTable(pArchive->pHash, pEntry);
+#endif
+
+ //dumpEntry(pEntry);
+ ptr += CENHDR + fileNameLen + extraLen + commentLen;
+ }
+
+#if SORT_ENTRIES
+ /* If we're sorting, we have to wait until all entries
+ * are in their final places, otherwise the pointers will
+ * probably point to the wrong things.
+ */
+ for (i = 0; i < numEntries; i++) {
+ /* Add to hash table; no need to lock here.
+ */
+ addEntryToHashTable(pArchive->pHash, &pArchive->pEntries[i]);
+ }
+#endif
+
+ result = true;
+
+bail:
+ if (!result) {
+ mzHashTableFree(pArchive->pHash);
+ pArchive->pHash = NULL;
+ }
+ return result;
+}
+
+/*
+ * Open a Zip archive and scan out the contents.
+ *
+ * The easiest way to do this is to mmap() the whole thing and do the
+ * traditional backward scan for central directory. Since the EOCD is
+ * a relatively small bit at the end, we should end up only touching a
+ * small set of pages.
+ *
+ * This will be called on non-Zip files, especially during startup, so
+ * we don't want to be too noisy about failures. (Do we want a "quiet"
+ * flag?)
+ *
+ * On success, we fill out the contents of "pArchive".
+ */
+int mzOpenZipArchive(const char* fileName, ZipArchive* pArchive)
+{
+ MemMapping map;
+ int err;
+
+ LOGV("Opening archive '%s' %p\n", fileName, pArchive);
+
+ map.addr = NULL;
+ memset(pArchive, 0, sizeof(*pArchive));
+
+ pArchive->fd = open(fileName, O_RDONLY, 0);
+ if (pArchive->fd < 0) {
+ err = errno ? errno : -1;
+ LOGV("Unable to open '%s': %s\n", fileName, strerror(err));
+ goto bail;
+ }
+
+ if (sysMapFileInShmem(pArchive->fd, &map) != 0) {
+ err = -1;
+ LOGW("Map of '%s' failed\n", fileName);
+ goto bail;
+ }
+
+ if (map.length < ENDHDR) {
+ err = -1;
+ LOGV("File '%s' too small to be zip (%zd)\n", fileName, map.length);
+ goto bail;
+ }
+
+ if (!parseZipArchive(pArchive, &map)) {
+ err = -1;
+ LOGV("Parsing '%s' failed\n", fileName);
+ goto bail;
+ }
+
+ err = 0;
+ sysCopyMap(&pArchive->map, &map);
+ map.addr = NULL;
+
+bail:
+ if (err != 0)
+ mzCloseZipArchive(pArchive);
+ if (map.addr != NULL)
+ sysReleaseShmem(&map);
+ return err;
+}
+
+/*
+ * Close a ZipArchive, closing the file and freeing the contents.
+ *
+ * NOTE: the ZipArchive may not have been fully created.
+ */
+void mzCloseZipArchive(ZipArchive* pArchive)
+{
+ LOGV("Closing archive %p\n", pArchive);
+
+ if (pArchive->fd >= 0)
+ close(pArchive->fd);
+ if (pArchive->map.addr != NULL)
+ sysReleaseShmem(&pArchive->map);
+
+ free(pArchive->pEntries);
+
+ mzHashTableFree(pArchive->pHash);
+
+ pArchive->fd = -1;
+ pArchive->pHash = NULL;
+ pArchive->pEntries = NULL;
+}
+
+/*
+ * Find a matching entry.
+ *
+ * Returns NULL if no matching entry found.
+ */
+const ZipEntry* mzFindZipEntry(const ZipArchive* pArchive,
+ const char* entryName)
+{
+ unsigned int itemHash = computeHash(entryName, strlen(entryName));
+
+ return (const ZipEntry*)mzHashTableLookup(pArchive->pHash,
+ itemHash, (char*) entryName, hashcmpZipName, false);
+}
+
+/*
+ * Return true if the entry is a symbolic link.
+ */
+bool mzIsZipEntrySymlink(const ZipEntry* pEntry)
+{
+ if ((pEntry->versionMadeBy & 0xff00) == CENVEM_UNIX) {
+ return S_ISLNK(pEntry->externalFileAttributes >> 16);
+ }
+ return false;
+}
+
+/* Call processFunction on the uncompressed data of a STORED entry.
+ */
+static bool processStoredEntry(const ZipArchive *pArchive,
+ const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
+ void *cookie)
+{
+ size_t bytesLeft = pEntry->compLen;
+ while (bytesLeft > 0) {
+ unsigned char buf[32 * 1024];
+ ssize_t n;
+ size_t count;
+ bool ret;
+
+ count = bytesLeft;
+ if (count > sizeof(buf)) {
+ count = sizeof(buf);
+ }
+ n = read(pArchive->fd, buf, count);
+ if (n < 0 || (size_t)n != count) {
+ LOGE("Can't read %zu bytes from zip file: %ld\n", count, n);
+ return false;
+ }
+ ret = processFunction(buf, n, cookie);
+ if (!ret) {
+ return false;
+ }
+ bytesLeft -= count;
+ }
+ return true;
+}
+
+static bool processDeflatedEntry(const ZipArchive *pArchive,
+ const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
+ void *cookie)
+{
+ long result = -1;
+ unsigned char readBuf[32 * 1024];
+ unsigned char procBuf[32 * 1024];
+ z_stream zstream;
+ int zerr;
+ long compRemaining;
+
+ compRemaining = pEntry->compLen;
+
+ /*
+ * 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 = (Bytef*) procBuf;
+ zstream.avail_out = sizeof(procBuf);
+ zstream.data_type = Z_UNKNOWN;
+
+ /*
+ * Use the undocumented "negative window bits" feature to tell zlib
+ * that there's no zlib header waiting for it.
+ */
+ zerr = inflateInit2(&zstream, -MAX_WBITS);
+ if (zerr != Z_OK) {
+ if (zerr == Z_VERSION_ERROR) {
+ LOGE("Installed zlib is not compatible with linked version (%s)\n",
+ ZLIB_VERSION);
+ } else {
+ LOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr);
+ }
+ goto bail;
+ }
+
+ /*
+ * Loop while we have data.
+ */
+ do {
+ /* read as much as we can */
+ if (zstream.avail_in == 0) {
+ long getSize = (compRemaining > (long)sizeof(readBuf)) ?
+ (long)sizeof(readBuf) : compRemaining;
+ LOGVV("+++ reading %ld bytes (%ld left)\n",
+ getSize, compRemaining);
+
+ int cc = read(pArchive->fd, readBuf, getSize);
+ if (cc != (int) getSize) {
+ LOGW("inflate read failed (%d vs %ld)\n", cc, getSize);
+ goto z_bail;
+ }
+
+ compRemaining -= getSize;
+
+ zstream.next_in = readBuf;
+ zstream.avail_in = getSize;
+ }
+
+ /* uncompress the data */
+ zerr = inflate(&zstream, Z_NO_FLUSH);
+ if (zerr != Z_OK && zerr != Z_STREAM_END) {
+ LOGD("zlib inflate call failed (zerr=%d)\n", zerr);
+ 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 != sizeof(procBuf)))
+ {
+ long procSize = zstream.next_out - procBuf;
+ LOGVV("+++ processing %d bytes\n", (int) procSize);
+ bool ret = processFunction(procBuf, procSize, cookie);
+ if (!ret) {
+ LOGW("Process function elected to fail (in inflate)\n");
+ goto z_bail;
+ }
+
+ zstream.next_out = procBuf;
+ zstream.avail_out = sizeof(procBuf);
+ }
+ } while (zerr == Z_OK);
+
+ assert(zerr == Z_STREAM_END); /* other errors should've been caught */
+
+ // success!
+ result = zstream.total_out;
+
+z_bail:
+ inflateEnd(&zstream); /* free up any allocated structures */
+
+bail:
+ if (result != pEntry->uncompLen) {
+ if (result != -1) // error already shown?
+ LOGW("Size mismatch on inflated file (%ld vs %ld)\n",
+ result, pEntry->uncompLen);
+ return false;
+ }
+ return true;
+}
+
+/*
+ * Stream the uncompressed data through the supplied function,
+ * passing cookie to it each time it gets called. processFunction
+ * may be called more than once.
+ *
+ * If processFunction returns false, the operation is abandoned and
+ * mzProcessZipEntryContents() immediately returns false.
+ *
+ * This is useful for calculating the hash of an entry's uncompressed contents.
+ */
+bool mzProcessZipEntryContents(const ZipArchive *pArchive,
+ const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
+ void *cookie)
+{
+ bool ret = false;
+ off_t oldOff;
+
+ /* save current offset */
+ oldOff = lseek(pArchive->fd, 0, SEEK_CUR);
+
+ /* Seek to the beginning of the entry's compressed data. */
+ lseek(pArchive->fd, pEntry->offset, SEEK_SET);
+
+ switch (pEntry->compression) {
+ case STORED:
+ ret = processStoredEntry(pArchive, pEntry, processFunction, cookie);
+ break;
+ case DEFLATED:
+ ret = processDeflatedEntry(pArchive, pEntry, processFunction, cookie);
+ break;
+ default:
+ LOGE("Unsupported compression type %d for entry '%s'\n",
+ pEntry->compression, pEntry->fileName);
+ break;
+ }
+
+ /* restore file offset */
+ lseek(pArchive->fd, oldOff, SEEK_SET);
+ return ret;
+}
+
+static bool crcProcessFunction(const unsigned char *data, int dataLen,
+ void *crc)
+{
+ *(unsigned long *)crc = crc32(*(unsigned long *)crc, data, dataLen);
+ return true;
+}
+
+/*
+ * Check the CRC on this entry; return true if it is correct.
+ * May do other internal checks as well.
+ */
+bool mzIsZipEntryIntact(const ZipArchive *pArchive, const ZipEntry *pEntry)
+{
+ unsigned long crc;
+ bool ret;
+
+ crc = crc32(0L, Z_NULL, 0);
+ ret = mzProcessZipEntryContents(pArchive, pEntry, crcProcessFunction,
+ (void *)&crc);
+ if (!ret) {
+ LOGE("Can't calculate CRC for entry\n");
+ return false;
+ }
+ if (crc != (unsigned long)pEntry->crc32) {
+ LOGW("CRC for entry %.*s (0x%08lx) != expected (0x%08lx)\n",
+ pEntry->fileNameLen, pEntry->fileName, crc, pEntry->crc32);
+ return false;
+ }
+ return true;
+}
+
+typedef struct {
+ char *buf;
+ int bufLen;
+} CopyProcessArgs;
+
+static bool copyProcessFunction(const unsigned char *data, int dataLen,
+ void *cookie)
+{
+ CopyProcessArgs *args = (CopyProcessArgs *)cookie;
+ if (dataLen <= args->bufLen) {
+ memcpy(args->buf, data, dataLen);
+ args->buf += dataLen;
+ args->bufLen -= dataLen;
+ return true;
+ }
+ return false;
+}
+
+/*
+ * Read an entry into a buffer allocated by the caller.
+ */
+bool mzReadZipEntry(const ZipArchive* pArchive, const ZipEntry* pEntry,
+ char *buf, int bufLen)
+{
+ CopyProcessArgs args;
+ bool ret;
+
+ args.buf = buf;
+ args.bufLen = bufLen;
+ ret = mzProcessZipEntryContents(pArchive, pEntry, copyProcessFunction,
+ (void *)&args);
+ if (!ret) {
+ LOGE("Can't extract entry to buffer.\n");
+ return false;
+ }
+ return true;
+}
+
+static bool writeProcessFunction(const unsigned char *data, int dataLen,
+ void *cookie)
+{
+ int fd = (int)cookie;
+
+ ssize_t soFar = 0;
+ while (true) {
+ ssize_t n = write(fd, data+soFar, dataLen-soFar);
+ if (n <= 0) {
+ LOGE("Error writing %ld bytes from zip file from %p: %s\n",
+ dataLen-soFar, data+soFar, strerror(errno));
+ if (errno != EINTR) {
+ return false;
+ }
+ } else if (n > 0) {
+ soFar += n;
+ if (soFar == dataLen) return true;
+ if (soFar > dataLen) {
+ LOGE("write overrun? (%ld bytes instead of %d)\n",
+ soFar, dataLen);
+ return false;
+ }
+ }
+ }
+}
+
+/*
+ * Uncompress "pEntry" in "pArchive" to "fd" at the current offset.
+ */
+bool mzExtractZipEntryToFile(const ZipArchive *pArchive,
+ const ZipEntry *pEntry, int fd)
+{
+ bool ret = mzProcessZipEntryContents(pArchive, pEntry, writeProcessFunction,
+ (void*)fd);
+ if (!ret) {
+ LOGE("Can't extract entry to file.\n");
+ return false;
+ }
+ return true;
+}
+
+typedef struct {
+ unsigned char* buffer;
+ long len;
+} BufferExtractCookie;
+
+static bool bufferProcessFunction(const unsigned char *data, int dataLen,
+ void *cookie) {
+ BufferExtractCookie *bec = (BufferExtractCookie*)cookie;
+
+ memmove(bec->buffer, data, dataLen);
+ bec->buffer += dataLen;
+ bec->len -= dataLen;
+
+ return true;
+}
+
+/*
+ * Uncompress "pEntry" in "pArchive" to buffer, which must be large
+ * enough to hold mzGetZipEntryUncomplen(pEntry) bytes.
+ */
+bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive,
+ const ZipEntry *pEntry, unsigned char *buffer)
+{
+ BufferExtractCookie bec;
+ bec.buffer = buffer;
+ bec.len = mzGetZipEntryUncompLen(pEntry);
+
+ bool ret = mzProcessZipEntryContents(pArchive, pEntry,
+ bufferProcessFunction, (void*)&bec);
+ if (!ret || bec.len != 0) {
+ LOGE("Can't extract entry to memory buffer.\n");
+ return false;
+ }
+ return true;
+}
+
+
+/* Helper state to make path translation easier and less malloc-happy.
+ */
+typedef struct {
+ const char *targetDir;
+ const char *zipDir;
+ char *buf;
+ int targetDirLen;
+ int zipDirLen;
+ int bufLen;
+} MzPathHelper;
+
+/* Given the values of targetDir and zipDir in the helper,
+ * return the target filename of the provided entry.
+ * The helper must be initialized first.
+ */
+static const char *targetEntryPath(MzPathHelper *helper, ZipEntry *pEntry)
+{
+ int needLen;
+ bool firstTime = (helper->buf == NULL);
+
+ /* target file <-- targetDir + / + entry[zipDirLen:]
+ */
+ needLen = helper->targetDirLen + 1 +
+ pEntry->fileNameLen - helper->zipDirLen + 1;
+ if (needLen > helper->bufLen) {
+ char *newBuf;
+
+ needLen *= 2;
+ newBuf = (char *)realloc(helper->buf, needLen);
+ if (newBuf == NULL) {
+ return NULL;
+ }
+ helper->buf = newBuf;
+ helper->bufLen = needLen;
+ }
+
+ /* Every path will start with the target path and a slash.
+ */
+ if (firstTime) {
+ char *p = helper->buf;
+ memcpy(p, helper->targetDir, helper->targetDirLen);
+ p += helper->targetDirLen;
+ if (p == helper->buf || p[-1] != '/') {
+ helper->targetDirLen += 1;
+ *p++ = '/';
+ }
+ }
+
+ /* Replace the custom part of the path with the appropriate
+ * part of the entry's path.
+ */
+ char *epath = helper->buf + helper->targetDirLen;
+ memcpy(epath, pEntry->fileName + helper->zipDirLen,
+ pEntry->fileNameLen - helper->zipDirLen);
+ epath += pEntry->fileNameLen - helper->zipDirLen;
+ *epath = '\0';
+
+ return helper->buf;
+}
+
+/*
+ * Inflate all entries under zipDir to the directory specified by
+ * targetDir, which must exist and be a writable directory.
+ *
+ * The immediate children of zipDir will become the immediate
+ * children of targetDir; e.g., if the archive contains the entries
+ *
+ * a/b/c/one
+ * a/b/c/two
+ * a/b/c/d/three
+ *
+ * and mzExtractRecursive(a, "a/b/c", "/tmp") is called, the resulting
+ * files will be
+ *
+ * /tmp/one
+ * /tmp/two
+ * /tmp/d/three
+ *
+ * Returns true on success, false on failure.
+ */
+bool mzExtractRecursive(const ZipArchive *pArchive,
+ const char *zipDir, const char *targetDir,
+ int flags, const struct utimbuf *timestamp,
+ void (*callback)(const char *fn, void *), void *cookie,
+ struct selabel_handle *sehnd)
+{
+ if (zipDir[0] == '/') {
+ LOGE("mzExtractRecursive(): zipDir must be a relative path.\n");
+ return false;
+ }
+ if (targetDir[0] != '/') {
+ LOGE("mzExtractRecursive(): targetDir must be an absolute path.\n");
+ return false;
+ }
+
+ unsigned int zipDirLen;
+ char *zpath;
+
+ zipDirLen = strlen(zipDir);
+ zpath = (char *)malloc(zipDirLen + 2);
+ if (zpath == NULL) {
+ LOGE("Can't allocate %d bytes for zip path\n", zipDirLen + 2);
+ return false;
+ }
+ /* If zipDir is empty, we'll extract the entire zip file.
+ * Otherwise, canonicalize the path.
+ */
+ if (zipDirLen > 0) {
+ /* Make sure there's (hopefully, exactly one) slash at the
+ * end of the path. This way we don't need to worry about
+ * accidentally extracting "one/twothree" when a path like
+ * "one/two" is specified.
+ */
+ memcpy(zpath, zipDir, zipDirLen);
+ if (zpath[zipDirLen-1] != '/') {
+ zpath[zipDirLen++] = '/';
+ }
+ }
+ zpath[zipDirLen] = '\0';
+
+ /* Set up the helper structure that we'll use to assemble paths.
+ */
+ MzPathHelper helper;
+ helper.targetDir = targetDir;
+ helper.targetDirLen = strlen(helper.targetDir);
+ helper.zipDir = zpath;
+ helper.zipDirLen = strlen(helper.zipDir);
+ helper.buf = NULL;
+ helper.bufLen = 0;
+
+ /* Walk through the entries and extract anything whose path begins
+ * with zpath.
+//TODO: since the entries are sorted, binary search for the first match
+// and stop after the first non-match.
+ */
+ unsigned int i;
+ bool seenMatch = false;
+ int ok = true;
+ for (i = 0; i < pArchive->numEntries; i++) {
+ ZipEntry *pEntry = pArchive->pEntries + i;
+ if (pEntry->fileNameLen < zipDirLen) {
+//TODO: look out for a single empty directory entry that matches zpath, but
+// missing the trailing slash. Most zip files seem to include
+// the trailing slash, but I think it's legal to leave it off.
+// e.g., zpath "a/b/", entry "a/b", with no children of the entry.
+ /* No chance of matching.
+ */
+#if SORT_ENTRIES
+ if (seenMatch) {
+ /* Since the entries are sorted, we can give up
+ * on the first mismatch after the first match.
+ */
+ break;
+ }
+#endif
+ continue;
+ }
+ /* If zpath is empty, this strncmp() will match everything,
+ * which is what we want.
+ */
+ if (strncmp(pEntry->fileName, zpath, zipDirLen) != 0) {
+#if SORT_ENTRIES
+ if (seenMatch) {
+ /* Since the entries are sorted, we can give up
+ * on the first mismatch after the first match.
+ */
+ break;
+ }
+#endif
+ continue;
+ }
+ /* This entry begins with zipDir, so we'll extract it.
+ */
+ seenMatch = true;
+
+ /* Find the target location of the entry.
+ */
+ const char *targetFile = targetEntryPath(&helper, pEntry);
+ if (targetFile == NULL) {
+ LOGE("Can't assemble target path for \"%.*s\"\n",
+ pEntry->fileNameLen, pEntry->fileName);
+ ok = false;
+ 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 {
+ /* This is not a directory. First, make sure that
+ * the containing directory exists.
+ */
+ int ret = dirCreateHierarchy(
+ targetFile, UNZIP_DIRMODE, timestamp, true, sehnd);
+ if (ret != 0) {
+ LOGE("Can't create containing directory for \"%s\": %s\n",
+ targetFile, strerror(errno));
+ ok = false;
+ break;
+ }
+
+ /* With FILES_ONLY set, we need to ignore metadata entirely,
+ * so treat symlinks as regular files.
+ */
+ 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.
+ */
+
+#ifdef HAVE_SELINUX
+ char *secontext = NULL;
+
+ if (sehnd) {
+ selabel_lookup(sehnd, &secontext, targetFile, UNZIP_FILEMODE);
+ setfscreatecon(secontext);
+ }
+#endif
+
+ int fd = creat(targetFile, UNZIP_FILEMODE);
+
+#ifdef HAVE_SELINUX
+ if (secontext) {
+ freecon(secontext);
+ setfscreatecon(NULL);
+ }
+#endif
+
+ if (fd < 0) {
+ LOGE("Can't create target file \"%s\": %s\n",
+ targetFile, strerror(errno));
+ ok = false;
+ break;
+ }
+
+ bool ok = mzExtractZipEntryToFile(pArchive, pEntry, fd);
+ close(fd);
+ if (!ok) {
+ LOGE("Error extracting \"%s\"\n", targetFile);
+ ok = false;
+ break;
+ }
+
+ if (timestamp != NULL && utime(targetFile, timestamp)) {
+ LOGE("Error touching \"%s\"\n", targetFile);
+ ok = false;
+ break;
+ }
+
+ LOGD("Extracted file \"%s\"\n", targetFile);
+ }
+ }
+
+ if (callback != NULL) callback(targetFile, cookie);
+ }
+
+ free(helper.buf);
+ free(zpath);
+
+ return ok;
+}