diff --git a/libs/androidfw/ZipUtils.cpp b/libs/androidfw/ZipUtils.cpp
new file mode 100644
index 0000000..997eb7d
--- /dev/null
+++ b/libs/androidfw/ZipUtils.cpp
@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Misc zip/gzip utility functions.
+//
+
+#define LOG_TAG "ziputil"
+
+#include <androidfw/ZipUtils.h>
+#include <androidfw/ZipFileRO.h>
+#include <utils/Log.h>
+#include <utils/Compat.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <zlib.h>
+
+using namespace android;
+
+/*
+ * Utility function that expands zip/gzip "deflate" compressed data
+ * into a buffer.
+ *
+ * "fd" is an open file positioned at the start of the "deflate" data
+ * "buf" must hold at least "uncompressedLen" bytes.
+ */
+/*static*/ bool ZipUtils::inflateToBuffer(int fd, void* buf,
+    long uncompressedLen, long compressedLen)
+{
+    bool result = false;
+	const unsigned long kReadBufSize = 32768;
+	unsigned char* readBuf = NULL;
+    z_stream zstream;
+    int zerr;
+    unsigned long compRemaining;
+
+    assert(uncompressedLen >= 0);
+    assert(compressedLen >= 0);
+
+	readBuf = new unsigned char[kReadBufSize];
+	if (readBuf == NULL)
+        goto bail;
+    compRemaining = compressedLen;
+
+    /*
+     * 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*) buf;
+    zstream.avail_out = uncompressedLen;
+    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) {
+            ALOGE("Installed zlib is not compatible with linked version (%s)\n",
+                ZLIB_VERSION);
+        } else {
+            ALOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr);
+        }
+        goto bail;
+    }
+
+    /*
+     * Loop while we have data.
+     */
+    do {
+        unsigned long getSize;
+
+        /* read as much as we can */
+        if (zstream.avail_in == 0) {
+            getSize = (compRemaining > kReadBufSize) ?
+                        kReadBufSize : compRemaining;
+            ALOGV("+++ reading %ld bytes (%ld left)\n",
+                getSize, compRemaining);
+
+            int cc = TEMP_FAILURE_RETRY(read(fd, readBuf, getSize));
+            if (cc < 0) {
+                ALOGW("inflate read failed: %s", strerror(errno));
+            } else if (cc != (int) getSize) {
+                ALOGW("inflate read failed (%d vs %ld)", 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) {
+            ALOGD("zlib inflate call failed (zerr=%d)\n", zerr);
+            goto z_bail;
+        }
+
+		/* output buffer holds all, so no need to write the output */
+    } while (zerr == Z_OK);
+
+    assert(zerr == Z_STREAM_END);       /* other errors should've been caught */
+
+    if ((long) zstream.total_out != uncompressedLen) {
+        ALOGW("Size mismatch on inflated file (%ld vs %ld)\n",
+            zstream.total_out, uncompressedLen);
+        goto z_bail;
+    }
+
+    // success!
+    result = true;
+
+z_bail:
+    inflateEnd(&zstream);        /* free up any allocated structures */
+
+bail:
+	delete[] readBuf;
+    return result;
+}
+
+/*
+ * Utility function that expands zip/gzip "deflate" compressed data
+ * into a buffer.
+ *
+ * (This is a clone of the previous function, but it takes a FILE* instead
+ * of an fd.  We could pass fileno(fd) to the above, but we can run into
+ * trouble when "fp" has a different notion of what fd's file position is.)
+ *
+ * "fp" is an open file positioned at the start of the "deflate" data
+ * "buf" must hold at least "uncompressedLen" bytes.
+ */
+/*static*/ bool ZipUtils::inflateToBuffer(FILE* fp, void* buf,
+    long uncompressedLen, long compressedLen)
+{
+    bool result = false;
+	const unsigned long kReadBufSize = 32768;
+	unsigned char* readBuf = NULL;
+    z_stream zstream;
+    int zerr;
+    unsigned long compRemaining;
+
+    assert(uncompressedLen >= 0);
+    assert(compressedLen >= 0);
+
+	readBuf = new unsigned char[kReadBufSize];
+	if (readBuf == NULL)
+        goto bail;
+    compRemaining = compressedLen;
+
+    /*
+     * 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*) buf;
+    zstream.avail_out = uncompressedLen;
+    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) {
+            ALOGE("Installed zlib is not compatible with linked version (%s)\n",
+                ZLIB_VERSION);
+        } else {
+            ALOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr);
+        }
+        goto bail;
+    }
+
+    /*
+     * Loop while we have data.
+     */
+    do {
+        unsigned long getSize;
+
+        /* read as much as we can */
+        if (zstream.avail_in == 0) {
+            getSize = (compRemaining > kReadBufSize) ?
+                        kReadBufSize : compRemaining;
+            ALOGV("+++ reading %ld bytes (%ld left)\n",
+                getSize, compRemaining);
+
+            int cc = fread(readBuf, 1, getSize, fp);
+            if (cc != (int) getSize) {
+                ALOGD("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) {
+            ALOGD("zlib inflate call failed (zerr=%d)\n", zerr);
+            goto z_bail;
+        }
+
+		/* output buffer holds all, so no need to write the output */
+    } while (zerr == Z_OK);
+
+    assert(zerr == Z_STREAM_END);       /* other errors should've been caught */
+
+    if ((long) zstream.total_out != uncompressedLen) {
+        ALOGW("Size mismatch on inflated file (%ld vs %ld)\n",
+            zstream.total_out, uncompressedLen);
+        goto z_bail;
+    }
+
+    // success!
+    result = true;
+
+z_bail:
+    inflateEnd(&zstream);        /* free up any allocated structures */
+
+bail:
+	delete[] readBuf;
+    return result;
+}
+
+/*
+ * Look at the contents of a gzip archive.  We want to know where the
+ * data starts, and how long it will be after it is uncompressed.
+ *
+ * We expect to find the CRC and length as the last 8 bytes on the file.
+ * This is a pretty reasonable thing to expect for locally-compressed
+ * files, but there's a small chance that some extra padding got thrown
+ * on (the man page talks about compressed data written to tape).  We
+ * don't currently deal with that here.  If "gzip -l" whines, we're going
+ * to fail too.
+ *
+ * On exit, "fp" is pointing at the start of the compressed data.
+ */
+/*static*/ bool ZipUtils::examineGzip(FILE* fp, int* pCompressionMethod,
+    long* pUncompressedLen, long* pCompressedLen, unsigned long* pCRC32)
+{
+    enum {  // flags
+        FTEXT       = 0x01,
+        FHCRC       = 0x02,
+        FEXTRA      = 0x04,
+        FNAME       = 0x08,
+        FCOMMENT    = 0x10,
+    };
+    int ic;
+    int method, flags;
+    int i;
+
+    ic = getc(fp);
+    if (ic != 0x1f || getc(fp) != 0x8b)
+        return false;       // not gzip
+    method = getc(fp);
+    flags = getc(fp);
+
+    /* quick sanity checks */
+    if (method == EOF || flags == EOF)
+        return false;
+    if (method != ZipFileRO::kCompressDeflated)
+        return false;
+
+    /* skip over 4 bytes of mod time, 1 byte XFL, 1 byte OS */
+    for (i = 0; i < 6; i++)
+        (void) getc(fp);
+    /* consume "extra" field, if present */
+    if ((flags & FEXTRA) != 0) {
+        int len;
+
+        len = getc(fp);
+        len |= getc(fp) << 8;
+        while (len-- && getc(fp) != EOF)
+            ;
+    }
+    /* consume filename, if present */
+    if ((flags & FNAME) != 0) {
+        do {
+            ic = getc(fp);
+        } while (ic != 0 && ic != EOF);
+    }
+    /* consume comment, if present */
+    if ((flags & FCOMMENT) != 0) {
+        do {
+            ic = getc(fp);
+        } while (ic != 0 && ic != EOF);
+    }
+    /* consume 16-bit header CRC, if present */
+    if ((flags & FHCRC) != 0) {
+        (void) getc(fp);
+        (void) getc(fp);
+    }
+
+    if (feof(fp) || ferror(fp))
+        return false;
+
+    /* seek to the end; CRC and length are in the last 8 bytes */
+    long curPosn = ftell(fp);
+    unsigned char buf[8];
+    fseek(fp, -8, SEEK_END);
+    *pCompressedLen = ftell(fp) - curPosn;
+
+    if (fread(buf, 1, 8, fp) != 8)
+        return false;
+    /* seek back to start of compressed data */
+    fseek(fp, curPosn, SEEK_SET);
+
+    *pCompressionMethod = method;
+    *pCRC32 = ZipFileRO::get4LE(&buf[0]);
+    *pUncompressedLen = ZipFileRO::get4LE(&buf[4]);
+
+    return true;
+}