diff --git a/tools/zipalign/Android.mk b/tools/zipalign/Android.mk
index e23b699..f90a31c 100644
--- a/tools/zipalign/Android.mk
+++ b/tools/zipalign/Android.mk
@@ -8,7 +8,9 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \
-	ZipAlign.cpp
+	ZipAlign.cpp \
+	ZipEntry.cpp \
+	ZipFile.cpp
 
 LOCAL_C_INCLUDES += external/zlib
 
diff --git a/tools/zipalign/ZipAlign.cpp b/tools/zipalign/ZipAlign.cpp
index 058f9ed..eab2f04 100644
--- a/tools/zipalign/ZipAlign.cpp
+++ b/tools/zipalign/ZipAlign.cpp
@@ -16,7 +16,7 @@
 /*
  * Zip alignment tool
  */
-#include "utils/ZipFile.h"
+#include "ZipFile.h"
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/tools/zipalign/ZipEntry.cpp b/tools/zipalign/ZipEntry.cpp
new file mode 100644
index 0000000..bed0333
--- /dev/null
+++ b/tools/zipalign/ZipEntry.cpp
@@ -0,0 +1,696 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+//
+// Access to entries in a Zip archive.
+//
+
+#define LOG_TAG "zip"
+
+#include "ZipEntry.h"
+#include <utils/Log.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+using namespace android;
+
+/*
+ * Initialize a new ZipEntry structure from a FILE* positioned at a
+ * CentralDirectoryEntry.
+ *
+ * On exit, the file pointer will be at the start of the next CDE or
+ * at the EOCD.
+ */
+status_t ZipEntry::initFromCDE(FILE* fp)
+{
+    status_t result;
+    long posn;
+    bool hasDD;
+
+    //LOGV("initFromCDE ---\n");
+
+    /* read the CDE */
+    result = mCDE.read(fp);
+    if (result != NO_ERROR) {
+        LOGD("mCDE.read failed\n");
+        return result;
+    }
+
+    //mCDE.dump();
+
+    /* using the info in the CDE, go load up the LFH */
+    posn = ftell(fp);
+    if (fseek(fp, mCDE.mLocalHeaderRelOffset, SEEK_SET) != 0) {
+        LOGD("local header seek failed (%ld)\n",
+            mCDE.mLocalHeaderRelOffset);
+        return UNKNOWN_ERROR;
+    }
+
+    result = mLFH.read(fp);
+    if (result != NO_ERROR) {
+        LOGD("mLFH.read failed\n");
+        return result;
+    }
+
+    if (fseek(fp, posn, SEEK_SET) != 0)
+        return UNKNOWN_ERROR;
+
+    //mLFH.dump();
+
+    /*
+     * We *might* need to read the Data Descriptor at this point and
+     * integrate it into the LFH.  If this bit is set, the CRC-32,
+     * compressed size, and uncompressed size will be zero.  In practice
+     * these seem to be rare.
+     */
+    hasDD = (mLFH.mGPBitFlag & kUsesDataDescr) != 0;
+    if (hasDD) {
+        // do something clever
+        //LOGD("+++ has data descriptor\n");
+    }
+
+    /*
+     * Sanity-check the LFH.  Note that this will fail if the "kUsesDataDescr"
+     * flag is set, because the LFH is incomplete.  (Not a problem, since we
+     * prefer the CDE values.)
+     */
+    if (!hasDD && !compareHeaders()) {
+        LOGW("WARNING: header mismatch\n");
+        // keep going?
+    }
+
+    /*
+     * If the mVersionToExtract is greater than 20, we may have an
+     * issue unpacking the record -- could be encrypted, compressed
+     * with something we don't support, or use Zip64 extensions.  We
+     * can defer worrying about that to when we're extracting data.
+     */
+
+    return NO_ERROR;
+}
+
+/*
+ * Initialize a new entry.  Pass in the file name and an optional comment.
+ *
+ * Initializes the CDE and the LFH.
+ */
+void ZipEntry::initNew(const char* fileName, const char* comment)
+{
+    assert(fileName != NULL && *fileName != '\0');  // name required
+
+    /* most fields are properly initialized by constructor */
+    mCDE.mVersionMadeBy = kDefaultMadeBy;
+    mCDE.mVersionToExtract = kDefaultVersion;
+    mCDE.mCompressionMethod = kCompressStored;
+    mCDE.mFileNameLength = strlen(fileName);
+    if (comment != NULL)
+        mCDE.mFileCommentLength = strlen(comment);
+    mCDE.mExternalAttrs = 0x81b60020;   // matches what WinZip does
+
+    if (mCDE.mFileNameLength > 0) {
+        mCDE.mFileName = new unsigned char[mCDE.mFileNameLength+1];
+        strcpy((char*) mCDE.mFileName, fileName);
+    }
+    if (mCDE.mFileCommentLength > 0) {
+        /* TODO: stop assuming null-terminated ASCII here? */
+        mCDE.mFileComment = new unsigned char[mCDE.mFileCommentLength+1];
+        strcpy((char*) mCDE.mFileComment, comment);
+    }
+
+    copyCDEtoLFH();
+}
+
+/*
+ * Initialize a new entry, starting with the ZipEntry from a different
+ * archive.
+ *
+ * Initializes the CDE and the LFH.
+ */
+status_t ZipEntry::initFromExternal(const ZipFile* pZipFile,
+    const ZipEntry* pEntry)
+{
+    /*
+     * Copy everything in the CDE over, then fix up the hairy bits.
+     */
+    memcpy(&mCDE, &pEntry->mCDE, sizeof(mCDE));
+
+    if (mCDE.mFileNameLength > 0) {
+        mCDE.mFileName = new unsigned char[mCDE.mFileNameLength+1];
+        if (mCDE.mFileName == NULL)
+            return NO_MEMORY;
+        strcpy((char*) mCDE.mFileName, (char*)pEntry->mCDE.mFileName);
+    }
+    if (mCDE.mFileCommentLength > 0) {
+        mCDE.mFileComment = new unsigned char[mCDE.mFileCommentLength+1];
+        if (mCDE.mFileComment == NULL)
+            return NO_MEMORY;
+        strcpy((char*) mCDE.mFileComment, (char*)pEntry->mCDE.mFileComment);
+    }
+    if (mCDE.mExtraFieldLength > 0) {
+        /* we null-terminate this, though it may not be a string */
+        mCDE.mExtraField = new unsigned char[mCDE.mExtraFieldLength+1];
+        if (mCDE.mExtraField == NULL)
+            return NO_MEMORY;
+        memcpy(mCDE.mExtraField, pEntry->mCDE.mExtraField,
+            mCDE.mExtraFieldLength+1);
+    }
+
+    /* construct the LFH from the CDE */
+    copyCDEtoLFH();
+
+    /*
+     * The LFH "extra" field is independent of the CDE "extra", so we
+     * handle it here.
+     */
+    assert(mLFH.mExtraField == NULL);
+    mLFH.mExtraFieldLength = pEntry->mLFH.mExtraFieldLength;
+    if (mLFH.mExtraFieldLength > 0) {
+        mLFH.mExtraField = new unsigned char[mLFH.mExtraFieldLength+1];
+        if (mLFH.mExtraField == NULL)
+            return NO_MEMORY;
+        memcpy(mLFH.mExtraField, pEntry->mLFH.mExtraField,
+            mLFH.mExtraFieldLength+1);
+    }
+
+    return NO_ERROR;
+}
+
+/*
+ * Insert pad bytes in the LFH by tweaking the "extra" field.  This will
+ * potentially confuse something that put "extra" data in here earlier,
+ * but I can't find an actual problem.
+ */
+status_t ZipEntry::addPadding(int padding)
+{
+    if (padding <= 0)
+        return INVALID_OPERATION;
+
+    //LOGI("HEY: adding %d pad bytes to existing %d in %s\n",
+    //    padding, mLFH.mExtraFieldLength, mCDE.mFileName);
+
+    if (mLFH.mExtraFieldLength > 0) {
+        /* extend existing field */
+        unsigned char* newExtra;
+
+        newExtra = new unsigned char[mLFH.mExtraFieldLength + padding];
+        if (newExtra == NULL)
+            return NO_MEMORY;
+        memset(newExtra + mLFH.mExtraFieldLength, 0, padding);
+        memcpy(newExtra, mLFH.mExtraField, mLFH.mExtraFieldLength);
+
+        delete[] mLFH.mExtraField;
+        mLFH.mExtraField = newExtra;
+        mLFH.mExtraFieldLength += padding;
+    } else {
+        /* create new field */
+        mLFH.mExtraField = new unsigned char[padding];
+        memset(mLFH.mExtraField, 0, padding);
+        mLFH.mExtraFieldLength = padding;
+    }
+
+    return NO_ERROR;
+}
+
+/*
+ * Set the fields in the LFH equal to the corresponding fields in the CDE.
+ *
+ * This does not touch the LFH "extra" field.
+ */
+void ZipEntry::copyCDEtoLFH(void)
+{
+    mLFH.mVersionToExtract  = mCDE.mVersionToExtract;
+    mLFH.mGPBitFlag         = mCDE.mGPBitFlag;
+    mLFH.mCompressionMethod = mCDE.mCompressionMethod;
+    mLFH.mLastModFileTime   = mCDE.mLastModFileTime;
+    mLFH.mLastModFileDate   = mCDE.mLastModFileDate;
+    mLFH.mCRC32             = mCDE.mCRC32;
+    mLFH.mCompressedSize    = mCDE.mCompressedSize;
+    mLFH.mUncompressedSize  = mCDE.mUncompressedSize;
+    mLFH.mFileNameLength    = mCDE.mFileNameLength;
+    // the "extra field" is independent
+
+    delete[] mLFH.mFileName;
+    if (mLFH.mFileNameLength > 0) {
+        mLFH.mFileName = new unsigned char[mLFH.mFileNameLength+1];
+        strcpy((char*) mLFH.mFileName, (const char*) mCDE.mFileName);
+    } else {
+        mLFH.mFileName = NULL;
+    }
+}
+
+/*
+ * Set some information about a file after we add it.
+ */
+void ZipEntry::setDataInfo(long uncompLen, long compLen, unsigned long crc32,
+    int compressionMethod)
+{
+    mCDE.mCompressionMethod = compressionMethod;
+    mCDE.mCRC32 = crc32;
+    mCDE.mCompressedSize = compLen;
+    mCDE.mUncompressedSize = uncompLen;
+    mCDE.mCompressionMethod = compressionMethod;
+    if (compressionMethod == kCompressDeflated) {
+        mCDE.mGPBitFlag |= 0x0002;      // indicates maximum compression used
+    }
+    copyCDEtoLFH();
+}
+
+/*
+ * See if the data in mCDE and mLFH match up.  This is mostly useful for
+ * debugging these classes, but it can be used to identify damaged
+ * archives.
+ *
+ * Returns "false" if they differ.
+ */
+bool ZipEntry::compareHeaders(void) const
+{
+    if (mCDE.mVersionToExtract != mLFH.mVersionToExtract) {
+        LOGV("cmp: VersionToExtract\n");
+        return false;
+    }
+    if (mCDE.mGPBitFlag != mLFH.mGPBitFlag) {
+        LOGV("cmp: GPBitFlag\n");
+        return false;
+    }
+    if (mCDE.mCompressionMethod != mLFH.mCompressionMethod) {
+        LOGV("cmp: CompressionMethod\n");
+        return false;
+    }
+    if (mCDE.mLastModFileTime != mLFH.mLastModFileTime) {
+        LOGV("cmp: LastModFileTime\n");
+        return false;
+    }
+    if (mCDE.mLastModFileDate != mLFH.mLastModFileDate) {
+        LOGV("cmp: LastModFileDate\n");
+        return false;
+    }
+    if (mCDE.mCRC32 != mLFH.mCRC32) {
+        LOGV("cmp: CRC32\n");
+        return false;
+    }
+    if (mCDE.mCompressedSize != mLFH.mCompressedSize) {
+        LOGV("cmp: CompressedSize\n");
+        return false;
+    }
+    if (mCDE.mUncompressedSize != mLFH.mUncompressedSize) {
+        LOGV("cmp: UncompressedSize\n");
+        return false;
+    }
+    if (mCDE.mFileNameLength != mLFH.mFileNameLength) {
+        LOGV("cmp: FileNameLength\n");
+        return false;
+    }
+#if 0       // this seems to be used for padding, not real data
+    if (mCDE.mExtraFieldLength != mLFH.mExtraFieldLength) {
+        LOGV("cmp: ExtraFieldLength\n");
+        return false;
+    }
+#endif
+    if (mCDE.mFileName != NULL) {
+        if (strcmp((char*) mCDE.mFileName, (char*) mLFH.mFileName) != 0) {
+            LOGV("cmp: FileName\n");
+            return false;
+        }
+    }
+
+    return true;
+}
+
+
+/*
+ * Convert the DOS date/time stamp into a UNIX time stamp.
+ */
+time_t ZipEntry::getModWhen(void) const
+{
+    struct tm parts;
+
+    parts.tm_sec = (mCDE.mLastModFileTime & 0x001f) << 1;
+    parts.tm_min = (mCDE.mLastModFileTime & 0x07e0) >> 5;
+    parts.tm_hour = (mCDE.mLastModFileTime & 0xf800) >> 11;
+    parts.tm_mday = (mCDE.mLastModFileDate & 0x001f);
+    parts.tm_mon = ((mCDE.mLastModFileDate & 0x01e0) >> 5) -1;
+    parts.tm_year = ((mCDE.mLastModFileDate & 0xfe00) >> 9) + 80;
+    parts.tm_wday = parts.tm_yday = 0;
+    parts.tm_isdst = -1;        // DST info "not available"
+
+    return mktime(&parts);
+}
+
+/*
+ * Set the CDE/LFH timestamp from UNIX time.
+ */
+void ZipEntry::setModWhen(time_t when)
+{
+#ifdef HAVE_LOCALTIME_R
+    struct tm tmResult;
+#endif
+    time_t even;
+    unsigned short zdate, ztime;
+
+    struct tm* ptm;
+
+    /* round up to an even number of seconds */
+    even = (time_t)(((unsigned long)(when) + 1) & (~1));
+
+    /* expand */
+#ifdef HAVE_LOCALTIME_R
+    ptm = localtime_r(&even, &tmResult);
+#else
+    ptm = localtime(&even);
+#endif
+
+    int year;
+    year = ptm->tm_year;
+    if (year < 80)
+        year = 80;
+
+    zdate = (year - 80) << 9 | (ptm->tm_mon+1) << 5 | ptm->tm_mday;
+    ztime = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
+
+    mCDE.mLastModFileTime = mLFH.mLastModFileTime = ztime;
+    mCDE.mLastModFileDate = mLFH.mLastModFileDate = zdate;
+}
+
+
+/*
+ * ===========================================================================
+ *      ZipEntry::LocalFileHeader
+ * ===========================================================================
+ */
+
+/*
+ * Read a local file header.
+ *
+ * On entry, "fp" points to the signature at the start of the header.
+ * On exit, "fp" points to the start of data.
+ */
+status_t ZipEntry::LocalFileHeader::read(FILE* fp)
+{
+    status_t result = NO_ERROR;
+    unsigned char buf[kLFHLen];
+
+    assert(mFileName == NULL);
+    assert(mExtraField == NULL);
+
+    if (fread(buf, 1, kLFHLen, fp) != kLFHLen) {
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
+        LOGD("whoops: didn't find expected signature\n");
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    mVersionToExtract = ZipEntry::getShortLE(&buf[0x04]);
+    mGPBitFlag = ZipEntry::getShortLE(&buf[0x06]);
+    mCompressionMethod = ZipEntry::getShortLE(&buf[0x08]);
+    mLastModFileTime = ZipEntry::getShortLE(&buf[0x0a]);
+    mLastModFileDate = ZipEntry::getShortLE(&buf[0x0c]);
+    mCRC32 = ZipEntry::getLongLE(&buf[0x0e]);
+    mCompressedSize = ZipEntry::getLongLE(&buf[0x12]);
+    mUncompressedSize = ZipEntry::getLongLE(&buf[0x16]);
+    mFileNameLength = ZipEntry::getShortLE(&buf[0x1a]);
+    mExtraFieldLength = ZipEntry::getShortLE(&buf[0x1c]);
+
+    // TODO: validate sizes
+
+    /* grab filename */
+    if (mFileNameLength != 0) {
+        mFileName = new unsigned char[mFileNameLength+1];
+        if (mFileName == NULL) {
+            result = NO_MEMORY;
+            goto bail;
+        }
+        if (fread(mFileName, 1, mFileNameLength, fp) != mFileNameLength) {
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        mFileName[mFileNameLength] = '\0';
+    }
+
+    /* grab extra field */
+    if (mExtraFieldLength != 0) {
+        mExtraField = new unsigned char[mExtraFieldLength+1];
+        if (mExtraField == NULL) {
+            result = NO_MEMORY;
+            goto bail;
+        }
+        if (fread(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength) {
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        mExtraField[mExtraFieldLength] = '\0';
+    }
+
+bail:
+    return result;
+}
+
+/*
+ * Write a local file header.
+ */
+status_t ZipEntry::LocalFileHeader::write(FILE* fp)
+{
+    unsigned char buf[kLFHLen];
+
+    ZipEntry::putLongLE(&buf[0x00], kSignature);
+    ZipEntry::putShortLE(&buf[0x04], mVersionToExtract);
+    ZipEntry::putShortLE(&buf[0x06], mGPBitFlag);
+    ZipEntry::putShortLE(&buf[0x08], mCompressionMethod);
+    ZipEntry::putShortLE(&buf[0x0a], mLastModFileTime);
+    ZipEntry::putShortLE(&buf[0x0c], mLastModFileDate);
+    ZipEntry::putLongLE(&buf[0x0e], mCRC32);
+    ZipEntry::putLongLE(&buf[0x12], mCompressedSize);
+    ZipEntry::putLongLE(&buf[0x16], mUncompressedSize);
+    ZipEntry::putShortLE(&buf[0x1a], mFileNameLength);
+    ZipEntry::putShortLE(&buf[0x1c], mExtraFieldLength);
+
+    if (fwrite(buf, 1, kLFHLen, fp) != kLFHLen)
+        return UNKNOWN_ERROR;
+
+    /* write filename */
+    if (mFileNameLength != 0) {
+        if (fwrite(mFileName, 1, mFileNameLength, fp) != mFileNameLength)
+            return UNKNOWN_ERROR;
+    }
+
+    /* write "extra field" */
+    if (mExtraFieldLength != 0) {
+        if (fwrite(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength)
+            return UNKNOWN_ERROR;
+    }
+
+    return NO_ERROR;
+}
+
+
+/*
+ * Dump the contents of a LocalFileHeader object.
+ */
+void ZipEntry::LocalFileHeader::dump(void) const
+{
+    LOGD(" LocalFileHeader contents:\n");
+    LOGD("  versToExt=%u gpBits=0x%04x compression=%u\n",
+        mVersionToExtract, mGPBitFlag, mCompressionMethod);
+    LOGD("  modTime=0x%04x modDate=0x%04x crc32=0x%08lx\n",
+        mLastModFileTime, mLastModFileDate, mCRC32);
+    LOGD("  compressedSize=%lu uncompressedSize=%lu\n",
+        mCompressedSize, mUncompressedSize);
+    LOGD("  filenameLen=%u extraLen=%u\n",
+        mFileNameLength, mExtraFieldLength);
+    if (mFileName != NULL)
+        LOGD("  filename: '%s'\n", mFileName);
+}
+
+
+/*
+ * ===========================================================================
+ *      ZipEntry::CentralDirEntry
+ * ===========================================================================
+ */
+
+/*
+ * Read the central dir entry that appears next in the file.
+ *
+ * On entry, "fp" should be positioned on the signature bytes for the
+ * entry.  On exit, "fp" will point at the signature word for the next
+ * entry or for the EOCD.
+ */
+status_t ZipEntry::CentralDirEntry::read(FILE* fp)
+{
+    status_t result = NO_ERROR;
+    unsigned char buf[kCDELen];
+
+    /* no re-use */
+    assert(mFileName == NULL);
+    assert(mExtraField == NULL);
+    assert(mFileComment == NULL);
+
+    if (fread(buf, 1, kCDELen, fp) != kCDELen) {
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
+        LOGD("Whoops: didn't find expected signature\n");
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    mVersionMadeBy = ZipEntry::getShortLE(&buf[0x04]);
+    mVersionToExtract = ZipEntry::getShortLE(&buf[0x06]);
+    mGPBitFlag = ZipEntry::getShortLE(&buf[0x08]);
+    mCompressionMethod = ZipEntry::getShortLE(&buf[0x0a]);
+    mLastModFileTime = ZipEntry::getShortLE(&buf[0x0c]);
+    mLastModFileDate = ZipEntry::getShortLE(&buf[0x0e]);
+    mCRC32 = ZipEntry::getLongLE(&buf[0x10]);
+    mCompressedSize = ZipEntry::getLongLE(&buf[0x14]);
+    mUncompressedSize = ZipEntry::getLongLE(&buf[0x18]);
+    mFileNameLength = ZipEntry::getShortLE(&buf[0x1c]);
+    mExtraFieldLength = ZipEntry::getShortLE(&buf[0x1e]);
+    mFileCommentLength = ZipEntry::getShortLE(&buf[0x20]);
+    mDiskNumberStart = ZipEntry::getShortLE(&buf[0x22]);
+    mInternalAttrs = ZipEntry::getShortLE(&buf[0x24]);
+    mExternalAttrs = ZipEntry::getLongLE(&buf[0x26]);
+    mLocalHeaderRelOffset = ZipEntry::getLongLE(&buf[0x2a]);
+
+    // TODO: validate sizes and offsets
+
+    /* grab filename */
+    if (mFileNameLength != 0) {
+        mFileName = new unsigned char[mFileNameLength+1];
+        if (mFileName == NULL) {
+            result = NO_MEMORY;
+            goto bail;
+        }
+        if (fread(mFileName, 1, mFileNameLength, fp) != mFileNameLength) {
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        mFileName[mFileNameLength] = '\0';
+    }
+
+    /* read "extra field" */
+    if (mExtraFieldLength != 0) {
+        mExtraField = new unsigned char[mExtraFieldLength+1];
+        if (mExtraField == NULL) {
+            result = NO_MEMORY;
+            goto bail;
+        }
+        if (fread(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength) {
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        mExtraField[mExtraFieldLength] = '\0';
+    }
+
+
+    /* grab comment, if any */
+    if (mFileCommentLength != 0) {
+        mFileComment = new unsigned char[mFileCommentLength+1];
+        if (mFileComment == NULL) {
+            result = NO_MEMORY;
+            goto bail;
+        }
+        if (fread(mFileComment, 1, mFileCommentLength, fp) != mFileCommentLength)
+        {
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        mFileComment[mFileCommentLength] = '\0';
+    }
+
+bail:
+    return result;
+}
+
+/*
+ * Write a central dir entry.
+ */
+status_t ZipEntry::CentralDirEntry::write(FILE* fp)
+{
+    unsigned char buf[kCDELen];
+
+    ZipEntry::putLongLE(&buf[0x00], kSignature);
+    ZipEntry::putShortLE(&buf[0x04], mVersionMadeBy);
+    ZipEntry::putShortLE(&buf[0x06], mVersionToExtract);
+    ZipEntry::putShortLE(&buf[0x08], mGPBitFlag);
+    ZipEntry::putShortLE(&buf[0x0a], mCompressionMethod);
+    ZipEntry::putShortLE(&buf[0x0c], mLastModFileTime);
+    ZipEntry::putShortLE(&buf[0x0e], mLastModFileDate);
+    ZipEntry::putLongLE(&buf[0x10], mCRC32);
+    ZipEntry::putLongLE(&buf[0x14], mCompressedSize);
+    ZipEntry::putLongLE(&buf[0x18], mUncompressedSize);
+    ZipEntry::putShortLE(&buf[0x1c], mFileNameLength);
+    ZipEntry::putShortLE(&buf[0x1e], mExtraFieldLength);
+    ZipEntry::putShortLE(&buf[0x20], mFileCommentLength);
+    ZipEntry::putShortLE(&buf[0x22], mDiskNumberStart);
+    ZipEntry::putShortLE(&buf[0x24], mInternalAttrs);
+    ZipEntry::putLongLE(&buf[0x26], mExternalAttrs);
+    ZipEntry::putLongLE(&buf[0x2a], mLocalHeaderRelOffset);
+
+    if (fwrite(buf, 1, kCDELen, fp) != kCDELen)
+        return UNKNOWN_ERROR;
+
+    /* write filename */
+    if (mFileNameLength != 0) {
+        if (fwrite(mFileName, 1, mFileNameLength, fp) != mFileNameLength)
+            return UNKNOWN_ERROR;
+    }
+
+    /* write "extra field" */
+    if (mExtraFieldLength != 0) {
+        if (fwrite(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength)
+            return UNKNOWN_ERROR;
+    }
+
+    /* write comment */
+    if (mFileCommentLength != 0) {
+        if (fwrite(mFileComment, 1, mFileCommentLength, fp) != mFileCommentLength)
+            return UNKNOWN_ERROR;
+    }
+
+    return NO_ERROR;
+}
+
+/*
+ * Dump the contents of a CentralDirEntry object.
+ */
+void ZipEntry::CentralDirEntry::dump(void) const
+{
+    LOGD(" CentralDirEntry contents:\n");
+    LOGD("  versMadeBy=%u versToExt=%u gpBits=0x%04x compression=%u\n",
+        mVersionMadeBy, mVersionToExtract, mGPBitFlag, mCompressionMethod);
+    LOGD("  modTime=0x%04x modDate=0x%04x crc32=0x%08lx\n",
+        mLastModFileTime, mLastModFileDate, mCRC32);
+    LOGD("  compressedSize=%lu uncompressedSize=%lu\n",
+        mCompressedSize, mUncompressedSize);
+    LOGD("  filenameLen=%u extraLen=%u commentLen=%u\n",
+        mFileNameLength, mExtraFieldLength, mFileCommentLength);
+    LOGD("  diskNumStart=%u intAttr=0x%04x extAttr=0x%08lx relOffset=%lu\n",
+        mDiskNumberStart, mInternalAttrs, mExternalAttrs,
+        mLocalHeaderRelOffset);
+
+    if (mFileName != NULL)
+        LOGD("  filename: '%s'\n", mFileName);
+    if (mFileComment != NULL)
+        LOGD("  comment: '%s'\n", mFileComment);
+}
+
diff --git a/tools/zipalign/ZipEntry.h b/tools/zipalign/ZipEntry.h
new file mode 100644
index 0000000..7f721b4
--- /dev/null
+++ b/tools/zipalign/ZipEntry.h
@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+//
+// Zip archive entries.
+//
+// The ZipEntry class is tightly meshed with the ZipFile class.
+//
+#ifndef __LIBS_ZIPENTRY_H
+#define __LIBS_ZIPENTRY_H
+
+#include <utils/Errors.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+namespace android {
+
+class ZipFile;
+
+/*
+ * ZipEntry objects represent a single entry in a Zip archive.
+ *
+ * You can use one of these to get or set information about an entry, but
+ * there are no functions here for accessing the data itself.  (We could
+ * tuck a pointer to the ZipFile in here for convenience, but that raises
+ * the likelihood of using ZipEntry objects after discarding the ZipFile.)
+ *
+ * File information is stored in two places: next to the file data (the Local
+ * File Header, and possibly a Data Descriptor), and at the end of the file
+ * (the Central Directory Entry).  The two must be kept in sync.
+ */
+class ZipEntry {
+public:
+    friend class ZipFile;
+
+    ZipEntry(void)
+        : mDeleted(false), mMarked(false)
+        {}
+    ~ZipEntry(void) {}
+
+    /*
+     * Returns "true" if the data is compressed.
+     */
+    bool isCompressed(void) const {
+        return mCDE.mCompressionMethod != kCompressStored;
+    }
+    int getCompressionMethod(void) const { return mCDE.mCompressionMethod; }
+
+    /*
+     * Return the uncompressed length.
+     */
+    off_t getUncompressedLen(void) const { return mCDE.mUncompressedSize; }
+
+    /*
+     * Return the compressed length.  For uncompressed data, this returns
+     * the same thing as getUncompresesdLen().
+     */
+    off_t getCompressedLen(void) const { return mCDE.mCompressedSize; }
+
+    /*
+     * Return the absolute file offset of the start of the compressed or
+     * uncompressed data.
+     */
+    off_t getFileOffset(void) const {
+        return mCDE.mLocalHeaderRelOffset +
+                LocalFileHeader::kLFHLen +
+                mLFH.mFileNameLength +
+                mLFH.mExtraFieldLength;
+    }
+
+    /*
+     * Return the data CRC.
+     */
+    unsigned long getCRC32(void) const { return mCDE.mCRC32; }
+
+    /*
+     * Return file modification time in UNIX seconds-since-epoch.
+     */
+    time_t getModWhen(void) const;
+
+    /*
+     * Return the archived file name.
+     */
+    const char* getFileName(void) const { return (const char*) mCDE.mFileName; }
+
+    /*
+     * Application-defined "mark".  Can be useful when synchronizing the
+     * contents of an archive with contents on disk.
+     */
+    bool getMarked(void) const { return mMarked; }
+    void setMarked(bool val) { mMarked = val; }
+
+    /*
+     * Some basic functions for raw data manipulation.  "LE" means
+     * Little Endian.
+     */
+    static inline unsigned short getShortLE(const unsigned char* buf) {
+        return buf[0] | (buf[1] << 8);
+    }
+    static inline unsigned long getLongLE(const unsigned char* buf) {
+        return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
+    }
+    static inline void putShortLE(unsigned char* buf, short val) {
+        buf[0] = (unsigned char) val;
+        buf[1] = (unsigned char) (val >> 8);
+    }
+    static inline void putLongLE(unsigned char* buf, long val) {
+        buf[0] = (unsigned char) val;
+        buf[1] = (unsigned char) (val >> 8);
+        buf[2] = (unsigned char) (val >> 16);
+        buf[3] = (unsigned char) (val >> 24);
+    }
+
+    /* defined for Zip archives */
+    enum {
+        kCompressStored     = 0,        // no compression
+        // shrunk           = 1,
+        // reduced 1        = 2,
+        // reduced 2        = 3,
+        // reduced 3        = 4,
+        // reduced 4        = 5,
+        // imploded         = 6,
+        // tokenized        = 7,
+        kCompressDeflated   = 8,        // standard deflate
+        // Deflate64        = 9,
+        // lib imploded     = 10,
+        // reserved         = 11,
+        // bzip2            = 12,
+    };
+
+    /*
+     * Deletion flag.  If set, the entry will be removed on the next
+     * call to "flush".
+     */
+    bool getDeleted(void) const { return mDeleted; }
+
+protected:
+    /*
+     * Initialize the structure from the file, which is pointing at
+     * our Central Directory entry.
+     */
+    status_t initFromCDE(FILE* fp);
+
+    /*
+     * Initialize the structure for a new file.  We need the filename
+     * and comment so that we can properly size the LFH area.  The
+     * filename is mandatory, the comment is optional.
+     */
+    void initNew(const char* fileName, const char* comment);
+
+    /*
+     * Initialize the structure with the contents of a ZipEntry from
+     * another file.
+     */
+    status_t initFromExternal(const ZipFile* pZipFile, const ZipEntry* pEntry);
+
+    /*
+     * Add some pad bytes to the LFH.  We do this by adding or resizing
+     * the "extra" field.
+     */
+    status_t addPadding(int padding);
+
+    /*
+     * Set information about the data for this entry.
+     */
+    void setDataInfo(long uncompLen, long compLen, unsigned long crc32,
+        int compressionMethod);
+
+    /*
+     * Set the modification date.
+     */
+    void setModWhen(time_t when);
+
+    /*
+     * Return the offset of the local file header.
+     */
+    off_t getLFHOffset(void) const { return mCDE.mLocalHeaderRelOffset; }
+
+    /*
+     * Set the offset of the local file header, relative to the start of
+     * the current file.
+     */
+    void setLFHOffset(off_t offset) {
+        mCDE.mLocalHeaderRelOffset = (long) offset;
+    }
+
+    /* mark for deletion; used by ZipFile::remove() */
+    void setDeleted(void) { mDeleted = true; }
+
+private:
+    /* these are private and not defined */
+    ZipEntry(const ZipEntry& src);
+    ZipEntry& operator=(const ZipEntry& src);
+
+    /* returns "true" if the CDE and the LFH agree */
+    bool compareHeaders(void) const;
+    void copyCDEtoLFH(void);
+
+    bool        mDeleted;       // set if entry is pending deletion
+    bool        mMarked;        // app-defined marker
+
+    /*
+     * Every entry in the Zip archive starts off with one of these.
+     */
+    class LocalFileHeader {
+    public:
+        LocalFileHeader(void) :
+            mVersionToExtract(0),
+            mGPBitFlag(0),
+            mCompressionMethod(0),
+            mLastModFileTime(0),
+            mLastModFileDate(0),
+            mCRC32(0),
+            mCompressedSize(0),
+            mUncompressedSize(0),
+            mFileNameLength(0),
+            mExtraFieldLength(0),
+            mFileName(NULL),
+            mExtraField(NULL)
+        {}
+        virtual ~LocalFileHeader(void) {
+            delete[] mFileName;
+            delete[] mExtraField;
+        }
+
+        status_t read(FILE* fp);
+        status_t write(FILE* fp);
+
+        // unsigned long mSignature;
+        unsigned short  mVersionToExtract;
+        unsigned short  mGPBitFlag;
+        unsigned short  mCompressionMethod;
+        unsigned short  mLastModFileTime;
+        unsigned short  mLastModFileDate;
+        unsigned long   mCRC32;
+        unsigned long   mCompressedSize;
+        unsigned long   mUncompressedSize;
+        unsigned short  mFileNameLength;
+        unsigned short  mExtraFieldLength;
+        unsigned char*  mFileName;
+        unsigned char*  mExtraField;
+
+        enum {
+            kSignature      = 0x04034b50,
+            kLFHLen         = 30,       // LocalFileHdr len, excl. var fields
+        };
+
+        void dump(void) const;
+    };
+
+    /*
+     * Every entry in the Zip archive has one of these in the "central
+     * directory" at the end of the file.
+     */
+    class CentralDirEntry {
+    public:
+        CentralDirEntry(void) :
+            mVersionMadeBy(0),
+            mVersionToExtract(0),
+            mGPBitFlag(0),
+            mCompressionMethod(0),
+            mLastModFileTime(0),
+            mLastModFileDate(0),
+            mCRC32(0),
+            mCompressedSize(0),
+            mUncompressedSize(0),
+            mFileNameLength(0),
+            mExtraFieldLength(0),
+            mFileCommentLength(0),
+            mDiskNumberStart(0),
+            mInternalAttrs(0),
+            mExternalAttrs(0),
+            mLocalHeaderRelOffset(0),
+            mFileName(NULL),
+            mExtraField(NULL),
+            mFileComment(NULL)
+        {}
+        virtual ~CentralDirEntry(void) {
+            delete[] mFileName;
+            delete[] mExtraField;
+            delete[] mFileComment;
+        }
+
+        status_t read(FILE* fp);
+        status_t write(FILE* fp);
+
+        // unsigned long mSignature;
+        unsigned short  mVersionMadeBy;
+        unsigned short  mVersionToExtract;
+        unsigned short  mGPBitFlag;
+        unsigned short  mCompressionMethod;
+        unsigned short  mLastModFileTime;
+        unsigned short  mLastModFileDate;
+        unsigned long   mCRC32;
+        unsigned long   mCompressedSize;
+        unsigned long   mUncompressedSize;
+        unsigned short  mFileNameLength;
+        unsigned short  mExtraFieldLength;
+        unsigned short  mFileCommentLength;
+        unsigned short  mDiskNumberStart;
+        unsigned short  mInternalAttrs;
+        unsigned long   mExternalAttrs;
+        unsigned long   mLocalHeaderRelOffset;
+        unsigned char*  mFileName;
+        unsigned char*  mExtraField;
+        unsigned char*  mFileComment;
+
+        void dump(void) const;
+
+        enum {
+            kSignature      = 0x02014b50,
+            kCDELen         = 46,       // CentralDirEnt len, excl. var fields
+        };
+    };
+
+    enum {
+        //kDataDescriptorSignature  = 0x08074b50,   // currently unused
+        kDataDescriptorLen  = 16,           // four 32-bit fields
+
+        kDefaultVersion     = 20,           // need deflate, nothing much else
+        kDefaultMadeBy      = 0x0317,       // 03=UNIX, 17=spec v2.3
+        kUsesDataDescr      = 0x0008,       // GPBitFlag bit 3
+    };
+
+    LocalFileHeader     mLFH;
+    CentralDirEntry     mCDE;
+};
+
+}; // namespace android
+
+#endif // __LIBS_ZIPENTRY_H
diff --git a/tools/zipalign/ZipFile.cpp b/tools/zipalign/ZipFile.cpp
new file mode 100644
index 0000000..62c9383
--- /dev/null
+++ b/tools/zipalign/ZipFile.cpp
@@ -0,0 +1,1297 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+//
+// Access to Zip archives.
+//
+
+#define LOG_TAG "zip"
+
+#include <utils/ZipUtils.h>
+#include <utils/Log.h>
+
+#include "ZipFile.h"
+
+#include <zlib.h>
+#define DEF_MEM_LEVEL 8                // normally in zutil.h?
+
+#include <memory.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <assert.h>
+
+using namespace android;
+
+/*
+ * Some environments require the "b", some choke on it.
+ */
+#define FILE_OPEN_RO        "rb"
+#define FILE_OPEN_RW        "r+b"
+#define FILE_OPEN_RW_CREATE "w+b"
+
+/* should live somewhere else? */
+static status_t errnoToStatus(int err)
+{
+    if (err == ENOENT)
+        return NAME_NOT_FOUND;
+    else if (err == EACCES)
+        return PERMISSION_DENIED;
+    else
+        return UNKNOWN_ERROR;
+}
+
+/*
+ * Open a file and parse its guts.
+ */
+status_t ZipFile::open(const char* zipFileName, int flags)
+{
+    bool newArchive = false;
+
+    assert(mZipFp == NULL);     // no reopen
+
+    if ((flags & kOpenTruncate))
+        flags |= kOpenCreate;           // trunc implies create
+
+    if ((flags & kOpenReadOnly) && (flags & kOpenReadWrite))
+        return INVALID_OPERATION;       // not both
+    if (!((flags & kOpenReadOnly) || (flags & kOpenReadWrite)))
+        return INVALID_OPERATION;       // not neither
+    if ((flags & kOpenCreate) && !(flags & kOpenReadWrite))
+        return INVALID_OPERATION;       // create requires write
+
+    if (flags & kOpenTruncate) {
+        newArchive = true;
+    } else {
+        newArchive = (access(zipFileName, F_OK) != 0);
+        if (!(flags & kOpenCreate) && newArchive) {
+            /* not creating, must already exist */
+            LOGD("File %s does not exist", zipFileName);
+            return NAME_NOT_FOUND;
+        }
+    }
+
+    /* open the file */
+    const char* openflags;
+    if (flags & kOpenReadWrite) {
+        if (newArchive)
+            openflags = FILE_OPEN_RW_CREATE;
+        else
+            openflags = FILE_OPEN_RW;
+    } else {
+        openflags = FILE_OPEN_RO;
+    }
+    mZipFp = fopen(zipFileName, openflags);
+    if (mZipFp == NULL) {
+        int err = errno;
+        LOGD("fopen failed: %d\n", err);
+        return errnoToStatus(err);
+    }
+
+    status_t result;
+    if (!newArchive) {
+        /*
+         * Load the central directory.  If that fails, then this probably
+         * isn't a Zip archive.
+         */
+        result = readCentralDir();
+    } else {
+        /*
+         * Newly-created.  The EndOfCentralDir constructor actually
+         * sets everything to be the way we want it (all zeroes).  We
+         * set mNeedCDRewrite so that we create *something* if the
+         * caller doesn't add any files.  (We could also just unlink
+         * the file if it's brand new and nothing was added, but that's
+         * probably doing more than we really should -- the user might
+         * have a need for empty zip files.)
+         */
+        mNeedCDRewrite = true;
+        result = NO_ERROR;
+    }
+
+    if (flags & kOpenReadOnly)
+        mReadOnly = true;
+    else
+        assert(!mReadOnly);
+
+    return result;
+}
+
+/*
+ * Return the Nth entry in the archive.
+ */
+ZipEntry* ZipFile::getEntryByIndex(int idx) const
+{
+    if (idx < 0 || idx >= (int) mEntries.size())
+        return NULL;
+
+    return mEntries[idx];
+}
+
+/*
+ * Find an entry by name.
+ */
+ZipEntry* ZipFile::getEntryByName(const char* fileName) const
+{
+    /*
+     * Do a stupid linear string-compare search.
+     *
+     * There are various ways to speed this up, especially since it's rare
+     * to intermingle changes to the archive with "get by name" calls.  We
+     * don't want to sort the mEntries vector itself, however, because
+     * it's used to recreate the Central Directory.
+     *
+     * (Hash table works, parallel list of pointers in sorted order is good.)
+     */
+    int idx;
+
+    for (idx = mEntries.size()-1; idx >= 0; idx--) {
+        ZipEntry* pEntry = mEntries[idx];
+        if (!pEntry->getDeleted() &&
+            strcmp(fileName, pEntry->getFileName()) == 0)
+        {
+            return pEntry;
+        }
+    }
+
+    return NULL;
+}
+
+/*
+ * Empty the mEntries vector.
+ */
+void ZipFile::discardEntries(void)
+{
+    int count = mEntries.size();
+
+    while (--count >= 0)
+        delete mEntries[count];
+
+    mEntries.clear();
+}
+
+
+/*
+ * Find the central directory and read the contents.
+ *
+ * The fun thing about ZIP archives is that they may or may not be
+ * readable from start to end.  In some cases, notably for archives
+ * that were written to stdout, the only length information is in the
+ * central directory at the end of the file.
+ *
+ * Of course, the central directory can be followed by a variable-length
+ * comment field, so we have to scan through it backwards.  The comment
+ * is at most 64K, plus we have 18 bytes for the end-of-central-dir stuff
+ * itself, plus apparently sometimes people throw random junk on the end
+ * just for the fun of it.
+ *
+ * This is all a little wobbly.  If the wrong value ends up in the EOCD
+ * area, we're hosed.  This appears to be the way that everbody handles
+ * it though, so we're in pretty good company if this fails.
+ */
+status_t ZipFile::readCentralDir(void)
+{
+    status_t result = NO_ERROR;
+    unsigned char* buf = NULL;
+    off_t fileLength, seekStart;
+    long readAmount;
+    int i;
+
+    fseek(mZipFp, 0, SEEK_END);
+    fileLength = ftell(mZipFp);
+    rewind(mZipFp);
+
+    /* too small to be a ZIP archive? */
+    if (fileLength < EndOfCentralDir::kEOCDLen) {
+        LOGD("Length is %ld -- too small\n", (long)fileLength);
+        result = INVALID_OPERATION;
+        goto bail;
+    }
+
+    buf = new unsigned char[EndOfCentralDir::kMaxEOCDSearch];
+    if (buf == NULL) {
+        LOGD("Failure allocating %d bytes for EOCD search",
+             EndOfCentralDir::kMaxEOCDSearch);
+        result = NO_MEMORY;
+        goto bail;
+    }
+
+    if (fileLength > EndOfCentralDir::kMaxEOCDSearch) {
+        seekStart = fileLength - EndOfCentralDir::kMaxEOCDSearch;
+        readAmount = EndOfCentralDir::kMaxEOCDSearch;
+    } else {
+        seekStart = 0;
+        readAmount = (long) fileLength;
+    }
+    if (fseek(mZipFp, seekStart, SEEK_SET) != 0) {
+        LOGD("Failure seeking to end of zip at %ld", (long) seekStart);
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    /* read the last part of the file into the buffer */
+    if (fread(buf, 1, readAmount, mZipFp) != (size_t) readAmount) {
+        LOGD("short file? wanted %ld\n", readAmount);
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    /* find the end-of-central-dir magic */
+    for (i = readAmount - 4; i >= 0; i--) {
+        if (buf[i] == 0x50 &&
+            ZipEntry::getLongLE(&buf[i]) == EndOfCentralDir::kSignature)
+        {
+            LOGV("+++ Found EOCD at buf+%d\n", i);
+            break;
+        }
+    }
+    if (i < 0) {
+        LOGD("EOCD not found, not Zip\n");
+        result = INVALID_OPERATION;
+        goto bail;
+    }
+
+    /* extract eocd values */
+    result = mEOCD.readBuf(buf + i, readAmount - i);
+    if (result != NO_ERROR) {
+        LOGD("Failure reading %ld bytes of EOCD values", readAmount - i);
+        goto bail;
+    }
+    //mEOCD.dump();
+
+    if (mEOCD.mDiskNumber != 0 || mEOCD.mDiskWithCentralDir != 0 ||
+        mEOCD.mNumEntries != mEOCD.mTotalNumEntries)
+    {
+        LOGD("Archive spanning not supported\n");
+        result = INVALID_OPERATION;
+        goto bail;
+    }
+
+    /*
+     * So far so good.  "mCentralDirSize" is the size in bytes of the
+     * central directory, so we can just seek back that far to find it.
+     * We can also seek forward mCentralDirOffset bytes from the
+     * start of the file.
+     *
+     * We're not guaranteed to have the rest of the central dir in the
+     * buffer, nor are we guaranteed that the central dir will have any
+     * sort of convenient size.  We need to skip to the start of it and
+     * read the header, then the other goodies.
+     *
+     * The only thing we really need right now is the file comment, which
+     * we're hoping to preserve.
+     */
+    if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
+        LOGD("Failure seeking to central dir offset %ld\n",
+             mEOCD.mCentralDirOffset);
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    /*
+     * Loop through and read the central dir entries.
+     */
+    LOGV("Scanning %d entries...\n", mEOCD.mTotalNumEntries);
+    int entry;
+    for (entry = 0; entry < mEOCD.mTotalNumEntries; entry++) {
+        ZipEntry* pEntry = new ZipEntry;
+
+        result = pEntry->initFromCDE(mZipFp);
+        if (result != NO_ERROR) {
+            LOGD("initFromCDE failed\n");
+            delete pEntry;
+            goto bail;
+        }
+
+        mEntries.add(pEntry);
+    }
+
+
+    /*
+     * If all went well, we should now be back at the EOCD.
+     */
+    {
+        unsigned char checkBuf[4];
+        if (fread(checkBuf, 1, 4, mZipFp) != 4) {
+            LOGD("EOCD check read failed\n");
+            result = INVALID_OPERATION;
+            goto bail;
+        }
+        if (ZipEntry::getLongLE(checkBuf) != EndOfCentralDir::kSignature) {
+            LOGD("EOCD read check failed\n");
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+        LOGV("+++ EOCD read check passed\n");
+    }
+
+bail:
+    delete[] buf;
+    return result;
+}
+
+
+/*
+ * Add a new file to the archive.
+ *
+ * This requires creating and populating a ZipEntry structure, and copying
+ * the data into the file at the appropriate position.  The "appropriate
+ * position" is the current location of the central directory, which we
+ * casually overwrite (we can put it back later).
+ *
+ * If we were concerned about safety, we would want to make all changes
+ * in a temp file and then overwrite the original after everything was
+ * safely written.  Not really a concern for us.
+ */
+status_t ZipFile::addCommon(const char* fileName, const void* data, size_t size,
+    const char* storageName, int sourceType, int compressionMethod,
+    ZipEntry** ppEntry)
+{
+    ZipEntry* pEntry = NULL;
+    status_t result = NO_ERROR;
+    long lfhPosn, startPosn, endPosn, uncompressedLen;
+    FILE* inputFp = NULL;
+    unsigned long crc;
+    time_t modWhen;
+
+    if (mReadOnly)
+        return INVALID_OPERATION;
+
+    assert(compressionMethod == ZipEntry::kCompressDeflated ||
+           compressionMethod == ZipEntry::kCompressStored);
+
+    /* make sure we're in a reasonable state */
+    assert(mZipFp != NULL);
+    assert(mEntries.size() == mEOCD.mTotalNumEntries);
+
+    /* make sure it doesn't already exist */
+    if (getEntryByName(storageName) != NULL)
+        return ALREADY_EXISTS;
+
+    if (!data) {
+        inputFp = fopen(fileName, FILE_OPEN_RO);
+        if (inputFp == NULL)
+            return errnoToStatus(errno);
+    }
+
+    if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
+        result = UNKNOWN_ERROR;
+        goto bail;
+    }
+
+    pEntry = new ZipEntry;
+    pEntry->initNew(storageName, NULL);
+
+    /*
+     * From here on out, failures are more interesting.
+     */
+    mNeedCDRewrite = true;
+
+    /*
+     * Write the LFH, even though it's still mostly blank.  We need it
+     * as a place-holder.  In theory the LFH isn't necessary, but in
+     * practice some utilities demand it.
+     */
+    lfhPosn = ftell(mZipFp);
+    pEntry->mLFH.write(mZipFp);
+    startPosn = ftell(mZipFp);
+
+    /*
+     * Copy the data in, possibly compressing it as we go.
+     */
+    if (sourceType == ZipEntry::kCompressStored) {
+        if (compressionMethod == ZipEntry::kCompressDeflated) {
+            bool failed = false;
+            result = compressFpToFp(mZipFp, inputFp, data, size, &crc);
+            if (result != NO_ERROR) {
+                LOGD("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) {
+                    LOGD("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
+                LOGD("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) {
+            LOGD("this isn't a deflated gzip file?");
+            result = UNKNOWN_ERROR;
+            goto bail;
+        }
+
+        result = copyPartialFpToFp(mZipFp, inputFp, compressedLen, NULL);
+        if (result != NO_ERROR) {
+            LOGD("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);
+    modWhen = getModTime(inputFp ? fileno(inputFp) : fileno(mZipFp));
+    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)
+    {
+        LOGW("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) {
+            LOGD("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)
+{
+    size_t count;
+
+    *pCRC32 = crc32(0L, Z_NULL, 0);
+    if (size > 0) {
+        *pCRC32 = crc32(*pCRC32, (const unsigned char*)data, size);
+        if (fwrite(data, 1, size, dstFp) != size) {
+            LOGD("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
+            LOGD("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) {
+            LOGD("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) {
+            LOGE("Installed zlib is not compatible with linked version (%s)\n",
+                ZLIB_VERSION);
+        } else {
+            LOGD("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) {
+            LOGV("+++ 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)) {
+                    LOGD("deflate read failed (errno=%d)\n", errno);
+                    goto z_bail;
+                }
+            }
+            if (getSize < kBufSize) {
+                LOGV("+++  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) {
+            LOGD("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))
+        {
+            LOGV("+++ writing %d bytes\n", (int) (zstream.next_out - outBuf));
+            if (fwrite(outBuf, 1, zstream.next_out - outBuf, dstFp) !=
+                (size_t)(zstream.next_out - outBuf))
+            {
+                LOGD("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) {
+        LOGW("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 */
+                LOGE("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) {
+                LOGD("filemove src seek %ld failed\n", (long) src);
+                return UNKNOWN_ERROR;
+            }
+
+            if (fread(readBuf, 1, getSize, fp) != getSize) {
+                LOGD("filemove read %ld off=%ld failed\n",
+                    (long) getSize, (long) src);
+                return UNKNOWN_ERROR;
+            }
+
+            if (fseek(fp, (long) dst, SEEK_SET) != 0) {
+                LOGD("filemove dst seek %ld failed\n", (long) dst);
+                return UNKNOWN_ERROR;
+            }
+
+            if (fwrite(readBuf, 1, getSize, fp) != getSize) {
+                LOGD("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) {
+        LOGD("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) {
+        LOGD("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 */
+        LOGD(" 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) {
+            LOGD("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
+{
+    LOGD(" EndOfCentralDir contents:\n");
+    LOGD("  diskNum=%u diskWCD=%u numEnt=%u totalNumEnt=%u\n",
+        mDiskNumber, mDiskWithCentralDir, mNumEntries, mTotalNumEntries);
+    LOGD("  centDirSize=%lu centDirOff=%lu commentLen=%u\n",
+        mCentralDirSize, mCentralDirOffset, mCommentLen);
+}
+
diff --git a/tools/zipalign/ZipFile.h b/tools/zipalign/ZipFile.h
new file mode 100644
index 0000000..dbbd072
--- /dev/null
+++ b/tools/zipalign/ZipFile.h
@@ -0,0 +1,270 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+//
+// General-purpose Zip archive access.  This class allows both reading and
+// writing to Zip archives, including deletion of existing entries.
+//
+#ifndef __LIBS_ZIPFILE_H
+#define __LIBS_ZIPFILE_H
+
+#include <utils/Vector.h>
+#include <utils/Errors.h>
+#include <stdio.h>
+
+#include "ZipEntry.h"
+
+namespace android {
+
+/*
+ * Manipulate a Zip archive.
+ *
+ * Some changes will not be visible in the until until "flush" is called.
+ *
+ * The correct way to update a file archive is to make all changes to a
+ * copy of the archive in a temporary file, and then unlink/rename over
+ * the original after everything completes.  Because we're only interested
+ * in using this for packaging, we don't worry about such things.  Crashing
+ * after making changes and before flush() completes could leave us with
+ * an unusable Zip archive.
+ */
+class ZipFile {
+public:
+    ZipFile(void)
+      : mZipFp(NULL), mReadOnly(false), mNeedCDRewrite(false)
+      {}
+    ~ZipFile(void) {
+        if (!mReadOnly)
+            flush();
+        if (mZipFp != NULL)
+            fclose(mZipFp);
+        discardEntries();
+    }
+
+    /*
+     * Open a new or existing archive.
+     */
+    typedef enum {
+        kOpenReadOnly   = 0x01,
+        kOpenReadWrite  = 0x02,
+        kOpenCreate     = 0x04,     // create if it doesn't exist
+        kOpenTruncate   = 0x08,     // if it exists, empty it
+    };
+    status_t open(const char* zipFileName, int flags);
+
+    /*
+     * Add a file to the end of the archive.  Specify whether you want the
+     * library to try to store it compressed.
+     *
+     * If "storageName" is specified, the archive will use that instead
+     * of "fileName".
+     *
+     * If there is already an entry with the same name, the call fails.
+     * Existing entries with the same name must be removed first.
+     *
+     * If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
+     */
+    status_t add(const char* fileName, int compressionMethod,
+        ZipEntry** ppEntry)
+    {
+        return add(fileName, fileName, compressionMethod, ppEntry);
+    }
+    status_t add(const char* fileName, const char* storageName,
+        int compressionMethod, ZipEntry** ppEntry)
+    {
+        return addCommon(fileName, NULL, 0, storageName,
+                         ZipEntry::kCompressStored,
+                         compressionMethod, ppEntry);
+    }
+
+    /*
+     * Add a file that is already compressed with gzip.
+     *
+     * If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
+     */
+    status_t addGzip(const char* fileName, const char* storageName,
+        ZipEntry** ppEntry)
+    {
+        return addCommon(fileName, NULL, 0, storageName,
+                         ZipEntry::kCompressDeflated,
+                         ZipEntry::kCompressDeflated, ppEntry);
+    }
+
+    /*
+     * Add a file from an in-memory data buffer.
+     *
+     * If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
+     */
+    status_t add(const void* data, size_t size, const char* storageName,
+        int compressionMethod, ZipEntry** ppEntry)
+    {
+        return addCommon(NULL, data, size, storageName,
+                         ZipEntry::kCompressStored,
+                         compressionMethod, ppEntry);
+    }
+
+    /*
+     * 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 add(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry,
+        int padding, ZipEntry** ppEntry);
+
+    /*
+     * Mark an entry as having been removed.  It is not actually deleted
+     * from the archive or our internal data structures until flush() is
+     * called.
+     */
+    status_t remove(ZipEntry* pEntry);
+
+    /*
+     * Flush changes.  If mNeedCDRewrite is set, this writes the central dir.
+     */
+    status_t flush(void);
+
+    /*
+     * Expand the data into the buffer provided.  The buffer must hold
+     * at least <uncompressed len> bytes.  Variation expands directly
+     * to a file.
+     *
+     * Returns "false" if an error was encountered in the compressed data.
+     */
+    //bool uncompress(const ZipEntry* pEntry, void* buf) const;
+    //bool uncompress(const ZipEntry* pEntry, FILE* fp) const;
+    void* uncompress(const ZipEntry* pEntry);
+
+    /*
+     * Get an entry, by name.  Returns NULL if not found.
+     *
+     * Does not return entries pending deletion.
+     */
+    ZipEntry* getEntryByName(const char* fileName) const;
+
+    /*
+     * Get the Nth entry in the archive.
+     *
+     * This will return an entry that is pending deletion.
+     */
+    int getNumEntries(void) const { return mEntries.size(); }
+    ZipEntry* getEntryByIndex(int idx) const;
+
+private:
+    /* these are private and not defined */
+    ZipFile(const ZipFile& src);
+    ZipFile& operator=(const ZipFile& src);
+
+    class EndOfCentralDir {
+    public:
+        EndOfCentralDir(void) :
+            mDiskNumber(0),
+            mDiskWithCentralDir(0),
+            mNumEntries(0),
+            mTotalNumEntries(0),
+            mCentralDirSize(0),
+            mCentralDirOffset(0),
+            mCommentLen(0),
+            mComment(NULL)
+            {}
+        virtual ~EndOfCentralDir(void) {
+            delete[] mComment;
+        }
+
+        status_t readBuf(const unsigned char* buf, int len);
+        status_t write(FILE* fp);
+
+        //unsigned long   mSignature;
+        unsigned short  mDiskNumber;
+        unsigned short  mDiskWithCentralDir;
+        unsigned short  mNumEntries;
+        unsigned short  mTotalNumEntries;
+        unsigned long   mCentralDirSize;
+        unsigned long   mCentralDirOffset;      // offset from first disk
+        unsigned short  mCommentLen;
+        unsigned char*  mComment;
+
+        enum {
+            kSignature      = 0x06054b50,
+            kEOCDLen        = 22,       // EndOfCentralDir len, excl. comment
+
+            kMaxCommentLen  = 65535,    // longest possible in ushort
+            kMaxEOCDSearch  = kMaxCommentLen + EndOfCentralDir::kEOCDLen,
+
+        };
+
+        void dump(void) const;
+    };
+
+
+    /* read all entries in the central dir */
+    status_t readCentralDir(void);
+
+    /* crunch deleted entries out */
+    status_t crunchArchive(void);
+
+    /* clean up mEntries */
+    void discardEntries(void);
+
+    /* common handler for all "add" functions */
+    status_t addCommon(const char* fileName, const void* data, size_t size,
+        const char* storageName, int sourceType, int compressionMethod,
+        ZipEntry** ppEntry);
+
+    /* copy all of "srcFp" into "dstFp" */
+    status_t copyFpToFp(FILE* dstFp, FILE* srcFp, unsigned long* pCRC32);
+    /* copy all of "data" into "dstFp" */
+    status_t copyDataToFp(FILE* dstFp,
+        const void* data, size_t size, unsigned long* pCRC32);
+    /* copy some of "srcFp" into "dstFp" */
+    status_t copyPartialFpToFp(FILE* dstFp, FILE* srcFp, long length,
+        unsigned long* pCRC32);
+    /* like memmove(), but on parts of a single file */
+    status_t filemove(FILE* fp, off_t dest, off_t src, size_t n);
+    /* compress all of "srcFp" into "dstFp", using Deflate */
+    status_t compressFpToFp(FILE* dstFp, FILE* srcFp,
+        const void* data, size_t size, unsigned long* pCRC32);
+
+    /* get modification date from a file descriptor */
+    time_t getModTime(int fd);
+
+    /*
+     * We use stdio FILE*, which gives us buffering but makes dealing
+     * with files >2GB awkward.  Until we support Zip64, we're fine.
+     */
+    FILE*           mZipFp;             // Zip file pointer
+
+    /* one of these per file */
+    EndOfCentralDir mEOCD;
+
+    /* did we open this read-only? */
+    bool            mReadOnly;
+
+    /* set this when we trash the central dir */
+    bool            mNeedCDRewrite;
+
+    /*
+     * One ZipEntry per entry in the zip file.  I'm using pointers instead
+     * of objects because it's easier than making operator= work for the
+     * classes and sub-classes.
+     */
+    Vector<ZipEntry*>   mEntries;
+};
+
+}; // namespace android
+
+#endif // __LIBS_ZIPFILE_H