auto import from //depot/cupcake/@135843

7 files changed, 791 insertions, 0 deletions

diff --git a/libzipfile/Android.mk b/libzipfile/Android.mk
new file mode 100644
index 000000000..d2d758cc2
--- /dev/null
+++ b/libzipfile/Android.mk
@@ -0,0 +1,48 @@
+LOCAL_PATH:= $(call my-dir)
+
+# build host static library
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	centraldir.c \
+	zipfile.c
+
+LOCAL_STATIC_LIBRARIES := \
+	libunz
+
+LOCAL_MODULE:= libzipfile
+
+LOCAL_C_INCLUDES += external/zlib
+
+include $(BUILD_HOST_STATIC_LIBRARY)
+
+# build device static library
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	centraldir.c \
+	zipfile.c
+
+LOCAL_STATIC_LIBRARIES := \
+	libunz
+
+LOCAL_MODULE:= libzipfile
+
+LOCAL_C_INCLUDES += external/zlib
+
+include $(BUILD_STATIC_LIBRARY)
+
+
+# build test_zipfile
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	test_zipfile.c
+
+LOCAL_STATIC_LIBRARIES := libzipfile libunz
+
+LOCAL_MODULE := test_zipfile
+
+LOCAL_C_INCLUDES += external/zlib
+
+include $(BUILD_HOST_EXECUTABLE)
diff --git a/libzipfile/MODULE_LICENSE_APACHE2 b/libzipfile/MODULE_LICENSE_APACHE2
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/libzipfile/MODULE_LICENSE_APACHE2
diff --git a/libzipfile/NOTICE b/libzipfile/NOTICE
new file mode 100644
index 000000000..c5b1efa7a
--- /dev/null
+++ b/libzipfile/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (c) 2005-2008, 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.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+
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+      transformation or translation of a Source form, including but
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+
+      "Work" shall mean the work of authorship, whether in Source or
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+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
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+
+      (d) If the Work includes a "NOTICE" text file as part of its
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+          of the following places: within a NOTICE text file distributed
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+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
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+          that such additional attribution notices cannot be construed
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
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+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
diff --git a/libzipfile/centraldir.c b/libzipfile/centraldir.c
new file mode 100644
index 000000000..4387cebaa
--- /dev/null
+++ b/libzipfile/centraldir.c
@@ -0,0 +1,256 @@
+#include "private.h"

+#include <stdio.h>

+#include <string.h>

+#include <stdlib.h>

+

+enum {

+    // finding the directory

+    CD_SIGNATURE = 0x06054b50,

+    EOCD_LEN     = 22,        // EndOfCentralDir len, excl. comment

+    MAX_COMMENT_LEN = 65535,

+    MAX_EOCD_SEARCH = MAX_COMMENT_LEN + EOCD_LEN,

+

+    // central directory entries

+    ENTRY_SIGNATURE = 0x02014b50,

+    ENTRY_LEN = 46,          // CentralDirEnt len, excl. var fields

+    

+    // local file header

+    LFH_SIZE = 30,

+};

+

+unsigned int

+read_le_int(const unsigned char* buf)

+{

+    return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);

+}

+

+unsigned int

+read_le_short(const unsigned char* buf)

+{

+    return buf[0] | (buf[1] << 8);

+}

+

+static int

+read_central_dir_values(Zipfile* file, const unsigned char* buf, int len)

+{

+    if (len < EOCD_LEN) {

+        // looks like ZIP file got truncated

+        fprintf(stderr, " Zip EOCD: expected >= %d bytes, found %d\n",

+                EOCD_LEN, len);

+        return -1;

+    }

+

+    file->disknum = read_le_short(&buf[0x04]);

+    file->diskWithCentralDir = read_le_short(&buf[0x06]);

+    file->entryCount = read_le_short(&buf[0x08]);

+    file->totalEntryCount = read_le_short(&buf[0x0a]);

+    file->centralDirSize = read_le_int(&buf[0x0c]);

+    file->centralDirOffest = read_le_int(&buf[0x10]);

+    file->commentLen = read_le_short(&buf[0x14]);

+

+    if (file->commentLen > 0) {

+        if (EOCD_LEN + file->commentLen > len) {

+            fprintf(stderr, "EOCD(%d) + comment(%d) exceeds len (%d)\n",

+                    EOCD_LEN, file->commentLen, len);

+            return -1;

+        }

+        file->comment = buf + EOCD_LEN;

+    }

+

+    return 0;

+}

+

+static int

+read_central_directory_entry(Zipfile* file, Zipentry* entry,

+                const unsigned char** buf, ssize_t* len)

+{

+    const unsigned char* p;

+

+    unsigned short  versionMadeBy;

+    unsigned short  versionToExtract;

+    unsigned short  gpBitFlag;

+    unsigned short  compressionMethod;

+    unsigned short  lastModFileTime;

+    unsigned short  lastModFileDate;

+    unsigned long   crc32;

+    unsigned long   compressedSize;

+    unsigned long   uncompressedSize;

+    unsigned short  extraFieldLength;

+    unsigned short  fileCommentLength;

+    unsigned short  diskNumberStart;

+    unsigned short  internalAttrs;

+    unsigned long   externalAttrs;

+    unsigned long   localHeaderRelOffset;

+    const unsigned char*  extraField;

+    const unsigned char*  fileComment;

+    unsigned int dataOffset;

+    unsigned short lfhExtraFieldSize;

+    

+

+    p = *buf;

+

+    if (*len < ENTRY_LEN) {

+        fprintf(stderr, "cde entry not large enough\n");

+        return -1;

+    }

+

+    if (read_le_int(&p[0x00]) != ENTRY_SIGNATURE) {

+        fprintf(stderr, "Whoops: didn't find expected signature\n");

+        return -1;

+    }

+

+    versionMadeBy = read_le_short(&p[0x04]);

+    versionToExtract = read_le_short(&p[0x06]);

+    gpBitFlag = read_le_short(&p[0x08]);

+    entry->compressionMethod = read_le_short(&p[0x0a]);

+    lastModFileTime = read_le_short(&p[0x0c]);

+    lastModFileDate = read_le_short(&p[0x0e]);

+    crc32 = read_le_int(&p[0x10]);

+    compressedSize = read_le_int(&p[0x14]);

+    entry->uncompressedSize = read_le_int(&p[0x18]);

+    entry->fileNameLength = read_le_short(&p[0x1c]);

+    extraFieldLength = read_le_short(&p[0x1e]);

+    fileCommentLength = read_le_short(&p[0x20]);

+    diskNumberStart = read_le_short(&p[0x22]);

+    internalAttrs = read_le_short(&p[0x24]);

+    externalAttrs = read_le_int(&p[0x26]);

+    localHeaderRelOffset = read_le_int(&p[0x2a]);

+

+    p += ENTRY_LEN;

+

+    // filename

+    if (entry->fileNameLength != 0) {

+        entry->fileName = p;

+    } else {

+        entry->fileName = NULL;

+    }

+    p += entry->fileNameLength;

+

+    // extra field

+    if (extraFieldLength != 0) {

+        extraField = p;

+    } else {

+        extraField = NULL;

+    }

+    p += extraFieldLength;

+

+    // comment, if any

+    if (fileCommentLength != 0) {

+        fileComment = p;

+    } else {

+        fileComment = NULL;

+    }

+    p += fileCommentLength;

+    

+    *buf = p;

+

+    // the size of the extraField in the central dir is how much data there is,

+    // but the one in the local file header also contains some padding.

+    p = file->buf + localHeaderRelOffset;

+    extraFieldLength = read_le_short(&p[0x1c]);

+    

+    dataOffset = localHeaderRelOffset + LFH_SIZE

+        + entry->fileNameLength + extraFieldLength;

+    entry->data = file->buf + dataOffset;

+#if 0

+    printf("file->buf=%p entry->data=%p dataOffset=%x localHeaderRelOffset=%d "

+           "entry->fileNameLength=%d extraFieldLength=%d\n",

+           file->buf, entry->data, dataOffset, localHeaderRelOffset,

+           entry->fileNameLength, extraFieldLength);

+#endif

+    return 0;

+}

+

+/*

+ * 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.

+ */

+int

+read_central_dir(Zipfile *file)

+{

+    int err;

+

+    const unsigned char* buf = file->buf;

+    ssize_t bufsize = file->bufsize;

+    const unsigned char* eocd;

+    const unsigned char* p;

+    const unsigned char* start;

+    ssize_t len;

+    int i;

+

+    // too small to be a ZIP archive?

+    if (bufsize < EOCD_LEN) {

+        fprintf(stderr, "Length is %d -- too small\n", bufsize);

+        goto bail;

+    }

+

+    // find the end-of-central-dir magic

+    if (bufsize > MAX_EOCD_SEARCH) {

+        start = buf + bufsize - MAX_EOCD_SEARCH;

+    } else {

+        start = buf;

+    }

+    p = buf + bufsize - 4;

+    while (p >= start) {

+        if (*p == 0x50 && read_le_int(p) == CD_SIGNATURE) {

+            eocd = p;

+            break;

+        }

+        p--;

+    }

+    if (p < start) {

+        fprintf(stderr, "EOCD not found, not Zip\n");

+        goto bail;

+    }

+

+    // extract eocd values

+    err = read_central_dir_values(file, eocd, (buf+bufsize)-eocd);

+    if (err != 0) {

+        goto bail;

+    }

+

+    if (file->disknum != 0

+          || file->diskWithCentralDir != 0

+          || file->entryCount != file->totalEntryCount) {

+        fprintf(stderr, "Archive spanning not supported\n");

+        goto bail;

+    }

+

+    // Loop through and read the central dir entries.

+    p = buf + file->centralDirOffest;

+    len = (buf+bufsize)-p;

+    for (i=0; i < file->totalEntryCount; i++) {

+        Zipentry* entry = malloc(sizeof(Zipentry));

+        memset(entry, sizeof(Zipentry), 0);

+

+        err = read_central_directory_entry(file, entry, &p, &len);

+        if (err != 0) {

+            fprintf(stderr, "read_central_directory_entry failed\n");

+            free(entry);

+            goto bail;

+        }

+        

+        // add it to our list

+        entry->next = file->entries;

+        file->entries = entry;

+    }

+

+    return 0;

+bail:

+    return -1;

+}

+

diff --git a/libzipfile/private.h b/libzipfile/private.h
new file mode 100644
index 000000000..06f788dd6
--- /dev/null
+++ b/libzipfile/private.h
@@ -0,0 +1,45 @@
+#ifndef PRIVATE_H

+#define PRIVATE_H

+

+#include <stddef.h>

+#include <stdint.h>

+#include <stdio.h>

+#include <string.h>

+#include <stdlib.h>

+

+typedef struct Zipentry {

+    unsigned long fileNameLength;

+    const unsigned char* fileName;

+    unsigned short compressionMethod;

+    unsigned int uncompressedSize;

+    unsigned int compressedSize;

+    const unsigned char* data;

+    

+    struct Zipentry* next;

+} Zipentry;

+

+typedef struct Zipfile

+{

+    const unsigned char *buf;

+    ssize_t bufsize;

+

+    // Central directory

+    unsigned short  disknum;            //mDiskNumber;

+    unsigned short  diskWithCentralDir; //mDiskWithCentralDir;

+    unsigned short  entryCount;         //mNumEntries;

+    unsigned short  totalEntryCount;    //mTotalNumEntries;

+    unsigned int    centralDirSize;     //mCentralDirSize;

+    unsigned int    centralDirOffest;  // offset from first disk  //mCentralDirOffset;

+    unsigned short  commentLen;         //mCommentLen;

+    const unsigned char*  comment;            //mComment;

+

+    Zipentry* entries;

+} Zipfile;

+

+int read_central_dir(Zipfile* file);

+

+unsigned int read_le_int(const unsigned char* buf);

+unsigned int read_le_short(const unsigned char* buf);

+

+#endif // PRIVATE_H

+

diff --git a/libzipfile/test_zipfile.c b/libzipfile/test_zipfile.c
new file mode 100644
index 000000000..40840ec20
--- /dev/null
+++ b/libzipfile/test_zipfile.c
@@ -0,0 +1,92 @@
+#include <zipfile/zipfile.h>

+

+#include <stdio.h>

+#include <stdlib.h>

+

+void dump_zipfile(FILE* to, zipfile_t file);

+

+int

+main(int argc, char** argv)

+{

+    FILE* f;

+    size_t size, unsize;

+    void* buf;

+    void* scratch;

+    zipfile_t zip;

+    zipentry_t entry;

+    int err;

+    enum { HUH, LIST, UNZIP } what = HUH;

+

+    if (strcmp(argv[2], "-l") == 0 && argc == 3) {

+        what = LIST;

+    }

+    else if (strcmp(argv[2], "-u") == 0 && argc == 5) {

+        what = UNZIP;

+    }

+    else {

+        fprintf(stderr, "usage: test_zipfile ZIPFILE -l\n"

+                        "          lists the files in the zipfile\n"

+                        "       test_zipfile ZIPFILE -u FILENAME SAVETO\n"

+                        "          saves FILENAME from the zip file into SAVETO\n");

+        return 1;

+    }

+    

+    f = fopen(argv[1], "r");

+    if (f == NULL) {

+        fprintf(stderr, "couldn't open %s\n", argv[1]);

+        return 1;

+    }

+

+    fseek(f, 0, SEEK_END);

+    size = ftell(f);

+    rewind(f);

+    

+    buf = malloc(size);

+    fread(buf, 1, size, f);

+

+    zip = init_zipfile(buf, size);

+    if (zip == NULL) {

+        fprintf(stderr, "inti_zipfile failed\n");

+        return 1;

+    }

+

+    fclose(f);

+

+

+    switch (what)

+    {

+        case LIST:

+            dump_zipfile(stdout, zip);

+            break;

+        case UNZIP:

+            entry = lookup_zipentry(zip, argv[3]);

+            if (entry == NULL) {

+                fprintf(stderr, "zip file '%s' does not contain file '%s'\n",

+                                argv[1], argv[1]);

+                return 1;

+            }

+            f = fopen(argv[4], "w");

+            if (f == NULL) {

+                fprintf(stderr, "can't open file for writing '%s'\n", argv[4]);

+                return 1;

+            }

+            unsize = get_zipentry_size(entry);

+            size = unsize * 1.001;

+            scratch = malloc(size);

+            printf("scratch=%p\n", scratch);

+            err = decompress_zipentry(entry, scratch, size);

+            if (err != 0) {

+                fprintf(stderr, "error decompressing file\n");

+                return 1;

+            }

+            fwrite(scratch, unsize, 1, f);

+            free(scratch);

+            fclose(f);

+            break;

+    }

+    

+    free(buf);

+

+    return 0;

+}

+

diff --git a/libzipfile/zipfile.c b/libzipfile/zipfile.c
new file mode 100644
index 000000000..b52d02df7
--- /dev/null
+++ b/libzipfile/zipfile.c
@@ -0,0 +1,160 @@
+#include <zipfile/zipfile.h>
+
+#include "private.h"
+#include <stdlib.h>
+#include <string.h>
+#include <zlib.h>
+#define DEF_MEM_LEVEL 8                // normally in zutil.h?
+
+zipfile_t
+init_zipfile(const void* data, size_t size)
+{
+    int err;
+
+    Zipfile *file = malloc(sizeof(Zipfile));
+    if (file == NULL) return NULL;
+    memset(file, 0, sizeof(Zipfile));
+    file->buf = data;
+    file->bufsize = size;
+
+    err = read_central_dir(file);
+    if (err != 0) goto fail;
+
+    return file;
+fail:
+    free(file);
+    return NULL;
+}
+
+void
+release_zipfile(zipfile_t f)
+{
+    Zipfile* file = (Zipfile*)f;
+    Zipentry* entry = file->entries;
+    while (entry) {
+        Zipentry* next = entry->next;
+        free(entry);
+        entry = next;
+    }
+    free(file);
+}
+
+zipentry_t
+lookup_zipentry(zipfile_t f, const char* entryName)
+{
+    Zipfile* file = (Zipfile*)f;
+    Zipentry* entry = file->entries;
+    while (entry) {
+        if (0 == memcmp(entryName, entry->fileName, entry->fileNameLength)) {
+            return entry;
+        }
+        entry = entry->next;
+    }
+    return NULL;
+}
+
+size_t
+get_zipentry_size(zipentry_t entry)
+{
+    return ((Zipentry*)entry)->uncompressedSize;
+}
+
+char*
+get_zipentry_name(zipentry_t entry)
+{
+    Zipentry* e = (Zipentry*)entry;
+    int l = e->fileNameLength;
+    char* s = malloc(l+1);
+    memcpy(s, e->fileName, l);
+    s[l] = '\0';
+    return s;
+}
+
+enum {
+    STORED = 0,
+    DEFLATED = 8
+};
+
+static int
+uninflate(unsigned char* out, int unlen, const unsigned char* in, int clen)
+{
+    z_stream zstream;
+    unsigned long crc;
+    int err = 0;
+    int zerr;
+    
+    memset(&zstream, 0, sizeof(zstream));
+    zstream.zalloc = Z_NULL;
+    zstream.zfree = Z_NULL;
+    zstream.opaque = Z_NULL;
+    zstream.next_in = (void*)in;
+    zstream.avail_in = unlen;
+    zstream.next_out = (Bytef*) out;
+    zstream.avail_out = unlen;
+    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) {
+        return -1;
+    }
+    
+    // uncompress the data
+    zerr = inflate(&zstream, Z_FINISH);
+    if (zerr != Z_STREAM_END) {
+        fprintf(stderr, "zerr=%d Z_STREAM_END=%d total_out=%lu\n", zerr, Z_STREAM_END,
+                    zstream.total_out);
+        err = -1;
+    }
+    
+     inflateEnd(&zstream);
+    return err;
+}
+
+int
+decompress_zipentry(zipentry_t e, void* buf, int bufsize)
+{
+    Zipentry* entry = (Zipentry*)e;
+    switch (entry->compressionMethod)
+    {
+        case STORED:
+            memcpy(buf, entry->data, entry->uncompressedSize);
+            return 0;
+        case DEFLATED:
+            return uninflate(buf, bufsize, entry->data, entry->compressedSize);
+        default:
+            return -1;
+    }
+}
+
+void
+dump_zipfile(FILE* to, zipfile_t file)
+{
+    Zipfile* zip = (Zipfile*)file;
+    Zipentry* entry = zip->entries;
+    int i;
+
+    fprintf(to, "entryCount=%d\n", zip->entryCount);
+    for (i=0; i<zip->entryCount; i++) {
+        fprintf(to, "  file \"");
+        fwrite(entry->fileName, entry->fileNameLength, 1, to);
+        fprintf(to, "\"\n");
+        entry = entry->next;
+    }
+}
+
+zipentry_t
+iterate_zipfile(zipfile_t file, void** cookie)
+{
+    Zipentry* entry = (Zipentry*)*cookie;
+    if (entry == NULL) {
+        Zipfile* zip = (Zipfile*)file;
+        *cookie = zip->entries;
+        return *cookie;
+    } else {
+        entry = entry->next;
+        *cookie = entry;
+        return entry;
+    }
+}