Merge "Remove libzipfile."

/*

 * Copyright (C) 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.

 * 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.

 */

#ifndef _ZIPFILE_ZIPFILE_H

#define _ZIPFILE_ZIPFILE_H

#include <stddef.h>

#ifdef __cplusplus

extern "C" {

#endif

typedef void* zipfile_t;

typedef void* zipentry_t;

// Provide a buffer.  Returns NULL on failure.

zipfile_t init_zipfile(const void* data, size_t size);

// Release the zipfile resources.

void release_zipfile(zipfile_t file);

// Get a named entry object.  Returns NULL if it doesn't exist

// or if we won't be able to decompress it.  The zipentry_t is

// freed by release_zipfile()

zipentry_t lookup_zipentry(zipfile_t file, const char* entryName);

// Return the size of the entry.

size_t get_zipentry_size(zipentry_t entry);

// return the filename of this entry, you own the memory returned

char* get_zipentry_name(zipentry_t entry);

// The buffer must be 1.001 times the buffer size returned

// by get_zipentry_size.  Returns nonzero on failure.

int decompress_zipentry(zipentry_t entry, void* buf, int bufsize);

// iterate through the entries in the zip file.  pass a pointer to

// a void* initialized to NULL to start.  Returns NULL when done

zipentry_t iterate_zipfile(zipfile_t file, void** cookie);

#ifdef __cplusplus

} // extern "C"

#endif

#endif // _ZIPFILE_ZIPFILE_H

LOCAL_PATH:= $(call my-dir)

# build host static library

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \

	centraldir.c \

	zipfile.c

LOCAL_STATIC_LIBRARIES := libz

LOCAL_MODULE:= libzipfile

LOCAL_CFLAGS := -Werror

LOCAL_MULTILIB := both

include $(BUILD_HOST_STATIC_LIBRARY)

# build device static library

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \

	centraldir.c \

	zipfile.c

LOCAL_STATIC_LIBRARIES := libz

LOCAL_MODULE:= libzipfile

LOCAL_CFLAGS := -Werror

include $(BUILD_STATIC_LIBRARY)

# build test_zipfile

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \

	test_zipfile.c

LOCAL_STATIC_LIBRARIES := libzipfile libz

LOCAL_MODULE := test_zipfile

LOCAL_CFLAGS := -Werror

include $(BUILD_HOST_EXECUTABLE)

   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.

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   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.

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#include "private.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <utils/Compat.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  extraFieldLength;

    unsigned short  fileCommentLength;

    unsigned long   localHeaderRelOffset;

    unsigned int dataOffset;

    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;

    }

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

    entry->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]);

    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

    p += extraFieldLength;

    // comment, if any

    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;

    ZD_TYPE 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 " ZD " -- 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, 0, sizeof(Zipentry));

        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;

}