/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Access to entries in a Zip archive.
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//
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#include "ZipEntry.h"
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <inttypes.h>
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using namespace android;
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#define LOG(...) fprintf(stderr, __VA_ARGS__)
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/* Jan 01 2008 */
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#define STATIC_DATE (28 << 9 | 1 << 5 | 1)
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#define STATIC_TIME 0
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/*
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* Initialize a new ZipEntry structure from a FILE* positioned at a
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* CentralDirectoryEntry. Rewrites the headers to remove the dynamic
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* timestamps.
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*
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* On exit, the file pointer will be at the start of the next CDE or
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* at the EOCD.
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*/
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status_t ZipEntry::initAndRewriteFromCDE(FILE* fp)
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{
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status_t result;
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long posn;
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/* read the CDE */
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result = mCDE.rewrite(fp);
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if (result != 0) {
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LOG("mCDE.rewrite failed\n");
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return result;
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}
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/* using the info in the CDE, go load up the LFH */
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posn = ftell(fp);
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if (fseek(fp, mCDE.mLocalHeaderRelOffset, SEEK_SET) != 0) {
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LOG("local header seek failed (%" PRIu32 ")\n",
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mCDE.mLocalHeaderRelOffset);
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return -1;
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}
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result = mLFH.rewrite(fp);
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if (result != 0) {
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LOG("mLFH.rewrite failed\n");
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return result;
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}
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if (fseek(fp, posn, SEEK_SET) != 0)
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return -1;
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return 0;
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}
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/*
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* ===========================================================================
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* ZipEntry::LocalFileHeader
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* ===========================================================================
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*/
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/*
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* Rewrite a local file header.
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*
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* On entry, "fp" points to the signature at the start of the header.
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*/
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status_t ZipEntry::LocalFileHeader::rewrite(FILE* fp)
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{
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uint8_t buf[kLFHLen];
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if (fread(buf, 1, kLFHLen, fp) != kLFHLen)
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return -1;
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if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
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LOG("whoops: didn't find expected signature\n");
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return -1;
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}
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ZipEntry::putShortLE(&buf[0x0a], STATIC_TIME);
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ZipEntry::putShortLE(&buf[0x0c], STATIC_DATE);
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if (fseek(fp, -kLFHLen, SEEK_CUR) != 0)
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return -1;
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if (fwrite(buf, 1, kLFHLen, fp) != kLFHLen)
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return -1;
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return 0;
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}
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/*
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* ===========================================================================
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* ZipEntry::CentralDirEntry
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* ===========================================================================
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*/
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/*
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* Read and rewrite the central dir entry that appears next in the file.
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*
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* On entry, "fp" should be positioned on the signature bytes for the
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* entry. On exit, "fp" will point at the signature word for the next
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* entry or for the EOCD.
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*/
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status_t ZipEntry::CentralDirEntry::rewrite(FILE* fp)
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{
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uint8_t buf[kCDELen];
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uint16_t fileNameLength, extraFieldLength, fileCommentLength;
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if (fread(buf, 1, kCDELen, fp) != kCDELen)
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return -1;
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if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
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LOG("Whoops: didn't find expected signature\n");
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return -1;
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}
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ZipEntry::putShortLE(&buf[0x0c], STATIC_TIME);
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ZipEntry::putShortLE(&buf[0x0e], STATIC_DATE);
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fileNameLength = ZipEntry::getShortLE(&buf[0x1c]);
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extraFieldLength = ZipEntry::getShortLE(&buf[0x1e]);
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fileCommentLength = ZipEntry::getShortLE(&buf[0x20]);
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mLocalHeaderRelOffset = ZipEntry::getLongLE(&buf[0x2a]);
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if (fseek(fp, -kCDELen, SEEK_CUR) != 0)
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return -1;
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if (fwrite(buf, 1, kCDELen, fp) != kCDELen)
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return -1;
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if (fseek(fp, fileNameLength + extraFieldLength + fileCommentLength, SEEK_CUR) != 0)
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return -1;
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return 0;
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}
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