/*
* 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.
*/
/*
* Zip alignment tool
*/
#include "ZipFile.h"
#include <stdlib.h>
#include <stdio.h>
using namespace android;
/*
* Show program usage.
*/
void usage(void)
{
fprintf(stderr, "Zip alignment utility\n");
fprintf(stderr, "Copyright (C) 2009 The Android Open Source Project\n\n");
fprintf(stderr,
"Usage: zipalign [-f] [-p] [-v] [-z] <align> infile.zip outfile.zip\n"
" zipalign -c [-v] <align> infile.zip\n\n" );
fprintf(stderr,
" <align>: alignment in bytes, e.g. '4' provides 32-bit alignment\n");
fprintf(stderr, " -c: check alignment only (does not modify file)\n");
fprintf(stderr, " -f: overwrite existing outfile.zip\n");
fprintf(stderr, " -p: page align stored shared object files\n");
fprintf(stderr, " -v: verbose output\n");
fprintf(stderr, " -z: recompress using Zopfli\n");
}
static int getAlignment(bool pageAlignSharedLibs, int defaultAlignment,
ZipEntry* pEntry) {
static const int kPageAlignment = 4096;
if (!pageAlignSharedLibs) {
return defaultAlignment;
}
const char* ext = strrchr(pEntry->getFileName(), '.');
if (ext && strcmp(ext, ".so") == 0) {
return kPageAlignment;
}
return defaultAlignment;
}
/*
* Copy all entries from "pZin" to "pZout", aligning as needed.
*/
static int copyAndAlign(ZipFile* pZin, ZipFile* pZout, int alignment, bool zopfli,
bool pageAlignSharedLibs)
{
int numEntries = pZin->getNumEntries();
ZipEntry* pEntry;
int bias = 0;
status_t status;
for (int i = 0; i < numEntries; i++) {
ZipEntry* pNewEntry;
int padding = 0;
pEntry = pZin->getEntryByIndex(i);
if (pEntry == NULL) {
fprintf(stderr, "ERROR: unable to retrieve entry %d\n", i);
return 1;
}
if (pEntry->isCompressed()) {
/* copy the entry without padding */
//printf("--- %s: orig at %ld len=%ld (compressed)\n",
// pEntry->getFileName(), (long) pEntry->getFileOffset(),
// (long) pEntry->getUncompressedLen());
if (zopfli) {
status = pZout->addRecompress(pZin, pEntry, &pNewEntry);
bias += pNewEntry->getCompressedLen() - pEntry->getCompressedLen();
} else {
status = pZout->add(pZin, pEntry, padding, &pNewEntry);
}
} else {
const int alignTo = getAlignment(pageAlignSharedLibs, alignment, pEntry);
/*
* Copy the entry, adjusting as required. We assume that the
* file position in the new file will be equal to the file
* position in the original.
*/
long newOffset = pEntry->getFileOffset() + bias;
padding = (alignTo - (newOffset % alignTo)) % alignTo;
//printf("--- %s: orig at %ld(+%d) len=%ld, adding pad=%d\n",
// pEntry->getFileName(), (long) pEntry->getFileOffset(),
// bias, (long) pEntry->getUncompressedLen(), padding);
status = pZout->add(pZin, pEntry, padding, &pNewEntry);
}
if (status != NO_ERROR)
return 1;
bias += padding;
//printf(" added '%s' at %ld (pad=%d)\n",
// pNewEntry->getFileName(), (long) pNewEntry->getFileOffset(),
// padding);
}
return 0;
}
/*
* Process a file. We open the input and output files, failing if the
* output file exists and "force" wasn't specified.
*/
static int process(const char* inFileName, const char* outFileName,
int alignment, bool force, bool zopfli, bool pageAlignSharedLibs)
{
ZipFile zin, zout;
//printf("PROCESS: align=%d in='%s' out='%s' force=%d\n",
// alignment, inFileName, outFileName, force);
/* this mode isn't supported -- do a trivial check */
if (strcmp(inFileName, outFileName) == 0) {
fprintf(stderr, "Input and output can't be same file\n");
return 1;
}
/* don't overwrite existing unless given permission */
if (!force && access(outFileName, F_OK) == 0) {
fprintf(stderr, "Output file '%s' exists\n", outFileName);
return 1;
}
if (zin.open(inFileName, ZipFile::kOpenReadOnly) != NO_ERROR) {
fprintf(stderr, "Unable to open '%s' as zip archive\n", inFileName);
return 1;
}
if (zout.open(outFileName,
ZipFile::kOpenReadWrite|ZipFile::kOpenCreate|ZipFile::kOpenTruncate)
!= NO_ERROR)
{
fprintf(stderr, "Unable to open '%s' as zip archive\n", outFileName);
return 1;
}
int result = copyAndAlign(&zin, &zout, alignment, zopfli, pageAlignSharedLibs);
if (result != 0) {
printf("zipalign: failed rewriting '%s' to '%s'\n",
inFileName, outFileName);
}
return result;
}
/*
* Verify the alignment of a zip archive.
*/
static int verify(const char* fileName, int alignment, bool verbose,
bool pageAlignSharedLibs)
{
ZipFile zipFile;
bool foundBad = false;
if (verbose)
printf("Verifying alignment of %s (%d)...\n", fileName, alignment);
if (zipFile.open(fileName, ZipFile::kOpenReadOnly) != NO_ERROR) {
fprintf(stderr, "Unable to open '%s' for verification\n", fileName);
return 1;
}
int numEntries = zipFile.getNumEntries();
ZipEntry* pEntry;
for (int i = 0; i < numEntries; i++) {
pEntry = zipFile.getEntryByIndex(i);
if (pEntry->isCompressed()) {
if (verbose) {
printf("%8ld %s (OK - compressed)\n",
(long) pEntry->getFileOffset(), pEntry->getFileName());
}
} else {
long offset = pEntry->getFileOffset();
const int alignTo = getAlignment(pageAlignSharedLibs, alignment, pEntry);
if ((offset % alignTo) != 0) {
if (verbose) {
printf("%8ld %s (BAD - %ld)\n",
(long) offset, pEntry->getFileName(),
offset % alignTo);
}
foundBad = true;
} else {
if (verbose) {
printf("%8ld %s (OK)\n",
(long) offset, pEntry->getFileName());
}
}
}
}
if (verbose)
printf("Verification %s\n", foundBad ? "FAILED" : "succesful");
return foundBad ? 1 : 0;
}
/*
* Parse args.
*/
int main(int argc, char* const argv[])
{
bool wantUsage = false;
bool check = false;
bool force = false;
bool verbose = false;
bool zopfli = false;
bool pageAlignSharedLibs = false;
int result = 1;
int alignment;
char* endp;
if (argc < 4) {
wantUsage = true;
goto bail;
}
argc--;
argv++;
while (argc && argv[0][0] == '-') {
const char* cp = argv[0] +1;
while (*cp != '\0') {
switch (*cp) {
case 'c':
check = true;
break;
case 'f':
force = true;
break;
case 'v':
verbose = true;
break;
case 'z':
zopfli = true;
break;
case 'p':
pageAlignSharedLibs = true;
break;
default:
fprintf(stderr, "ERROR: unknown flag -%c\n", *cp);
wantUsage = true;
goto bail;
}
cp++;
}
argc--;
argv++;
}
if (!((check && argc == 2) || (!check && argc == 3))) {
wantUsage = true;
goto bail;
}
alignment = strtol(argv[0], &endp, 10);
if (*endp != '\0' || alignment <= 0) {
fprintf(stderr, "Invalid value for alignment: %s\n", argv[0]);
wantUsage = true;
goto bail;
}
if (check) {
/* check existing archive for correct alignment */
result = verify(argv[1], alignment, verbose, pageAlignSharedLibs);
} else {
/* create the new archive */
result = process(argv[1], argv[2], alignment, force, zopfli, pageAlignSharedLibs);
/* trust, but verify */
if (result == 0) {
result = verify(argv[2], alignment, verbose, pageAlignSharedLibs);
}
}
bail:
if (wantUsage) {
usage();
result = 2;
}
return result;
}