345 lines
9.4 KiB
C++
345 lines
9.4 KiB
C++
/*
|
|
* Copyright (C) 2007 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.
|
|
*/
|
|
|
|
//
|
|
// Misc zip/gzip utility functions.
|
|
//
|
|
|
|
#define LOG_TAG "ziputil"
|
|
|
|
#include <utils/ZipUtils.h>
|
|
#include <utils/ZipFileRO.h>
|
|
#include <utils/Log.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
|
|
#include <zlib.h>
|
|
|
|
using namespace android;
|
|
|
|
/*
|
|
* Utility function that expands zip/gzip "deflate" compressed data
|
|
* into a buffer.
|
|
*
|
|
* "fd" is an open file positioned at the start of the "deflate" data
|
|
* "buf" must hold at least "uncompressedLen" bytes.
|
|
*/
|
|
/*static*/ bool ZipUtils::inflateToBuffer(int fd, void* buf,
|
|
long uncompressedLen, long compressedLen)
|
|
{
|
|
bool result = false;
|
|
const unsigned long kReadBufSize = 32768;
|
|
unsigned char* readBuf = NULL;
|
|
z_stream zstream;
|
|
int zerr;
|
|
unsigned long compRemaining;
|
|
|
|
assert(uncompressedLen >= 0);
|
|
assert(compressedLen >= 0);
|
|
|
|
readBuf = new unsigned char[kReadBufSize];
|
|
if (readBuf == NULL)
|
|
goto bail;
|
|
compRemaining = compressedLen;
|
|
|
|
/*
|
|
* 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 = (Bytef*) buf;
|
|
zstream.avail_out = uncompressedLen;
|
|
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) {
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
LOGE("Installed zlib is not compatible with linked version (%s)\n",
|
|
ZLIB_VERSION);
|
|
} else {
|
|
LOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr);
|
|
}
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Loop while we have data.
|
|
*/
|
|
do {
|
|
unsigned long getSize;
|
|
|
|
/* read as much as we can */
|
|
if (zstream.avail_in == 0) {
|
|
getSize = (compRemaining > kReadBufSize) ?
|
|
kReadBufSize : compRemaining;
|
|
LOGV("+++ reading %ld bytes (%ld left)\n",
|
|
getSize, compRemaining);
|
|
|
|
int cc = read(fd, readBuf, getSize);
|
|
if (cc != (int) getSize) {
|
|
LOGD("inflate read failed (%d vs %ld)\n",
|
|
cc, getSize);
|
|
goto z_bail;
|
|
}
|
|
|
|
compRemaining -= getSize;
|
|
|
|
zstream.next_in = readBuf;
|
|
zstream.avail_in = getSize;
|
|
}
|
|
|
|
/* uncompress the data */
|
|
zerr = inflate(&zstream, Z_NO_FLUSH);
|
|
if (zerr != Z_OK && zerr != Z_STREAM_END) {
|
|
LOGD("zlib inflate call failed (zerr=%d)\n", zerr);
|
|
goto z_bail;
|
|
}
|
|
|
|
/* output buffer holds all, so no need to write the output */
|
|
} while (zerr == Z_OK);
|
|
|
|
assert(zerr == Z_STREAM_END); /* other errors should've been caught */
|
|
|
|
if ((long) zstream.total_out != uncompressedLen) {
|
|
LOGW("Size mismatch on inflated file (%ld vs %ld)\n",
|
|
zstream.total_out, uncompressedLen);
|
|
goto z_bail;
|
|
}
|
|
|
|
// success!
|
|
result = true;
|
|
|
|
z_bail:
|
|
inflateEnd(&zstream); /* free up any allocated structures */
|
|
|
|
bail:
|
|
delete[] readBuf;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Utility function that expands zip/gzip "deflate" compressed data
|
|
* into a buffer.
|
|
*
|
|
* (This is a clone of the previous function, but it takes a FILE* instead
|
|
* of an fd. We could pass fileno(fd) to the above, but we can run into
|
|
* trouble when "fp" has a different notion of what fd's file position is.)
|
|
*
|
|
* "fp" is an open file positioned at the start of the "deflate" data
|
|
* "buf" must hold at least "uncompressedLen" bytes.
|
|
*/
|
|
/*static*/ bool ZipUtils::inflateToBuffer(FILE* fp, void* buf,
|
|
long uncompressedLen, long compressedLen)
|
|
{
|
|
bool result = false;
|
|
const unsigned long kReadBufSize = 32768;
|
|
unsigned char* readBuf = NULL;
|
|
z_stream zstream;
|
|
int zerr;
|
|
unsigned long compRemaining;
|
|
|
|
assert(uncompressedLen >= 0);
|
|
assert(compressedLen >= 0);
|
|
|
|
readBuf = new unsigned char[kReadBufSize];
|
|
if (readBuf == NULL)
|
|
goto bail;
|
|
compRemaining = compressedLen;
|
|
|
|
/*
|
|
* 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 = (Bytef*) buf;
|
|
zstream.avail_out = uncompressedLen;
|
|
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) {
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
LOGE("Installed zlib is not compatible with linked version (%s)\n",
|
|
ZLIB_VERSION);
|
|
} else {
|
|
LOGE("Call to inflateInit2 failed (zerr=%d)\n", zerr);
|
|
}
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Loop while we have data.
|
|
*/
|
|
do {
|
|
unsigned long getSize;
|
|
|
|
/* read as much as we can */
|
|
if (zstream.avail_in == 0) {
|
|
getSize = (compRemaining > kReadBufSize) ?
|
|
kReadBufSize : compRemaining;
|
|
LOGV("+++ reading %ld bytes (%ld left)\n",
|
|
getSize, compRemaining);
|
|
|
|
int cc = fread(readBuf, getSize, 1, fp);
|
|
if (cc != (int) getSize) {
|
|
LOGD("inflate read failed (%d vs %ld)\n",
|
|
cc, getSize);
|
|
goto z_bail;
|
|
}
|
|
|
|
compRemaining -= getSize;
|
|
|
|
zstream.next_in = readBuf;
|
|
zstream.avail_in = getSize;
|
|
}
|
|
|
|
/* uncompress the data */
|
|
zerr = inflate(&zstream, Z_NO_FLUSH);
|
|
if (zerr != Z_OK && zerr != Z_STREAM_END) {
|
|
LOGD("zlib inflate call failed (zerr=%d)\n", zerr);
|
|
goto z_bail;
|
|
}
|
|
|
|
/* output buffer holds all, so no need to write the output */
|
|
} while (zerr == Z_OK);
|
|
|
|
assert(zerr == Z_STREAM_END); /* other errors should've been caught */
|
|
|
|
if ((long) zstream.total_out != uncompressedLen) {
|
|
LOGW("Size mismatch on inflated file (%ld vs %ld)\n",
|
|
zstream.total_out, uncompressedLen);
|
|
goto z_bail;
|
|
}
|
|
|
|
// success!
|
|
result = true;
|
|
|
|
z_bail:
|
|
inflateEnd(&zstream); /* free up any allocated structures */
|
|
|
|
bail:
|
|
delete[] readBuf;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Look at the contents of a gzip archive. We want to know where the
|
|
* data starts, and how long it will be after it is uncompressed.
|
|
*
|
|
* We expect to find the CRC and length as the last 8 bytes on the file.
|
|
* This is a pretty reasonable thing to expect for locally-compressed
|
|
* files, but there's a small chance that some extra padding got thrown
|
|
* on (the man page talks about compressed data written to tape). We
|
|
* don't currently deal with that here. If "gzip -l" whines, we're going
|
|
* to fail too.
|
|
*
|
|
* On exit, "fp" is pointing at the start of the compressed data.
|
|
*/
|
|
/*static*/ bool ZipUtils::examineGzip(FILE* fp, int* pCompressionMethod,
|
|
long* pUncompressedLen, long* pCompressedLen, unsigned long* pCRC32)
|
|
{
|
|
enum { // flags
|
|
FTEXT = 0x01,
|
|
FHCRC = 0x02,
|
|
FEXTRA = 0x04,
|
|
FNAME = 0x08,
|
|
FCOMMENT = 0x10,
|
|
};
|
|
int ic;
|
|
int method, flags;
|
|
int i;
|
|
|
|
ic = getc(fp);
|
|
if (ic != 0x1f || getc(fp) != 0x8b)
|
|
return false; // not gzip
|
|
method = getc(fp);
|
|
flags = getc(fp);
|
|
|
|
/* quick sanity checks */
|
|
if (method == EOF || flags == EOF)
|
|
return false;
|
|
if (method != ZipFileRO::kCompressDeflated)
|
|
return false;
|
|
|
|
/* skip over 4 bytes of mod time, 1 byte XFL, 1 byte OS */
|
|
for (i = 0; i < 6; i++)
|
|
(void) getc(fp);
|
|
/* consume "extra" field, if present */
|
|
if ((flags & FEXTRA) != 0) {
|
|
int len;
|
|
|
|
len = getc(fp);
|
|
len |= getc(fp) << 8;
|
|
while (len-- && getc(fp) != EOF)
|
|
;
|
|
}
|
|
/* consume filename, if present */
|
|
if ((flags & FNAME) != 0) {
|
|
do {
|
|
ic = getc(fp);
|
|
} while (ic != 0 && ic != EOF);
|
|
}
|
|
/* consume comment, if present */
|
|
if ((flags & FCOMMENT) != 0) {
|
|
do {
|
|
ic = getc(fp);
|
|
} while (ic != 0 && ic != EOF);
|
|
}
|
|
/* consume 16-bit header CRC, if present */
|
|
if ((flags & FHCRC) != 0) {
|
|
(void) getc(fp);
|
|
(void) getc(fp);
|
|
}
|
|
|
|
if (feof(fp) || ferror(fp))
|
|
return false;
|
|
|
|
/* seek to the end; CRC and length are in the last 8 bytes */
|
|
long curPosn = ftell(fp);
|
|
unsigned char buf[8];
|
|
fseek(fp, -8, SEEK_END);
|
|
*pCompressedLen = ftell(fp) - curPosn;
|
|
|
|
if (fread(buf, 1, 8, fp) != 8)
|
|
return false;
|
|
/* seek back to start of compressed data */
|
|
fseek(fp, curPosn, SEEK_SET);
|
|
|
|
*pCompressionMethod = method;
|
|
*pCRC32 = ZipFileRO::get4LE(&buf[0]);
|
|
*pUncompressedLen = ZipFileRO::get4LE(&buf[4]);
|
|
|
|
return true;
|
|
}
|
|
|