RawImage MosDecoder::decodeRawInternal() {
vector<TiffIFD*> data;
TiffIFD* raw = NULL;
uint32 off = 0;
uint32 base = 8;
// We get a pointer up to the end of the file as we check offset bounds later
const uchar8 *insideTiff = mFile->getData(base, mFile->getSize()-base);
if (get4LE(insideTiff, 0) == 0x49494949) {
uint32 offset = get4LE(insideTiff, 8);
if (offset+base+4 > mFile->getSize())
ThrowRDE("MOS: PhaseOneC offset out of bounds");
uint32 entries = get4LE(insideTiff, offset);
uint32 pos = 8; // Skip another 4 bytes
uint32 width=0, height=0, strip_offset=0, data_offset=0, wb_offset=0;
while (entries--) {
if (offset+base+pos+16 > mFile->getSize())
ThrowRDE("MOS: PhaseOneC offset out of bounds");
uint32 tag = get4LE(insideTiff, offset+pos);
//uint32 type = get4LE(insideTiff, offset+pos+4);
//uint32 len = get4LE(insideTiff, offset+pos+8);
uint32 data = get4LE(insideTiff, offset+pos+12);
pos += 16;
switch(tag) {
case 0x107: wb_offset = data+base; break;
case 0x108: width = data; break;
case 0x109: height = data; break;
case 0x10f: data_offset = data+base; break;
case 0x21c: strip_offset = data+base; break;
case 0x21d: black_level = data>>2; break;
}
}
if (width <= 0 || height <= 0)
ThrowRDE("MOS: PhaseOneC couldn't find width and height");
if (strip_offset+height*4 > mFile->getSize())
ThrowRDE("MOS: PhaseOneC strip offsets out of bounds");
if (data_offset > mFile->getSize())
ThrowRDE("MOS: PhaseOneC data offset out of bounds");
mRaw->dim = iPoint2D(width, height);
mRaw->createData();
DecodePhaseOneC(data_offset, strip_offset, width, height);
const uchar8 *data = mFile->getData(wb_offset, 12);
for(int i=0; i<3; i++) {
// Use get4LE instead of going straight to float so this is endian clean
uint32 value = get4LE(data, i*4);
mRaw->metadata.wbCoeffs[i] = *((float *) &value);
}
return mRaw;
} else {
/**
* Convert a binary log entry to ASCII form.
*
* For convenience we mimic the processLogBuffer API. There is no
* pre-defined output length for the binary data, since we're free to format
* it however we choose, which means we can't really use a fixed-size buffer
* here.
*/
int android_log_processBinaryLogBuffer(struct logger_entry *buf,
AndroidLogEntry *entry, const EventTagMap* map, char* messageBuf,
int messageBufLen)
{
size_t inCount;
unsigned int tagIndex;
const unsigned char* eventData;
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->priority = ANDROID_LOG_INFO;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* Pull the tag out.
*/
eventData = (const unsigned char*) buf->msg;
inCount = buf->len;
if (inCount < 4)
return -1;
tagIndex = get4LE(eventData);
eventData += 4;
inCount -= 4;
if (map != NULL) {
entry->tag = android_lookupEventTag(map, tagIndex);
} else {
entry->tag = NULL;
}
/*
* If we don't have a map, or didn't find the tag number in the map,
* stuff a generated tag value into the start of the output buffer and
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
int tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
entry->tag = messageBuf;
messageBuf += tagLen+1;
messageBufLen -= tagLen+1;
}
/*
* Format the event log data into the buffer.
*/
char* outBuf = messageBuf;
size_t outRemaining = messageBufLen-1; /* leave one for nul byte */
int result;
result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
&outRemaining);
if (result < 0) {
fprintf(stderr, "Binary log entry conversion failed\n");
return -1;
} else if (result == 1) {
if (outBuf > messageBuf) {
/* leave an indicator */
*(outBuf-1) = '!';
} else {
/* no room to output anything at all */
*outBuf++ = '!';
outRemaining--;
}
/* pretend we ate all the data */
inCount = 0;
}
/* eat the silly terminating '\n' */
if (inCount == 1 && *eventData == '\n') {
eventData++;
inCount--;
}
if (inCount != 0) {
fprintf(stderr,
"Warning: leftover binary log data (%zu bytes)\n", inCount);
}
/*
* Terminate the buffer. The NUL byte does not count as part of
* entry->messageLen.
*/
*outBuf = '\0';
entry->messageLen = outBuf - messageBuf;
assert(entry->messageLen == (messageBufLen-1) - outRemaining);
entry->message = messageBuf;
return 0;
}
/*
* Recursively convert binary log data to printable form.
*
* This needs to be recursive because you can have lists of lists.
*
* If we run out of room, we stop processing immediately. It's important
* for us to check for space on every output element to avoid producing
* garbled output.
*
* Returns 0 on success, 1 on buffer full, -1 on failure.
*/
static int android_log_printBinaryEvent(const unsigned char** pEventData,
size_t* pEventDataLen, char** pOutBuf, size_t* pOutBufLen)
{
const unsigned char* eventData = *pEventData;
size_t eventDataLen = *pEventDataLen;
char* outBuf = *pOutBuf;
size_t outBufLen = *pOutBufLen;
unsigned char type;
size_t outCount;
int result = 0;
if (eventDataLen < 1)
return -1;
type = *eventData++;
eventDataLen--;
//fprintf(stderr, "--- type=%d (rem len=%d)\n", type, eventDataLen);
switch (type) {
case EVENT_TYPE_INT:
/* 32-bit signed int */
{
int ival;
if (eventDataLen < 4)
return -1;
ival = get4LE(eventData);
eventData += 4;
eventDataLen -= 4;
outCount = snprintf(outBuf, outBufLen, "%d", ival);
if (outCount < outBufLen) {
outBuf += outCount;
outBufLen -= outCount;
} else {
/* halt output */
goto no_room;
}
}
break;
case EVENT_TYPE_LONG:
/* 64-bit signed long */
{
long long lval;
if (eventDataLen < 8)
return -1;
lval = get8LE(eventData);
eventData += 8;
eventDataLen -= 8;
outCount = snprintf(outBuf, outBufLen, "%lld", lval);
if (outCount < outBufLen) {
outBuf += outCount;
outBufLen -= outCount;
} else {
/* halt output */
goto no_room;
}
}
break;
case EVENT_TYPE_STRING:
/* UTF-8 chars, not NULL-terminated */
{
unsigned int strLen;
if (eventDataLen < 4)
return -1;
strLen = get4LE(eventData);
eventData += 4;
eventDataLen -= 4;
if (eventDataLen < strLen)
return -1;
if (strLen < outBufLen) {
memcpy(outBuf, eventData, strLen);
outBuf += strLen;
outBufLen -= strLen;
} else if (outBufLen > 0) {
/* copy what we can */
memcpy(outBuf, eventData, outBufLen);
outBuf += outBufLen;
outBufLen -= outBufLen;
goto no_room;
}
eventData += strLen;
eventDataLen -= strLen;
break;
}
case EVENT_TYPE_LIST:
/* N items, all different types */
{
unsigned char count;
int i;
if (eventDataLen < 1)
return -1;
count = *eventData++;
eventDataLen--;
if (outBufLen > 0) {
*outBuf++ = '[';
outBufLen--;
} else {
goto no_room;
}
for (i = 0; i < count; i++) {
result = android_log_printBinaryEvent(&eventData, &eventDataLen,
&outBuf, &outBufLen);
if (result != 0)
goto bail;
if (i < count-1) {
if (outBufLen > 0) {
*outBuf++ = ',';
outBufLen--;
} else {
goto no_room;
}
}
}
if (outBufLen > 0) {
*outBuf++ = ']';
outBufLen--;
} else {
goto no_room;
}
}
break;
default:
fprintf(stderr, "Unknown binary event type %d\n", type);
return -1;
}
bail:
*pEventData = eventData;
*pEventDataLen = eventDataLen;
*pOutBuf = outBuf;
*pOutBufLen = outBufLen;
return result;
no_room:
result = 1;
goto bail;
}
status_t LogSection::BlockingCall(int pipeWriteFd) const {
// Open log buffer and getting logs since last retrieved time if any.
unique_ptr<logger_list, void (*)(logger_list*)> loggers(
gLastLogsRetrieved.find(mLogID) == gLastLogsRetrieved.end()
? android_logger_list_alloc(ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 0, 0)
: android_logger_list_alloc_time(ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK,
gLastLogsRetrieved[mLogID], 0),
android_logger_list_free);
if (android_logger_open(loggers.get(), mLogID) == NULL) {
ALOGE("LogSection %s: Can't get logger.", this->name.string());
return -1;
}
log_msg msg;
log_time lastTimestamp(0);
ProtoOutputStream proto;
while (true) { // keeps reading until logd buffer is fully read.
status_t err = android_logger_list_read(loggers.get(), &msg);
// err = 0 - no content, unexpected connection drop or EOF.
// err = +ive number - size of retrieved data from logger
// err = -ive number, OS supplied error _except_ for -EAGAIN
// err = -EAGAIN, graceful indication for ANDRODI_LOG_NONBLOCK that this is the end of data.
if (err <= 0) {
if (err != -EAGAIN) {
ALOGW("LogSection %s: fails to read a log_msg.\n", this->name.string());
}
// dump previous logs and don't consider this error a failure.
break;
}
if (mBinary) {
// remove the first uint32 which is tag's index in event log tags
android_log_context context = create_android_log_parser(msg.msg() + sizeof(uint32_t),
msg.len() - sizeof(uint32_t));
;
android_log_list_element elem;
lastTimestamp.tv_sec = msg.entry_v1.sec;
lastTimestamp.tv_nsec = msg.entry_v1.nsec;
// format a BinaryLogEntry
uint64_t token = proto.start(LogProto::BINARY_LOGS);
proto.write(BinaryLogEntry::SEC, msg.entry_v1.sec);
proto.write(BinaryLogEntry::NANOSEC, msg.entry_v1.nsec);
proto.write(BinaryLogEntry::UID, (int)msg.entry_v4.uid);
proto.write(BinaryLogEntry::PID, msg.entry_v1.pid);
proto.write(BinaryLogEntry::TID, msg.entry_v1.tid);
proto.write(BinaryLogEntry::TAG_INDEX,
get4LE(reinterpret_cast<uint8_t const*>(msg.msg())));
do {
elem = android_log_read_next(context);
uint64_t elemToken = proto.start(BinaryLogEntry::ELEMS);
switch (elem.type) {
case EVENT_TYPE_INT:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_INT);
proto.write(BinaryLogEntry::Elem::VAL_INT32, (int)elem.data.int32);
break;
case EVENT_TYPE_LONG:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_LONG);
proto.write(BinaryLogEntry::Elem::VAL_INT64, (long long)elem.data.int64);
break;
case EVENT_TYPE_STRING:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_STRING);
proto.write(BinaryLogEntry::Elem::VAL_STRING, elem.data.string, elem.len);
break;
case EVENT_TYPE_FLOAT:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_FLOAT);
proto.write(BinaryLogEntry::Elem::VAL_FLOAT, elem.data.float32);
break;
case EVENT_TYPE_LIST:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_LIST);
break;
case EVENT_TYPE_LIST_STOP:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_LIST_STOP);
break;
case EVENT_TYPE_UNKNOWN:
proto.write(BinaryLogEntry::Elem::TYPE,
BinaryLogEntry::Elem::EVENT_TYPE_UNKNOWN);
break;
}
proto.end(elemToken);
} while ((elem.type != EVENT_TYPE_UNKNOWN) && !elem.complete);
proto.end(token);
if (context) {
android_log_destroy(&context);
}
} else {
AndroidLogEntry entry;
err = android_log_processLogBuffer(&msg.entry_v1, &entry);
if (err != NO_ERROR) {
ALOGW("LogSection %s: fails to process to an entry.\n", this->name.string());
break;
}
lastTimestamp.tv_sec = entry.tv_sec;
lastTimestamp.tv_nsec = entry.tv_nsec;
// format a TextLogEntry
uint64_t token = proto.start(LogProto::TEXT_LOGS);
proto.write(TextLogEntry::SEC, (long long)entry.tv_sec);
proto.write(TextLogEntry::NANOSEC, (long long)entry.tv_nsec);
proto.write(TextLogEntry::PRIORITY, (int)entry.priority);
proto.write(TextLogEntry::UID, entry.uid);
proto.write(TextLogEntry::PID, entry.pid);
proto.write(TextLogEntry::TID, entry.tid);
proto.write(TextLogEntry::TAG, entry.tag, trimTail(entry.tag, entry.tagLen));
proto.write(TextLogEntry::LOG, entry.message,
trimTail(entry.message, entry.messageLen));
proto.end(token);
}
}
gLastLogsRetrieved[mLogID] = lastTimestamp;
if (!proto.flush(pipeWriteFd) && errno == EPIPE) {
ALOGE("[%s] wrote to a broken pipe\n", this->name.string());
return EPIPE;
}
return NO_ERROR;
}
/**
* Convert a binary log entry to ASCII form.
*
* For convenience we mimic the processLogBuffer API. There is no
* pre-defined output length for the binary data, since we're free to format
* it however we choose, which means we can't really use a fixed-size buffer
* here.
*/
LIBLOG_ABI_PUBLIC int android_log_processBinaryLogBuffer(
struct logger_entry *buf,
AndroidLogEntry *entry,
const EventTagMap *map,
char *messageBuf, int messageBufLen)
{
size_t inCount;
unsigned int tagIndex;
const unsigned char* eventData;
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->priority = ANDROID_LOG_INFO;
entry->uid = -1;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* Pull the tag out, fill in some additional details based on incoming
* buffer version (v3 adds lid, v4 adds uid).
*/
eventData = (const unsigned char*) buf->msg;
struct logger_entry_v2 *buf2 = (struct logger_entry_v2 *)buf;
if (buf2->hdr_size) {
if ((buf2->hdr_size < sizeof(((struct log_msg *)NULL)->entry_v1)) ||
(buf2->hdr_size > sizeof(((struct log_msg *)NULL)->entry))) {
fprintf(stderr, "+++ LOG: entry illegal hdr_size\n");
return -1;
}
eventData = ((unsigned char *)buf2) + buf2->hdr_size;
if ((buf2->hdr_size >= sizeof(struct logger_entry_v3)) &&
(((struct logger_entry_v3 *)buf)->lid == LOG_ID_SECURITY)) {
entry->priority = ANDROID_LOG_WARN;
}
if (buf2->hdr_size >= sizeof(struct logger_entry_v4)) {
entry->uid = ((struct logger_entry_v4 *)buf)->uid;
}
}
inCount = buf->len;
if (inCount < 4)
return -1;
tagIndex = get4LE(eventData);
eventData += 4;
inCount -= 4;
entry->tagLen = 0;
if (map != NULL) {
entry->tag = android_lookupEventTag_len(map, &entry->tagLen, tagIndex);
} else {
entry->tag = NULL;
}
/*
* If we don't have a map, or didn't find the tag number in the map,
* stuff a generated tag value into the start of the output buffer and
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
size_t tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
if (tagLen >= (size_t)messageBufLen) {
tagLen = messageBufLen - 1;
}
entry->tag = messageBuf;
entry->tagLen = tagLen;
messageBuf += tagLen + 1;
messageBufLen -= tagLen + 1;
}
/*
* Format the event log data into the buffer.
*/
char* outBuf = messageBuf;
size_t outRemaining = messageBufLen-1; /* leave one for nul byte */
int result;
result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
&outRemaining);
if (result < 0) {
fprintf(stderr, "Binary log entry conversion failed\n");
return -1;
} else if (result == 1) {
if (outBuf > messageBuf) {
/* leave an indicator */
*(outBuf-1) = '!';
} else {
/* no room to output anything at all */
*outBuf++ = '!';
outRemaining--;
}
/* pretend we ate all the data */
inCount = 0;
}
/* eat the silly terminating '\n' */
if (inCount == 1 && *eventData == '\n') {
eventData++;
inCount--;
}
if (inCount != 0) {
fprintf(stderr,
"Warning: leftover binary log data (%zu bytes)\n", inCount);
}
/*
* Terminate the buffer. The NUL byte does not count as part of
* entry->messageLen.
*/
*outBuf = '\0';
entry->messageLen = outBuf - messageBuf;
assert(entry->messageLen == (messageBufLen-1) - outRemaining);
entry->message = messageBuf;
return 0;
}
bool ObbFile::parseObbFile(int fd)
{
off64_t fileLength = lseek64(fd, 0, SEEK_END);
if (fileLength < kFooterMinSize) {
if (fileLength < 0) {
ALOGW("error seeking in ObbFile: %s\n", strerror(errno));
} else {
ALOGW("file is only %lld (less than %d minimum)\n", fileLength, kFooterMinSize);
}
return false;
}
ssize_t actual;
size_t footerSize;
{
lseek64(fd, fileLength - kFooterTagSize, SEEK_SET);
char *footer = new char[kFooterTagSize];
actual = TEMP_FAILURE_RETRY(read(fd, footer, kFooterTagSize));
if (actual != kFooterTagSize) {
ALOGW("couldn't read footer signature: %s\n", strerror(errno));
return false;
}
unsigned int fileSig = get4LE((unsigned char*)footer + sizeof(int32_t));
if (fileSig != kSignature) {
ALOGW("footer didn't match magic string (expected 0x%08x; got 0x%08x)\n",
kSignature, fileSig);
return false;
}
footerSize = get4LE((unsigned char*)footer);
if (footerSize > (size_t)fileLength - kFooterTagSize
|| footerSize > kMaxBufSize) {
ALOGW("claimed footer size is too large (0x%08zx; file size is 0x%08llx)\n",
footerSize, fileLength);
return false;
}
if (footerSize < (kFooterMinSize - kFooterTagSize)) {
ALOGW("claimed footer size is too small (0x%zx; minimum size is 0x%x)\n",
footerSize, kFooterMinSize - kFooterTagSize);
return false;
}
}
off64_t fileOffset = fileLength - footerSize - kFooterTagSize;
if (lseek64(fd, fileOffset, SEEK_SET) != fileOffset) {
ALOGW("seek %lld failed: %s\n", fileOffset, strerror(errno));
return false;
}
mFooterStart = fileOffset;
char* scanBuf = (char*)malloc(footerSize);
if (scanBuf == NULL) {
ALOGW("couldn't allocate scanBuf: %s\n", strerror(errno));
return false;
}
actual = TEMP_FAILURE_RETRY(read(fd, scanBuf, footerSize));
// readAmount is guaranteed to be less than kMaxBufSize
if (actual != (ssize_t)footerSize) {
ALOGI("couldn't read ObbFile footer: %s\n", strerror(errno));
free(scanBuf);
return false;
}
#ifdef DEBUG
for (int i = 0; i < footerSize; ++i) {
ALOGI("char: 0x%02x\n", scanBuf[i]);
}
#endif
uint32_t sigVersion = get4LE((unsigned char*)scanBuf);
if (sigVersion != kSigVersion) {
ALOGW("Unsupported ObbFile version %d\n", sigVersion);
free(scanBuf);
return false;
}
mVersion = (int32_t) get4LE((unsigned char*)scanBuf + kPackageVersionOffset);
mFlags = (int32_t) get4LE((unsigned char*)scanBuf + kFlagsOffset);
memcpy(&mSalt, (unsigned char*)scanBuf + kSaltOffset, sizeof(mSalt));
size_t packageNameLen = get4LE((unsigned char*)scanBuf + kPackageNameLenOffset);
if (packageNameLen == 0
|| packageNameLen > (footerSize - kPackageNameOffset)) {
ALOGW("bad ObbFile package name length (0x%04zx; 0x%04zx possible)\n",
packageNameLen, footerSize - kPackageNameOffset);
free(scanBuf);
return false;
}
char* packageName = reinterpret_cast<char*>(scanBuf + kPackageNameOffset);
mPackageName = String8(const_cast<char*>(packageName), packageNameLen);
free(scanBuf);
#ifdef DEBUG
ALOGI("Obb scan succeeded: packageName=%s, version=%d\n", mPackageName.string(), mVersion);
#endif
return true;
}
/*
* Get the useful fields from the zip entry.
*
* Returns non-zero if the contents of the fields (particularly the data
* offset) appear to be bogus.
*/
int dexZipGetEntryInfo(const ZipArchive* pArchive, ZipEntry entry,
int* pMethod, size_t* pUncompLen, size_t* pCompLen, off_t* pOffset,
long* pModWhen, long* pCrc32)
{
int ent = entryToIndex(pArchive, entry);
if (ent < 0)
return -1;
/*
* Recover the start of the central directory entry from the filename
* pointer. The filename is the first entry past the fixed-size data,
* so we can just subtract back from that.
*/
const unsigned char* basePtr = (const unsigned char*)
pArchive->mDirectoryMap.addr;
const unsigned char* ptr = (const unsigned char*)
pArchive->mHashTable[ent].name;
off_t cdOffset = pArchive->mDirectoryOffset;
ptr -= kCDELen;
int method = get2LE(ptr + kCDEMethod);
if (pMethod != NULL)
*pMethod = method;
if (pModWhen != NULL)
*pModWhen = get4LE(ptr + kCDEModWhen);
if (pCrc32 != NULL)
*pCrc32 = get4LE(ptr + kCDECRC);
size_t compLen = get4LE(ptr + kCDECompLen);
if (pCompLen != NULL)
*pCompLen = compLen;
size_t uncompLen = get4LE(ptr + kCDEUncompLen);
if (pUncompLen != NULL)
*pUncompLen = uncompLen;
/*
* If requested, determine the offset of the start of the data. All we
* have is the offset to the Local File Header, which is variable size,
* so we have to read the contents of the struct to figure out where
* the actual data starts.
*
* We also need to make sure that the lengths are not so large that
* somebody trying to map the compressed or uncompressed data runs
* off the end of the mapped region.
*
* Note we don't verify compLen/uncompLen if they don't request the
* dataOffset, because dataOffset is expensive to determine. However,
* if they don't have the file offset, they're not likely to be doing
* anything with the contents.
*/
if (pOffset != NULL) {
long localHdrOffset = (long) get4LE(ptr + kCDELocalOffset);
if (localHdrOffset + kLFHLen >= cdOffset) {
LOGW("Zip: bad local hdr offset in zip\n");
return -1;
}
u1 lfhBuf[kLFHLen];
if (lseek(pArchive->mFd, localHdrOffset, SEEK_SET) != localHdrOffset) {
LOGW("Zip: failed seeking to lfh at offset %ld\n", localHdrOffset);
return -1;
}
ssize_t actual =
TEMP_FAILURE_RETRY(read(pArchive->mFd, lfhBuf, sizeof(lfhBuf)));
if (actual != sizeof(lfhBuf)) {
LOGW("Zip: failed reading lfh from offset %ld\n", localHdrOffset);
return -1;
}
if (get4LE(lfhBuf) != kLFHSignature) {
LOGW("Zip: didn't find signature at start of lfh, offset=%ld\n",
localHdrOffset);
return -1;
}
off_t dataOffset = localHdrOffset + kLFHLen
+ get2LE(lfhBuf + kLFHNameLen) + get2LE(lfhBuf + kLFHExtraLen);
if (dataOffset >= cdOffset) {
LOGW("Zip: bad data offset %ld in zip\n", (long) dataOffset);
return -1;
}
/* check lengths */
if ((off_t)(dataOffset + compLen) > cdOffset) {
LOGW("Zip: bad compressed length in zip (%ld + %zd > %ld)\n",
(long) dataOffset, compLen, (long) cdOffset);
return -1;
}
if (method == kCompressStored &&
(off_t)(dataOffset + uncompLen) > cdOffset)
{
LOGW("Zip: bad uncompressed length in zip (%ld + %zd > %ld)\n",
(long) dataOffset, uncompLen, (long) cdOffset);
return -1;
}
*pOffset = dataOffset;
}
return 0;
}
/*
* Find the zip Central Directory and memory-map it.
*
* On success, returns 0 after populating fields from the EOCD area:
* mDirectoryOffset
* mDirectoryMap
* mNumEntries
*/
static int mapCentralDirectory(int fd, const char* debugFileName,
ZipArchive* pArchive)
{
u1* scanBuf = NULL;
int result = -1;
/*
* Get and test file length.
*/
off_t fileLength = lseek(fd, 0, SEEK_END);
if (fileLength < kEOCDLen) {
LOGV("Zip: length %ld is too small to be zip\n", (long) fileLength);
goto bail;
}
/*
* Perform the traditional EOCD snipe hunt.
*
* We're searching for the End of Central Directory magic number,
* which appears at the start of the EOCD block. It's followed by
* 18 bytes of EOCD stuff and up to 64KB of archive comment. We
* need to read the last part of the file into a buffer, dig through
* it to find the magic number, parse some values out, and use those
* to determine the extent of the CD.
*
* We start by pulling in the last part of the file.
*/
size_t readAmount = kMaxEOCDSearch;
if (readAmount > (size_t) fileLength)
readAmount = fileLength;
off_t searchStart = fileLength - readAmount;
scanBuf = (u1*) malloc(readAmount);
if (lseek(fd, searchStart, SEEK_SET) != searchStart) {
LOGW("Zip: seek %ld failed: %s\n", (long) searchStart, strerror(errno));
goto bail;
}
ssize_t actual = TEMP_FAILURE_RETRY(read(fd, scanBuf, readAmount));
if (actual != (ssize_t) readAmount) {
LOGW("Zip: read %zd failed: %s\n", readAmount, strerror(errno));
goto bail;
}
/*
* Scan backward for the EOCD magic. In an archive without a trailing
* comment, we'll find it on the first try. (We may want to consider
* doing an initial minimal read; if we don't find it, retry with a
* second read as above.)
*/
int i;
for (i = readAmount - kEOCDLen; i >= 0; i--) {
if (scanBuf[i] == 0x50 && get4LE(&scanBuf[i]) == kEOCDSignature) {
LOGV("+++ Found EOCD at buf+%d\n", i);
break;
}
}
if (i < 0) {
LOGD("Zip: EOCD not found, %s is not zip\n", debugFileName);
goto bail;
}
off_t eocdOffset = searchStart + i;
const u1* eocdPtr = scanBuf + i;
assert(eocdOffset < fileLength);
/*
* Grab the CD offset and size, and the number of entries in the
* archive. Verify that they look reasonable.
*/
u4 numEntries = get2LE(eocdPtr + kEOCDNumEntries);
u4 dirSize = get4LE(eocdPtr + kEOCDSize);
u4 dirOffset = get4LE(eocdPtr + kEOCDFileOffset);
if ((long long) dirOffset + (long long) dirSize > (long long) eocdOffset) {
LOGW("Zip: bad offsets (dir %ld, size %u, eocd %ld)\n",
(long) dirOffset, dirSize, (long) eocdOffset);
goto bail;
}
if (numEntries == 0) {
LOGW("Zip: empty archive?\n");
goto bail;
}
LOGV("+++ numEntries=%d dirSize=%d dirOffset=%d\n",
numEntries, dirSize, dirOffset);
/*
* It all looks good. Create a mapping for the CD, and set the fields
* in pArchive.
*/
if (sysMapFileSegmentInShmem(fd, dirOffset, dirSize,
&pArchive->mDirectoryMap) != 0)
{
LOGW("Zip: cd map failed\n");
goto bail;
}
pArchive->mNumEntries = numEntries;
pArchive->mDirectoryOffset = dirOffset;
result = 0;
bail:
free(scanBuf);
return result;
}
/*
* Parses the Zip archive's Central Directory. Allocates and populates the
* hash table.
*
* Returns 0 on success.
*/
static int parseZipArchive(ZipArchive* pArchive)
{
int result = -1;
const u1* cdPtr = (const u1*)pArchive->mDirectoryMap.addr;
size_t cdLength = pArchive->mDirectoryMap.length;
int numEntries = pArchive->mNumEntries;
/*
* Create hash table. We have a minimum 75% load factor, possibly as
* low as 50% after we round off to a power of 2. There must be at
* least one unused entry to avoid an infinite loop during creation.
*/
pArchive->mHashTableSize = dexRoundUpPower2(1 + (numEntries * 4) / 3);
pArchive->mHashTable = (ZipHashEntry*)
calloc(pArchive->mHashTableSize, sizeof(ZipHashEntry));
/*
* Walk through the central directory, adding entries to the hash
* table and verifying values.
*/
const u1* ptr = cdPtr;
int i;
for (i = 0; i < numEntries; i++) {
if (get4LE(ptr) != kCDESignature) {
LOGW("Zip: missed a central dir sig (at %d)\n", i);
goto bail;
}
if (ptr + kCDELen > cdPtr + cdLength) {
LOGW("Zip: ran off the end (at %d)\n", i);
goto bail;
}
long localHdrOffset = (long) get4LE(ptr + kCDELocalOffset);
if (localHdrOffset >= pArchive->mDirectoryOffset) {
LOGW("Zip: bad LFH offset %ld at entry %d\n", localHdrOffset, i);
goto bail;
}
unsigned int fileNameLen, extraLen, commentLen, hash;
fileNameLen = get2LE(ptr + kCDENameLen);
extraLen = get2LE(ptr + kCDEExtraLen);
commentLen = get2LE(ptr + kCDECommentLen);
/* add the CDE filename to the hash table */
hash = computeHash((const char*)ptr + kCDELen, fileNameLen);
addToHash(pArchive, (const char*)ptr + kCDELen, fileNameLen, hash);
ptr += kCDELen + fileNameLen + extraLen + commentLen;
if ((size_t)(ptr - cdPtr) > cdLength) {
LOGW("Zip: bad CD advance (%d vs %zd) at entry %d\n",
(int) (ptr - cdPtr), cdLength, i);
goto bail;
}
}
LOGV("+++ zip good scan %d entries\n", numEntries);
result = 0;
bail:
return result;
}
/*
* Get the useful fields from the zip entry.
*
* Returns "false" if the offsets to the fields or the contents of the fields
* appear to be bogus.
*/
bool dexZipGetEntryInfo(const ZipArchive* pArchive, ZipEntry entry,
int* pMethod, long* pUncompLen, long* pCompLen, off_t* pOffset,
long* pModWhen, long* pCrc32)
{
int ent = entryToIndex(pArchive, entry);
if (ent < 0)
return false;
/*
* Recover the start of the central directory entry from the filename
* pointer.
*/
const unsigned char* basePtr = (const unsigned char*)
pArchive->mMap.addr;
const unsigned char* ptr = (const unsigned char*)
pArchive->mHashTable[ent].name;
size_t zipLength =
pArchive->mMap.length;
ptr -= kCDELen;
int method = get2LE(ptr + kCDEMethod);
if (pMethod != NULL)
*pMethod = method;
if (pModWhen != NULL)
*pModWhen = get4LE(ptr + kCDEModWhen);
if (pCrc32 != NULL)
*pCrc32 = get4LE(ptr + kCDECRC);
/*
* We need to make sure that the lengths are not so large that somebody
* trying to map the compressed or uncompressed data runs off the end
* of the mapped region.
*/
unsigned long localHdrOffset = get4LE(ptr + kCDELocalOffset);
if (localHdrOffset + kLFHLen >= zipLength) {
LOGE("ERROR: bad local hdr offset in zip\n");
return false;
}
const unsigned char* localHdr = basePtr + localHdrOffset;
off_t dataOffset = localHdrOffset + kLFHLen
+ get2LE(localHdr + kLFHNameLen) + get2LE(localHdr + kLFHExtraLen);
if ((unsigned long) dataOffset >= zipLength) {
LOGE("ERROR: bad data offset in zip\n");
return false;
}
if (pCompLen != NULL) {
*pCompLen = get4LE(ptr + kCDECompLen);
if (*pCompLen < 0 || (size_t)(dataOffset + *pCompLen) >= zipLength) {
LOGE("ERROR: bad compressed length in zip\n");
return false;
}
}
if (pUncompLen != NULL) {
*pUncompLen = get4LE(ptr + kCDEUncompLen);
if (*pUncompLen < 0) {
LOGE("ERROR: negative uncompressed length in zip\n");
return false;
}
if (method == kCompressStored &&
(size_t)(dataOffset + *pUncompLen) >= zipLength)
{
LOGE("ERROR: bad uncompressed length in zip\n");
return false;
}
}
if (pOffset != NULL) {
*pOffset = dataOffset;
}
return true;
}
void __android_log_btwrite_multiple__helper(int count) {
log_time ts(CLOCK_MONOTONIC);
struct logger_list *logger_list;
ASSERT_TRUE(NULL != (logger_list = android_logger_list_open(
LOG_ID_EVENTS, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 1000, 0)));
log_time ts1(CLOCK_MONOTONIC);
pid_t pid = fork();
if (pid == 0) {
// child
for (int i = count; i; --i) {
ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
usleep(100);
}
ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts1, sizeof(ts1)));
usleep(1000000);
_exit(0);
}
siginfo_t info{};
ASSERT_EQ(0, TEMP_FAILURE_RETRY(waitid(P_PID, pid, &info, WEXITED)));
int expected_count = (count < 2) ? count : 2;
int expected_chatty_count = (count <= 2) ? 0 : 1;
int expected_expire_count = (count < 2) ? 0 : (count - 2);
count = 0;
int second_count = 0;
int chatty_count = 0;
int expire_count = 0;
for (;;) {
log_msg log_msg;
if (android_logger_list_read(logger_list, &log_msg) <= 0) break;
if ((log_msg.entry.pid != pid) ||
(log_msg.entry.len < (4 + 1 + 8)) ||
(log_msg.id() != LOG_ID_EVENTS)) continue;
char *eventData = log_msg.msg();
if (!eventData) continue;
uint32_t tag = get4LE(eventData);
if ((eventData[4] == EVENT_TYPE_LONG) && (log_msg.entry.len == (4 + 1 + 8))) {
if (tag != 0) continue;
log_time tx(eventData + 4 + 1);
if (ts == tx) {
++count;
} else if (ts1 == tx) {
++second_count;
}
} else if (eventData[4] == EVENT_TYPE_STRING) {
// chatty
if (tag != 1004) continue;
++chatty_count;
// int len = get4LE(eventData + 4 + 1);
const char *cp = strstr(eventData + 4 + 1 + 4, " expire ");
if (!cp) continue;
unsigned val = 0;
sscanf(cp, " expire %u lines", &val);
expire_count += val;
}
}
EXPECT_EQ(expected_count, count);
EXPECT_EQ(1, second_count);
EXPECT_EQ(expected_chatty_count, chatty_count);
EXPECT_EQ(expected_expire_count, expire_count);
android_logger_list_close(logger_list);
}
/*
* Parse the Zip archive, verifying its contents and initializing internal
* data structures.
*/
static bool parseZipArchive(ZipArchive* pArchive, const MemMapping* pMap)
{
#define CHECK_OFFSET(_off) { \
if ((unsigned int) (_off) >= maxOffset) { \
LOGE("ERROR: bad offset %u (max %d): %s\n", \
(unsigned int) (_off), maxOffset, #_off); \
goto bail; \
} \
}
bool result = false;
const unsigned char* basePtr = (const unsigned char*)pMap->addr;
const unsigned char* ptr;
size_t length = pMap->length;
unsigned int i, numEntries, cdOffset;
unsigned int val;
/*
* The first 4 bytes of the file will either be the local header
* signature for the first file (kLFHSignature) or, if the archive doesn't
* have any files in it, the end-of-central-directory signature
* (kEOCDSignature).
*/
val = get4LE(basePtr);
if (val == kEOCDSignature) {
LOGI("Found Zip archive, but it looks empty\n");
goto bail;
} else if (val != kLFHSignature) {
LOGV("Not a Zip archive (found 0x%08x)\n", val);
goto bail;
}
/*
* Find the EOCD. We'll find it immediately unless they have a file
* comment.
*/
ptr = basePtr + length - kEOCDLen;
while (ptr >= basePtr) {
if (*ptr == (kEOCDSignature & 0xff) && get4LE(ptr) == kEOCDSignature)
break;
ptr--;
}
if (ptr < basePtr) {
LOGI("Could not find end-of-central-directory in Zip\n");
goto bail;
}
/*
* There are two interesting items in the EOCD block: the number of
* entries in the file, and the file offset of the start of the
* central directory.
*
* (There's actually a count of the #of entries in this file, and for
* all files which comprise a spanned archive, but for our purposes
* we're only interested in the current file. Besides, we expect the
* two to be equivalent for our stuff.)
*/
numEntries = get2LE(ptr + kEOCDNumEntries);
cdOffset = get4LE(ptr + kEOCDFileOffset);
/* valid offsets are [0,EOCD] */
unsigned int maxOffset;
maxOffset = (ptr - basePtr) +1;
LOGV("+++ numEntries=%d cdOffset=%d\n", numEntries, cdOffset);
if (numEntries == 0 || cdOffset >= length) {
LOGW("Invalid entries=%d offset=%d (len=%zd)\n",
numEntries, cdOffset, length);
goto bail;
}
/*
* Create hash table. We have a minimum 75% load factor, possibly as
* low as 50% after we round off to a power of 2. There must be at
* least one unused entry to avoid an infinite loop during creation.
*/
pArchive->mNumEntries = numEntries;
pArchive->mHashTableSize = dexRoundUpPower2(1 + (numEntries * 4) / 3);
pArchive->mHashTable = (ZipHashEntry*)
calloc(pArchive->mHashTableSize, sizeof(ZipHashEntry));
/*
* Walk through the central directory, adding entries to the hash
* table.
*/
ptr = basePtr + cdOffset;
for (i = 0; i < numEntries; i++) {
unsigned int fileNameLen, extraLen, commentLen, localHdrOffset;
const unsigned char* localHdr;
unsigned int hash;
if (get4LE(ptr) != kCDESignature) {
LOGW("Missed a central dir sig (at %d)\n", i);
goto bail;
}
if (ptr + kCDELen > basePtr + length) {
LOGW("Ran off the end (at %d)\n", i);
goto bail;
}
localHdrOffset = get4LE(ptr + kCDELocalOffset);
CHECK_OFFSET(localHdrOffset);
fileNameLen = get2LE(ptr + kCDENameLen);
extraLen = get2LE(ptr + kCDEExtraLen);
commentLen = get2LE(ptr + kCDECommentLen);
//LOGV("+++ %d: localHdr=%d fnl=%d el=%d cl=%d\n",
// i, localHdrOffset, fileNameLen, extraLen, commentLen);
//LOGV(" '%.*s'\n", fileNameLen, ptr + kCDELen);
/* add the CDE filename to the hash table */
hash = computeHash((const char*)ptr + kCDELen, fileNameLen);
addToHash(pArchive, (const char*)ptr + kCDELen, fileNameLen, hash);
localHdr = basePtr + localHdrOffset;
if (get4LE(localHdr) != kLFHSignature) {
LOGW("Bad offset to local header: %d (at %d)\n",
localHdrOffset, i);
goto bail;
}
ptr += kCDELen + fileNameLen + extraLen + commentLen;
CHECK_OFFSET(ptr - basePtr);
}
result = true;
bail:
return result;
#undef CHECK_OFFSET
}
static int mapCentralDirectory0(int fd, const char* debugFileName,
ZipArchive* pArchive, off_t fileLength, size_t readAmount, u1* scanBuf)
{
off_t searchStart = fileLength - readAmount;
if (lseek(fd, searchStart, SEEK_SET) != searchStart) {
LOGW("Zip: seek %ld failed: %s", (long) searchStart, strerror(errno));
return -1;
}
ssize_t actual = TEMP_FAILURE_RETRY(read(fd, scanBuf, readAmount));
if (actual != (ssize_t) readAmount) {
LOGW("Zip: read %zd failed: %s", readAmount, strerror(errno));
return -1;
}
/*
* Scan backward for the EOCD magic. In an archive without a trailing
* comment, we'll find it on the first try. (We may want to consider
* doing an initial minimal read; if we don't find it, retry with a
* second read as above.)
*/
int i;
for (i = readAmount - kEOCDLen; i >= 0; i--) {
if (scanBuf[i] == 0x50 && get4LE(&scanBuf[i]) == kEOCDSignature) {
LOGV("+++ Found EOCD at buf+%d", i);
break;
}
}
if (i < 0) {
LOGD("Zip: EOCD not found, %s is not zip", debugFileName);
return -1;
}
off_t eocdOffset = searchStart + i;
const u1* eocdPtr = scanBuf + i;
assert(eocdOffset < fileLength);
/*
* Grab the CD offset and size, and the number of entries in the
* archive. Verify that they look reasonable.
*/
u4 numEntries = get2LE(eocdPtr + kEOCDNumEntries);
u4 dirSize = get4LE(eocdPtr + kEOCDSize);
u4 dirOffset = get4LE(eocdPtr + kEOCDFileOffset);
if ((long long) dirOffset + (long long) dirSize > (long long) eocdOffset) {
LOGW("Zip: bad offsets (dir %ld, size %u, eocd %ld)",
(long) dirOffset, dirSize, (long) eocdOffset);
return -1;
}
if (numEntries == 0) {
LOGW("Zip: empty archive?");
return -1;
}
LOGV("+++ numEntries=%d dirSize=%d dirOffset=%d",
numEntries, dirSize, dirOffset);
/*
* It all looks good. Create a mapping for the CD, and set the fields
* in pArchive.
*/
if (sysMapFileSegmentInShmem(fd, dirOffset, dirSize,
&pArchive->mDirectoryMap) != 0)
{
LOGW("Zip: cd map failed");
return -1;
}
pArchive->mNumEntries = numEntries;
pArchive->mDirectoryOffset = dirOffset;
return 0;
}
int main(int argc, char** argv) {
// get file size
if( argc != 2) {
printf("usage: zip [zipfilename]\n");
return -1;
}
struct stat zipstat;
int ret = stat(argv[1], &zipstat);
if (ret != 0) {
printf("stat file(%s) failed, %s\n", argv[1], strerror(errno));
return -1;
}
long zipFileLength = zipstat.st_size;
// get EOCD
int fd = open(argv[1], O_RDONLY);
if (fd == -1) {
printf("can not open %s\n", argv[1]);
return -1;
}
unsigned char eocdBuffer[ENDHDR];
lseek(fd, zipFileLength - ENDHDR, SEEK_SET);
read(fd, eocdBuffer, ENDHDR);
unsigned int entrynum = get2LE(eocdBuffer + ENDSUB);
unsigned int entryoffset = get4LE(eocdBuffer + ENDOFF);
// search central directory area
lseek(fd, entryoffset, SEEK_SET);
int i = 0;
unsigned char cdBuffer[CENHDR];
uint32_t fileNameLen = 0;
uint32_t extraLen = 0;
uint32_t fileCommentLen = 0;
uint32_t u32offset = entryoffset;
char nameBuffer[PATH_MAX];
for(i = 0; i < entrynum; i++) {
printf("CD info offset: 0x%x\n", u32offset);
read(fd, cdBuffer, CENHDR);
uint32_t u32sig = get4LE(cdBuffer);
if (u32sig != 0x02014b50) {
printf("central directory sig error: 0x%x, expert 0x02014b50\n", u32sig);
close(fd);
return -1;
}
fileNameLen = get2LE(cdBuffer + CENNAM);
extraLen = get2LE(cdBuffer + CENEXT);
fileCommentLen = get2LE(cdBuffer + CENCOM);
printf("fileNameLen: %d, extraLen: %d, fileCommentLen: %d\n", fileNameLen, extraLen, fileCommentLen);
if (fileNameLen > PATH_MAX) {
printf("file name length(0x%x) should not larger than PATH_MAX\n", fileNameLen);
close(fd);
return -1;
}
read(fd, nameBuffer, fileNameLen);
nameBuffer[fileNameLen] = '\0';
printf("num %d file name: %s\n", i, nameBuffer);
// seek next central directory
u32offset += CENHDR + fileNameLen + extraLen + fileCommentLen;
lseek(fd, u32offset, SEEK_SET);
}
close(fd);
return 0;
}
/*
* Parses the Zip archive's Central Directory. Allocates and populates the
* hash table.
*
* Returns 0 on success.
*/
static int parseZipArchive(ZipArchive* pArchive)
{
int result = -1;
const u1* cdPtr = (const u1*)pArchive->mDirectoryMap.addr;
size_t cdLength = pArchive->mDirectoryMap.length;
int numEntries = pArchive->mNumEntries;
/*
* Create hash table. We have a minimum 75% load factor, possibly as
* low as 50% after we round off to a power of 2. There must be at
* least one unused entry to avoid an infinite loop during creation.
*/
pArchive->mHashTableSize = dexRoundUpPower2(1 + (numEntries * 4) / 3);
pArchive->mHashTable = (ZipHashEntry*)
calloc(pArchive->mHashTableSize, sizeof(ZipHashEntry));
/*
* Walk through the central directory, adding entries to the hash
* table and verifying values.
*/
const u1* ptr = cdPtr;
int i;
for (i = 0; i < numEntries; i++) {
if (get4LE(ptr) != kCDESignature) {
ALOGW("Zip: missed a central dir sig (at %d)", i);
goto bail;
}
if (ptr + kCDELen > cdPtr + cdLength) {
ALOGW("Zip: ran off the end (at %d)", i);
goto bail;
}
long localHdrOffset = (long) get4LE(ptr + kCDELocalOffset);
if (localHdrOffset >= pArchive->mDirectoryOffset) {
ALOGW("Zip: bad LFH offset %ld at entry %d", localHdrOffset, i);
goto bail;
}
unsigned int gpbf = get2LE(ptr + kCDEGPBFlags);
if ((gpbf & kGPFUnsupportedMask) != 0) {
ALOGW("Invalid General Purpose Bit Flag: %d", gpbf);
goto bail;
}
unsigned int nameLen, extraLen, commentLen, hash;
nameLen = get2LE(ptr + kCDENameLen);
extraLen = get2LE(ptr + kCDEExtraLen);
commentLen = get2LE(ptr + kCDECommentLen);
const char *name = (const char *) ptr + kCDELen;
/* Check name for NULL characters */
if (memchr(name, 0, nameLen) != NULL) {
ALOGW("Filename contains NUL byte");
goto bail;
}
/* add the CDE filename to the hash table */
hash = computeHash(name, nameLen);
addToHash(pArchive, name, nameLen, hash);
/* We don't care about the comment or extra data. */
ptr += kCDELen + nameLen + extraLen + commentLen;
if ((size_t)(ptr - cdPtr) > cdLength) {
ALOGW("Zip: bad CD advance (%d vs %zd) at entry %d",
(int) (ptr - cdPtr), cdLength, i);
goto bail;
}
}
ALOGV("+++ zip good scan %d entries", numEntries);
result = 0;
bail:
return result;
}
static int mapCentralDirectory0(int fd, const char* debugFileName,
ZipArchive* pArchive, off64_t fileLength, size_t readAmount, u1* scanBuf)
{
/*
* Make sure this is a Zip archive.
*/
if (lseek64(pArchive->mFd, 0, SEEK_SET) != 0) {
ALOGW("seek to start failed: %s", strerror(errno));
return false;
}
ssize_t actual = TEMP_FAILURE_RETRY(read(pArchive->mFd, scanBuf, sizeof(int32_t)));
if (actual != (ssize_t) sizeof(int32_t)) {
ALOGI("couldn't read first signature from zip archive: %s", strerror(errno));
return false;
}
unsigned int header = get4LE(scanBuf);
if (header != kLFHSignature) {
ALOGV("Not a Zip archive (found 0x%08x)\n", header);
return false;
}
/*
* Perform the traditional EOCD snipe hunt.
*
* We're searching for the End of Central Directory magic number,
* which appears at the start of the EOCD block. It's followed by
* 18 bytes of EOCD stuff and up to 64KB of archive comment. We
* need to read the last part of the file into a buffer, dig through
* it to find the magic number, parse some values out, and use those
* to determine the extent of the CD.
*
* We start by pulling in the last part of the file.
*/
off64_t searchStart = fileLength - readAmount;
if (lseek64(pArchive->mFd, searchStart, SEEK_SET) != searchStart) {
ALOGW("seek %ld failed: %s\n", (long) searchStart, strerror(errno));
return false;
}
actual = TEMP_FAILURE_RETRY(read(pArchive->mFd, scanBuf, readAmount));
if (actual != (ssize_t) readAmount) {
ALOGW("Zip: read %zd, expected %zd. Failed: %s\n",
actual, readAmount, strerror(errno));
return false;
}
/*
* Scan backward for the EOCD magic. In an archive without a trailing
* comment, we'll find it on the first try. (We may want to consider
* doing an initial minimal read; if we don't find it, retry with a
* second read as above.)
*/
int i;
for (i = readAmount - kEOCDLen; i >= 0; i--) {
if (scanBuf[i] == 0x50 && get4LE(&scanBuf[i]) == kEOCDSignature) {
ALOGV("+++ Found EOCD at buf+%d", i);
break;
}
}
if (i < 0) {
ALOGD("Zip: EOCD not found, %s is not zip", debugFileName);
return -1;
}
off64_t eocdOffset = searchStart + i;
const u1* eocdPtr = scanBuf + i;
assert(eocdOffset < fileLength);
/*
* Grab the CD offset and size, and the number of entries in the
* archive. Verify that they look reasonable.
*/
u4 diskNumber = get2LE(eocdPtr + kEOCDDiskNumber);
u4 diskWithCentralDir = get2LE(eocdPtr + kEOCDDiskNumberForCD);
u4 numEntries = get2LE(eocdPtr + kEOCDNumEntries);
u4 totalNumEntries = get2LE(eocdPtr + kEOCDTotalNumEntries);
u4 centralDirSize = get4LE(eocdPtr + kEOCDSize);
u4 centralDirOffset = get4LE(eocdPtr + kEOCDFileOffset);
u4 commentSize = get2LE(eocdPtr + kEOCDCommentSize);
// Verify that they look reasonable.
if ((long long) centralDirOffset + (long long) centralDirSize > (long long) eocdOffset) {
ALOGW("bad offsets (dir %ld, size %u, eocd %ld)\n",
(long) centralDirOffset, centralDirSize, (long) eocdOffset);
return false;
}
if (numEntries == 0) {
ALOGW("empty archive?\n");
return false;
} else if (numEntries != totalNumEntries || diskNumber != 0 || diskWithCentralDir != 0) {
ALOGW("spanned archives not supported");
return false;
}
// Check to see if comment is a sane size
if (((size_t) commentSize > (fileLength - kEOCDLen))
|| (eocdOffset > (fileLength - kEOCDLen) - commentSize)) {
ALOGW("comment size runs off end of file");
return false;
}
ALOGV("+++ numEntries=%d dirSize=%d dirOffset=%d\n",
numEntries, centralDirSize, centralDirOffset);
/*
* It all looks good. Create a mapping for the CD, and set the fields
* in pArchive.
*/
if (sysMapFileSegmentInShmem(fd, centralDirOffset, centralDirSize,
&pArchive->mDirectoryMap) != 0)
{
ALOGW("Zip: cd map failed");
return -1;
}
pArchive->mNumEntries = numEntries;
pArchive->mDirectoryOffset = centralDirOffset;
return 0;
}
