org.robolectric.res.android.FileMap Maven / Gradle / Ivy
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An alternative Android testing framework.
package org.robolectric.res.android;
import static org.robolectric.res.android.Asset.toIntExact;
import static org.robolectric.res.android.Util.ALOGV;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class FileMap {
private ZipFile zipFile;
private ZipEntry zipEntry;
private boolean readOnly;
private int fd;
private boolean isFromZip;
// Create a new mapping on an open file.
//
// Closing the file descriptor does not unmap the pages, so we don't
// claim ownership of the fd.
//
// Returns "false" on failure.
boolean create(String origFileName, int fd, long offset, int length,
boolean readOnly)
{
this.mFileName = origFileName;
this.fd = fd;
this.mDataOffset = offset;
this.readOnly = readOnly;
return true;
}
// #if defined(__MINGW32__)
// int adjust;
// off64_t adjOffset;
// size_t adjLength;
//
// if (mPageSize == -1) {
// SYSTEM_INFO si;
//
// GetSystemInfo( &si );
// mPageSize = si.dwAllocationGranularity;
// }
//
// DWORD protect = readOnly ? PAGE_READONLY : PAGE_READWRITE;
//
// mFileHandle = (HANDLE) _get_osfhandle(fd);
// mFileMapping = CreateFileMapping( mFileHandle, NULL, protect, 0, 0, NULL);
// if (mFileMapping == NULL) {
// ALOGE("CreateFileMapping(%s, %" PRIx32 ") failed with error %" PRId32 "\n",
// mFileHandle, protect, GetLastError() );
// return false;
// }
//
// adjust = offset % mPageSize;
// adjOffset = offset - adjust;
// adjLength = length + adjust;
//
// mBasePtr = MapViewOfFile( mFileMapping,
// readOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS,
// 0,
// (DWORD)(adjOffset),
// adjLength );
// if (mBasePtr == NULL) {
// ALOGE("MapViewOfFile(%" PRId64 ", 0x%x) failed with error %" PRId32 "\n",
// adjOffset, adjLength, GetLastError() );
// CloseHandle(mFileMapping);
// mFileMapping = INVALID_HANDLE_VALUE;
// return false;
// }
// #else // !defined(__MINGW32__)
// int prot, flags, adjust;
// off64_t adjOffset;
// size_t adjLength;
//
// void* ptr;
//
// assert(fd >= 0);
// assert(offset >= 0);
// assert(length > 0);
//
// // init on first use
// if (mPageSize == -1) {
// mPageSize = sysconf(_SC_PAGESIZE);
// if (mPageSize == -1) {
// ALOGE("could not get _SC_PAGESIZE\n");
// return false;
// }
// }
//
// adjust = offset % mPageSize;
// adjOffset = offset - adjust;
// adjLength = length + adjust;
//
// flags = MAP_SHARED;
// prot = PROT_READ;
// if (!readOnly)
// prot |= PROT_WRITE;
//
// ptr = mmap(NULL, adjLength, prot, flags, fd, adjOffset);
// if (ptr == MAP_FAILED) {
// ALOGE("mmap(%lld,0x%x) failed: %s\n",
// (long long)adjOffset, adjLength, strerror(errno));
// return false;
// }
// mBasePtr = ptr;
// #endif // !defined(__MINGW32__)
//
// mFileName = origFileName != NULL ? strdup(origFileName) : NULL;
// mBaseLength = adjLength;
// mDataOffset = offset;
// mDataPtr = (char*) mBasePtr + adjust;
// mDataLength = length;
//
// assert(mBasePtr != NULL);
//
// ALOGV("MAP: base %s/0x%x data %s/0x%x\n",
// mBasePtr, mBaseLength, mDataPtr, mDataLength);
//
// return true;
// }
public boolean createFromZip(String origFileName, ZipFile zipFile, ZipEntry entry, int length,
boolean readOnly) {
isFromZip = true;
this.zipFile = zipFile;
this.zipEntry = entry;
int prot, flags, adjust;
long adjOffset;
int adjLength;
int ptr;
long offset = guessOffsetFor(zipFile, entry);
assert(fd >= 0);
assert(offset >= 0);
// assert(length > 0);
// init on first use
// if (mPageSize == -1) {
// mPageSize = sysconf(_SC_PAGESIZE);
// if (mPageSize == -1) {
// ALOGE("could not get _SC_PAGESIZE\n");
// return false;
// }
// }
// adjust = Math.toIntExact(offset % mPageSize);
// adjOffset = offset - adjust;
// adjLength = length + adjust;
//flags = MAP_SHARED;
//prot = PROT_READ;
//if (!readOnly)
// prot |= PROT_WRITE;
// ptr = mmap(null, adjLength, prot, flags, fd, adjOffset);
// if (ptr == MAP_FAILED) {
// ALOGE("mmap(%lld,0x%x) failed: %s\n",
// (long long)adjOffset, adjLength, strerror(errno));
// return false;
// }
// mBasePtr = ptr;
mFileName = origFileName != null ? origFileName : null;
//mBaseLength = adjLength;
mDataOffset = offset;
//mDataPtr = mBasePtr + adjust;
mDataLength = toIntExact(entry.getSize());
//assert(mBasePtr != 0);
ALOGV("MAP: base %s/0x%x data %s/0x%x\n",
mBasePtr, mBaseLength, mDataPtr, mDataLength);
return true;
}
long guessOffsetFor(ZipFile zipFile, ZipEntry zipEntry) {
Enumeration zipEntries = zipFile.entries();
long offset = 0;
while (zipEntries.hasMoreElements())
{
ZipEntry entry = zipEntries.nextElement();
long fileSize = 0;
long extra = entry.getExtra() == null ? 0 : entry.getExtra().length;
offset += 30 + entry.getName().length() + extra;
if (entry.getName().equals(zipEntry.getName())) {
return offset;
}
if(!entry.isDirectory())
{
fileSize = entry.getCompressedSize();
// Do stuff here with fileSize & offset
}
offset += fileSize;
}
throw new IllegalStateException("'" + zipEntry.getName() + "' not found");
}
/*
* This represents a memory-mapped file. It might be the entire file or
* only part of it. This requires a little bookkeeping because the mapping
* needs to be aligned on page boundaries, and in some cases we'd like to
* have multiple references to the mapped area without creating additional
* maps.
*
* This always uses MAP_SHARED.
*
* TODO: we should be able to create a new FileMap that is a subset of
* an existing FileMap and shares the underlying mapped pages. Requires
* completing the refcounting stuff and possibly introducing the notion
* of a FileMap hierarchy.
*/
// class FileMap {
// public:
// FileMap(void);
//
// FileMap(FileMap&& f);
// FileMap& operator=(FileMap&& f);
/*
* Create a new mapping on an open file.
*
* Closing the file descriptor does not unmap the pages, so we don't
* claim ownership of the fd.
*
* Returns "false" on failure.
*/
// boolean create(String origFileName, int fd,
// long offset, int length, boolean readOnly) {
// }
// ~FileMap(void);
/*
* Return the name of the file this map came from, if known.
*/
String getFileName() { return mFileName; }
/*
* Get a pointer to the piece of the file we requested.
*/
synchronized byte[] getDataPtr() {
if (mDataPtr == null) {
mDataPtr = new byte[mDataLength];
InputStream is;
try {
if (isFromZip) {
is = zipFile.getInputStream(zipEntry);
} else {
is = new FileInputStream(getFileName());
}
try {
readFully(is, mDataPtr);
} finally {
is.close();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return mDataPtr;
}
public static void readFully(InputStream is, byte[] bytes) throws IOException {
int size = bytes.length;
int remaining = size;
while (remaining > 0) {
int location = size - remaining;
int bytesRead = is.read(bytes, location, remaining);
if (bytesRead == -1) {
break;
}
remaining -= bytesRead;
}
if (remaining > 0) {
throw new RuntimeException("failed to read " + size + " (" + remaining + " bytes unread)");
}
}
/*
* Get the length we requested.
*/
int getDataLength() { return mDataLength; }
/*
* Get the data offset used to create this map.
*/
long getDataOffset() { return mDataOffset; }
public ZipEntry getZipEntry() {
return zipEntry;
}
// /*
// * This maps directly to madvise() values, but allows us to avoid
// * including everywhere.
// */
// enum MapAdvice {
// NORMAL, RANDOM, SEQUENTIAL, WILLNEED, DONTNEED
// };
//
// /*
// * Apply an madvise() call to the entire file.
// *
// * Returns 0 on success, -1 on failure.
// */
// int advise(MapAdvice advice);
//
// protected:
//
// private:
// // these are not implemented
// FileMap(const FileMap& src);
// const FileMap& operator=(const FileMap& src);
//
String mFileName; // original file name, if known
int mBasePtr; // base of mmap area; page aligned
int mBaseLength; // length, measured from "mBasePtr"
long mDataOffset; // offset used when map was created
byte[] mDataPtr; // start of requested data, offset from base
int mDataLength; // length, measured from "mDataPtr"
static long mPageSize;
@Override
public String toString() {
if (isFromZip) {
return "FileMap{" +
"zipFile=" + zipFile.getName() +
", zipEntry=" + zipEntry +
'}';
} else {
return "FileMap{" +
"mFileName='" + mFileName + '\'' +
'}';
}
}
}
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