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Add alternative constructor

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Add constructor that can use a bytestream so we can parse a DexFile
completely in memory
This commit is contained in:
Ryan Welton 2013-09-19 23:42:19 -04:00
parent a0c24f1c9f
commit 4ab8df84b0
1 changed files with 60 additions and 42 deletions
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102
dexlib/src/main/java/org/jf/dexlib/DexFile.java
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@ -278,51 +278,72 @@ public class DexFile
* @see #getPreserveSignedRegisters
* @throws IOException if an IOException occurs
*/
public DexFile(File file, boolean preserveSignedRegisters, boolean skipInstructions)
public DexFile(File file, boolean preserveSignedRegisters, boolean skipInstructions) throws IOException {
this(preserveSignedRegisters, skipInstructions);
InputStream dexFileInputStream = null;
ZipFile zipFile = null;
byte[] magic = FileUtils.readFile(file, 0, 8);
long fileLength;
//do we have a zip file?
if (magic[0] == 0x50 && magic[1] == 0x4B) {
zipFile = new ZipFile(file);
ZipEntry zipEntry = zipFile.getEntry("classes.dex");
if (zipEntry == null) {
throw new NoClassesDexException("zip file " + file.getName() + " does not contain a classes.dex " +
"file");
}
fileLength = zipEntry.getSize();
if (fileLength < 40) {
throw new RuntimeException("The classes.dex file in " + file.getName() + " is too small to be a" +
" valid dex file");
} else if (fileLength > Integer.MAX_VALUE) {
throw new RuntimeException("The classes.dex file in " + file.getName() + " is too large to read in");
}
dexFileInputStream = new BufferedInputStream(zipFile.getInputStream(zipEntry));
} else {
fileLength = file.length();
if (fileLength < 40) {
throw new RuntimeException(file.getName() + " is too small to be a valid dex file");
}
if (fileLength < 40) {
throw new RuntimeException(file.getName() + " is too small to be a valid dex file");
} else if (fileLength > Integer.MAX_VALUE) {
throw new RuntimeException(file.getName() + " is too large to read in");
}
dexFileInputStream = new FileInputStream(file);
}
intializeHelper(dexFileInputStream,fileLength,preserveSignedRegisters,skipInstructions);
}
/**
* Construct a new DexFile instance from a given input stream,
* and optionally keep track of any registers in the debug information that are signed,
* so they will be written in the same format.
* @param dexFileInputStream The dex file to read in
* @param dexFileLength length of the dex file to be read
* @param preserveSignedRegisters If true, keep track of any registers in the debug information
* that are signed, so they will be written in the same format.
* @param skipInstructions If true, skip the instructions in any code item.
* @see #getPreserveSignedRegisters
* @throws IOException if an IOException occurs
*/
public DexFile(InputStream dexFileInputStream, long dexFileLength, boolean preserveSignedRegisters, boolean skipInstructions)
throws IOException {
this(preserveSignedRegisters, skipInstructions);
intializeHelper(dexFileInputStream, dexFileLength, preserveSignedRegisters,skipInstructions);
}
long fileLength;
byte[] magic = FileUtils.readFile(file, 0, 8);
InputStream inputStream = null;
private void intializeHelper(InputStream inputStream, long dexFileLength, boolean preserveSignedRegisters, boolean skipInstructions)
throws IOException {
Input in = null;
ZipFile zipFile = null;
try {
//do we have a zip file?
if (magic[0] == 0x50 && magic[1] == 0x4B) {
zipFile = new ZipFile(file);
ZipEntry zipEntry = zipFile.getEntry("classes.dex");
if (zipEntry == null) {
throw new NoClassesDexException("zip file " + file.getName() + " does not contain a classes.dex " +
"file");
}
fileLength = zipEntry.getSize();
if (fileLength < 40) {
throw new RuntimeException("The classes.dex file in " + file.getName() + " is too small to be a" +
" valid dex file");
} else if (fileLength > Integer.MAX_VALUE) {
throw new RuntimeException("The classes.dex file in " + file.getName() + " is too large to read in");
}
inputStream = new BufferedInputStream(zipFile.getInputStream(zipEntry));
byte[] magic = new byte[8];
int magicRead = inputStream.read(magic);
inputStream.mark(8);
for (int i=0; i<8; i++) {
magic[i] = (byte)inputStream.read();
}
inputStream.reset();
} else {
fileLength = file.length();
if (fileLength < 40) {
throw new RuntimeException(file.getName() + " is too small to be a valid dex file");
}
if (fileLength < 40) {
throw new RuntimeException(file.getName() + " is too small to be a valid dex file");
} else if (fileLength > Integer.MAX_VALUE) {
throw new RuntimeException(file.getName() + " is too large to read in");
}
inputStream = new FileInputStream(file);
if(magicRead < 8){
throw new RuntimeException("Error reading Magic bytes");
}
byte[] dexMagic, odexMagic;
@ -367,7 +388,7 @@ public class DexFile
odexDependencies = new OdexDependencies(
new ByteArrayInput(FileUtils.readStream(inputStream, odexHeader.depsLength)));
} else if (isDex) {
in = new ByteArrayInput(FileUtils.readStream(inputStream, (int)fileLength));
in = new ByteArrayInput(FileUtils.readStream(inputStream, (int)dexFileLength));
} else {
StringBuffer sb = new StringBuffer("bad magic value:");
for (int i=0; i<8; i++) {
@ -380,9 +401,6 @@ public class DexFile
if (inputStream != null) {
inputStream.close();
}
if (zipFile != null) {
zipFile.close();
}
}
ReadContext readContext = new ReadContext();