https://issues.apache.org/bugzilla/show_bug.cgi?id=51318
Bug #: 51318
Summary: Exceptions in NDocumentInputStream preventing
streaming of data out of MS Publisher files
Product: POI
Version: 3.2-FINAL
Platform: All
OS/Version: All
Status: NEW
Severity: critical
Priority: P2
Component: HPBF
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Related to 51317 - Need ability to stream and chunk data out of MS Publisher
documents.
I attempted to implement streaming and chunking of data out of pub files and
got errors as below.
Basically I attempted to read from DocumentInputStream in chunks, in
succession, rather than read in the whole stream into a large preallocated byte
array.
byte[] filler = new byte[25];
byte[] bytes = new byte[8];
int read = dis.read(bytes, 0, 8);
if (read <= 0) {
//
} else {
String f8 = new String(bytes);
if (!f8.equals("CHNKINK ")) {
throw new IllegalArgumentException("Expecting 'CHNKINK ' but was '" +
f8 + "'");
}
// Ignore the next 24, for now at least
dis.read(filler, 8, 24);
for (int i = 0; i < 20; i++) {
int offset = 0x20 + i * 24;
bytes = new byte[25];
read = dis.read(bytes, offset, bytes.length);
Note the line which attempts to read the filler 24 bytes so we can get to the
bits. I had to try it there because was getting error simply trying to do
read(bytes, offset, bytes.length).
Errors are all like this first:
Exception in thread "main" java.lang.IndexOutOfBoundsException: can't read past
buffer boundaries
at
org.apache.poi.poifs.filesystem.NDocumentInputStream.read(NDocumentInputStream.java:142)
at
org.apache.poi.poifs.filesystem.DocumentInputStream.read(DocumentInputStream.java:118)
Now, if we examine NDocumentInputStream.read(byte[], int, int), there is a
conditional there:
if (off < 0 || len < 0 || b.length < off + len) {
This assumes that the byte array is large and you're going in sequence. If you
want to jump around you'd presumably want to check b.length < len.
Tried that. Got the next error as follows:
Exception in thread "main" java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkBounds(Buffer.java:530)
at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:125)
at
org.apache.poi.poifs.filesystem.NDocumentInputStream.readFully(NDocumentInputStream.java:250)
at
org.apache.poi.poifs.filesystem.NDocumentInputStream.read(NDocumentInputStream.java:151)
at
org.apache.poi.poifs.filesystem.DocumentInputStream.read(DocumentInputStream.java:118)
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