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bug 52949,59830: move module storage and decompressing into a standalone function 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1751987 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2016-07-09 08:18:29 +00:00
parent 50e4a82230
commit c220067619
1 changed files with 34 additions and 15 deletions
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49
src/java/org/apache/poi/poifs/macros/VBAMacroReader.java
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@ -172,6 +172,39 @@ public class VBAMacroReader implements Closeable {
return new String(buffer, 0, count, charset);
}
/**
* reads module from input stream and adds it to the modules map for decompression later
* on the second pass through this function, the module will be decompressed
*
* Side-effects: adds a new module to the module map or sets the buf field on the module
* to the decompressed stream contents (the VBA code for one module)
*
* @param in the run-length encoded input stream to read from
* @param streamName the stream name of the module
* @param modules a map to store the modules
* @throws IOException
*/
private static void readModule(RLEDecompressingInputStream in, String streamName, ModuleMap modules) throws IOException {
int moduleOffset = in.readInt();
Module module = modules.get(streamName);
// First time we've seen the module. Add it to the ModuleMap and decompress it later
if (module == null) {
module = new Module();
module.offset = moduleOffset;
modules.put(streamName, module);
}
// Decompress a previously found module and store the decompressed result into module.buf
else {
ByteArrayOutputStream out = new ByteArrayOutputStream();
RLEDecompressingInputStream stream = new RLEDecompressingInputStream(new ByteArrayInputStream(
module.buf, moduleOffset, module.buf.length - moduleOffset));
IOUtils.copy(stream, out);
stream.close();
out.close();
module.buf = out.toByteArray();
}
}
/**
* Skips <tt>n</tt> bytes in an input stream, throwing IOException if the
* number of bytes skipped is different than requested.
@ -243,21 +276,7 @@ public class VBAMacroReader implements Closeable {
streamName = readString(in, recordLength, modules.charset);
break;
case MODULEOFFSET:
int moduleOffset = in.readInt();
Module module = modules.get(streamName);
if (module != null) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
RLEDecompressingInputStream stream = new RLEDecompressingInputStream(new ByteArrayInputStream(
module.buf, moduleOffset, module.buf.length - moduleOffset));
IOUtils.copy(stream, out);
stream.close();
out.close();
module.buf = out.toByteArray();
} else {
module = new Module();
module.offset = moduleOffset;
modules.put(streamName, module);
}
readModule(in, streamName, modules);
break;
default:
trySkip(in, recordLength);