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string stream extract - simplify file reads

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adam-m 2012-08-01 14:49:46 -04:00
parent f78dfc09df
commit 8a007e8fe1
1 changed files with 16 additions and 15 deletions
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31
KeywordSearch/src/org/sleuthkit/autopsy/keywordsearch/AbstractFileStringIntStream.java
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@ -106,23 +106,24 @@ public class AbstractFileStringIntStream extends InputStream {
try {
//convert more strings, store in buffer
long toRead = 0;
int shiftSize = 0;
if (lastExtractResult != null && lastExtractResult.getTextLength() != 0
&& (shiftSize = FILE_BUF_SIZE - lastExtractResult.getFirstUnprocessedOff()) > 0) {
//a string previously extracted
//shift the fileReadBuff past last bytes extracted
//read only what's needed to fill the buffer
//to avoid losing chars and breaking or corrupting potential strings - preserve byte stream continuity
byte[] temp = new byte[shiftSize];
System.arraycopy(fileReadBuff, lastExtractResult.getFirstUnprocessedOff(),
temp, 0, shiftSize);
System.arraycopy(temp, 0, fileReadBuff, 0, shiftSize);
toRead = Math.min(lastExtractResult.getFirstUnprocessedOff(), fileSize - fileReadOffset);
lastExtractResult = null;
} else {
//int shiftSize = 0;
//if (lastExtractResult != null && lastExtractResult.getTextLength() != 0
// && (shiftSize = FILE_BUF_SIZE - lastExtractResult.getFirstUnprocessedOff()) > 0) {
////a string previously extracted
////shift the fileReadBuff past last bytes extracted
////read only what's needed to fill the buffer
////to avoid loosing chars and breaking or corrupting potential strings - preserve byte stream continuity
//byte[] temp = new byte[shiftSize];
//System.arraycopy(fileReadBuff, lastExtractResult.getFirstUnprocessedOff(),
// temp, 0, shiftSize);
//System.arraycopy(temp, 0, fileReadBuff, 0, shiftSize);
//toRead = Math.min(lastExtractResult.getFirstUnprocessedOff(), fileSize - fileReadOffset);
//lastExtractResult = null;
//} else {
//fill up entire fileReadBuff fresh
toRead = Math.min(FILE_BUF_SIZE, fileSize - fileReadOffset);
}
//}
int read = content.read(fileReadBuff, fileReadOffset, toRead);
if (read == -1 || read == 0) {
fileEOF = true;