private void fillImageContent() {
byte[] rawContent = getRawContent();
// HACK: Detect compressed images. In reality there should be some way to determine
// this from the first 32 bytes, but I can't see any similarity between all the
// samples I have obtained, nor any similarity in the data block contents.
if (matchSignature(rawContent, COMPRESSED1, 32)
|| matchSignature(rawContent, COMPRESSED2, 32)) {
try {
InflaterInputStream in =
new InflaterInputStream(
new ByteArrayInputStream(rawContent, 33, rawContent.length - 33));
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[4096];
int readBytes;
while ((readBytes = in.read(buf)) > 0) {
out.write(buf, 0, readBytes);
}
content = out.toByteArray();
} catch (IOException e) {
// Problems reading from the actual ByteArrayInputStream should never happen
// so this will only ever be a ZipException.
log.log(POILogger.INFO, "Possibly corrupt compression or non-compressed data", e);
}
} else {
// Raw data is not compressed.
content = rawContent;
}
}
private static String decodeFileName(String encodedUrl) {
/* see "MICROSOFT OFFICE EXCEL 97-2007 BINARY FILE FORMAT SPECIFICATION" */
StringBuilder sb = new StringBuilder();
for (int i = 1; i < encodedUrl.length(); i++) {
char c = encodedUrl.charAt(i);
switch (c) {
case CH_VOLUME:
char driveLetter = encodedUrl.charAt(++i);
if (driveLetter == '@') {
sb.append("\\\\");
} else {
// Windows notation for drive letters
sb.append(driveLetter).append(":");
}
break;
case CH_SAME_VOLUME:
sb.append(PATH_SEPERATOR);
break;
case CH_DOWN_DIR:
sb.append(PATH_SEPERATOR);
break;
case CH_UP_DIR:
sb.append("..").append(PATH_SEPERATOR);
break;
case CH_LONG_VOLUME:
// Don't known to handle...
logger.log(POILogger.WARN, "Found unexpected key: ChLongVolume - IGNORING");
break;
case CH_STARTUP_DIR:
case CH_ALT_STARTUP_DIR:
case CH_LIB_DIR:
logger.log(POILogger.WARN, "EXCEL.EXE path unkown - using this directoy instead: .");
sb.append(".").append(PATH_SEPERATOR);
break;
default:
sb.append(c);
}
}
return sb.toString();
}
