Here's some code to test in ResourcesMojo to try and sniff binary files
out from text without looking at extensions...
Have a play, let me know if it is useful.
Regards,
John
private void copyFile(File from, final File to, boolean filtering)
throws IOException {
FileUtils.FilterWrapper[] wrappers = null;
if (filtering && isTextFile(from)) {
...
/**
* Attempt to determine if a file is text or binary by examining for
a BOM
* or unprintable ASCII characters.
*
* @param file a file to test
* @return true if the file is a text file
*/
private final boolean isTextFile(File file) {
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
byte[] bom = new byte[4];
int read = fis.read(bom);
/** Try to detect these BOM formats which all indicate a
text file
*
* 00 00 FE FF UTF-32, big-endian
* FF FE 00 00 UTF-32, little-endian
* EF BB BF UTF-8
* FE FF UTF-16, big-endian
* FF FE UTF-16, little-endian
*/
if (read == 4) {
if ((bom[0] == 0x00 && bom[1] == 0x00 && bom[2] == 0xFE
&& bom[3] == 0xFF)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + "
UTF-32BE encoded");
}
return true;
}
if ((bom[0] == 0xFF && bom[1] == 0xFE && bom[2] == 0x00
&& bom[3] == 0x00)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + "
UTF-32LE encoded");
}
return true;
}
}
if (read >= 3) {
if ((bom[0] == 0xEF && bom[1] == 0xBB && bom[2] ==
0xBF)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + " UTF-8
encoded");
}
return true;
}
}
if (read >= 2) {
if ((bom[0] == 0xFE && bom[1] == 0xFF)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + "
UTF-16BE encoded");
}
return true;
}
if ((bom[0] == 0xFF && bom[1] == 0xFE)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + "
UTF-32LE encoded");
}
return true;
}
}
/** Check some bytes to see if there are unprintable ASCII
chars and
if there are, then this is probably a binary file.
*/
for (int b = 0; b < read; b++) {
if (isNotASCIIChar(bom[b] & 0xFF)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + " binary
encoded");
}
return false;
}
}
int inchar = -1, ccount = 0;
while ((inchar = fis.read()) != -1 && ccount++ < 1024) {
if (isNotASCIIChar(inchar)) {
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + " binary
encoded");
}
return false;
}
}
} catch (IOException ex) {
getLog().debug(ex);
} finally {
if (fis != null) {
try {
fis.close();
} catch (Exception ex) {
// ignore
}
}
}
if (getLog().isDebugEnabled()) {
getLog().debug(file.getAbsolutePath() + " ASCII encoded");
}
return true;
}
private static final boolean isNotASCIIChar(int inchar) {
return inchar < 0 || (inchar >= 0 && inchar <= 0x1F && inchar !=
0x09 && inchar != 0x0A && inchar != 0x0C && inchar != 0x0D && inchar !=
0x1A) || inchar == 0x7F;
}
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