/**
* Gets the relative path of <code>file</code> to its <code>ancestor</code>. Uses <code>separator
* </code> for separating files.
*
* @param file the file
* @param ancestor parent file
* @param separator character to use as files separator
* @return the relative path or {@code null} if {@code ancestor} is not ancestor for {@code file}
*/
@Nullable
public static String getRelativePath(
@NotNull VirtualFile file, @NotNull VirtualFile ancestor, char separator) {
if (!file.getFileSystem().equals(ancestor.getFileSystem())) return null;
int length = 0;
VirtualFile parent = file;
while (true) {
if (parent == null) return null;
if (parent.equals(ancestor)) break;
if (length > 0) {
length++;
}
length += parent.getName().length();
parent = parent.getParent();
}
char[] chars = new char[length];
int index = chars.length;
parent = file;
while (true) {
if (parent.equals(ancestor)) break;
if (index < length) {
chars[--index] = separator;
}
String name = parent.getName();
for (int i = name.length() - 1; i >= 0; i--) {
chars[--index] = name.charAt(i);
}
parent = parent.getParent();
}
return StringFactory.createShared(chars);
}
@NotNull
public static String loadTextAndClose(@NotNull Reader reader) throws IOException {
try {
return StringFactory.createShared(adaptiveLoadText(reader));
} finally {
reader.close();
}
}
@NotNull
public static String loadText(@NotNull VirtualFile file, int length) throws IOException {
InputStreamReader reader = new InputStreamReader(file.getInputStream(), file.getCharset());
try {
return StringFactory.createShared(FileUtil.loadText(reader, length));
} finally {
reader.close();
}
}
public static String encode(@NotNull byte[] octetString) {
int bits24;
int bits6;
char[] out = new char[((octetString.length - 1) / 3 + 1) * 4];
int outIndex = 0;
int i = 0;
while ((i + 3) <= octetString.length) {
// store the octets
bits24 = (octetString[i++] & 0xFF) << 16;
bits24 |= (octetString[i++] & 0xFF) << 8;
bits24 |= (octetString[i++] & 0xFF);
bits6 = (bits24 & 0x00FC0000) >> 18;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x0003F000) >> 12;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x00000FC0) >> 6;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x0000003F);
out[outIndex++] = alphabet[bits6];
}
if (octetString.length - i == 2) {
// store the octets
bits24 = (octetString[i] & 0xFF) << 16;
bits24 |= (octetString[i + 1] & 0xFF) << 8;
bits6 = (bits24 & 0x00FC0000) >> 18;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x0003F000) >> 12;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x00000FC0) >> 6;
out[outIndex++] = alphabet[bits6];
// padding
out[outIndex] = '=';
} else if (octetString.length - i == 1) {
// store the octets
bits24 = (octetString[i] & 0xFF) << 16;
bits6 = (bits24 & 0x00FC0000) >> 18;
out[outIndex++] = alphabet[bits6];
bits6 = (bits24 & 0x0003F000) >> 12;
out[outIndex++] = alphabet[bits6];
// padding
out[outIndex++] = '=';
out[outIndex] = '=';
}
return StringFactory.createShared(out);
}
@NotNull
private static String createSequence(@NotNull CharSequence text, int startOffset, int endOffset) {
if (text instanceof String) {
return ((String) text).substring(startOffset, endOffset);
}
char[] buf = new char[endOffset - startOffset];
CharArrayUtil.getChars(text, buf, startOffset, 0, buf.length);
return StringFactory.createShared(
buf); // this way the .toString() doesn't create another instance (as opposed to new
// CharArrayCharSequence())
}