public static final int prev(byte[] b, int ptr, char chrA) {if (ptr == b.length)--ptr;while (ptr >= 0) {if (b[ptr--] == chrA)return ptr;}return ptr;}

public static final int prev ( byte [ ] b , int ptr , char chrA ) { if ( ptr == b . length ) -- ptr ; while ( ptr >= 0 ) { if ( b [ ptr -- ] == chrA ) return ptr ; } return ptr ; }
public static int Prev(byte[] b, int ptr, char chrA){if (ptr == b.Length){--ptr;}while (ptr >= 0){if (b[ptr--] == chrA){return ptr;}}return ptr;}
