/*

 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#ifdef WIN32_LEAN_AND_MEAN

typedef signed char byte ;

#endif

struct bytes {

  byte*  ptr;

  size_t len;

  byte*  limit() { return ptr+len; }

  void set(byte* ptr_, size_t len_) { ptr = ptr_; len = len_; }

  void set(const char* str)         { ptr = (byte*)str; len = strlen(str); }

  bool inBounds(const void* p);     // p in [ptr, limit)

  void malloc(size_t len_);

  void realloc(size_t len_);

  void free();

  void copyFrom(const void* ptr_, size_t len_, size_t offset = 0);

  void saveFrom(const void* ptr_, size_t len_);

  void saveFrom(const char* str) { saveFrom(str, strlen(str)); }

  void copyFrom(bytes& other, size_t offset = 0) {

    copyFrom(other.ptr, other.len, offset);

  }

  void saveFrom(bytes& other) {

    saveFrom(other.ptr, other.len);

  }

  void clear(int fill_byte = 0) { memset(ptr, fill_byte, len); }

  byte* writeTo(byte* bp);

  bool equals(bytes& other) { return 0 == compareTo(other); }

  int compareTo(bytes& other);

  bool contains(byte c) { return indexOf(c) >= 0; }

  int indexOf(byte c);

  // substrings:

  static bytes of(byte* ptr, size_t len) {

    bytes res;

    res.set(ptr, len);

    return res;

  }

  bytes slice(size_t beg, size_t end) {

    bytes res;

    res.ptr = ptr + beg;

    res.len = end - beg;

    assert(res.len == 0 || inBounds(res.ptr) && inBounds(res.limit()-1));

    return res;

  }

  // building C strings inside byte buffers:

  bytes& strcat(const char* str) { ::strcat((char*)ptr, str); return *this; }

  bytes& strcat(bytes& other) { ::strncat((char*)ptr, (char*)other.ptr, other.len); return *this; }

  char* strval() { assert(strlen((char*)ptr) == len); return (char*) ptr; }

#ifdef PRODUCT

  const char* string() { return 0; }

#else

  const char* string();

#endif

};

#define BYTES_OF(var) (bytes::of((byte*)&(var), sizeof(var)))

struct fillbytes {

  bytes b;

  size_t allocated;

  byte*  base()               { return b.ptr; }

  size_t size()               { return b.len; }

  byte*  limit()              { return b.limit(); }          // logical limit

  void   setLimit(byte* lp)   { assert(isAllocated(lp)); b.len = lp - b.ptr; }

  byte*  end()                { return b.ptr + allocated; }  // physical limit

  byte*  loc(size_t o)        { assert(o < b.len); return b.ptr + o; }

  void   init()               { allocated = 0; b.set(null, 0); }

  void   init(size_t s)       { init(); ensureSize(s); }

  void   free()               { if (allocated != 0) b.free(); allocated = 0; }

  void   empty()              { b.len = 0; }

  byte*  grow(size_t s);      // grow so that limit() += s

  int    getByte(uint i)      { return *loc(i) & 0xFF; }

  void   addByte(byte x)      { *grow(1) = x; }

  void   ensureSize(size_t s); // make sure allocated >= s

  void   trimToSize()         { if (allocated > size())  b.realloc(allocated = size()); }

  bool   canAppend(size_t s)  { return allocated > b.len+s; }

  bool   isAllocated(byte* p) { return p >= base() && p <= end(); } //asserts

  void   set(bytes& src)      { set(src.ptr, src.len); }

  void set(byte* ptr, size_t len) {

    b.set(ptr, len);

    allocated = 0;   // mark as not reallocatable

  }

  // block operations on resizing byte buffer:

  fillbytes& append(const void* ptr_, size_t len_)

    { memcpy(grow(len_), ptr_, len_); return (*this); }

  fillbytes& append(bytes& other)

    { return append(other.ptr, other.len); }

  fillbytes& append(const char* str)

    { return append(str, strlen(str)); }

};

struct ptrlist : fillbytes {

  typedef const void* cvptr;

  int    length()     { return (int)(size() / sizeof(cvptr)); }

  cvptr* base()       { return (cvptr*) fillbytes::base(); }

  cvptr& get(int i)   { return *(cvptr*)loc(i * sizeof(cvptr)); }

  cvptr* limit()      { return (cvptr*) fillbytes::limit(); }

  void   add(cvptr x) { *(cvptr*)grow(sizeof(x)) = x; }

  void   popTo(int l) { assert(l <= length()); b.len = l * sizeof(cvptr); }

  int    indexOf(cvptr x);

  bool   contains(cvptr x) { return indexOf(x) >= 0; }

  void   freeAll();   // frees every ptr on the list, plus the list itself

};

// Use a macro rather than mess with subtle mismatches

// between member and non-member function pointers.

#define PTRLIST_QSORT(ptrls, fn) \

  ::qsort((ptrls).base(), (ptrls).length(), sizeof(void*), fn)

struct intlist : fillbytes {

  int    length()     { return (int)(size() / sizeof(int)); }

  int*   base()       { return (int*) fillbytes::base(); }

  int&   get(int i)   { return *(int*)loc(i * sizeof(int)); }

  int*   limit()      { return (int*) fillbytes::limit(); }

  void   add(int x)   { *(int*)grow(sizeof(x)) = x; }

  void   popTo(int l) { assert(l <= length()); b.len = l * sizeof(int); }

  int    indexOf(int x);

  bool   contains(int x) { return indexOf(x) >= 0; }

};