// Derived from:

/* $OpenBSD: buffer.h,v 1.17 2008/05/08 06:59:01 markus Exp $ */

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Code for manipulating FIFO buffers.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#ifndef BUFFER_H
#define BUFFER_H

#ifndef roundup
#define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))  /* to any y */
#endif

#ifndef MAX
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
#endif

#ifndef MIN
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#endif

typedef struct {
  u_char  *buf;   /* Buffer for data. */
  u_int  alloc;   /* Number of bytes allocated for data. */
  u_int  offset;  /* Offset of first byte containing data. */
  u_int  end;     /* Offset of last byte containing data. */
  u_int  cache;   /* bit cache for buffer_get_bits */
  u_int  ncached; /* Number of bits in cache */
} Buffer;

enum utf16_byteorder {
  UTF16_BYTEORDER_ANY,
  UTF16_BYTEORDER_BE,
  UTF16_BYTEORDER_LE
};

const uint32_t CacheMask[33] = {
  0x0, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f,
  0xff, 0x1ff, 0x3ff, 0x7ff, 0xfff, 0x1fff, 0x3fff, 0x7fff,
  0xffff, 0x1ffff, 0x3ffff, 0x7ffff, 0xfffff, 0x1fffff, 0x3fffff, 0x7fffff,
  0xffffff, 0x1ffffff, 0x3ffffff, 0x7ffffff, 0xfffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
  0xffffffff
};

void buffer_init(Buffer *buffer, uint32_t len);
void buffer_init_or_clear(Buffer *buffer, uint32_t len);
void buffer_free(Buffer *buffer);
void buffer_clear(Buffer *buffer);
void buffer_append(Buffer *buffer, const void *data, uint32_t len);
static int buffer_compact(Buffer *buffer);
void * buffer_append_space(Buffer *buffer, uint32_t len);
int buffer_check_alloc(Buffer *buffer, uint32_t len);
uint32_t buffer_len(Buffer *buffer);
int buffer_get_ret(Buffer *buffer, void *buf, uint32_t len);
void buffer_get(Buffer *buffer, void *buf, uint32_t len);
int buffer_consume_ret(Buffer *buffer, uint32_t bytes);
void buffer_consume(Buffer *buffer, uint32_t bytes);
int buffer_consume_end_ret(Buffer *buffer, uint32_t bytes);
void buffer_consume_end(Buffer *buffer, uint32_t bytes);
void * buffer_ptr(Buffer *buffer);
#ifdef AUDIO_SCAN_DEBUG
void buffer_dump(Buffer *buffer, uint32_t len);
#endif
int buffer_get_char_ret(char *ret, Buffer *buffer);
int buffer_get_char(Buffer *buffer);
uint32_t get_u32le(const void *vp);
int buffer_get_int_le_ret(uint32_t *ret, Buffer *buffer);
uint32_t buffer_get_int_le(Buffer *buffer);
uint32_t get_u32(const void *vp);
int buffer_get_int_ret(uint32_t *ret, Buffer *buffer);
uint32_t buffer_get_int(Buffer *buffer);
uint32_t get_u24(const void *vp);
int buffer_get_int24_ret(uint32_t *ret, Buffer *buffer);
uint32_t buffer_get_int24(Buffer *buffer);
uint32_t get_u24le(const void *vp);
int buffer_get_int24_le_ret(uint32_t *ret, Buffer *buffer);
uint32_t buffer_get_int24_le(Buffer *buffer);
uint64_t get_u64le(const void *vp);
int buffer_get_int64_le_ret(uint64_t *ret, Buffer *buffer);
uint64_t buffer_get_int64_le(Buffer *buffer);
uint64_t get_u64(const void *vp);
int buffer_get_int64_ret(uint64_t *ret, Buffer *buffer);
uint64_t buffer_get_int64(Buffer *buffer);
uint16_t get_u16le(const void *vp);
int buffer_get_short_le_ret(uint16_t *ret, Buffer *buffer);
uint16_t buffer_get_short_le(Buffer *buffer);
uint16_t get_u16(const void *vp);
int buffer_get_short_ret(uint16_t *ret, Buffer *buffer);
uint16_t buffer_get_short(Buffer *buffer);
void buffer_put_char(Buffer *buffer, int value);
uint32_t buffer_get_utf8(Buffer *buffer, Buffer *utf8, uint32_t len_hint);
uint32_t buffer_get_latin1_as_utf8(Buffer *buffer, Buffer *utf8, uint32_t len_hint);
uint32_t buffer_get_utf16_as_utf8(Buffer *buffer, Buffer *utf8, uint32_t len, uint8_t byteorder);
#ifdef HAS_GUID
void buffer_get_guid(Buffer *buffer, GUID *g);
#endif
int buffer_get_float32_le_ret(float *ret, Buffer *buffer);
float buffer_get_float32_le(Buffer *buffer);
float get_f32le(const void *vp);
int buffer_get_float32_ret(float *ret, Buffer *buffer);
float buffer_get_float32(Buffer *buffer);
float get_f32(const void *vp);
double buffer_get_ieee_float(Buffer *buffer);
void put_u16(void *vp, uint16_t v);
void put_u32(void *vp, uint32_t v);
uint32_t buffer_get_bits(Buffer *buffer, uint32_t bits);
uint32_t buffer_get_syncsafe(Buffer *buffer, uint8_t bytes);

#endif