/* errno is not a global variable, because that would make using it non-reentrant. Instead, its address is returned by the function __errno. */ #if defined(SIMULATOR) && !defined(__MINGW32__) && !defined(__CYGWIN__) #include "/usr/include/errno.h" /* use the host system implementation */ #else /* use our own implementation */ #ifndef _SYS_ERRNO_H_ extern int errno; #define EPERM 1 /* Not super-user */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5 /* I/O error */ #define ENXIO 6 /* No such device or address */ #define E2BIG 7 /* Arg list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 /* No children */ #define EAGAIN 11 /* No more processes */ #define ENOMEM 12 /* Not enough core */ #define EACCES 13 /* Permission denied */ #define EFAULT 14 /* Bad address */ #define ENOTBLK 15 /* Block device required */ #define EBUSY 16 /* Mount device busy */ #define EEXIST 17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV 19 /* No such device */ #define ENOTDIR 20 /* Not a directory */ #define EISDIR 21 /* Is a directory */ #define EINVAL 22 /* Invalid argument */ #define ENFILE 23 /* Too many open files in system */ #define EMFILE 24 /* Too many open files */ #define ENOTTY 25 /* Not a typewriter */ #define ETXTBSY 26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC 28 /* No space left on device */ #define ESPIPE 29 /* Illegal seek */ #define EROFS 30 /* Read only file system */ #define EMLINK 31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math arg out of domain of func */ #define ERANGE 34 /* Math result not representable */ #define ENOMSG 35 /* No message of desired type */ #define EIDRM 36 /* Identifier removed */ #define ECHRNG 37 /* Channel number out of range */ #define EL2NSYNC 38 /* Level 2 not synchronized */ #define EL3HLT 39 /* Level 3 halted */ #define EL3RST 40 /* Level 3 reset */ #define ELNRNG 41 /* Link number out of range */ #define EUNATCH 42 /* Protocol driver not attached */ #define ENOCSI 43 /* No CSI structure available */ #define EL2HLT 44 /* Level 2 halted */ #define EDEADLK 45 /* Deadlock condition */ #define ENOLCK 46 /* No record locks available */ #define EBADE 50 /* Invalid exchange */ #define EBADR 51 /* Invalid request descriptor */ #define EXFULL 52 /* Exchange full */ #define ENOANO 53 /* No anode */ #define EBADRQC 54 /* Invalid request code */ #define EBADSLT 55 /* Invalid slot */ #define EDEADLOCK 56 /* File locking deadlock error */ #define EBFONT 57 /* Bad font file fmt */ #define ENOSTR 60 /* Device not a stream */ #define ENODATA 61 /* No data (for no delay io) */ #define ETIME 62 /* Timer expired */ #define ENOSR 63 /* Out of streams resources */ #define ENONET 64 /* Machine is not on the network */ #define ENOPKG 65 /* Package not installed */ #define EREMOTE 66 /* The object is remote */ #define ENOLINK 67 /* The link has been severed */ #define EADV 68 /* Advertise error */ #define ESRMNT 69 /* Srmount error */ #define ECOMM 70 /* Communication error on send */ #define EPROTO 71 /* Protocol error */ #define EMULTIHOP 74 /* Multihop attempted */ #define ELBIN 75 /* Inode is remote (not really error) */ #define EDOTDOT 76 /* Cross mount point (not really error) */ #define EBADMSG 77 /* Trying to read unreadable message */ #define ENOTUNIQ 80 /* Given log. name not unique */ #define EBADFD 81 /* f.d. invalid for this operation */ #define EREMCHG 82 /* Remote address changed */ #define ELIBACC 83 /* Can't access a needed shared lib */ #define ELIBBAD 84 /* Accessing a corrupted shared lib */ #define ELIBSCN 85 /* .lib section in a.out corrupted */ #define ELIBMAX 86 /* Attempting to link in too many libs */ #define ELIBEXEC 87 /* Attempting to exec a shared library */ #define ENOSYS 88 /* Function not implemented */ #define ENMFILE 89 /* No more files */ #define ENOTEMPTY 90 /* Directory not empty */ #define ENAMETOOLONG 91 /* File or path name too long */ #define ELOOP 92 /* Too many symbolic links */ #define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */ #define EPFNOSUPPORT 96 /* Protocol family not supported */ #define ECONNRESET 104 /* Connection reset by peer */ #define ENOBUFS 105 /* No buffer space available */ #define EAFNOSUPPORT 106 /* Address family not supported by protocol family */ #define EPROTOTYPE 107 /* Protocol wrong type for socket */ #define ENOTSOCK 108 /* Socket operation on non-socket */ #define ENOPROTOOPT 109 /* Protocol not available */ #define ESHUTDOWN 110 /* Can't send after socket shutdown */ #define ECONNREFUSED 111 /* Connection refused */ #define EADDRINUSE 112 /* Address already in use */ #define ECONNABORTED 113 /* Connection aborted */ #define ENETUNREACH 114 /* Network is unreachable */ #define ENETDOWN 115 /* Network interface is not configured */ #define ETIMEDOUT 116 /* Connection timed out */ #define EHOSTDOWN 117 /* Host is down */ #define EHOSTUNREACH 118 /* Host is unreachable */ #define EINPROGRESS 119 /* Connection already in progress */ #define EALREADY 120 /* Socket already connected */ #define EDESTADDRREQ 121 /* Destination address required */ #define EMSGSIZE 122 /* Message too long */ #define EPROTONOSUPPORT 123 /* Unknown protocol */ #define ESOCKTNOSUPPORT 124 /* Socket type not supported */ #define EADDRNOTAVAIL 125 /* Address not available */ #define ENETRESET 126 #define EISCONN 127 /* Socket is already connected */ #define ENOTCONN 128 /* Socket is not connected */ #define ETOOMANYREFS 129 #define EPROCLIM 130 #define EUSERS 131 #define EDQUOT 132 #define ESTALE 133 #define ENOTSUP 134 /* Not supported */ #define ENOMEDIUM 135 /* No medium (in tape drive) */ #define ENOSHARE 136 /* No such host or network path */ #define ECASECLASH 137 /* Filename exists with different case */ /* From cygwin32. */ #define EWOULDBLOCK EAGAIN /* Operation would block */ #define __ELASTERROR 2000 /* Users can add values starting here */ #endif /* _SYS_ERRNO_H */ #endif /* !SIMULATOR */ /a> 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id$
**/

#ifndef __BITS_H__
#define __BITS_H__

#ifdef __cplusplus
extern "C" {
#endif

#include "analysis.h"
#ifdef ANALYSIS
#include <stdio.h>
#endif

#define BYTE_NUMBIT 8
#define bit2byte(a) ((a+7)/BYTE_NUMBIT)

typedef struct _bitfile
{
    /* bit input */
    uint32_t bufa;
    uint32_t bufb;
    uint32_t bits_left;
    uint32_t buffer_size; /* size of the buffer in bytes */
    uint32_t bytes_used;
    uint8_t no_more_reading;
    uint8_t error;
    uint32_t *tail;
    uint32_t *start;
    void *buffer;
} bitfile;


#if defined (_WIN32) && !defined(_WIN32_WCE) && !defined(__MINGW32__)
#define BSWAP(a) __asm mov eax,a __asm bswap eax __asm mov a, eax
#elif defined(LINUX) || defined(DJGPP) || defined(__MINGW32__)
#define BSWAP(a) __asm__ ( "bswapl %0\n" : "=r" (a) : "0" (a) )
#else
#define BSWAP(a) \
    ((a) = ( ((a)&0xff)<<24) | (((a)&0xff00)<<8) | (((a)>>8)&0xff00) | (((a)>>24)&0xff))
#endif

static uint32_t bitmask[] = {
    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
    /* added bitmask 32, correct?!?!?! */
    , 0xFFFFFFFF
};

void faad_initbits(bitfile *ld, const void *buffer, const uint32_t buffer_size);
void faad_endbits(bitfile *ld);
void faad_initbits_rev(bitfile *ld, void *buffer,
                       uint32_t bits_in_buffer);
uint8_t faad_byte_align(bitfile *ld);
uint32_t faad_get_processed_bits(bitfile *ld);
void faad_flushbits_ex(bitfile *ld, uint32_t bits);
void faad_rewindbits(bitfile *ld);
uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
                       DEBUGDEC);
#ifdef DRM
void *faad_origbitbuffer(bitfile *ld);
uint32_t faad_origbitbuffer_size(bitfile *ld);
#endif

/* circumvent memory alignment errors on ARM */
static INLINE uint32_t getdword(void *mem)
{
#ifdef ARM
    uint32_t tmp;
#ifndef ARCH_IS_BIG_ENDIAN
    ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[3];
    ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[2];
    ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[1];
    ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[0];
#else
    ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[0];
    ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[1];
    ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[2];
    ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[3];
#endif

    return tmp;
#else
    uint32_t tmp;
    tmp = *(uint32_t*)mem;
#ifndef ARCH_IS_BIG_ENDIAN
    BSWAP(tmp);
#endif
    return tmp;
#endif
}

static INLINE uint32_t faad_showbits(bitfile *ld, uint32_t bits)
{
    if (bits <= ld->bits_left)
    {
        return (ld->bufa >> (ld->bits_left - bits)) & bitmask[bits];
    }

    bits -= ld->bits_left;
    return ((ld->bufa & bitmask[ld->bits_left]) << bits) | (ld->bufb >> (32 - bits));
}

static INLINE void faad_flushbits(bitfile *ld, uint32_t bits)
{
    /* do nothing if error */
    if (ld->error != 0)
        return;

    if (bits < ld->bits_left)
    {
        ld->bits_left -= bits;
    } else {
        faad_flushbits_ex(ld, bits);
    }
}

/* return next n bits (right adjusted) */
static uint32_t faad_getbits(bitfile *ld, uint32_t n DEBUGDEC)
{
    uint32_t ret;

    if (ld->no_more_reading || n == 0)
        return 0;

    ret = faad_showbits(ld, n);
    faad_flushbits(ld, n);

#ifdef ANALYSIS
    if (print)
        fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
#endif

    return ret;
}

static INLINE uint8_t faad_get1bit(bitfile *ld DEBUGDEC)
{
    uint8_t r;

    if (ld->bits_left > 0)
    {
        ld->bits_left--;
        r = (uint8_t)((ld->bufa >> ld->bits_left) & 1);
        return r;
    }

    /* bits_left == 0 */
#if 0
    r = (uint8_t)(ld->bufb >> 31);
    faad_flushbits_ex(ld, 1);
#else
    r = (uint8_t)faad_getbits(ld, 1);
#endif
    return r;
}

/* reversed bitreading routines */
static INLINE uint32_t faad_showbits_rev(bitfile *ld, uint32_t bits)
{
    uint8_t i;
    uint32_t B = 0;

    if (bits <= ld->bits_left)
    {
        for (i = 0; i < bits; i++)
        {
            if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
                B |= (1 << (bits - i - 1));
        }
        return B;
    } else {
        for (i = 0; i < ld->bits_left; i++)
        {
            if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
                B |= (1 << (bits - i - 1));
        }
        for (i = 0; i < bits - ld->bits_left; i++)
        {
            if (ld->bufb & (1 << (i + (32-ld->bits_left))))
                B |= (1 << (bits - ld->bits_left - i - 1));
        }
        return B;
    }
}

static INLINE void faad_flushbits_rev(bitfile *ld, uint32_t bits)
{
    /* do nothing if error */
    if (ld->error != 0)
        return;

    if (bits < ld->bits_left)
    {
        ld->bits_left -= bits;
    } else {
        uint32_t tmp;

        ld->bufa = ld->bufb;
        tmp = getdword(ld->start);
        ld->bufb = tmp;
        ld->start--;
        ld->bits_left += (32 - bits);

        ld->bytes_used += 4;
        if (ld->bytes_used == ld->buffer_size)
            ld->no_more_reading = 1;
        if (ld->bytes_used > ld->buffer_size)
            ld->error = 1;
    }
}

static INLINE uint32_t faad_getbits_rev(bitfile *ld, uint32_t n
                                        DEBUGDEC)
{
    uint32_t ret;

    if (ld->no_more_reading)
        return 0;

    if (n == 0)
        return 0;

    ret = faad_showbits_rev(ld, n);
    faad_flushbits_rev(ld, n);

#ifdef ANALYSIS
    if (print)
        fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
#endif

    return ret;
}

#ifdef DRM
static uint8_t faad_check_CRC(bitfile *ld, uint16_t len)
{
    uint8_t CRC;
    uint16_t r=255;  /* Initialize to all ones */

    /* CRC polynome used x^8 + x^4 + x^3 + x^2 +1 */
#define GPOLY 0435

    faad_rewindbits(ld);

    CRC = (uint8_t) ~faad_getbits(ld, 8
        DEBUGVAR(1,999,"faad_check_CRC(): CRC"));          /* CRC is stored inverted */

    for (; len>0; len--)
    {
        r = ( (r << 1) ^ (( ( faad_get1bit(ld
            DEBUGVAR(1,998,""))  & 1) ^ ((r >> 7) & 1)) * GPOLY )) & 0xFF;
    }

    if (r != CRC)
    {
        return 8;
    } else {
        return 0;
    }
}

static uint8_t tabFlipbits[256] = {
    0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240,
    8,136,72,200,40,168,104,232,24,152,88,216,56,184,120,248,
    4,132,68,196,36,164,100,228,20,148,84,212,52,180,116,244,
    12,140,76,204,44,172,108,236,28,156,92,220,60,188,124,252,
    2,130,66,194,34,162,98,226,18,146,82,210,50,178,114,242,
    10,138,74,202,42,170,106,234,26,154,90,218,58,186,122,250,
    6,134,70,198,38,166,102,230,22,150,86,214,54,182,118,246,
    14,142,78,206,46,174,110,238,30,158,94,222,62,190,126,254,
    1,129,65,193,33,161,97,225,17,145,81,209,49,177,113,241,
    9,137,73,201,41,169,105,233,25,153,89,217,57,185,121,249,
    5,133,69,197,37,165,101,229,21,149,85,213,53,181,117,245,
    13,141,77,205,45,173,109,237,29,157,93,221,61,189,125,253,
    3,131,67,195,35,163,99,227,19,147,83,211,51,179,115,243,
    11,139,75,203,43,171,107,235,27,155,91,219,59,187,123,251,
    7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247,
    15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255
};
#endif

#ifdef ERROR_RESILIENCE

/* Modified bit reading functions for HCR */

typedef struct
{
    /* bit input */
    uint32_t bufa;
    uint32_t bufb;
    int8_t len;
} bits_t;


static INLINE uint32_t showbits_hcr(bits_t *ld, uint8_t bits)
{
    if (bits == 0) return 0;
    if (ld->len <= 32)
    {
        /* huffman_spectral_data_2 needs to read more than may be available, bits maybe
           > ld->len, deliver 0 than */
        if (ld->len >= bits)
            return ((ld->bufa >> (ld->len - bits)) & (0xFFFFFFFF >> (32 - bits)));
        else
            return ((ld->bufa << (bits - ld->len)) & (0xFFFFFFFF >> (32 - bits)));
    } else {
        if ((ld->len - bits) < 32)
        {
            return ( (ld->bufb & (0xFFFFFFFF >> (64 - ld->len))) << (bits - ld->len + 32)) |
                (ld->bufa >> (ld->len - bits));
        } else {
            return ((ld->bufb >> (ld->len - bits - 32)) & (0xFFFFFFFF >> (32 - bits)));
        }
    }
}

/* return 1 if position is outside of buffer, 0 otherwise */
static INLINE int8_t flushbits_hcr( bits_t *ld, uint8_t bits)
{
    ld->len -= bits;

    if (ld->len <0)
    {
        ld->len = 0;
        return 1;
    } else {
        return 0;
    }
}

static INLINE int8_t getbits_hcr(bits_t *ld, uint8_t n, uint32_t *result)
{
    *result = showbits_hcr(ld, n);
    return flushbits_hcr(ld, n);
}

static INLINE int8_t get1bit_hcr(bits_t *ld, uint8_t *result)
{
    uint32_t res;
    int8_t ret;

    ret = getbits_hcr(ld, 1, &res);
    *result = (int8_t)(res & 1);
    return ret;
}

#endif


#ifdef __cplusplus
}
#endif
#endif
generated by cgit v1.1 at 2026-05-09 10:51:33 +0000