+++ /dev/null
-////////////////////////////////////////////////////////////////////////////
-// **** WAVPACK **** //
-// Hybrid Lossless Wavefile Compressor //
-// Copyright (c) 1998 - 2005 Conifer Software. //
-// All Rights Reserved. //
-// Distributed under the BSD Software License (see license.txt) //
-////////////////////////////////////////////////////////////////////////////
-
-// bits.c
-
-// This module provides utilities to support the BitStream structure which is
-// used to read and write all WavPack audio data streams. It also contains a
-// wrapper for the stream I/O functions and a set of functions dealing with
-// endian-ness, both for enhancing portability. Finally, a debug wrapper for
-// the malloc() system is provided.
-
-#include "wavpack.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <sys/stat.h>
-
-#if defined(WIN32)
-#include <io.h>
-#else
-#include <unistd.h>
-#endif
-
-////////////////////////// Bitstream functions ////////////////////////////////
-
-#if defined(UNPACK) || defined(INFO_ONLY)
-
-// Open the specified BitStream and associate with the specified buffer.
-
-static void bs_read (Bitstream *bs);
-
-void bs_open_read (Bitstream *bs, uchar *buffer_start, uchar *buffer_end)
-{
- bs->error = bs->sr = bs->bc = 0;
- bs->ptr = (bs->buf = buffer_start) - 1;
- bs->end = buffer_end;
- bs->wrap = bs_read;
-}
-
-// This function is only called from the getbit() and getbits() macros when
-// the BitStream has been exhausted and more data is required. Sinve these
-// bistreams no longer access files, this function simple sets an error and
-// resets the buffer.
-
-static void bs_read (Bitstream *bs)
-{
- bs->ptr = bs->buf - 1;
- bs->error = 1;
-}
-
-// This function is called to close the bitstream. It returns the number of
-// full bytes actually read as bits.
-
-uint32_t bs_close_read (Bitstream *bs)
-{
- uint32_t bytes_read;
-
- if (bs->bc < 8)
- bs->ptr++;
-
- if ((bs->buf - bs->ptr) & 1)
- bs->ptr++;
-
- bytes_read = bs->ptr - bs->buf;
- CLEAR (*bs);
- return bytes_read;
-}
-
-#endif
-
-#ifdef PACK
-
-// Open the specified BitStream using the specified buffer pointers. It is
-// assumed that enough buffer space has been allocated for all data that will
-// be written, otherwise an error will be generated.
-
-static void bs_write (Bitstream *bs);
-
-void bs_open_write (Bitstream *bs, uchar *buffer_start, uchar *buffer_end)
-{
- bs->error = bs->sr = bs->bc = 0;
- bs->ptr = bs->buf = buffer_start;
- bs->end = buffer_end;
- bs->wrap = bs_write;
-}
-
-// This function is only called from the putbit() and putbits() macros when
-// the buffer is full, which is now flagged as an error.
-
-static void bs_write (Bitstream *bs)
-{
- bs->ptr = bs->buf;
- bs->error = 1;
-}
-
-// This function forces a flushing write of the specified BitStream, and
-// returns the total number of bytes written into the buffer.
-
-uint32_t bs_close_write (Bitstream *bs)
-{
- uint32_t bytes_written;
-
- if (bs->error)
- return (uint32_t) -1;
-
- while (bs->bc || ((bs->ptr - bs->buf) & 1)) putbit_1 (bs);
- bytes_written = bs->ptr - bs->buf;
- CLEAR (*bs);
- return bytes_written;
-}
-
-#endif
-
-/////////////////////// Endian Correction Routines ////////////////////////////
-
-void little_endian_to_native (void *data, char *format)
-{
- uchar *cp = (uchar *) data;
- int32_t temp;
-
- while (*format) {
- switch (*format) {
- case 'L':
- temp = cp [0] + ((int32_t) cp [1] << 8) + ((int32_t) cp [2] << 16) + ((int32_t) cp [3] << 24);
- * (int32_t *) cp = temp;
- cp += 4;
- break;
-
- case 'S':
- temp = cp [0] + (cp [1] << 8);
- * (short *) cp = (short) temp;
- cp += 2;
- break;
-
- default:
- if (isdigit (*format))
- cp += *format - '0';
-
- break;
- }
-
- format++;
- }
-}
-
-void native_to_little_endian (void *data, char *format)
-{
- uchar *cp = (uchar *) data;
- int32_t temp;
-
- while (*format) {
- switch (*format) {
- case 'L':
- temp = * (int32_t *) cp;
- *cp++ = (uchar) temp;
- *cp++ = (uchar) (temp >> 8);
- *cp++ = (uchar) (temp >> 16);
- *cp++ = (uchar) (temp >> 24);
- break;
-
- case 'S':
- temp = * (short *) cp;
- *cp++ = (uchar) temp;
- *cp++ = (uchar) (temp >> 8);
- break;
-
- default:
- if (isdigit (*format))
- cp += *format - '0';
-
- break;
- }
-
- format++;
- }
-}
-
-////////////////////////// Debug Wrapper for Malloc ///////////////////////////
-
-#ifdef DEBUG_ALLOC
-
-void *vptrs [512];
-
-static void *add_ptr (void *ptr)
-{
- int i;
-
- for (i = 0; i < 512; ++i)
- if (!vptrs [i]) {
- vptrs [i] = ptr;
- break;
- }
-
- if (i == 512)
- error_line ("too many mallocs!");
-
- return ptr;
-}
-
-static void *del_ptr (void *ptr)
-{
- int i;
-
- for (i = 0; i < 512; ++i)
- if (vptrs [i] == ptr) {
- vptrs [i] = NULL;
- break;
- }
-
- if (i == 512)
- error_line ("free invalid ptr!");
-
- return ptr;
-}
-
-void *malloc_db (uint32_t size)
-{
- if (size)
- return add_ptr (malloc (size));
- else
- return NULL;
-}
-
-void free_db (void *ptr)
-{
- if (ptr)
- free (del_ptr (ptr));
-}
-
-void *realloc_db (void *ptr, uint32_t size)
-{
- if (ptr && size)
- return add_ptr (realloc (del_ptr (ptr), size));
- else if (size)
- return malloc_db (size);
- else
- free_db (ptr);
-
- return NULL;
-}
-
-int32_t dump_alloc (void)
-{
- int i, j;
-
- for (j = i = 0; i < 512; ++i)
- if (vptrs [i])
- j++;
-
- return j;
-}
-
-#endif
projects / vuplus_xbmc / blobdiff