#ifndef VLC_BITS_H
#define VLC_BITS_H 1
+/**
+ * \file
+ * This file defines functions, structures for handling streams of bits in vlc
+ */
+
typedef struct bs_s
{
uint8_t *p_start;
uint8_t *p;
uint8_t *p_end;
- int i_left; /* i_count number of available bits */
+ ssize_t i_left; /* i_count number of available bits */
} bs_t;
-static inline void bs_init( bs_t *s, void *p_data, int i_data )
+static inline void bs_init( bs_t *s, const void *p_data, size_t i_data )
{
- s->p_start = p_data;
- s->p = p_data;
- s->p_end = s->p + i_data;
+ s->p_start = (void *)p_data;
+ s->p = s->p_start;
+ s->p_end = s->p_start + i_data;
s->i_left = 8;
}
-static inline int bs_pos( bs_t *s )
+
+static inline int bs_pos( const bs_t *s )
{
return( 8 * ( s->p - s->p_start ) + 8 - s->i_left );
}
-static inline int bs_eof( bs_t *s )
+
+static inline int bs_eof( const bs_t *s )
{
return( s->p >= s->p_end ? 1: 0 );
}
+
static inline uint32_t bs_read( bs_t *s, int i_count )
{
static const uint32_t i_mask[33] =
return bs_read( &s_tmp, i_count );
}
-static inline void bs_skip( bs_t *s, int i_count )
+static inline void bs_skip( bs_t *s, ssize_t i_count )
{
s->i_left -= i_count;
- while( s->i_left <= 0 )
+ if( s->i_left <= 0 )
{
- s->p++;
- s->i_left += 8;
+ const int i_bytes = ( -s->i_left + 8 ) / 8;
+
+ s->p += i_bytes;
+ s->i_left += 8 * i_bytes;
}
}
s->p++;
}
}
+
static inline void bs_align_0( bs_t *s )
{
if( s->i_left != 8 )
bs_write( s, s->i_left, 0 );
}
}
+
static inline void bs_align_1( bs_t *s )
{
while( s->i_left != 8 )