huffman.c File Reference

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Functions
static int	pgetc ()
int	buf_getb ()
int	buf_getv (int n)
int	huff_make_dhuff_tb (int *p_xhtbl_bits, int p_dhtbl_ml, int *p_dhtbl_maxcode, int *p_dhtbl_mincode, int *p_dhtbl_valptr)
int	DecodeHuffman (int *Xhuff_huffval, int Dhuff_ml, int *Dhuff_maxcode, int *Dhuff_mincode, int *Dhuff_valptr)
void	DecodeHuffMCU (int *out_buf, int num_cmp)

Variables
static const int	extend_mask [20]
const int	bit_set_mask [32]
const int	lmask [32]
static unsigned int	current_read_byte
static int	read_position = -1

Function Documentation

buf_getb()

int buf_getb

(

)

Definition at line 116 of file huffman.c.

References bit_set_mask, current_read_byte, pgetc(), and read_position.

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buf_getv()

int buf_getv

(

int

n

)

Definition at line 137 of file huffman.c.

References current_read_byte, lmask, pgetc(), and read_position.

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DecodeHuffman()

int DecodeHuffman	(	int *	Xhuff_huffval,
		int	Dhuff_ml,
		int *	Dhuff_maxcode,
		int *	Dhuff_mincode,
		int *	Dhuff_valptr
	)

Definition at line 251 of file huffman.c.

References buf_getb(), EXIT, and main_result.

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DecodeHuffMCU()

void DecodeHuffMCU	(	int *	out_buf,
		int	num_cmp
	)

Definition at line 281 of file huffman.c.

References bit_set_mask, buf_getv(), DCTSIZE2, DecodeHuffman(), extend_mask, k, p_jinfo_ac_dhuff_tbl_maxcode, p_jinfo_ac_dhuff_tbl_mincode, p_jinfo_ac_dhuff_tbl_ml, p_jinfo_ac_dhuff_tbl_valptr, p_jinfo_ac_xhuff_tbl_huffval, p_jinfo_comps_info_dc_tbl_no, p_jinfo_dc_dhuff_tbl_maxcode, p_jinfo_dc_dhuff_tbl_mincode, p_jinfo_dc_dhuff_tbl_ml, p_jinfo_dc_dhuff_tbl_valptr, and p_jinfo_dc_xhuff_tbl_huffval.

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huff_make_dhuff_tb()

int huff_make_dhuff_tb	(	int *	p_xhtbl_bits,
		int	p_dhtbl_ml,
		int *	p_dhtbl_maxcode,
		int *	p_dhtbl_mincode,
		int *	p_dhtbl_valptr
	)

Definition at line 179 of file huffman.c.

pgetc()

static int pgetc ( )

static

Definition at line 93 of file huffman.c.

References CurHuffReadBuf, and MARKER_MARKER.

Referenced by buf_getb(), and buf_getv().

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Variable Documentation

bit_set_mask

const int bit_set_mask[32]

Initial value:

= {     
  0x00000001, 0x00000002, 0x00000004, 0x00000008,
  0x00000010, 0x00000020, 0x00000040, 0x00000080,
  0x00000100, 0x00000200, 0x00000400, 0x00000800,
  0x00001000, 0x00002000, 0x00004000, 0x00008000,
  0x00010000, 0x00020000, 0x00040000, 0x00080000,
  0x00100000, 0x00200000, 0x00400000, 0x00800000,
  0x01000000, 0x02000000, 0x04000000, 0x08000000,
  0x10000000, 0x20000000, 0x40000000, 0x80000000
}

Definition at line 63 of file huffman.c.

current_read_byte

unsigned int current_read_byte

static

Definition at line 85 of file huffman.c.

Referenced by buf_getb(), and buf_getv().

extend_mask

const int extend_mask[20]

static

Initial value:

= {
  0xFFFFFFFE, 0xFFFFFFFC, 0xFFFFFFF8, 0xFFFFFFF0, 0xFFFFFFE0, 0xFFFFFFC0,
  0xFFFFFF80, 0xFFFFFF00, 0xFFFFFE00, 0xFFFFFC00, 0xFFFFF800, 0xFFFFF000,
  0xFFFFE000, 0xFFFFC000, 0xFFFF8000, 0xFFFF0000, 0xFFFE0000, 0xFFFC0000,
  0xFFF80000, 0xFFF00000
}

Definition at line 54 of file huffman.c.

Referenced by DecodeHuffMCU().

lmask

const int lmask[32]

Initial value:

= {             
  0x00000001, 0x00000003, 0x00000007, 0x0000000f,
  0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff,
  0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff,
  0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff,
  0x0001ffff, 0x0003ffff, 0x0007ffff, 0x000fffff,
  0x001fffff, 0x003fffff, 0x007fffff, 0x00ffffff,
  0x01ffffff, 0x03ffffff, 0x07ffffff, 0x0fffffff,
  0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff
}

Definition at line 74 of file huffman.c.

read_position

int read_position = -1

static

Definition at line 86 of file huffman.c.

Referenced by buf_getb(), and buf_getv().