iPXE
Functions
bitmap.c File Reference

Bitmaps for multicast downloads. More...

#include <errno.h>
#include <ipxe/bitmap.h>

Go to the source code of this file.

Functions

 FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
 
int bitmap_resize (struct bitmap *bitmap, unsigned int new_length)
 Resize bitmap. More...
 
int bitmap_test (struct bitmap *bitmap, unsigned int bit)
 Test bit in bitmap. More...
 
void bitmap_set (struct bitmap *bitmap, unsigned int bit)
 Set bit in bitmap. More...
 

Detailed Description

Bitmaps for multicast downloads.

Definition in file bitmap.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL  )

◆ bitmap_resize()

int bitmap_resize ( struct bitmap bitmap,
unsigned int  new_length 
)

Resize bitmap.

Parameters
bitmapBitmap
new_lengthNew length of bitmap, in bits
Return values
rcReturn status code

Definition at line 42 of file bitmap.c.

42  {
43  unsigned int old_num_blocks;
44  unsigned int new_num_blocks;
45  size_t new_size;
46  bitmap_block_t *new_blocks;
47 
48  old_num_blocks = BITMAP_INDEX ( bitmap->length + BITMAP_BLKSIZE - 1 );
49  new_num_blocks = BITMAP_INDEX ( new_length + BITMAP_BLKSIZE - 1 );
50 
51  if ( old_num_blocks != new_num_blocks ) {
52  new_size = ( new_num_blocks * sizeof ( bitmap->blocks[0] ) );
53  new_blocks = realloc ( bitmap->blocks, new_size );
54  if ( ! new_blocks ) {
55  DBGC ( bitmap, "Bitmap %p could not resize to %d "
56  "bits\n", bitmap, new_length );
57  return -ENOMEM;
58  }
59  bitmap->blocks = new_blocks;
60  }
61  bitmap->length = new_length;
62 
63  while ( old_num_blocks < new_num_blocks ) {
64  bitmap->blocks[old_num_blocks++] = 0;
65  }
66 
67  DBGC ( bitmap, "Bitmap %p resized to %d bits\n", bitmap, new_length );
68  return 0;
69 }
#define DBGC(...)
Definition: compiler.h:505
#define BITMAP_BLKSIZE
Size of a block of bits (in bits)
Definition: bitmap.h:20
unsigned int length
Length of the bitmap, in bits.
Definition: bitmap.h:43
unsigned long bitmap_block_t
A single block of bits within a bitmap.
Definition: bitmap.h:17
bitmap_block_t * blocks
Bitmap data.
Definition: bitmap.h:41
#define BITMAP_INDEX(bit)
Block index within bitmap.
Definition: bitmap.h:28
#define ENOMEM
Not enough space.
Definition: errno.h:534
A bitmap.
Definition: bitmap.h:39
void * realloc(void *old_ptr, size_t new_size)
Reallocate memory.
Definition: malloc.c:521

References BITMAP_BLKSIZE, BITMAP_INDEX, bitmap::blocks, DBGC, ENOMEM, bitmap::length, and realloc().

Referenced by slam_open(), slam_pull_header(), and tftp_presize().

◆ bitmap_test()

int bitmap_test ( struct bitmap bitmap,
unsigned int  bit 
)

Test bit in bitmap.

Parameters
bitmapBitmap
bitBit index
Return values
is_setBit is set

Definition at line 78 of file bitmap.c.

78  {
79  unsigned int index = BITMAP_INDEX ( bit );
80  bitmap_block_t mask = BITMAP_MASK ( bit );
81 
82  if ( bit >= bitmap->length )
83  return 0;
84  return ( ( bitmap->blocks[index] & mask ) != 0 );
85 }
static unsigned int unsigned int bit
Definition: bigint.h:205
unsigned int length
Length of the bitmap, in bits.
Definition: bitmap.h:43
unsigned long bitmap_block_t
A single block of bits within a bitmap.
Definition: bitmap.h:17
bitmap_block_t * blocks
Bitmap data.
Definition: bitmap.h:41
#define BITMAP_INDEX(bit)
Block index within bitmap.
Definition: bitmap.h:28
A bitmap.
Definition: bitmap.h:39
#define BITMAP_MASK(bit)
Block mask within bitmap.
Definition: bitmap.h:36
uint64_t index
Index of the first segment within the content.
Definition: pccrc.h:21

References bit, BITMAP_INDEX, BITMAP_MASK, bitmap::blocks, index, and bitmap::length.

Referenced by bitmap_set(), slam_mc_socket_deliver(), and slam_tx_nack().

◆ bitmap_set()

void bitmap_set ( struct bitmap bitmap,
unsigned int  bit 
)

Set bit in bitmap.

Parameters
bitmapBitmap
bitBit index

Definition at line 93 of file bitmap.c.

93  {
94  unsigned int index = BITMAP_INDEX ( bit );
95  bitmap_block_t mask = BITMAP_MASK ( bit );
96 
97  DBGC ( bitmap, "Bitmap %p setting bit %d\n", bitmap, bit );
98 
99  /* Update bitmap */
100  bitmap->blocks[index] |= mask;
101 
102  /* Update first gap counter */
103  while ( bitmap_test ( bitmap, bitmap->first_gap ) ) {
104  bitmap->first_gap++;
105  }
106 }
static unsigned int unsigned int bit
Definition: bigint.h:205
#define DBGC(...)
Definition: compiler.h:505
unsigned long bitmap_block_t
A single block of bits within a bitmap.
Definition: bitmap.h:17
bitmap_block_t * blocks
Bitmap data.
Definition: bitmap.h:41
int bitmap_test(struct bitmap *bitmap, unsigned int bit)
Test bit in bitmap.
Definition: bitmap.c:78
#define BITMAP_INDEX(bit)
Block index within bitmap.
Definition: bitmap.h:28
A bitmap.
Definition: bitmap.h:39
unsigned int first_gap
Index of first gap in the bitmap.
Definition: bitmap.h:45
#define BITMAP_MASK(bit)
Block mask within bitmap.
Definition: bitmap.h:36
uint64_t index
Index of the first segment within the content.
Definition: pccrc.h:21

References bit, BITMAP_INDEX, BITMAP_MASK, bitmap_test(), bitmap::blocks, DBGC, bitmap::first_gap, and index.

Referenced by slam_mc_socket_deliver(), and tftp_rx_data().