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bitmap.c
86 lines (77 loc) · 1.39 KB
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bitmap.c
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#include <bitmap.h>
boolean test_bit(bitmap_type *bitmap, u32int bit)
{
return (boolean) ((bitmap->addr[bit / 8] & (0x1 << (bit % 8))) != 0);
}
void set_bit(bitmap_type *bitmap, u32int bit)
{
bitmap->addr[bit / 8] |= (0x1 << (bit % 8));
}
void clear_bit(bitmap_type *bitmap, u32int bit)
{
bitmap->addr[bit / 8] &= ~(0x1 << (bit % 8));
}
u32int find_first_set_bit(bitmap_type *bitmap)
{
for (u32int i = 0; i < bitmap->bytes; i++)
{
if (bitmap->addr[i] != 0x0)
{
for (u8int j = 0; j < 8; j++)
{
if ((bitmap->addr[i] & (0x1 << j)))
{
return ((i * 8) + j);
}
}
}
}
return 0;
}
u32int find_first_clear_bit(bitmap_type *bitmap)
{
for (u32int i = 0; i < bitmap->bytes; i++)
{
if (bitmap->addr[i] != 0xFF)
{
for (u8int j = 0; j < 8; j++)
{
if (!(bitmap->addr[i] & (0x1 << j)))
{
return ((i * 8) + j);
}
}
}
}
return 0;
}
void clear_all_bits(bitmap_type *bitmap)
{
memset((u8int *) bitmap->addr, 0x0, bitmap->bytes);
}
void set_all_bits(bitmap_type *bitmap)
{
memset((u8int *) bitmap->addr, 0xFF, bitmap->bytes);
}
boolean any_bit_clear(bitmap_type *bitmap)
{
for (u32int i = 0; i < bitmap->bytes; i++)
{
if (bitmap->addr[i] != 0xFF)
{
return TRUE;
}
}
return FALSE;
}
boolean any_bit_set(bitmap_type *bitmap)
{
for (u32int i = 0; i < bitmap->bytes; i++)
{
if (bitmap->addr[i] != 0x0)
{
return TRUE;
}
}
return FALSE;
}