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Align to next byte

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This commit is contained in:
atxr 2024-02-21 16:11:01 +01:00
parent b0f5cd41f9
commit 9f8bcf7769
2 changed files with 11 additions and 2 deletions
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1
libmineziper/include/libmineziper_bitstream.h
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@ -17,6 +17,7 @@ unsigned int get_bits(bitstream *bs, unsigned int size);
void print_bits(int x, int size); void print_bits(int x, int size);
unsigned int reverse(unsigned int x, unsigned int numBits); unsigned int reverse(unsigned int x, unsigned int numBits);
bitstream init_bitstream(char *data, int size, int last_bit_offset); bitstream init_bitstream(char *data, int size, int last_bit_offset);
void align_to_next_byte(bitstream *bs);
static const unsigned char reverse8[256] = { static const unsigned char reverse8[256] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0,

12
libmineziper/src/libmineziper_bitstream.c
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@ -37,7 +37,6 @@ unsigned int get_bits(bitstream* bs, unsigned int bit_num)
unsigned int reverse(unsigned int x, unsigned int numBits) unsigned int reverse(unsigned int x, unsigned int numBits)
{ {
assert(x < (unsigned int) (1 << numBits)); assert(x < (unsigned int) (1 << numBits));
// fast lookup if it fits in a byte // fast lookup if it fits in a byte
@ -88,4 +87,13 @@ bitstream init_bitstream(char* data, int size, int last_bit_offset)
.last_bit_offset = last_bit_offset}; .last_bit_offset = last_bit_offset};
return bs; return bs;
} }
void align_to_next_byte(bitstream* bs)
{
if (bs->current_bit_offset)
{
bs->current_bit_offset = 0;
bs->current_data_offset++;
}
}