diff options
Diffstat (limited to 'src/lib/nrv2b.c')
-rw-r--r-- | src/lib/nrv2b.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/src/lib/nrv2b.c b/src/lib/nrv2b.c deleted file mode 100644 index d84e99ec0b..0000000000 --- a/src/lib/nrv2b.c +++ /dev/null @@ -1,84 +0,0 @@ -// This GETBIT is supposed to work on little endian -// 32bit systems. The algorithm will definitely need -// some fixing on other systems, but it might not be -// a problem since the nrv2b binary behaves the same.. - -#ifndef ENDIAN -#define ENDIAN 0 -#endif -#ifndef BITSIZE -#define BITSIZE 32 -#endif - -#define GETBIT_8(bb, src, ilen) \ - (((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1) - -#define GETBIT_LE16(bb, src, ilen) \ - (bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1)) -#define GETBIT_LE32(bb, src, ilen) \ - (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ - bb=*(const uint32_t *)((src)+ilen),ilen+=4,(bb>>31)&1)) - -#if ENDIAN == 0 && BITSIZE == 8 -#define GETBIT(bb, src, ilen) GETBIT_8(bb, src, ilen) -#endif -#if ENDIAN == 0 && BITSIZE == 16 -#define GETBIT(bb, src, ilen) GETBIT_LE16(bb, src, ilen) -#endif -#if ENDIAN == 0 && BITSIZE == 32 -#define GETBIT(bb, src, ilen) GETBIT_LE32(bb, src, ilen) -#endif -static unsigned long unrv2b(uint8_t * src, uint8_t * dst, unsigned long *ilen_p) -{ - unsigned long ilen = 0, olen = 0, last_m_off = 1; - uint32_t bb = 0; - unsigned bc = 0; - const uint8_t *m_pos; - - // skip length - src += 4; - /* FIXME: check olen with the length stored in first 4 bytes */ - - for (;;) { - unsigned int m_off, m_len; - while (GETBIT(bb, src, ilen)) { - dst[olen++] = src[ilen++]; - } - - m_off = 1; - do { - m_off = m_off * 2 + GETBIT(bb, src, ilen); - } while (!GETBIT(bb, src, ilen)); - if (m_off == 2) { - m_off = last_m_off; - } else { - m_off = (m_off - 3) * 256 + src[ilen++]; - if (m_off == 0xffffffffU) - break; - last_m_off = ++m_off; - } - - m_len = GETBIT(bb, src, ilen); - m_len = m_len * 2 + GETBIT(bb, src, ilen); - if (m_len == 0) { - m_len++; - do { - m_len = m_len * 2 + GETBIT(bb, src, ilen); - } while (!GETBIT(bb, src, ilen)); - m_len += 2; - } - m_len += (m_off > 0xd00); - - m_pos = dst + olen - m_off; - dst[olen++] = *m_pos++; - do { - dst[olen++] = *m_pos++; - } while (--m_len > 0); - } - - *ilen_p = ilen; - - return olen; - -} - |