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[JFFS2] Clean up fs/jffs2/compr_rubin.c
Triggered by a smaller cleanup from Jianjun Kong <jianjun@zeuux.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse
parent
26cdb67c74
commit
0bc4382ae9
1 changed files with 64 additions and 56 deletions
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@ -22,9 +22,7 @@
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#define BIT_DIVIDER_MIPS 1043
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static int bits_mips[8] = { 277,249,290,267,229,341,212,241}; /* mips32 */
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#include <linux/errno.h>
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static int bits_mips[8] = { 277, 249, 290, 267, 229, 341, 212, 241};
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struct pushpull {
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unsigned char *buf;
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@ -43,7 +41,9 @@ struct rubin_state {
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int bits[8];
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};
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static inline void init_pushpull(struct pushpull *pp, char *buf, unsigned buflen, unsigned ofs, unsigned reserve)
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static inline void init_pushpull(struct pushpull *pp, char *buf,
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unsigned buflen, unsigned ofs,
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unsigned reserve)
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{
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pp->buf = buf;
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pp->buflen = buflen;
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@ -53,16 +53,14 @@ static inline void init_pushpull(struct pushpull *pp, char *buf, unsigned buflen
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static inline int pushbit(struct pushpull *pp, int bit, int use_reserved)
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{
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if (pp->ofs >= pp->buflen - (use_reserved?0:pp->reserve)) {
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if (pp->ofs >= pp->buflen - (use_reserved?0:pp->reserve))
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return -ENOSPC;
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}
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if (bit) {
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if (bit)
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pp->buf[pp->ofs >> 3] |= (1<<(7-(pp->ofs & 7)));
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}
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else {
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else
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pp->buf[pp->ofs >> 3] &= ~(1<<(7-(pp->ofs & 7)));
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}
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pp->ofs++;
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return 0;
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@ -97,6 +95,7 @@ static void init_rubin(struct rubin_state *rs, int div, int *bits)
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rs->p = (long) (2 * UPPER_BIT_RUBIN);
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rs->bit_number = (long) 0;
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rs->bit_divider = div;
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for (c=0; c<8; c++)
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rs->bits[c] = bits[c];
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}
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@ -108,7 +107,8 @@ static int encode(struct rubin_state *rs, long A, long B, int symbol)
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long i0, i1;
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int ret;
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while ((rs->q >= UPPER_BIT_RUBIN) || ((rs->p + rs->q) <= UPPER_BIT_RUBIN)) {
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while ((rs->q >= UPPER_BIT_RUBIN) ||
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((rs->p + rs->q) <= UPPER_BIT_RUBIN)) {
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rs->bit_number++;
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ret = pushbit(&rs->pp, (rs->q & UPPER_BIT_RUBIN) ? 1 : 0, 0);
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@ -119,12 +119,12 @@ static int encode(struct rubin_state *rs, long A, long B, int symbol)
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rs->p <<= 1;
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}
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i0 = A * rs->p / (A + B);
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if (i0 <= 0) {
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if (i0 <= 0)
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i0 = 1;
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}
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if (i0 >= rs->p) {
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if (i0 >= rs->p)
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i0 = rs->p - 1;
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}
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i1 = rs->p - i0;
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if (symbol == 0)
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@ -157,11 +157,13 @@ static void init_decode(struct rubin_state *rs, int div, int *bits)
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/* behalve lower */
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rs->rec_q = 0;
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for (rs->bit_number = 0; rs->bit_number++ < RUBIN_REG_SIZE; rs->rec_q = rs->rec_q * 2 + (long) (pullbit(&rs->pp)))
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for (rs->bit_number = 0; rs->bit_number++ < RUBIN_REG_SIZE;
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rs->rec_q = rs->rec_q * 2 + (long) (pullbit(&rs->pp)))
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;
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}
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static void __do_decode(struct rubin_state *rs, unsigned long p, unsigned long q)
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static void __do_decode(struct rubin_state *rs, unsigned long p,
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unsigned long q)
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{
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register unsigned long lower_bits_rubin = LOWER_BITS_RUBIN;
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unsigned long rec_q;
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@ -207,12 +209,11 @@ static int decode(struct rubin_state *rs, long A, long B)
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__do_decode(rs, p, q);
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i0 = A * rs->p / (A + B);
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if (i0 <= 0) {
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if (i0 <= 0)
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i0 = 1;
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}
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if (i0 >= rs->p) {
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if (i0 >= rs->p)
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i0 = rs->p - 1;
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}
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threshold = rs->q + i0;
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symbol = rs->rec_q >= threshold;
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@ -235,13 +236,14 @@ static int out_byte(struct rubin_state *rs, unsigned char byte)
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rs_copy = *rs;
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for (i=0; i<8; i++) {
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ret = encode(rs, rs->bit_divider-rs->bits[i],rs->bits[i],byte&1);
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ret = encode(rs, rs->bit_divider-rs->bits[i],
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rs->bits[i], byte & 1);
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if (ret) {
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/* Failed. Restore old state */
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*rs = rs_copy;
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return ret;
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}
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byte=byte>>1;
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byte >>= 1 ;
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}
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return 0;
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}
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@ -251,7 +253,8 @@ static int in_byte(struct rubin_state *rs)
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int i, result = 0, bit_divider = rs->bit_divider;
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for (i = 0; i < 8; i++)
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result |= decode(rs, bit_divider - rs->bits[i], rs->bits[i]) << i;
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result |= decode(rs, bit_divider - rs->bits[i],
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rs->bits[i]) << i;
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return result;
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}
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@ -259,7 +262,8 @@ static int in_byte(struct rubin_state *rs)
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static int rubin_do_compress(int bit_divider, int *bits, unsigned char *data_in,
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unsigned char *cpage_out, uint32_t *sourcelen, uint32_t *dstlen)
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unsigned char *cpage_out, uint32_t *sourcelen,
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uint32_t *dstlen)
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{
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int outpos = 0;
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int pos=0;
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@ -295,7 +299,8 @@ static int rubin_do_compress(int bit_divider, int *bits, unsigned char *data_in,
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int jffs2_rubinmips_compress(unsigned char *data_in, unsigned char *cpage_out,
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uint32_t *sourcelen, uint32_t *dstlen, void *model)
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{
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return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
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return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in,
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cpage_out, sourcelen, dstlen);
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}
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#endif
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static int jffs2_dynrubin_compress(unsigned char *data_in,
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@ -316,9 +321,8 @@ static int jffs2_dynrubin_compress(unsigned char *data_in,
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return -1;
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memset(histo, 0, 256);
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for (i=0; i<mysrclen; i++) {
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for (i=0; i<mysrclen; i++)
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histo[data_in[i]]++;
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}
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memset(bits, 0, sizeof(int)*8);
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for (i=0; i<256; i++) {
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if (i&128)
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@ -346,7 +350,8 @@ static int jffs2_dynrubin_compress(unsigned char *data_in,
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cpage_out[i] = bits[i];
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}
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ret = rubin_do_compress(256, bits, data_in, cpage_out+8, &mysrclen, &mydstlen);
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ret = rubin_do_compress(256, bits, data_in, cpage_out+8, &mysrclen,
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&mydstlen);
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if (ret)
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return ret;
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@ -363,8 +368,10 @@ static int jffs2_dynrubin_compress(unsigned char *data_in,
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return 0;
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}
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static void rubin_do_decompress(int bit_divider, int *bits, unsigned char *cdata_in,
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unsigned char *page_out, uint32_t srclen, uint32_t destlen)
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static void rubin_do_decompress(int bit_divider, int *bits,
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unsigned char *cdata_in,
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unsigned char *page_out, uint32_t srclen,
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uint32_t destlen)
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{
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int outpos = 0;
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struct rubin_state rs;
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@ -372,10 +379,9 @@ static void rubin_do_decompress(int bit_divider, int *bits, unsigned char *cdata
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init_pushpull(&rs.pp, cdata_in, srclen, 0, 0);
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init_decode(&rs, bit_divider, bits);
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while (outpos < destlen) {
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while (outpos < destlen)
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page_out[outpos++] = in_byte(&rs);
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}
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}
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static int jffs2_rubinmips_decompress(unsigned char *data_in,
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@ -383,7 +389,8 @@ static int jffs2_rubinmips_decompress(unsigned char *data_in,
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uint32_t sourcelen, uint32_t dstlen,
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void *model)
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{
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rubin_do_decompress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
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rubin_do_decompress(BIT_DIVIDER_MIPS, bits_mips, data_in,
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cpage_out, sourcelen, dstlen);
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return 0;
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}
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@ -398,7 +405,8 @@ static int jffs2_dynrubin_decompress(unsigned char *data_in,
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for (c=0; c<8; c++)
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bits[c] = data_in[c];
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rubin_do_decompress(256, bits, data_in+8, cpage_out, sourcelen-8, dstlen);
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rubin_do_decompress(256, bits, data_in+8, cpage_out, sourcelen-8,
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dstlen);
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return 0;
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}
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