diff options
Diffstat (limited to 'src/libdraw/md-write.c')
| -rw-r--r-- | src/libdraw/md-write.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/src/libdraw/md-write.c b/src/libdraw/md-write.c deleted file mode 100644 index c03c58e8..00000000 --- a/src/libdraw/md-write.c +++ /dev/null @@ -1,183 +0,0 @@ -#include <u.h> -#include <libc.h> -#include <draw.h> -#include <memdraw.h> - -#define CHUNK 8000 - -#define HSHIFT 3 /* HSHIFT==5 runs slightly faster, but hash table is 64x bigger */ -#define NHASH (1<<(HSHIFT*NMATCH)) -#define HMASK (NHASH-1) -#define hupdate(h, c) ((((h)<<HSHIFT)^(c))&HMASK) -typedef struct Hlist Hlist; -struct Hlist{ - uchar *s; - Hlist *next, *prev; -}; - -int -writememimage(int fd, Memimage *i) -{ - uchar *outbuf, *outp, *eout; /* encoded data, pointer, end */ - uchar *loutp; /* start of encoded line */ - Hlist *hash; /* heads of hash chains of past strings */ - Hlist *chain, *hp; /* hash chain members, pointer */ - Hlist *cp; /* next Hlist to fall out of window */ - int h; /* hash value */ - uchar *line, *eline; /* input line, end pointer */ - uchar *data, *edata; /* input buffer, end pointer */ - u32int n; /* length of input buffer */ - u32int nb; /* # of bytes returned by unloadimage */ - int bpl; /* input line length */ - int offs, runlen; /* offset, length of consumed data */ - uchar dumpbuf[NDUMP]; /* dump accumulator */ - int ndump; /* length of dump accumulator */ - int miny, dy; /* y values while unloading input */ - int ncblock; /* size of compressed blocks */ - Rectangle r; - uchar *p, *q, *s, *es, *t; - char hdr[11+5*12+1]; - char cbuf[20]; - - r = i->r; - bpl = bytesperline(r, i->depth); - n = Dy(r)*bpl; - data = malloc(n); - ncblock = _compblocksize(r, i->depth); - outbuf = malloc(ncblock); - hash = malloc(NHASH*sizeof(Hlist)); - chain = malloc(NMEM*sizeof(Hlist)); - if(data == 0 || outbuf == 0 || hash == 0 || chain == 0){ - ErrOut: - free(data); - free(outbuf); - free(hash); - free(chain); - return -1; - } - for(miny = r.min.y; miny != r.max.y; miny += dy){ - dy = r.max.y-miny; - if(dy*bpl > CHUNK) - dy = CHUNK/bpl; - nb = unloadmemimage(i, Rect(r.min.x, miny, r.max.x, miny+dy), - data+(miny-r.min.y)*bpl, dy*bpl); - if(nb != dy*bpl) - goto ErrOut; - } - sprint(hdr, "compressed\n%11s %11d %11d %11d %11d ", - chantostr(cbuf, i->chan), r.min.x, r.min.y, r.max.x, r.max.y); - if(write(fd, hdr, 11+5*12) != 11+5*12) - goto ErrOut; - edata = data+n; - eout = outbuf+ncblock; - line = data; - r.max.y = r.min.y; - while(line != edata){ - memset(hash, 0, NHASH*sizeof(Hlist)); - memset(chain, 0, NMEM*sizeof(Hlist)); - cp = chain; - h = 0; - outp = outbuf; - for(n = 0; n != NMATCH; n++) - h = hupdate(h, line[n]); - loutp = outbuf; - while(line != edata){ - ndump = 0; - eline = line+bpl; - for(p = line; p != eline; ){ - if(eline-p < NRUN) - es = eline; - else - es = p+NRUN; - q = 0; - runlen = 0; - for(hp = hash[h].next; hp; hp = hp->next){ - s = p + runlen; - if(s >= es) - continue; - t = hp->s + runlen; - for(; s >= p; s--) - if(*s != *t--) - goto matchloop; - t += runlen+2; - s += runlen+2; - for(; s < es; s++) - if(*s != *t++) - break; - n = s-p; - if(n > runlen){ - runlen = n; - q = hp->s; - if(n == NRUN) - break; - } - matchloop: ; - } - if(runlen < NMATCH){ - if(ndump == NDUMP){ - if(eout-outp < ndump+1) - goto Bfull; - *outp++ = ndump-1+128; - memmove(outp, dumpbuf, ndump); - outp += ndump; - ndump = 0; - } - dumpbuf[ndump++] = *p; - runlen = 1; - } - else{ - if(ndump != 0){ - if(eout-outp < ndump+1) - goto Bfull; - *outp++ = ndump-1+128; - memmove(outp, dumpbuf, ndump); - outp += ndump; - ndump = 0; - } - offs = p-q-1; - if(eout-outp < 2) - goto Bfull; - *outp++ = ((runlen-NMATCH)<<2) + (offs>>8); - *outp++ = offs&255; - } - for(q = p+runlen; p != q; p++){ - if(cp->prev) - cp->prev->next = 0; - cp->next = hash[h].next; - cp->prev = &hash[h]; - if(cp->next) - cp->next->prev = cp; - cp->prev->next = cp; - cp->s = p; - if(++cp == &chain[NMEM]) - cp = chain; - if(edata-p > NMATCH) - h = hupdate(h, p[NMATCH]); - } - } - if(ndump != 0){ - if(eout-outp < ndump+1) - goto Bfull; - *outp++ = ndump-1+128; - memmove(outp, dumpbuf, ndump); - outp += ndump; - } - line = eline; - loutp = outp; - r.max.y++; - } - Bfull: - if(loutp == outbuf) - goto ErrOut; - n = loutp-outbuf; - sprint(hdr, "%11d %11ld ", r.max.y, n); - write(fd, hdr, 2*12); - write(fd, outbuf, n); - r.min.y = r.max.y; - } - free(data); - free(outbuf); - free(hash); - free(chain); - return 0; -} |