ref: 963cfc9a6f6e721f52aa949e6d1af0c3e8dc2ecc
dir: /sys/src/cmd/iconv.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> void usage(void) { fprint(2, "usage: iconv [-u] [-c chanstr] [file]\n"); exits("usage"); } void writeuncompressed(int fd, Memimage *m) { char chanstr[32]; int bpl, y, j; uchar *buf; if(chantostr(chanstr, m->chan) == nil) sysfatal("can't convert channel descriptor: %r"); fprint(fd, "%11s %11d %11d %11d %11d ", chanstr, m->r.min.x, m->r.min.y, m->r.max.x, m->r.max.y); bpl = bytesperline(m->r, m->depth); buf = malloc(bpl); if(buf == nil) sysfatal("malloc failed: %r"); for(y=m->r.min.y; y<m->r.max.y; y++){ j = unloadmemimage(m, Rect(m->r.min.x, y, m->r.max.x, y+1), buf, bpl); if(j != bpl) sysfatal("image unload failed: %r"); if(write(fd, buf, bpl) != bpl) sysfatal("write failed: %r"); } free(buf); } void main(int argc, char *argv[]) { char *tostr, *file; int fd, uncompressed; ulong tochan; Memimage *m, *n; tostr = nil; uncompressed = 0; ARGBEGIN{ case 'c': tostr = EARGF(usage()); break; case 'u': uncompressed = 1; break; default: usage(); }ARGEND memimageinit(); file = "<stdin>"; m = nil; switch(argc){ case 0: m = readmemimage(0); break; case 1: file = argv[0]; fd = open(file, OREAD); if(fd < 0) sysfatal("can't open %s: %r", file); m = readmemimage(fd); close(fd); break; default: usage(); } if(m == nil) sysfatal("can't read %s: %r", file); if(tostr == nil) tochan = m->chan; else{ tochan = strtochan(tostr); if(tochan == 0) sysfatal("bad channel descriptor '%s'", tostr); } n = allocmemimage(m->r, tochan); if(n == nil) sysfatal("can't allocate new image: %r"); memimagedraw(n, n->r, m, m->r.min, nil, ZP, S); if(uncompressed) writeuncompressed(1, n); else writememimage(1, n); exits(nil); }