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(the)h Fi(-f)e Fj(\015ag.)390 4388 y(If)k(no)f(\014le)h(names)f(are)i
(sp)s(eci\014ed,)e Fi(bzip2)g Fj(compresses)h(from)f(standard)g(input)g
(to)i(stan-)390 4491 y(dard)d(output.)44 b(In)32 b(this)f(case,)i
Fi(bzip2)e Fj(will)h(decline)g(to)h(write)f(compressed)g(output)f(to)i
(a)390 4595 y(terminal,)e(as)g(this)f(w)m(ould)g(b)s(e)g(en)m(tirely)i
(incomprehensible)e(and)g(therefore)h(p)s(oin)m(tless.)390
4746 y Fi(bunzip2)j Fj(\(or)j Fi(bzip2)29 b(-d)p Fj(\))36
b(decompresses)g(all)h(sp)s(eci\014ed)e(\014les.)58 b(Files)37
b(whic)m(h)f(w)m(ere)h(not)390 4850 y(created)f(b)m(y)e
Fi(bzip2)g Fj(will)g(b)s(e)g(detected)j(and)c(ignored,)k(and)c(a)i(w)m
(arning)g(issued.)52 b Fi(bzip2)390 4954 y Fj(attempts)29
b(to)f(guess)g(the)g(\014lename)f(for)h(the)g(decompressed)f(\014le)h
(from)f(that)h(of)g(the)g(com-)390 5058 y(pressed)i(\014le)g(as)h
(follo)m(ws:)570 5209 y Fi(filename.bz2)57 b Fj(b)s(ecomes)31
b Fi(filename)570 5340 y(filename.bz)58 b Fj(b)s(ecomes)30
b Fi(filename)p eop
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4 4 bop 150 -116 a Fl(Chapter)30 b(2:)41 b(Ho)m(w)31
b(to)g(use)f Fi(bzip2)2375 b Fl(4)570 299 y Fi(filename.tbz2)27
b Fj(b)s(ecomes)j Fi(filename.tar)570 470 y(filename.tbz)57
b Fj(b)s(ecomes)31 b Fi(filename.tar)570 641 y(anyothername)57
b Fj(b)s(ecomes)31 b Fi(anyothername.out)390 859 y Fj(If)i(the)g
(\014le)f(do)s(es)h(not)g(end)f(in)g(one)i(of)e(the)h(recognised)h
(endings,)f Fi(.bz2)p Fj(,)g Fi(.bz)p Fj(,)f Fi(.tbz2)g
Fj(or)390 963 y Fi(.tbz)p Fj(,)h Fi(bzip2)g Fj(complains)g(that)h(it)h
(cannot)f(guess)f(the)h(name)g(of)f(the)h(original)h(\014le,)g(and)390
1067 y(uses)30 b(the)h(original)g(name)f(with)h Fi(.out)e
Fj(app)s(ended.)390 1218 y(As)g(with)h(compression,)h(supplying)e(no)h
(\014lenames)f(causes)i(decompression)f(from)g(stan-)390
1321 y(dard)f(input)h(to)h(standard)f(output.)390 1472
y Fi(bunzip2)h Fj(will)j(correctly)i(decompress)d(a)h(\014le)f(whic)m
(h)g(is)h(the)g(concatenation)h(of)f(t)m(w)m(o)h(or)390
1576 y(more)i(compressed)g(\014les.)61 b(The)37 b(result)g(is)g(the)g
(concatenation)i(of)e(the)g(corresp)s(onding)390 1680
y(uncompressed)c(\014les.)52 b(In)m(tegrit)m(y)37 b(testing)e(\()p
Fi(-t)p Fj(\))f(of)h(concatenated)h(compressed)e(\014les)g(is)390
1784 y(also)d(supp)s(orted.)390 1935 y(Y)-8 b(ou)38 b(can)g(also)g
(compress)g(or)g(decompress)g(\014les)f(to)i(the)f(standard)f(output)g
(b)m(y)h(giving)390 2039 y(the)44 b Fi(-c)e Fj(\015ag.)79
b(Multiple)44 b(\014les)g(ma)m(y)f(b)s(e)g(compressed)g(and)f
(decompressed)h(lik)m(e)i(this.)390 2142 y(The)31 b(resulting)h
(outputs)e(are)i(fed)f(sequen)m(tially)h(to)g(stdout.)43
b(Compression)31 b(of)g(m)m(ultiple)390 2246 y(\014les)43
b(in)g(this)g(manner)g(generates)i(a)e(stream)h(con)m(taining)g(m)m
(ultiple)h(compressed)e(\014le)390 2350 y(represen)m(tations.)48
b(Suc)m(h)32 b(a)g(stream)h(can)f(b)s(e)g(decompressed)g(correctly)j
(only)d(b)m(y)g Fi(bzip2)390 2454 y Fj(v)m(ersion)h(0.9.0)h(or)f
(later.)48 b(Earlier)33 b(v)m(ersions)g(of)g Fi(bzip2)e
Fj(will)i(stop)g(after)g(decompressing)390 2558 y(the)e(\014rst)f
(\014le)g(in)g(the)h(stream.)390 2709 y Fi(bzcat)e Fj(\(or)i
Fi(bzip2)e(-dc)p Fj(\))h(decompresses)g(all)h(sp)s(eci\014ed)f(\014les)
g(to)i(the)e(standard)g(output.)390 2860 y Fi(bzip2)c
Fj(will)j(read)e(argumen)m(ts)i(from)e(the)h(en)m(vironmen)m(t)h(v)-5
b(ariables)28 b Fi(BZIP2)f Fj(and)g Fi(BZIP)p Fj(,)g(in)390
2963 y(that)21 b(order,)i(and)d(will)h(pro)s(cess)f(them)h(b)s(efore)g
(an)m(y)f(argumen)m(ts)h(read)g(from)f(the)h(command)390
3067 y(line.)41 b(This)30 b(giv)m(es)i(a)e(con)m(v)m(enien)m(t)j(w)m(a)
m(y)e(to)g(supply)e(default)i(argumen)m(ts.)390 3218
y(Compression)e(is)h(alw)m(a)m(ys)h(p)s(erformed,)e(ev)m(en)h(if)g(the)
g(compressed)f(\014le)h(is)g(sligh)m(tly)h(larger)390
3322 y(than)24 b(the)h(original.)40 b(Files)25 b(of)f(less)h(than)f(ab)
s(out)g(one)h(h)m(undred)d(b)m(ytes)j(tend)g(to)g(get)h(larger,)390
3426 y(since)33 b(the)g(compression)f(mec)m(hanism)h(has)f(a)h(constan)
m(t)g(o)m(v)m(erhead)h(in)e(the)h(region)g(of)g(50)390
3529 y(b)m(ytes.)50 b(Random)33 b(data)h(\(including)f(the)h(output)f
(of)g(most)h(\014le)g(compressors\))g(is)f(co)s(ded)390
3633 y(at)e(ab)s(out)f(8.05)i(bits)e(p)s(er)g(b)m(yte,)h(giving)h(an)e
(expansion)g(of)g(around)f(0.5\045.)390 3784 y(As)f(a)h(self-c)m(hec)m
(k)i(for)e(y)m(our)g(protection,)i Fi(bzip2)d Fj(uses)g(32-bit)i(CR)m
(Cs)f(to)g(mak)m(e)h(sure)e(that)390 3888 y(the)43 b(decompressed)g(v)m
(ersion)h(of)f(a)g(\014le)f(is)h(iden)m(tical)i(to)f(the)f(original.)79
b(This)43 b(guards)390 3992 y(against)h(corruption)f(of)h(the)f
(compressed)g(data,)k(and)42 b(against)i(undetected)g(bugs)e(in)390
4096 y Fi(bzip2)33 b Fj(\(hop)s(efully)i(v)m(ery)g(unlik)m(ely\).)55
b(The)35 b(c)m(hances)h(of)f(data)g(corruption)g(going)h(unde-)390
4199 y(tected)e(is)f(microscopic,)h(ab)s(out)e(one)h(c)m(hance)g(in)g
(four)f(billion)g(for)h(eac)m(h)g(\014le)g(pro)s(cessed.)390
4303 y(Be)j(a)m(w)m(are,)k(though,)d(that)g(the)g(c)m(hec)m(k)h(o)s
(ccurs)e(up)s(on)f(decompression,)j(so)f(it)f(can)h(only)390
4407 y(tell)28 b(y)m(ou)e(that)h(something)g(is)g(wrong.)39
b(It)27 b(can't)g(help)f(y)m(ou)h(reco)m(v)m(er)i(the)d(original)i
(uncom-)390 4511 y(pressed)f(data.)40 b(Y)-8 b(ou)27
b(can)g(use)h Fi(bzip2recover)23 b Fj(to)29 b(try)e(to)i(reco)m(v)m(er)
g(data)f(from)f(damaged)390 4614 y(\014les.)390 4766
y(Return)42 b(v)-5 b(alues:)65 b(0)42 b(for)h(a)f(normal)g(exit,)47
b(1)c(for)f(en)m(vironmen)m(tal)i(problems)e(\(\014le)h(not)390
4869 y(found,)29 b(in)m(v)-5 b(alid)30 b(\015ags,)g(I/O)h(errors,)g
(&c\),)f(2)h(to)f(indicate)h(a)f(corrupt)g(compressed)g(\014le,)h(3)390
4973 y(for)f(an)g(in)m(ternal)i(consistency)f(error)g(\(eg,)h(bug\))e
(whic)m(h)g(caused)g Fi(bzip2)f Fj(to)i(panic.)390 5304
y Fe(OPTIONS)p eop
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5 5 bop 150 -116 a Fl(Chapter)30 b(2:)41 b(Ho)m(w)31
b(to)g(use)f Fi(bzip2)2375 b Fl(5)390 299 y Fi(-c)30
b(--stdout)870 403 y Fj(Compress)g(or)g(decompress)h(to)g(standard)e
(output.)390 550 y Fi(-d)h(--decompress)870 653 y Fj(F)-8
b(orce)42 b(decompression.)72 b Fi(bzip2)p Fj(,)43 b
Fi(bunzip2)38 b Fj(and)i Fi(bzcat)g Fj(are)h(really)h(the)870
757 y(same)26 b(program,)i(and)d(the)h(decision)h(ab)s(out)f(what)g
(actions)h(to)g(tak)m(e)h(is)e(done)870 861 y(on)j(the)h(basis)f(of)g
(whic)m(h)h(name)f(is)g(used.)40 b(This)29 b(\015ag)g(o)m(v)m(errides)i
(that)f(mec)m(h-)870 965 y(anism,)g(and)g(forces)h(bzip2)f(to)h
(decompress.)390 1112 y Fi(-z)f(--compress)870 1215 y
Fj(The)37 b(complemen)m(t)h(to)g Fi(-d)p Fj(:)54 b(forces)37
b(compression,)j(regardless)d(of)h(the)f(in-)870 1319
y(v)m(ok)-5 b(ation)32 b(name.)390 1466 y Fi(-t)e(--test)66
b Fj(Chec)m(k)26 b(in)m(tegrit)m(y)i(of)e(the)g(sp)s(eci\014ed)f
(\014le\(s\),)i(but)e(don't)h(decompress)g(them.)870
1570 y(This)39 b(really)h(p)s(erforms)f(a)g(trial)h(decompression)g
(and)e(thro)m(ws)i(a)m(w)m(a)m(y)h(the)870 1674 y(result.)390
1821 y Fi(-f)30 b(--force)870 1924 y Fj(F)-8 b(orce)27
b(o)m(v)m(erwrite)h(of)e(output)g(\014les.)39 b(Normally)-8
b(,)28 b Fi(bzip2)c Fj(will)j(not)f(o)m(v)m(erwrite)870
2028 y(existing)i(output)e(\014les.)40 b(Also)27 b(forces)g
Fi(bzip2)f Fj(to)h(break)g(hard)f(links)g(to)i(\014les,)870
2132 y(whic)m(h)i(it)h(otherwise)g(w)m(ouldn't)g(do.)870
2257 y Fi(bzip2)h Fj(normally)h(declines)h(to)f(decompress)h(\014les)f
(whic)m(h)f(don't)i(ha)m(v)m(e)g(the)870 2361 y(correct)39
b(magic)g(header)e(b)m(ytes.)63 b(If)38 b(forced)g(\()p
Fi(-f)p Fj(\),)h(ho)m(w)m(ev)m(er,)i(it)e(will)f(pass)870
2465 y(suc)m(h)30 b(\014les)g(through)g(unmo)s(di\014ed.)39
b(This)30 b(is)h(ho)m(w)f(GNU)h Fi(gzip)e Fj(b)s(eha)m(v)m(es.)390
2612 y Fi(-k)h(--keep)66 b Fj(Keep)34 b(\(don't)g(delete\))h(input)d
(\014les)i(during)e(compression)i(or)f(decompres-)870
2716 y(sion.)390 2863 y Fi(-s)d(--small)870 2966 y Fj(Reduce)35
b(memory)g(usage,)i(for)e(compression,)i(decompression)e(and)f(test-)
870 3070 y(ing.)40 b(Files)29 b(are)f(decompressed)g(and)f(tested)i
(using)f(a)g(mo)s(di\014ed)f(algorithm)870 3174 y(whic)m(h)32
b(only)g(requires)h(2.5)g(b)m(ytes)g(p)s(er)f(blo)s(c)m(k)g(b)m(yte.)48
b(This)32 b(means)f(an)m(y)i(\014le)870 3278 y(can)d(b)s(e)f
(decompressed)g(in)h(2300k)h(of)f(memory)-8 b(,)31 b(alb)s(eit)f(at)g
(ab)s(out)f(half)h(the)870 3381 y(normal)g(sp)s(eed.)870
3507 y(During)35 b(compression,)j Fi(-s)d Fj(selects)j(a)e(blo)s(c)m(k)
h(size)f(of)h(200k,)h(whic)m(h)e(limits)870 3611 y(memory)43
b(use)f(to)h(around)e(the)i(same)f(\014gure,)k(at)d(the)f(exp)s(ense)g
(of)h(y)m(our)870 3714 y(compression)32 b(ratio.)47 b(In)31
b(short,)i(if)e(y)m(our)i(mac)m(hine)f(is)g(lo)m(w)g(on)g(memory)g(\(8)
870 3818 y(megab)m(ytes)39 b(or)e(less\),)j(use)d(-s)g(for)g(ev)m
(erything.)62 b(See)38 b(MEMOR)-8 b(Y)37 b(MAN-)870 3922
y(A)m(GEMENT)31 b(b)s(elo)m(w.)390 4069 y Fi(-q)f(--quiet)870
4173 y Fj(Suppress)h(non-essen)m(tial)j(w)m(arning)f(messages.)49
b(Messages)34 b(p)s(ertaining)f(to)870 4276 y(I/O)e(errors)g(and)e
(other)i(critical)i(ev)m(en)m(ts)f(will)e(not)h(b)s(e)f(suppressed.)390
4423 y Fi(-v)g(--verbose)870 4527 y Fj(V)-8 b(erb)s(ose)25
b(mo)s(de)f({)h(sho)m(w)f(the)h(compression)g(ratio)g(for)g(eac)m(h)g
(\014le)g(pro)s(cessed.)870 4631 y(F)-8 b(urther)27 b
Fi(-v)p Fj('s)g(increase)h(the)g(v)m(erb)s(osit)m(y)g(lev)m(el,)i(sp)s
(ewing)d(out)g(lots)h(of)g(infor-)870 4735 y(mation)j(whic)m(h)f(is)g
(primarily)h(of)f(in)m(terest)i(for)f(diagnostic)g(purp)s(oses.)390
4882 y Fi(-L)f(--license)e(-V)h(--version)870 4985 y
Fj(Displa)m(y)i(the)f(soft)m(w)m(are)i(v)m(ersion,)g(license)f(terms)g
(and)e(conditions.)390 5132 y Fi(-1)h(\(or)f(--fast\))g(to)g(-9)h(\(or)
g(--best\))870 5236 y Fj(Set)h(the)g(blo)s(c)m(k)g(size)g(to)h(100)g
(k,)e(200)i(k)f(..)41 b(900)32 b(k)f(when)e(compressing.)42
b(Has)870 5340 y(no)37 b(e\013ect)i(when)d(decompressing.)62
b(See)37 b(MEMOR)-8 b(Y)38 b(MANA)m(GEMENT)p eop
%%Page: 6 7
6 6 bop 150 -116 a Fl(Chapter)30 b(2:)41 b(Ho)m(w)31
b(to)g(use)f Fi(bzip2)2375 b Fl(6)870 299 y Fj(b)s(elo)m(w.)83
b(The)44 b Fi(--fast)f Fj(and)g Fi(--best)g Fj(aliases)i(are)g
(primarily)f(for)g(GNU)870 403 y Fi(gzip)27 b Fj(compatibilit)m(y)-8
b(.)43 b(In)28 b(particular,)i Fi(--fast)d Fj(do)s(esn't)h(mak)m(e)i
(things)e(sig-)870 506 y(ni\014can)m(tly)d(faster.)40
b(And)23 b Fi(--best)g Fj(merely)i(selects)h(the)f(default)g(b)s(eha)m
(viour.)390 674 y Fi(--)384 b Fj(T)-8 b(reats)38 b(all)f(subsequen)m(t)
f(argumen)m(ts)g(as)h(\014le)f(names,)i(ev)m(en)f(if)f(they)h(start)870
778 y(with)31 b(a)h(dash.)42 b(This)31 b(is)h(so)f(y)m(ou)h(can)f
(handle)g(\014les)g(with)h(names)f(b)s(eginning)870 881
y(with)f(a)h(dash,)e(for)i(example:)41 b Fi(bzip2)29
b(--)h(-myfilename)p Fj(.)390 1049 y Fi(--repetitive-fast)390
1185 y(--repetitive-best)870 1288 y Fj(These)j(\015ags)g(are)g
(redundan)m(t)f(in)h(v)m(ersions)g(0.9.5)i(and)d(ab)s(o)m(v)m(e.)49
b(They)33 b(pro-)870 1392 y(vided)g(some)h(coarse)h(con)m(trol)g(o)m(v)
m(er)g(the)f(b)s(eha)m(viour)f(of)h(the)g(sorting)g(algo-)870
1496 y(rithm)j(in)g(earlier)h(v)m(ersions,)i(whic)m(h)d(w)m(as)g
(sometimes)h(useful.)61 b(0.9.5)39 b(and)870 1600 y(ab)s(o)m(v)m(e)31
b(ha)m(v)m(e)f(an)g(impro)m(v)m(ed)g(algorithm)h(whic)m(h)e(renders)g
(these)h(\015ags)g(irrel-)870 1704 y(ev)-5 b(an)m(t.)390
1964 y Fe(MEMOR)-10 b(Y)40 b(MANA)m(GEMENT)390 2151 y
Fi(bzip2)23 b Fj(compresses)i(large)h(\014les)e(in)g(blo)s(c)m(ks.)40
b(The)24 b(blo)s(c)m(k)h(size)h(a\013ects)g(b)s(oth)e(the)g(compres-)
390 2255 y(sion)38 b(ratio)g(ac)m(hiev)m(ed,)k(and)36
b(the)i(amoun)m(t)g(of)g(memory)g(needed)f(for)h(compression)g(and)390
2358 y(decompression.)57 b(The)35 b(\015ags)h Fi(-1)f
Fj(through)g Fi(-9)g Fj(sp)s(ecify)g(the)h(blo)s(c)m(k)g(size)h(to)f(b)
s(e)f(100,000)390 2462 y(b)m(ytes)25 b(through)f(900,000)j(b)m(ytes)e
(\(the)h(default\))e(resp)s(ectiv)m(ely)-8 b(.)41 b(A)m(t)25
b(decompression)g(time,)390 2566 y(the)k(blo)s(c)m(k)h(size)g(used)f
(for)g(compression)g(is)g(read)h(from)f(the)g(header)g(of)g(the)h
(compressed)390 2670 y(\014le,)j(and)f Fi(bunzip2)f Fj(then)h(allo)s
(cates)i(itself)g(just)e(enough)g(memory)h(to)g(decompress)g(the)390
2773 y(\014le.)40 b(Since)27 b(blo)s(c)m(k)h(sizes)h(are)f(stored)g(in)
f(compressed)g(\014les,)h(it)h(follo)m(ws)f(that)g(the)g(\015ags)g
Fi(-1)390 2877 y Fj(to)j Fi(-9)f Fj(are)h(irrelev)-5
b(an)m(t)32 b(to)f(and)f(so)g(ignored)h(during)e(decompression.)390
3028 y(Compression)h(and)f(decompression)i(requiremen)m(ts,)g(in)f(b)m
(ytes,)i(can)e(b)s(e)g(estimated)i(as:)869 3179 y Fi(Compression:)140
b(400k)46 b(+)i(\()f(8)h(x)f(block)f(size)h(\))869 3387
y(Decompression:)d(100k)i(+)i(\()f(4)h(x)f(block)f(size)h(\),)g(or)1585
3491 y(100k)f(+)i(\()f(2.5)g(x)g(block)g(size)f(\))390
3642 y Fj(Larger)27 b(blo)s(c)m(k)f(sizes)h(giv)m(e)h(rapidly)e
(diminishing)f(marginal)i(returns.)39 b(Most)27 b(of)f(the)h(com-)390
3745 y(pression)e(comes)i(from)f(the)g(\014rst)f(t)m(w)m(o)i(or)f
(three)h(h)m(undred)d(k)h(of)h(blo)s(c)m(k)g(size,)i(a)e(fact)h(w)m
(orth)390 3849 y(b)s(earing)32 b(in)g(mind)f(when)g(using)h
Fi(bzip2)f Fj(on)h(small)g(mac)m(hines.)47 b(It)32 b(is)h(also)f(imp)s
(ortan)m(t)h(to)390 3953 y(appreciate)f(that)g(the)f(decompression)g
(memory)g(requiremen)m(t)h(is)f(set)g(at)h(compression)390
4057 y(time)f(b)m(y)f(the)h(c)m(hoice)h(of)f(blo)s(c)m(k)g(size.)390
4208 y(F)-8 b(or)43 b(\014les)f(compressed)h(with)f(the)g(default)h
(900k)g(blo)s(c)m(k)g(size,)k Fi(bunzip2)40 b Fj(will)j(require)390
4311 y(ab)s(out)28 b(3700)i(kb)m(ytes)f(to)h(decompress.)40
b(T)-8 b(o)29 b(supp)s(ort)e(decompression)i(of)g(an)m(y)f(\014le)h(on)
f(a)h(4)390 4415 y(megab)m(yte)h(mac)m(hine,)g Fi(bunzip2)c
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b(alue)29 b(with)h(that)f(of)h Fi(avail_in)d Fj(o)m(v)m(er)k(subsequen)
m(t)d(calls)j(to)f Fi(BZ2_bzCompress)p Fj(,)c(the)150
1818 y(library)k(can)f(detect)j(an)m(y)e(attempts)h(to)f(slip)g(in)f
(more)h(data)g(to)h(compress.)41 b(An)m(y)29 b(calls)i(for)e(whic)m(h)h
(this)150 1928 y(is)h(detected)i(will)f(return)f Fi(BZ_SEQUENCE_ERROR)p
Fj(.)39 b(This)31 b(indicates)i(a)e(programming)g(mistak)m(e)i(whic)m
(h)150 2037 y(should)c(b)s(e)h(corrected.)150 2194 y(Instead)36
b(of)g(asking)h(to)g(\014nish,)f(the)h(calling)g(program)f(ma)m(y)h
(ask)f Fi(BZ2_bzCompress)c Fj(to)37 b(tak)m(e)h(all)f(the)150
2304 y(remaining)f(input,)g(compress)f(it)h(and)f(terminate)h(the)g
(curren)m(t)g(\(Burro)m(ws-Wheeler\))h(compression)150
2413 y(blo)s(c)m(k.)j(This)25 b(could)h(b)s(e)g(useful)f(for)h(error)g
(con)m(trol)i(purp)s(oses.)38 b(The)26 b(mec)m(hanism)g(is)g(analogous)
h(to)f(that)150 2523 y(for)35 b(\014nishing:)48 b(call)35
b Fi(BZ2_bzCompress)c Fj(with)k(an)f(action)i(of)f Fi(BZ_FLUSH)p
Fj(,)f(remo)m(v)m(e)i(output)f(data,)h(and)150 2632 y(p)s(ersist)i
(with)g(the)h Fi(BZ_FLUSH)d Fj(action)k(un)m(til)e(the)h(v)-5
b(alue)39 b Fi(BZ_RUN)d Fj(is)j(returned.)64 b(As)38
b(with)g(\014nishing,)150 2742 y Fi(BZ2_bzCompress)21
b Fj(detects)27 b(an)m(y)f(attempt)g(to)h(pro)m(vide)e(more)h(input)f
(data)g(once)i(the)e(\015ush)f(has)h(b)s(egun.)150 2899
y(Once)31 b(the)g(\015ush)d(is)j(complete,)h(the)f(stream)f(returns)g
(to)i(the)e(normal)h(R)m(UNNING)h(state.)150 3056 y(This)f(all)g
(sounds)f(prett)m(y)i(complex,)g(but)f(isn't)g(really)-8
b(.)44 b(Here's)32 b(a)f(table)h(whic)m(h)e(sho)m(ws)h(whic)m(h)g
(actions)150 3165 y(are)d(allo)m(w)m(able)i(in)e(eac)m(h)h(state,)h
(what)d(action)j(will)e(b)s(e)f(tak)m(en,)j(what)d(the)i(next)f(state)h
(is,)g(and)e(what)h(the)150 3275 y(non-error)g(return)f(v)-5
b(alues)28 b(are.)40 b(Note)30 b(that)e(y)m(ou)g(can't)g(explicitly)i
(ask)d(what)h(state)h(the)f(stream)g(is)g(in,)150 3384
y(but)h(nor)h(do)f(y)m(ou)h(need)g(to)g({)h(it)f(can)g(b)s(e)f
(inferred)g(from)h(the)g(v)-5 b(alues)30 b(returned)f(b)m(y)h
Fi(BZ2_bzCompress)p Fj(.)390 3535 y(IDLE/)p Fi(any)572
3639 y Fj(Illegal.)63 b(IDLE)29 b(state)j(only)e(exists)h(after)g
Fi(BZ2_bzCompressEnd)26 b Fj(or)572 3743 y(b)s(efore)k
Fi(BZ2_bzCompressInit)p Fj(.)572 3847 y(Return)g(v)-5
b(alue)31 b(=)f Fi(BZ_SEQUENCE_ERROR)390 4054 y Fj(R)m(UNNING/)p
Fi(BZ_RUN)572 4158 y Fj(Compress)g(from)g Fi(next_in)e
Fj(to)j Fi(next_out)d Fj(as)j(m)m(uc)m(h)f(as)h(p)s(ossible.)572
4262 y(Next)g(state)h(=)e(R)m(UNNING)572 4366 y(Return)g(v)-5
b(alue)31 b(=)f Fi(BZ_RUN_OK)390 4573 y Fj(R)m(UNNING/)p
Fi(BZ_FLUSH)572 4677 y Fj(Remem)m(b)s(er)g(curren)m(t)h(v)-5
b(alue)31 b(of)f Fi(next_in)p Fj(.)59 b(Compress)30 b(from)g
Fi(next_in)572 4781 y Fj(to)h Fi(next_out)d Fj(as)j(m)m(uc)m(h)f(as)g
(p)s(ossible,)g(but)g(do)h(not)f(accept)i(an)m(y)e(more)h(input.)572
4885 y(Next)g(state)h(=)e(FLUSHING)572 4988 y(Return)g(v)-5
b(alue)31 b(=)f Fi(BZ_FLUSH_OK)390 5196 y Fj(R)m(UNNING/)p
Fi(BZ_FINISH)572 5300 y Fj(Remem)m(b)s(er)g(curren)m(t)h(v)-5
b(alue)31 b(of)f Fi(next_in)p Fj(.)59 b(Compress)30 b(from)g
Fi(next_in)p eop
%%Page: 17 18
17 17 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(17)572 299 y Fj(to)31
b Fi(next_out)d Fj(as)j(m)m(uc)m(h)f(as)g(p)s(ossible,)g(but)g(do)h
(not)f(accept)i(an)m(y)e(more)h(input.)572 403 y(Next)g(state)h(=)e
(FINISHING)572 506 y(Return)g(v)-5 b(alue)31 b(=)f Fi(BZ_FINISH_OK)390
714 y Fj(FLUSHING/)p Fi(BZ_FLUSH)572 818 y Fj(Compress)g(from)g
Fi(next_in)e Fj(to)j Fi(next_out)d Fj(as)j(m)m(uc)m(h)f(as)h(p)s
(ossible,)572 922 y(but)f(do)g(not)h(accept)g(an)m(y)g(more)g(input.)
572 1025 y(If)f(all)h(the)g(existing)g(input)f(has)g(b)s(een)f(used)h
(up)f(and)h(all)h(compressed)572 1129 y(output)f(has)g(b)s(een)g(remo)m
(v)m(ed)663 1233 y(Next)h(state)h(=)e(R)m(UNNING;)i(Return)e(v)-5
b(alue)31 b(=)f Fi(BZ_RUN_OK)572 1337 y Fj(else)663 1440
y(Next)h(state)h(=)e(FLUSHING;)g(Return)h(v)-5 b(alue)30
b(=)g Fi(BZ_FLUSH_OK)390 1648 y Fj(FLUSHING/other)572
1752 y(Illegal.)572 1856 y(Return)g(v)-5 b(alue)31 b(=)f
Fi(BZ_SEQUENCE_ERROR)390 2063 y Fj(FINISHING/)p Fi(BZ_FINISH)572
2167 y Fj(Compress)g(from)g Fi(next_in)e Fj(to)j Fi(next_out)d
Fj(as)j(m)m(uc)m(h)f(as)h(p)s(ossible,)572 2271 y(but)f(to)h(not)g
(accept)g(an)m(y)g(more)g(input.)572 2374 y(If)f(all)h(the)g(existing)g
(input)f(has)g(b)s(een)f(used)h(up)f(and)h(all)h(compressed)572
2478 y(output)f(has)g(b)s(een)g(remo)m(v)m(ed)663 2582
y(Next)h(state)h(=)e(IDLE;)f(Return)i(v)-5 b(alue)30
b(=)g Fi(BZ_STREAM_END)572 2686 y Fj(else)663 2790 y(Next)h(state)h(=)e
(FINISHING;)h(Return)g(v)-5 b(alue)30 b(=)g Fi(BZ_FINISHING)390
2997 y Fj(FINISHING/other)572 3101 y(Illegal.)572 3205
y(Return)g(v)-5 b(alue)31 b(=)f Fi(BZ_SEQUENCE_ERROR)150
3361 y Fj(That)23 b(still)h(lo)s(oks)g(complicated?)39
b(W)-8 b(ell,)26 b(fair)d(enough.)39 b(The)23 b(usual)f(sequence)h(of)h
(calls)g(for)f(compressing)150 3471 y(a)30 b(load)h(of)g(data)f(is:)225
3628 y Fh(\017)60 b Fj(Get)32 b(started)f(with)f Fi(BZ2_bzCompressInit)
p Fj(.)225 3774 y Fh(\017)60 b Fj(Sho)m(v)m(el)37 b(data)g(in)f(and)g
(shlurp)f(out)i(its)f(compressed)h(form)f(using)g(zero)i(or)e(more)h
(calls)h(of)e Fi(BZ2_)330 3884 y(bzCompress)28 b Fj(with)i(action)h(=)f
Fi(BZ_RUN)p Fj(.)225 4030 y Fh(\017)60 b Fj(Finish)24
b(up.)38 b(Rep)s(eatedly)25 b(call)h Fi(BZ2_bzCompress)21
b Fj(with)k(action)h(=)e Fi(BZ_FINISH)p Fj(,)g(cop)m(ying)h(out)h(the)
330 4139 y(compressed)k(output,)h(un)m(til)g Fi(BZ_STREAM_END)26
b Fj(is)31 b(returned.)225 4285 y Fh(\017)60 b Fj(Close)31
b(up)e(and)h(go)h(home.)41 b(Call)30 b Fi(BZ2_bzCompressEnd)p
Fj(.)150 4478 y(If)23 b(the)g(data)g(y)m(ou)h(w)m(an)m(t)g(to)f
(compress)g(\014ts)g(in)m(to)h(y)m(our)g(input)e(bu\013er)g(all)i(at)f
(once,)j(y)m(ou)d(can)g(skip)g(the)g(calls)150 4588 y(of)37
b Fi(BZ2_bzCompress)26 b(\()k(...,)f(BZ_RUN)g(\))36 b
Fj(and)g(just)g(do)g(the)h Fi(BZ2_bzCompress)26 b(\()k(...,)f
(BZ_FINISH)150 4698 y(\))h Fj(calls.)150 4854 y(All)35
b(required)g(memory)h(is)f(allo)s(cated)i(b)m(y)e Fi
(BZ2_bzCompressInit)p Fj(.)51 b(The)35 b(compression)h(library)f(can)
150 4964 y(accept)f(an)m(y)e(data)h(at)g(all)h(\(ob)m(viously\).)48
b(So)32 b(y)m(ou)h(shouldn't)f(get)i(an)m(y)f(error)g(return)f(v)-5
b(alues)32 b(from)h(the)150 5074 y Fi(BZ2_bzCompress)28
b Fj(calls.)48 b(If)32 b(y)m(ou)g(do,)h(they)g(will)g(b)s(e)e
Fi(BZ_SEQUENCE_ERROR)p Fj(,)e(and)i(indicate)i(a)g(bug)e(in)150
5183 y(y)m(our)g(programming.)150 5340 y(T)-8 b(rivial)32
b(other)f(p)s(ossible)f(return)g(v)-5 b(alues:)p eop
%%Page: 18 19
18 18 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(18)572 299 y Fi(BZ_PARAM_ERROR)663
403 y Fj(if)30 b Fi(strm)f Fj(is)i Fi(NULL)p Fj(,)e(or)i
Fi(strm->s)d Fj(is)j Fi(NULL)150 652 y Fe(3.3.3)63 b
Fd(BZ2_bzCompressEnd)390 839 y Fi(int)47 b(BZ2_bzCompressEnd)c(\()k
(bz_stream)f(*strm)g(\);)150 996 y Fj(Releases)32 b(all)f(memory)f
(asso)s(ciated)i(with)e(a)h(compression)f(stream.)150
1153 y(P)m(ossible)i(return)e(v)-5 b(alues:)481 1304
y Fi(BZ_PARAM_ERROR)117 b Fj(if)31 b Fi(strm)e Fj(is)h
Fi(NULL)f Fj(or)i Fi(strm->s)d Fj(is)j Fi(NULL)481 1408
y(BZ_OK)120 b Fj(otherwise)150 1657 y Fe(3.3.4)63 b Fd
(BZ2_bzDecompressInit)390 1844 y Fi(int)47 b(BZ2_bzDecompressInit)42
b(\()48 b(bz_stream)d(*strm,)h(int)h(verbosity,)e(int)i(small)f(\);)150
2001 y Fj(Prepares)39 b(for)f(decompression.)65 b(As)38
b(with)h Fi(BZ2_bzCompressInit)p Fj(,)c(a)k Fi(bz_stream)d
Fj(record)j(should)150 2110 y(b)s(e)30 b(allo)s(cated)j(and)d
(initialised)i(b)s(efore)f(the)g(call.)44 b(Fields)31
b Fi(bzalloc)p Fj(,)e Fi(bzfree)g Fj(and)h Fi(opaque)g
Fj(should)g(b)s(e)150 2220 y(set)35 b(if)f(a)g(custom)h(memory)f(allo)s
(cator)i(is)e(required,)h(or)g(made)f Fi(NULL)f Fj(for)h(the)g(normal)g
Fi(malloc)p Fj(/)p Fi(free)150 2330 y Fj(routines.)72
b(Up)s(on)40 b(return,)j(the)e(in)m(ternal)h(state)g(will)g(ha)m(v)m(e)
f(b)s(een)f(initialised,)45 b(and)40 b Fi(total_in)f
Fj(and)150 2439 y Fi(total_out)28 b Fj(will)j(b)s(e)e(zero.)150
2596 y(F)-8 b(or)31 b(the)g(meaning)f(of)h(parameter)g
Fi(verbosity)p Fj(,)d(see)j Fi(BZ2_bzCompressInit)p Fj(.)150
2753 y(If)26 b Fi(small)f Fj(is)i(nonzero,)h(the)f(library)f(will)h
(use)f(an)g(alternativ)m(e)j(decompression)e(algorithm)g(whic)m(h)f
(uses)150 2862 y(less)42 b(memory)h(but)e(at)i(the)f(cost)i(of)e
(decompressing)g(more)h(slo)m(wly)g(\(roughly)f(sp)s(eaking,)j(half)d
(the)150 2972 y(sp)s(eed,)29 b(but)f(the)h(maxim)m(um)f(memory)i
(requiremen)m(t)f(drops)f(to)i(around)e(2300k\).)42 b(See)29
b(Chapter)g(2)g(for)150 3082 y(more)i(information)g(on)f(memory)g
(managemen)m(t.)150 3238 y(Note)37 b(that)f(the)g(amoun)m(t)g(of)g
(memory)g(needed)f(to)h(decompress)g(a)g(stream)g(cannot)g(b)s(e)f
(determined)150 3348 y(un)m(til)41 b(the)f(stream's)h(header)f(has)g(b)
s(een)f(read,)k(so)e(ev)m(en)g(if)f Fi(BZ2_bzDecompressInit)35
b Fj(succeeds,)43 b(a)150 3458 y(subsequen)m(t)30 b Fi
(BZ2_bzDecompress)c Fj(could)k(fail)h(with)f Fi(BZ_MEM_ERROR)p
Fj(.)150 3614 y(P)m(ossible)i(return)e(v)-5 b(alues:)572
3765 y Fi(BZ_CONFIG_ERROR)663 3869 y Fj(if)30 b(the)h(library)f(has)g
(b)s(een)g(mis-compiled)572 3973 y Fi(BZ_PARAM_ERROR)663
4077 y Fj(if)g Fi(\(small)46 b(!=)h(0)h(&&)f(small)f(!=)h(1\))663
4181 y Fj(or)30 b Fi(\(verbosity)45 b(<)j(0)f(||)g(verbosity)f(>)h(4\))
572 4284 y(BZ_MEM_ERROR)663 4388 y Fj(if)30 b(insu\016cien)m(t)h
(memory)f(is)h(a)m(v)-5 b(ailable)150 4545 y(Allo)m(w)m(able)32
b(next)f(actions:)572 4696 y Fi(BZ2_bzDecompress)663
4800 y Fj(if)f Fi(BZ_OK)f Fj(w)m(as)h(returned)572 4904
y(no)g(sp)s(eci\014c)g(action)i(required)e(in)g(case)h(of)g(error)150
5153 y Fe(3.3.5)63 b Fd(BZ2_bzDecompress)390 5340 y Fi(int)47
b(BZ2_bzDecompress)c(\()48 b(bz_stream)d(*strm)h(\);)p
eop
%%Page: 19 20
19 19 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(19)150 299 y Fj(Pro)m(vides)41
b(more)g(input)f(and/out)g(output)h(bu\013er)e(space)i(for)f(the)h
(library)-8 b(.)71 b(The)41 b(caller)h(main)m(tains)150
408 y(input)30 b(and)f(output)h(bu\013ers,)g(and)g(uses)g
Fi(BZ2_bzDecompress)25 b Fj(to)32 b(transfer)e(data)h(b)s(et)m(w)m(een)
g(them.)150 565 y(Before)45 b(eac)m(h)h(call)f(to)h Fi
(BZ2_bzDecompress)p Fj(,)e Fi(next_in)e Fj(should)i(p)s(oin)m(t)h(at)g
(the)g(compressed)f(data,)150 675 y(and)33 b Fi(avail_in)e
Fj(should)i(indicate)i(ho)m(w)e(man)m(y)h(b)m(ytes)g(the)g(library)g
(ma)m(y)g(read.)50 b Fi(BZ2_bzDecompress)150 784 y Fj(up)s(dates)29
b Fi(next_in)p Fj(,)g Fi(avail_in)f Fj(and)i Fi(total_in)e
Fj(to)j(re\015ect)g(the)g(n)m(um)m(b)s(er)e(of)i(b)m(ytes)g(it)g(has)f
(read.)150 941 y(Similarly)-8 b(,)40 b Fi(next_out)34
b Fj(should)i(p)s(oin)m(t)h(to)h(a)f(bu\013er)f(in)h(whic)m(h)g(the)g
(uncompressed)f(output)h(is)g(to)h(b)s(e)150 1051 y(placed,)f(with)e
Fi(avail_out)e Fj(indicating)j(ho)m(w)f(m)m(uc)m(h)h(output)f(space)g
(is)h(a)m(v)-5 b(ailable.)57 b Fi(BZ2_bzCompress)150
1160 y Fj(up)s(dates)29 b Fi(next_out)p Fj(,)g Fi(avail_out)f
Fj(and)h Fi(total_out)f Fj(to)j(re\015ect)h(the)e(n)m(um)m(b)s(er)g(of)
g(b)m(ytes)h(output.)150 1317 y(Y)-8 b(ou)39 b(ma)m(y)g(pro)m(vide)g
(and)f(remo)m(v)m(e)i(as)f(little)i(or)e(as)g(m)m(uc)m(h)f(data)h(as)g
(y)m(ou)g(lik)m(e)h(on)f(eac)m(h)g(call)h(of)f Fi(BZ2_)150
1427 y(bzDecompress)p Fj(.)d(In)27 b(the)h(limit,)h(it)f(is)f
(acceptable)i(to)f(supply)e(and)g(remo)m(v)m(e)j(data)f(one)g(b)m(yte)g
(at)f(a)h(time,)150 1537 y(although)f(this)g(w)m(ould)f(b)s(e)g
(terribly)i(ine\016cien)m(t.)40 b(Y)-8 b(ou)27 b(should)f(alw)m(a)m(ys)
i(ensure)e(that)h(at)g(least)h(one)f(b)m(yte)150 1646
y(of)k(output)f(space)g(is)h(a)m(v)-5 b(ailable)32 b(at)f(eac)m(h)g
(call.)150 1803 y(Use)g(of)f Fi(BZ2_bzDecompress)c Fj(is)k(simpler)h
(than)f Fi(BZ2_bzCompress)p Fj(.)150 1960 y(Y)-8 b(ou)28
b(should)f(pro)m(vide)i(input)f(and)f(remo)m(v)m(e)j(output)e(as)g
(describ)s(ed)g(ab)s(o)m(v)m(e,)i(and)d(rep)s(eatedly)i(call)g
Fi(BZ2_)150 2069 y(bzDecompress)k Fj(un)m(til)k Fi(BZ_STREAM_END)c
Fj(is)k(returned.)59 b(App)s(earance)36 b(of)g Fi(BZ_STREAM_END)d
Fj(denotes)150 2179 y(that)45 b Fi(BZ2_bzDecompress)40
b Fj(has)45 b(detected)h(the)f(logical)i(end)d(of)g(the)h(compressed)g
(stream.)84 b Fi(BZ2_)150 2289 y(bzDecompress)27 b Fj(will)k(not)g(pro)
s(duce)e Fi(BZ_STREAM_END)e Fj(un)m(til)k(all)g(output)g(data)f(has)g
(b)s(een)g(placed)h(in)m(to)150 2398 y(the)k(output)f(bu\013er,)i(so)e
(once)i Fi(BZ_STREAM_END)31 b Fj(app)s(ears,)k(y)m(ou)g(are)g(guaran)m
(teed)g(to)h(ha)m(v)m(e)f(a)m(v)-5 b(ailable)150 2508
y(all)31 b(the)g(decompressed)f(output,)h(and)e Fi(BZ2_bzDecompressEnd)
c Fj(can)31 b(safely)f(b)s(e)g(called.)150 2665 y(If)38
b(case)i(of)f(an)f(error)h(return)f(v)-5 b(alue,)42 b(y)m(ou)d(should)e
(call)j Fi(BZ2_bzDecompressEnd)33 b Fj(to)40 b(clean)f(up)f(and)150
2774 y(release)32 b(memory)-8 b(.)150 2931 y(P)m(ossible)32
b(return)e(v)-5 b(alues:)572 3082 y Fi(BZ_PARAM_ERROR)663
3186 y Fj(if)30 b Fi(strm)f Fj(is)i Fi(NULL)e Fj(or)i
Fi(strm->s)d Fj(is)i Fi(NULL)663 3290 y Fj(or)g Fi(strm->avail_out)44
b(<)j(1)572 3393 y(BZ_DATA_ERROR)663 3497 y Fj(if)30
b(a)h(data)f(in)m(tegrit)m(y)j(error)e(is)f(detected)i(in)e(the)h
(compressed)g(stream)572 3601 y Fi(BZ_DATA_ERROR_MAGIC)663
3705 y Fj(if)f(the)h(compressed)f(stream)h(do)s(esn't)f(b)s(egin)g
(with)h(the)f(righ)m(t)i(magic)f(b)m(ytes)572 3808 y
Fi(BZ_MEM_ERROR)663 3912 y Fj(if)f(there)h(w)m(asn't)g(enough)f(memory)
h(a)m(v)-5 b(ailable)572 4016 y Fi(BZ_STREAM_END)663
4120 y Fj(if)30 b(the)h(logical)h(end)e(of)h(the)f(data)h(stream)g(w)m
(as)f(detected)i(and)e(all)663 4224 y(output)g(in)g(has)g(b)s(een)g
(consumed,)g(eg)h Fi(s->avail_out)44 b(>)k(0)572 4327
y(BZ_OK)663 4431 y Fj(otherwise)150 4588 y(Allo)m(w)m(able)32
b(next)f(actions:)572 4739 y Fi(BZ2_bzDecompress)663
4843 y Fj(if)f Fi(BZ_OK)f Fj(w)m(as)h(returned)572 4946
y Fi(BZ2_bzDecompressEnd)663 5050 y Fj(otherwise)p eop
%%Page: 20 21
20 20 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(20)150 299 y Fe(3.3.6)63
b Fd(BZ2_bzDecompressEnd)390 486 y Fi(int)47 b(BZ2_bzDecompressEnd)42
b(\()48 b(bz_stream)d(*strm)i(\);)150 643 y Fj(Releases)32
b(all)f(memory)f(asso)s(ciated)i(with)e(a)h(decompression)f(stream.)150
799 y(P)m(ossible)i(return)e(v)-5 b(alues:)572 950 y
Fi(BZ_PARAM_ERROR)663 1054 y Fj(if)30 b Fi(strm)f Fj(is)i
Fi(NULL)e Fj(or)i Fi(strm->s)d Fj(is)i Fi(NULL)572 1158
y(BZ_OK)663 1262 y Fj(otherwise)150 1419 y(Allo)m(w)m(able)i(next)f
(actions:)572 1570 y(None.)150 1857 y Fk(3.4)68 b(High-lev)l(el)47
b(in)l(terface)150 2050 y Fj(This)35 b(in)m(terface)i(pro)m(vides)e
(functions)g(for)g(reading)g(and)f(writing)i Fi(bzip2)d
Fj(format)j(\014les.)55 b(First,)37 b(some)150 2159 y(general)31
b(p)s(oin)m(ts.)225 2316 y Fh(\017)60 b Fj(All)35 b(of)g(the)h
(functions)e(tak)m(e)j(an)d Fi(int*)g Fj(\014rst)h(argumen)m(t,)i
Fi(bzerror)p Fj(.)52 b(After)36 b(eac)m(h)f(call,)j Fi(bzerror)330
2426 y Fj(should)23 b(b)s(e)f(consulted)i(\014rst)f(to)i(determine)f
(the)g(outcome)h(of)e(the)h(call.)40 b(If)23 b Fi(bzerror)e
Fj(is)j Fi(BZ_OK)p Fj(,)g(the)330 2535 y(call)35 b(completed)g
(successfully)-8 b(,)36 b(and)d(only)i(then)e(should)h(the)g(return)g
(v)-5 b(alue)34 b(of)g(the)h(function)f(\(if)330 2645
y(an)m(y\))27 b(b)s(e)e(consulted.)40 b(If)26 b Fi(bzerror)f
Fj(is)h Fi(BZ_IO_ERROR)p Fj(,)e(there)j(w)m(as)g(an)e(error)i
(reading/writing)h(the)330 2754 y(underlying)k(compressed)h(\014le,)h
(and)e(y)m(ou)h(should)f(then)h(consult)g Fi(errno)p
Fj(/)p Fi(perror)e Fj(to)i(determine)330 2864 y(the)k(cause)f(of)h(the)
f(di\016cult)m(y)-8 b(.)60 b Fi(bzerror)34 b Fj(ma)m(y)j(also)g(b)s(e)e
(set)i(to)g(v)-5 b(arious)37 b(other)g(v)-5 b(alues;)39
b(precise)330 2974 y(details)31 b(are)g(giv)m(en)g(on)g(a)f(p)s
(er-function)g(basis)g(b)s(elo)m(w.)225 3111 y Fh(\017)60
b Fj(If)39 b Fi(bzerror)e Fj(indicates)i(an)g(error)g(\(ie,)k(an)m
(ything)c(except)h Fi(BZ_OK)d Fj(and)i Fi(BZ_STREAM_END)p
Fj(\),)f(y)m(ou)330 3220 y(should)56 b(immediately)i(call)g
Fi(BZ2_bzReadClose)53 b Fj(\(or)58 b Fi(BZ2_bzWriteClose)p
Fj(,)h(dep)s(ending)d(on)330 3330 y(whether)37 b(y)m(ou)h(are)f
(attempting)i(to)f(read)f(or)h(to)g(write\))g(to)g(free)g(up)e(all)i
(resources)g(asso)s(ciated)330 3439 y(with)44 b(the)g(stream.)83
b(Once)44 b(an)g(error)h(has)e(b)s(een)h(indicated,)k(b)s(eha)m(viour)c
(of)g(all)h(calls)g(except)330 3549 y Fi(BZ2_bzReadClose)h
Fj(\()p Fi(BZ2_bzWriteClose)p Fj(\))h(is)j(unde\014ned.)99
b(The)51 b(implication)g(is)g(that)g(\(1\))330 3659 y
Fi(bzerror)42 b Fj(should)i(b)s(e)f(c)m(hec)m(k)m(ed)k(after)e(eac)m(h)
g(call,)k(and)43 b(\(2\))j(if)e Fi(bzerror)e Fj(indicates)j(an)f
(error,)330 3768 y Fi(BZ2_bzReadClose)26 b Fj(\()p Fi(BZ2_bzWriteClose)
p Fj(\))h(should)i(then)h(b)s(e)g(called)i(to)f(clean)g(up.)225
3905 y Fh(\017)60 b Fj(The)32 b Fi(FILE*)f Fj(argumen)m(ts)i(passed)f
(to)h Fi(BZ2_bzReadOpen)p Fj(/)p Fi(BZ2_bzWriteO)o(pen)26
b Fj(should)31 b(b)s(e)h(set)h(to)330 4015 y(binary)22
b(mo)s(de.)38 b(Most)24 b(Unix)f(systems)g(will)g(do)g(this)g(b)m(y)g
(default,)i(but)d(other)i(platforms,)g(including)330
4124 y(Windo)m(ws)41 b(and)g(Mac,)46 b(will)c(not.)76
b(If)41 b(y)m(ou)i(omit)f(this,)j(y)m(ou)e(ma)m(y)f(encoun)m(ter)h
(problems)e(when)330 4234 y(mo)m(ving)31 b(co)s(de)g(to)g(new)f
(platforms.)225 4371 y Fh(\017)60 b Fj(Memory)45 b(allo)s(cation)h
(requests)f(are)g(handled)e(b)m(y)h Fi(malloc)p Fj(/)p
Fi(free)p Fj(.)80 b(A)m(t)45 b(presen)m(t)g(there)g(is)f(no)330
4481 y(facilit)m(y)39 b(for)f(user-de\014ned)e(memory)h(allo)s(cators)j
(in)d(the)g(\014le)h(I/O)g(functions)f(\(could)g(easily)i(b)s(e)330
4590 y(added,)30 b(though\).)150 4842 y Fe(3.4.1)63 b
Fd(BZ2_bzReadOpen)533 5029 y Fi(typedef)46 b(void)h(BZFILE;)533
5236 y(BZFILE)f(*BZ2_bzReadOpen)e(\()j(int)g(*bzerror,)f(FILE)g(*f,)
1726 5340 y(int)h(small,)f(int)h(verbosity,)p eop
%%Page: 21 22
21 21 bop 150 -116 a Fl(Chapter)30 b(3:)h(Programming)e(with)g
Fi(libbzip2)1891 b Fl(21)1726 299 y Fi(void)47 b(*unused,)f(int)g
(nUnused)g(\);)150 456 y Fj(Prepare)27 b(to)g(read)f(compressed)h(data)
g(from)f(\014le)g(handle)g Fi(f)p Fj(.)39 b Fi(f)26 b
Fj(should)g(refer)g(to)i(a)e(\014le)h(whic)m(h)f(has)g(b)s(een)150
565 y(op)s(ened)i(for)g(reading,)i(and)d(for)i(whic)m(h)f(the)h(error)g
(indicator)h(\()p Fi(ferror\(f\))p Fj(\)is)c(not)j(set.)41
b(If)29 b Fi(small)e Fj(is)h(1,)150 675 y(the)j(library)f(will)h(try)f
(to)i(decompress)e(using)g(less)h(memory)-8 b(,)31 b(at)g(the)f(exp)s
(ense)g(of)h(sp)s(eed.)150 832 y(F)-8 b(or)37 b(reasons)f(explained)h
(b)s(elo)m(w,)h Fi(BZ2_bzRead)33 b Fj(will)k(decompress)f(the)h
Fi(nUnused)d Fj(b)m(ytes)j(starting)g(at)150 941 y Fi(unused)p
Fj(,)j(b)s(efore)f(starting)h(to)g(read)f(from)g(the)h(\014le)f
Fi(f)p Fj(.)67 b(A)m(t)40 b(most)g Fi(BZ_MAX_UNUSED)35
b Fj(b)m(ytes)40 b(ma)m(y)g(b)s(e)150 1051 y(supplied)34
b(lik)m(e)i(this.)54 b(If)34 b(this)h(facilit)m(y)i(is)e(not)g
(required,)h(y)m(ou)f(should)f(pass)g Fi(NULL)f Fj(and)h
Fi(0)h Fj(for)g Fi(unused)150 1160 y Fj(and)30 b(n)p
Fi(Unused)e Fj(resp)s(ectiv)m(ely)-8 b(.)150 1317 y(F)g(or)31
b(the)g(meaning)f(of)h(parameters)g Fi(small)e Fj(and)g
Fi(verbosity)p Fj(,)f(see)j Fi(BZ2_bzDecompressInit)p
Fj(.)150 1474 y(The)i(amoun)m(t)g(of)f(memory)h(needed)g(to)g
(decompress)g(a)g(\014le)g(cannot)g(b)s(e)f(determined)h(un)m(til)g
(the)g(\014le's)150 1584 y(header)h(has)f(b)s(een)g(read.)51
b(So)33 b(it)i(is)e(p)s(ossible)h(that)g Fi(BZ2_bzReadOpen)c
Fj(returns)j Fi(BZ_OK)g Fj(but)g(a)h(subse-)150 1693
y(quen)m(t)d(call)g(of)g Fi(BZ2_bzRead)c Fj(will)k(return)f
Fi(BZ_MEM_ERROR)p Fj(.)150 1850 y(P)m(ossible)i(assignmen)m(ts)e(to)i
Fi(bzerror)p Fj(:)572 2001 y Fi(BZ_CONFIG_ERROR)663 2105
y Fj(if)e(the)h(library)f(has)g(b)s(een)g(mis-compiled)572
2209 y Fi(BZ_PARAM_ERROR)663 2313 y Fj(if)g Fi(f)g Fj(is)h
Fi(NULL)663 2416 y Fj(or)f Fi(small)f Fj(is)i(neither)g
Fi(0)f Fj(nor)g Fi(1)663 2520 y Fj(or)g Fi(\(unused)46
b(==)h(NULL)g(&&)g(nUnused)f(!=)h(0\))663 2624 y Fj(or)30
b Fi(\(unused)46 b(!=)h(NULL)g(&&)g(!\(0)g(<=)g(nUnused)f(<=)h
(BZ_MAX_UNUSED\)\))572 2728 y(BZ_IO_ERROR)663 2831 y
Fj(if)30 b Fi(ferror\(f\))e Fj(is)i(nonzero)572 2935
y Fi(BZ_MEM_ERROR)663 3039 y Fj(if)g(insu\016cien)m(t)h(memory)f(is)h
(a)m(v)-5 b(ailable)572 3143 y Fi(BZ_OK)663 3247 y Fj(otherwise.)150
3403 y(P)m(ossible)32 b(return)e(v)-5 b(alues:)572 3554
y(P)m(oin)m(ter)32 b(to)f(an)f(abstract)i Fi(BZFILE)663
3658 y Fj(if)e Fi(bzerror)e Fj(is)j Fi(BZ_OK)572 3762
y(NULL)663 3866 y Fj(otherwise)150 4023 y(Allo)m(w)m(able)h(next)f
(actions:)572 4174 y Fi(BZ2_bzRead)663 4277 y Fj(if)f
Fi(bzerror)e Fj(is)j Fi(BZ_OK)572 4381 y(BZ2_bzClose)663
4485 y Fj(otherwise)150 4887 y Fe(3.4.2)63 b Fd(BZ2_bzRead)533
5074 y Fi(int)47 b(BZ2_bzRead)e(\()j(int)e(*bzerror,)g(BZFILE)g(*b,)h
(void)f(*buf,)h(int)g(len)g(\);)150 5230 y Fj(Reads)33
b(up)e(to)j Fi(len)d Fj(\(uncompressed\))i(b)m(ytes)g(from)f(the)h
(compressed)g(\014le)g Fi(b)f Fj(in)m(to)i(the)f(bu\013er)f
Fi(buf)p Fj(.)46 b(If)150 5340 y(the)28 b(read)f(w)m(as)h(successful,)g
Fi(bzerror)d Fj(is)j(set)g(to)g Fi(BZ_OK)f Fj(and)f(the)i(n)m(um)m(b)s
(er)e(of)i(b)m(ytes)g(read)g(is)f(returned.)p eop
%%Page: 22 23
22 22 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(22)150 299 y Fj(If)32
b(the)g(logical)i(end-of-stream)e(w)m(as)g(detected,)i
Fi(bzerror)c Fj(will)i(b)s(e)g(set)g(to)h Fi(BZ_STREAM_END)p
Fj(,)c(and)i(the)150 408 y(n)m(um)m(b)s(er)e(of)i(b)m(ytes)g(read)f(is)
h(returned.)40 b(All)30 b(other)h Fi(bzerror)e Fj(v)-5
b(alues)30 b(denote)h(an)f(error.)150 565 y Fi(BZ2_bzRead)k
Fj(will)k(supply)e Fi(len)g Fj(b)m(ytes,)k(unless)d(the)g(logical)j
(stream)d(end)g(is)g(detected)i(or)f(an)e(error)150 675
y(o)s(ccurs.)70 b(Because)40 b(of)g(this,)j(it)e(is)f(p)s(ossible)f(to)
i(detect)h(the)e(stream)h(end)e(b)m(y)h(observing)h(when)e(the)150
784 y(n)m(um)m(b)s(er)24 b(of)h(b)m(ytes)h(returned)e(is)h(less)h(than)
e(the)i(n)m(um)m(b)s(er)e(requested.)39 b(Nev)m(ertheless,)29
b(this)c(is)g(regarded)150 894 y(as)37 b(inadvisable;)i(y)m(ou)e
(should)f(instead)h(c)m(hec)m(k)h Fi(bzerror)c Fj(after)k(ev)m(ery)f
(call)h(and)e(w)m(atc)m(h)h(out)g(for)g Fi(BZ_)150 1004
y(STREAM_END)p Fj(.)150 1160 y(In)m(ternally)-8 b(,)47
b Fi(BZ2_bzRead)39 b Fj(copies)k(data)f(from)g(the)g(compressed)g
(\014le)g(in)g(c)m(h)m(unks)g(of)g(size)h Fi(BZ_MAX_)150
1270 y(UNUSED)28 b Fj(b)m(ytes)j(b)s(efore)e(decompressing)h(it.)41
b(If)30 b(the)g(\014le)g(con)m(tains)h(more)f(b)m(ytes)h(than)e
(strictly)i(needed)150 1380 y(to)46 b(reac)m(h)g(the)f(logical)i
(end-of-stream,)j Fi(BZ2_bzRead)42 b Fj(will)j(almost)h(certainly)g
(read)f(some)g(of)h(the)150 1489 y(trailing)f(data)g(b)s(efore)f
(signalling)h Fi(BZ_SEQUENCE_END)p Fj(.)78 b(T)-8 b(o)45
b(collect)i(the)d(read)g(but)g(un)m(used)f(data)150 1599
y(once)27 b Fi(BZ_SEQUENCE_END)22 b Fj(has)k(app)s(eared,)g(call)h
Fi(BZ2_bzReadGetUnused)21 b Fj(immediately)28 b(b)s(efore)e
Fi(BZ2_)150 1708 y(bzReadClose)p Fj(.)150 1865 y(P)m(ossible)32
b(assignmen)m(ts)e(to)i Fi(bzerror)p Fj(:)572 2016 y
Fi(BZ_PARAM_ERROR)663 2120 y Fj(if)e Fi(b)g Fj(is)h Fi(NULL)e
Fj(or)h Fi(buf)g Fj(is)g Fi(NULL)f Fj(or)i Fi(len)47
b(<)g(0)572 2224 y(BZ_SEQUENCE_ERROR)663 2328 y Fj(if)30
b Fi(b)g Fj(w)m(as)h(op)s(ened)e(with)h Fi(BZ2_bzWriteOpen)572
2431 y(BZ_IO_ERROR)663 2535 y Fj(if)g(there)h(is)f(an)g(error)h
(reading)g(from)f(the)h(compressed)f(\014le)572 2639
y Fi(BZ_UNEXPECTED_EOF)663 2743 y Fj(if)g(the)h(compressed)f(\014le)h
(ended)e(b)s(efore)i(the)f(logical)j(end-of-stream)e(w)m(as)g(detected)
572 2847 y Fi(BZ_DATA_ERROR)663 2950 y Fj(if)f(a)h(data)f(in)m(tegrit)m
(y)j(error)e(w)m(as)g(detected)g(in)g(the)f(compressed)h(stream)572
3054 y Fi(BZ_DATA_ERROR_MAGIC)663 3158 y Fj(if)f(the)h(stream)g(do)s
(es)f(not)g(b)s(egin)g(with)h(the)f(requisite)i(header)e(b)m(ytes)h
(\(ie,)h(is)e(not)663 3262 y(a)g Fi(bzip2)f Fj(data)i(\014le\).)61
b(This)30 b(is)h(really)g(a)f(sp)s(ecial)h(case)g(of)g
Fi(BZ_DATA_ERROR)p Fj(.)572 3365 y Fi(BZ_MEM_ERROR)663
3469 y Fj(if)f(insu\016cien)m(t)h(memory)f(w)m(as)h(a)m(v)-5
b(ailable)572 3573 y Fi(BZ_STREAM_END)663 3677 y Fj(if)30
b(the)h(logical)h(end)e(of)h(stream)g(w)m(as)f(detected.)572
3781 y Fi(BZ_OK)663 3884 y Fj(otherwise.)150 4041 y(P)m(ossible)i
(return)e(v)-5 b(alues:)572 4192 y(n)m(um)m(b)s(er)29
b(of)i(b)m(ytes)g(read)663 4296 y(if)f Fi(bzerror)e Fj(is)j
Fi(BZ_OK)e Fj(or)h Fi(BZ_STREAM_END)572 4400 y Fj(unde\014ned)663
4503 y(otherwise)150 4660 y(Allo)m(w)m(able)i(next)f(actions:)572
4811 y(collect)i(data)d(from)h Fi(buf)p Fj(,)e(then)i
Fi(BZ2_bzRead)c Fj(or)k Fi(BZ2_bzReadClose)663 4915 y
Fj(if)f Fi(bzerror)e Fj(is)j Fi(BZ_OK)572 5019 y Fj(collect)i(data)d
(from)h Fi(buf)p Fj(,)e(then)i Fi(BZ2_bzReadClose)26
b Fj(or)k Fi(BZ2_bzReadGetUnused)663 5123 y Fj(if)g Fi(bzerror)e
Fj(is)j Fi(BZ_SEQUENCE_END)572 5226 y(BZ2_bzReadClose)663
5330 y Fj(otherwise)p eop
%%Page: 23 24
23 23 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(23)150 299 y Fe(3.4.3)63
b Fd(BZ2_bzReadGetUnused)533 486 y Fi(void)47 b(BZ2_bzReadGetUnused)42
b(\()48 b(int*)e(bzerror,)g(BZFILE)g(*b,)1822 589 y(void**)g(unused,)g
(int*)g(nUnused)g(\);)150 746 y Fj(Returns)35 b(data)g(whic)m(h)f(w)m
(as)i(read)e(from)h(the)g(compressed)g(\014le)g(but)g(w)m(as)g(not)g
(needed)g(to)h(get)g(to)g(the)150 856 y(logical)44 b(end-of-stream.)76
b Fi(*unused)39 b Fj(is)j(set)h(to)f(the)g(address)f(of)h(the)g(data,)k
(and)40 b Fi(*nUnused)g Fj(to)j(the)150 965 y(n)m(um)m(b)s(er)28
b(of)h(b)m(ytes.)41 b Fi(*nUnused)27 b Fj(will)i(b)s(e)g(set)g(to)h(a)f
(v)-5 b(alue)30 b(b)s(et)m(w)m(een)g Fi(0)e Fj(and)g
Fi(BZ_MAX_UNUSED)e Fj(inclusiv)m(e.)150 1122 y(This)f(function)g(ma)m
(y)h(only)f(b)s(e)g(called)h(once)g Fi(BZ2_bzRead)d Fj(has)i(signalled)
h Fi(BZ_STREAM_END)21 b Fj(but)k(b)s(efore)150 1232 y
Fi(BZ2_bzReadClose)p Fj(.)150 1389 y(P)m(ossible)32 b(assignmen)m(ts)e
(to)i Fi(bzerror)p Fj(:)572 1540 y Fi(BZ_PARAM_ERROR)663
1644 y Fj(if)e Fi(b)g Fj(is)h Fi(NULL)663 1747 y Fj(or)f
Fi(unused)f Fj(is)h Fi(NULL)g Fj(or)g Fi(nUnused)f Fj(is)h
Fi(NULL)572 1851 y(BZ_SEQUENCE_ERROR)663 1955 y Fj(if)g
Fi(BZ_STREAM_END)d Fj(has)j(not)g(b)s(een)g(signalled)663
2059 y(or)g(if)h Fi(b)f Fj(w)m(as)g(op)s(ened)g(with)g
Fi(BZ2_bzWriteOpen)542 2162 y(BZ_OK)663 2266 y Fj(otherwise)150
2423 y(Allo)m(w)m(able)i(next)f(actions:)572 2574 y Fi(BZ2_bzReadClose)
150 2882 y Fe(3.4.4)63 b Fd(BZ2_bzReadClose)533 3068
y Fi(void)47 b(BZ2_bzReadClose)c(\()48 b(int)f(*bzerror,)e(BZFILE)h(*b)
h(\);)150 3225 y Fj(Releases)35 b(all)e(memory)h(p)s(ertaining)f(to)h
(the)f(compressed)h(\014le)f Fi(b)p Fj(.)49 b Fi(BZ2_bzReadClose)29
b Fj(do)s(es)j(not)i(call)150 3335 y Fi(fclose)d Fj(on)h(the)g
(underlying)g(\014le)g(handle,)h(so)f(y)m(ou)h(should)e(do)h(that)h(y)m
(ourself)g(if)f(appropriate.)47 b Fi(BZ2_)150 3445 y(bzReadClose)27
b Fj(should)j(b)s(e)f(called)j(to)f(clean)g(up)e(after)i(all)g(error)g
(situations.)150 3601 y(P)m(ossible)h(assignmen)m(ts)e(to)i
Fi(bzerror)p Fj(:)572 3752 y Fi(BZ_SEQUENCE_ERROR)663
3856 y Fj(if)e Fi(b)g Fj(w)m(as)h(op)s(ened)e(with)h
Fi(BZ2_bzOpenWrite)572 3960 y(BZ_OK)663 4064 y Fj(otherwise)150
4221 y(Allo)m(w)m(able)i(next)f(actions:)572 4372 y(none)150
4679 y Fe(3.4.5)63 b Fd(BZ2_bzWriteOpen)533 4866 y Fi(BZFILE)46
b(*BZ2_bzWriteOpen)e(\()j(int)g(*bzerror,)e(FILE)i(*f,)1774
4970 y(int)g(blockSize100k,)d(int)j(verbosity,)1774 5074
y(int)g(workFactor)e(\);)150 5230 y Fj(Prepare)31 b(to)h(write)g
(compressed)f(data)g(to)h(\014le)f(handle)f Fi(f)p Fj(.)42
b Fi(f)30 b Fj(should)g(refer)i(to)f(a)h(\014le)f(whic)m(h)f(has)h(b)s
(een)150 5340 y(op)s(ened)f(for)g(writing,)h(and)f(for)g(whic)m(h)g
(the)h(error)g(indicator)g(\()p Fi(ferror\(f\))p Fj(\)is)e(not)h(set.)p
eop
%%Page: 24 25
24 24 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(24)150 299 y Fj(F)-8 b(or)31
b(the)g(meaning)f(of)h(parameters)g Fi(blockSize100k)p
Fj(,)c Fi(verbosity)h Fj(and)h Fi(workFactor)p Fj(,)f(see)150
408 y Fi(BZ2_bzCompressInit)p Fj(.)150 565 y(All)38 b(required)g
(memory)g(is)g(allo)s(cated)i(at)e(this)h(stage,)i(so)d(if)g(the)h
(call)g(completes)g(successfully)-8 b(,)41 b Fi(BZ_)150
675 y(MEM_ERROR)28 b Fj(cannot)j(b)s(e)e(signalled)i(b)m(y)g(a)f
(subsequen)m(t)g(call)h(to)h Fi(BZ2_bzWrite)p Fj(.)150
832 y(P)m(ossible)g(assignmen)m(ts)e(to)i Fi(bzerror)p
Fj(:)572 983 y Fi(BZ_CONFIG_ERROR)663 1087 y Fj(if)e(the)h(library)f
(has)g(b)s(een)g(mis-compiled)572 1190 y Fi(BZ_PARAM_ERROR)663
1294 y Fj(if)g Fi(f)g Fj(is)h Fi(NULL)663 1398 y Fj(or)f
Fi(blockSize100k)45 b(<)i(1)30 b Fj(or)h Fi(blockSize100k)44
b(>)j(9)572 1502 y(BZ_IO_ERROR)663 1605 y Fj(if)30 b
Fi(ferror\(f\))e Fj(is)i(nonzero)572 1709 y Fi(BZ_MEM_ERROR)663
1813 y Fj(if)g(insu\016cien)m(t)h(memory)f(is)h(a)m(v)-5
b(ailable)572 1917 y Fi(BZ_OK)663 2021 y Fj(otherwise)150
2177 y(P)m(ossible)32 b(return)e(v)-5 b(alues:)572 2328
y(P)m(oin)m(ter)32 b(to)f(an)f(abstract)i Fi(BZFILE)663
2432 y Fj(if)e Fi(bzerror)e Fj(is)j Fi(BZ_OK)572 2536
y(NULL)663 2640 y Fj(otherwise)150 2797 y(Allo)m(w)m(able)h(next)f
(actions:)572 2948 y Fi(BZ2_bzWrite)663 3051 y Fj(if)f
Fi(bzerror)e Fj(is)j Fi(BZ_OK)597 3155 y Fj(\(y)m(ou)24
b(could)f(go)h(directly)g(to)g Fi(BZ2_bzWriteClose)p
Fj(,)19 b(but)j(this)h(w)m(ould)g(b)s(e)g(prett)m(y)h(p)s(oin)m
(tless\))572 3259 y Fi(BZ2_bzWriteClose)663 3363 y Fj(otherwise)150
3852 y Fe(3.4.6)63 b Fd(BZ2_bzWrite)533 4039 y Fi(void)47
b(BZ2_bzWrite)e(\()i(int)g(*bzerror,)e(BZFILE)h(*b,)h(void)g(*buf,)f
(int)h(len)g(\);)150 4196 y Fj(Absorbs)35 b Fi(len)h
Fj(b)m(ytes)h(from)f(the)h(bu\013er)f Fi(buf)p Fj(,)h(ev)m(en)m(tually)
i(to)e(b)s(e)f(compressed)g(and)g(written)h(to)h(the)150
4306 y(\014le.)150 4463 y(P)m(ossible)32 b(assignmen)m(ts)e(to)i
Fi(bzerror)p Fj(:)572 4614 y Fi(BZ_PARAM_ERROR)663 4717
y Fj(if)e Fi(b)g Fj(is)h Fi(NULL)e Fj(or)h Fi(buf)g Fj(is)g
Fi(NULL)f Fj(or)i Fi(len)47 b(<)g(0)572 4821 y(BZ_SEQUENCE_ERROR)663
4925 y Fj(if)30 b(b)g(w)m(as)g(op)s(ened)g(with)g Fi(BZ2_bzReadOpen)572
5029 y(BZ_IO_ERROR)663 5132 y Fj(if)g(there)h(is)f(an)g(error)h
(writing)g(the)g(compressed)f(\014le.)572 5236 y Fi(BZ_OK)663
5340 y Fj(otherwise)p eop
%%Page: 25 26
25 25 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(25)150 299 y Fe(3.4.7)63
b Fd(BZ2_bzWriteClose)533 486 y Fi(void)47 b(BZ2_bzWriteClose)c(\()48
b(int)f(*bzerror,)e(BZFILE*)h(f,)1679 589 y(int)h(abandon,)1679
693 y(unsigned)e(int*)i(nbytes_in,)1679 797 y(unsigned)e(int*)i
(nbytes_out)e(\);)533 1005 y(void)i(BZ2_bzWriteClose64)c(\()k(int)g
(*bzerror,)e(BZFILE*)h(f,)1774 1108 y(int)h(abandon,)1774
1212 y(unsigned)f(int*)g(nbytes_in_lo32,)1774 1316 y(unsigned)g(int*)g
(nbytes_in_hi32,)1774 1420 y(unsigned)g(int*)g(nbytes_out_lo32,)1774
1523 y(unsigned)g(int*)g(nbytes_out_hi32)e(\);)150 1680
y Fj(Compresses)38 b(and)f(\015ushes)g(to)i(the)g(compressed)f(\014le)h
(all)f(data)h(so)g(far)f(supplied)f(b)m(y)h Fi(BZ2_bzWrite)p
Fj(.)150 1790 y(The)h(logical)i(end-of-stream)e(mark)m(ers)h(are)f
(also)g(written,)j(so)d(subsequen)m(t)g(calls)g(to)h
Fi(BZ2_bzWrite)150 1899 y Fj(are)31 b(illegal.)45 b(All)31
b(memory)g(asso)s(ciated)h(with)f(the)g(compressed)g(\014le)h
Fi(b)e Fj(is)h(released.)44 b Fi(fflush)29 b Fj(is)i(called)150
2009 y(on)f(the)h(compressed)f(\014le,)h(but)f(it)h(is)f(not)h
Fi(fclose)p Fj('d.)150 2166 y(If)g Fi(BZ2_bzWriteClose)d
Fj(is)j(called)i(to)f(clean)g(up)f(after)h(an)f(error,)i(the)f(only)g
(action)h(is)e(to)i(release)g(the)150 2275 y(memory)-8
b(.)40 b(The)28 b(library)g(records)g(the)g(error)g(co)s(des)g(issued)f
(b)m(y)g(previous)h(calls,)h(so)f(this)g(situation)h(will)150
2385 y(b)s(e)37 b(detected)i(automatically)-8 b(.)64
b(There)38 b(is)f(no)h(attempt)g(to)h(complete)g(the)e(compression)h
(op)s(eration,)150 2495 y(nor)f(to)h Fi(fflush)e Fj(the)h(compressed)g
(\014le.)62 b(Y)-8 b(ou)37 b(can)g(force)h(this)g(b)s(eha)m(viour)e(to)
i(happ)s(en)e(ev)m(en)i(in)f(the)150 2604 y(case)31 b(of)g(no)f(error,)
h(b)m(y)f(passing)g(a)h(nonzero)g(v)-5 b(alue)30 b(to)i
Fi(abandon)p Fj(.)150 2761 y(If)h Fi(nbytes_in)d Fj(is)j(non-n)m(ull,)g
Fi(*nbytes_in)d Fj(will)j(b)s(e)f(set)i(to)f(b)s(e)g(the)g(total)h(v)m
(olume)g(of)f(uncompressed)150 2871 y(data)k(handled.)58
b(Similarly)-8 b(,)38 b Fi(nbytes_out)c Fj(will)j(b)s(e)f(set)h(to)g
(the)g(total)h(v)m(olume)g(of)e(compressed)h(data)150
2980 y(written.)i(F)-8 b(or)24 b(compatibilit)m(y)i(with)d(older)h(v)m
(ersions)g(of)g(the)g(library)-8 b(,)25 b Fi(BZ2_bzWriteClose)19
b Fj(only)24 b(yields)150 3090 y(the)39 b(lo)m(w)m(er)i(32)e(bits)g(of)
g(these)g(coun)m(ts.)67 b(Use)39 b Fi(BZ2_bzWriteClose64)34
b Fj(if)39 b(y)m(ou)g(w)m(an)m(t)g(the)h(full)e(64)i(bit)150
3199 y(coun)m(ts.)h(These)31 b(t)m(w)m(o)h(functions)e(are)h(otherwise)
g(absolutely)g(iden)m(tical.)150 3356 y(P)m(ossible)h(assignmen)m(ts)e
(to)i Fi(bzerror)p Fj(:)572 3507 y Fi(BZ_SEQUENCE_ERROR)663
3611 y Fj(if)e Fi(b)g Fj(w)m(as)h(op)s(ened)e(with)h
Fi(BZ2_bzReadOpen)572 3715 y(BZ_IO_ERROR)663 3819 y Fj(if)g(there)h(is)
f(an)g(error)h(writing)g(the)g(compressed)f(\014le)572
3922 y Fi(BZ_OK)663 4026 y Fj(otherwise)150 4296 y Fe(3.4.8)63
b(Handling)41 b(em)m(b)s(edded)g(compressed)h(data)e(streams)150
4489 y Fj(The)i(high-lev)m(el)h(library)e(facilitates)k(use)c(of)h
Fi(bzip2)e Fj(data)i(streams)g(whic)m(h)f(form)g(some)h(part)g(of)g(a)
150 4598 y(surrounding,)29 b(larger)i(data)g(stream.)225
4755 y Fh(\017)60 b Fj(F)-8 b(or)49 b(writing,)k(the)c(library)f(tak)m
(es)i(an)e(op)s(en)f(\014le)i(handle,)j(writes)d(compressed)f(data)h
(to)g(it,)330 4865 y Fi(fflush)p Fj(es)37 b(it)h(but)f(do)s(es)h(not)g
Fi(fclose)f Fj(it.)64 b(The)38 b(calling)h(application)g(can)f(write)g
(its)h(o)m(wn)f(data)330 4974 y(b)s(efore)30 b(and)g(after)h(the)g
(compressed)f(data)h(stream,)g(using)f(that)h(same)f(\014le)h(handle.)
225 5121 y Fh(\017)60 b Fj(Reading)33 b(is)g(more)g(complex,)h(and)e
(the)h(facilities)i(are)e(not)g(as)g(general)h(as)f(they)g(could)f(b)s
(e)h(since)330 5230 y(generalit)m(y)e(is)d(hard)g(to)h(reconcile)i
(with)d(e\016ciency)-8 b(.)42 b Fi(BZ2_bzRead)25 b Fj(reads)k(from)f
(the)h(compressed)330 5340 y(\014le)39 b(in)g(blo)s(c)m(ks)g(of)h(size)
f Fi(BZ_MAX_UNUSED)d Fj(b)m(ytes,)42 b(and)c(in)h(doing)g(so)g
(probably)g(will)g(o)m(v)m(ersho)s(ot)p eop
%%Page: 26 27
26 26 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(26)330 299 y Fj(the)37
b(logical)i(end)e(of)g(compressed)g(stream.)60 b(T)-8
b(o)38 b(reco)m(v)m(er)i(this)c(data)i(once)f(decompression)g(has)330
408 y(ended,)27 b(call)h Fi(BZ2_bzReadGetUnused)21 b
Fj(after)27 b(the)g(last)h(call)f(of)g Fi(BZ2_bzRead)d
Fj(\(the)j(one)g(returning)330 518 y Fi(BZ_STREAM_END)p
Fj(\))g(but)j(b)s(efore)g(calling)i Fi(BZ2_bzReadClose)p
Fj(.)150 702 y(This)j(mec)m(hanism)h(mak)m(es)g(it)h(easy)f(to)g
(decompress)g(m)m(ultiple)g Fi(bzip2)e Fj(streams)i(placed)g
(end-to-end.)150 812 y(As)67 b(the)h(end)g(of)f(one)i(stream,)77
b(when)67 b Fi(BZ2_bzRead)e Fj(returns)j Fi(BZ_STREAM_END)p
Fj(,)73 b(call)c Fi(BZ2_)150 921 y(bzReadGetUnused)34
b Fj(to)40 b(collect)h(the)e(un)m(used)e(data)i(\(cop)m(y)g(it)g(in)m
(to)h(y)m(our)f(o)m(wn)f(bu\013er)g(somewhere\).)150
1031 y(That)52 b(data)h(forms)f(the)g(start)h(of)f(the)h(next)f
(compressed)g(stream.)107 b(T)-8 b(o)53 b(start)g(uncompressing)150
1140 y(that)61 b(next)f(stream,)68 b(call)62 b Fi(BZ2_bzReadOpen)56
b Fj(again,)68 b(feeding)61 b(in)e(the)i(un)m(used)e(data)h(via)h(the)
150 1250 y Fi(unused)p Fj(/)p Fi(nUnused)28 b Fj(parameters.)45
b(Keep)32 b(doing)f(this)h(un)m(til)g Fi(BZ_STREAM_END)c
Fj(return)j(coincides)h(with)150 1360 y(the)j(ph)m(ysical)g(end)f(of)h
(\014le)f(\()p Fi(feof\(f\))p Fj(\).)52 b(In)34 b(this)h(situation)g
Fi(BZ2_bzReadGetUnused)30 b Fj(will)35 b(of)f(course)150
1469 y(return)c(no)g(data.)150 1626 y(This)24 b(should)g(giv)m(e)i
(some)f(feel)h(for)f(ho)m(w)g(the)g(high-lev)m(el)h(in)m(terface)h(can)
d(b)s(e)g(used.)38 b(If)25 b(y)m(ou)g(require)g(extra)150
1736 y(\015exibilit)m(y)-8 b(,)32 b(y)m(ou'll)g(ha)m(v)m(e)f(to)g(bite)
g(the)g(bullet)g(and)e(get)j(to)f(grips)f(with)h(the)f(lo)m(w-lev)m(el)
k(in)m(terface.)150 1987 y Fe(3.4.9)63 b(Standard)40
b(\014le-reading/writing)j(co)s(de)150 2179 y Fj(Here's)31
b(ho)m(w)g(y)m(ou'd)f(write)h(data)g(to)g(a)g(compressed)f(\014le:)390
2538 y Fi(FILE*)142 b(f;)390 2642 y(BZFILE*)46 b(b;)390
2746 y(int)238 b(nBuf;)390 2849 y(char)190 b(buf[)46
b(/*)i(whatever)d(size)i(you)g(like)f(*/)i(];)390 2953
y(int)238 b(bzerror;)390 3057 y(int)g(nWritten;)390 3264
y(f)47 b(=)h(fopen)e(\()i("myfile.bz2",)c("w")j(\);)390
3368 y(if)g(\(!f\))g({)533 3472 y(/*)g(handle)f(error)h(*/)390
3576 y(})390 3680 y(b)g(=)h(BZ2_bzWriteOpen)c(\()j(&bzerror,)e(f,)i(9)h
(\);)390 3783 y(if)f(\(bzerror)f(!=)h(BZ_OK\))f({)533
3887 y(BZ2_bzWriteClose)e(\()j(b)g(\);)533 3991 y(/*)g(handle)f(error)h
(*/)390 4095 y(})390 4302 y(while)f(\()i(/*)f(condition)e(*/)i(\))h({)
533 4406 y(/*)f(get)g(data)g(to)g(write)f(into)h(buf,)g(and)g(set)g
(nBuf)f(appropriately)e(*/)533 4510 y(nWritten)i(=)h(BZ2_bzWrite)e(\()i
(&bzerror,)f(b,)h(buf,)f(nBuf)h(\);)533 4614 y(if)g(\(bzerror)f(==)h
(BZ_IO_ERROR\))e({)676 4717 y(BZ2_bzWriteClose)f(\()j(&bzerror,)e(b)j
(\);)676 4821 y(/*)g(handle)e(error)g(*/)533 4925 y(})390
5029 y(})390 5236 y(BZ2_bzWriteClose)d(\()48 b(&bzerror,)d(b)j(\);)390
5340 y(if)f(\(bzerror)f(==)h(BZ_IO_ERROR\))d({)p eop
%%Page: 27 28
27 27 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(27)533 299 y Fi(/*)47
b(handle)f(error)h(*/)390 403 y(})150 559 y Fj(And)29
b(to)i(read)g(from)f(a)g(compressed)h(\014le:)390 711
y Fi(FILE*)142 b(f;)390 814 y(BZFILE*)46 b(b;)390 918
y(int)238 b(nBuf;)390 1022 y(char)190 b(buf[)46 b(/*)i(whatever)d(size)
i(you)g(like)f(*/)i(];)390 1126 y(int)238 b(bzerror;)390
1229 y(int)g(nWritten;)390 1437 y(f)47 b(=)h(fopen)e(\()i
("myfile.bz2",)c("r")j(\);)390 1541 y(if)g(\(!f\))g({)533
1645 y(/*)g(handle)f(error)h(*/)390 1748 y(})390 1852
y(b)g(=)h(BZ2_bzReadOpen)c(\()j(&bzerror,)f(f,)h(0,)g(NULL,)f(0)i(\);)
390 1956 y(if)f(\(bzerror)f(!=)h(BZ_OK\))f({)533 2060
y(BZ2_bzReadClose)e(\()j(&bzerror,)f(b)h(\);)533 2163
y(/*)g(handle)f(error)h(*/)390 2267 y(})390 2475 y(bzerror)f(=)h
(BZ_OK;)390 2579 y(while)f(\(bzerror)g(==)h(BZ_OK)f(&&)i(/*)f
(arbitrary)e(other)h(conditions)f(*/\))i({)533 2682 y(nBuf)g(=)g
(BZ2_bzRead)e(\()j(&bzerror,)d(b,)i(buf,)g(/*)g(size)g(of)g(buf)g(*/)g
(\);)533 2786 y(if)g(\(bzerror)f(==)h(BZ_OK\))f({)676
2890 y(/*)i(do)f(something)e(with)i(buf[0)f(..)h(nBuf-1])f(*/)533
2994 y(})390 3097 y(})390 3201 y(if)h(\(bzerror)f(!=)h(BZ_STREAM_END\))
d({)533 3305 y(BZ2_bzReadClose)g(\()j(&bzerror,)f(b)h(\);)533
3409 y(/*)g(handle)f(error)h(*/)390 3513 y(})g(else)g({)533
3616 y(BZ2_bzReadClose)d(\()j(&bzerror)f(\);)390 3720
y(})150 3991 y Fk(3.5)68 b(Utilit)l(y)47 b(functions)150
4264 y Fe(3.5.1)63 b Fd(BZ2_bzBuffToBuffCompress)533
4451 y Fi(int)47 b(BZ2_bzBuffToBuffCompress\()41 b(char*)428
b(dest,)1965 4555 y(unsigned)46 b(int*)g(destLen,)1965
4658 y(char*)428 b(source,)1965 4762 y(unsigned)46 b(int)94
b(sourceLen,)1965 4866 y(int)524 b(blockSize100k,)1965
4970 y(int)g(verbosity,)1965 5074 y(int)g(workFactor)45
b(\);)150 5230 y Fj(A)m(ttempts)32 b(to)f(compress)f(the)h(data)g(in)f
Fi(source[0)e(..)i(sourceLen-1])d Fj(in)m(to)k(the)g(destination)g
(bu\013er,)150 5340 y Fi(dest[0)e(..)g(*destLen-1])p
Fj(.)36 b(If)25 b(the)g(destination)h(bu\013er)e(is)h(big)f(enough,)i
Fi(*destLen)d Fj(is)i(set)g(to)h(the)f(size)p eop
%%Page: 28 29
28 28 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(28)150 299 y Fj(of)27
b(the)f(compressed)h(data,)h(and)d Fi(BZ_OK)g Fj(is)i(returned.)38
b(If)27 b(the)f(compressed)h(data)g(w)m(on't)g(\014t,)g
Fi(*destLen)150 408 y Fj(is)j(unc)m(hanged,)g(and)g Fi(BZ_OUTBUFF_FULL)
c Fj(is)31 b(returned.)150 565 y(Compression)22 b(in)h(this)f(manner)g
(is)h(a)f(one-shot)i(ev)m(en)m(t,)i(done)d(with)f(a)h(single)g(call)h
(to)f(this)g(function.)38 b(The)150 675 y(resulting)26
b(compressed)g(data)f(is)h(a)g(complete)h Fi(bzip2)d
Fj(format)i(data)g(stream.)39 b(There)26 b(is)f(no)h(mec)m(hanism)150
784 y(for)d(making)g(additional)h(calls)f(to)h(pro)m(vide)g(extra)f
(input)g(data.)38 b(If)23 b(y)m(ou)g(w)m(an)m(t)h(that)f(kind)f(of)i
(mec)m(hanism,)150 894 y(use)30 b(the)h(lo)m(w-lev)m(el)i(in)m
(terface.)150 1051 y(F)-8 b(or)31 b(the)g(meaning)f(of)h(parameters)g
Fi(blockSize100k)p Fj(,)c Fi(verbosity)h Fj(and)h Fi(workFactor)p
Fj(,)150 1160 y(see)i Fi(BZ2_bzCompressInit)p Fj(.)150
1317 y(T)-8 b(o)37 b(guaran)m(tee)h(that)f(the)f(compressed)h(data)f
(will)h(\014t)f(in)g(its)h(bu\013er,)g(allo)s(cate)h(an)e(output)g
(bu\013er)g(of)150 1427 y(size)31 b(1\045)g(larger)g(than)f(the)h
(uncompressed)e(data,)i(plus)f(six)g(h)m(undred)f(extra)i(b)m(ytes.)150
1584 y Fi(BZ2_bzBuffToBuffDecompre)o(ss)24 b Fj(will)31
b(not)g(write)g(data)f(at)h(or)g(b)s(ey)m(ond)e Fi(dest[*destLen])p
Fj(,)e(ev)m(en)k(in)150 1693 y(case)g(of)g(bu\013er)e(o)m(v)m(er\015o)m
(w.)150 1850 y(P)m(ossible)j(return)e(v)-5 b(alues:)572
2001 y Fi(BZ_CONFIG_ERROR)663 2105 y Fj(if)30 b(the)h(library)f(has)g
(b)s(een)g(mis-compiled)572 2209 y Fi(BZ_PARAM_ERROR)663
2313 y Fj(if)g Fi(dest)f Fj(is)i Fi(NULL)e Fj(or)i Fi(destLen)d
Fj(is)i Fi(NULL)663 2416 y Fj(or)g Fi(blockSize100k)45
b(<)i(1)30 b Fj(or)h Fi(blockSize100k)44 b(>)j(9)663
2520 y Fj(or)30 b Fi(verbosity)46 b(<)h(0)30 b Fj(or)h
Fi(verbosity)45 b(>)i(4)663 2624 y Fj(or)30 b Fi(workFactor)45
b(<)j(0)30 b Fj(or)g Fi(workFactor)45 b(>)j(250)572 2728
y(BZ_MEM_ERROR)663 2831 y Fj(if)30 b(insu\016cien)m(t)h(memory)f(is)h
(a)m(v)-5 b(ailable)572 2935 y Fi(BZ_OUTBUFF_FULL)663
3039 y Fj(if)30 b(the)h(size)g(of)g(the)f(compressed)h(data)f(exceeds)i
Fi(*destLen)572 3143 y(BZ_OK)663 3247 y Fj(otherwise)150
3616 y Fe(3.5.2)63 b Fd(BZ2_bzBuffToBuffDecompress)533
3803 y Fi(int)47 b(BZ2_bzBuffToBuffDecompres)o(s)42 b(\()47
b(char*)428 b(dest,)2108 3906 y(unsigned)46 b(int*)g(destLen,)2108
4010 y(char*)428 b(source,)2108 4114 y(unsigned)46 b(int)94
b(sourceLen,)2108 4218 y(int)524 b(small,)2108 4322 y(int)g(verbosity)
46 b(\);)150 4478 y Fj(A)m(ttempts)22 b(to)g(decompress)f(the)h(data)f
(in)g Fi(source[0)28 b(..)i(sourceLen-1])18 b Fj(in)m(to)k(the)f
(destination)h(bu\013er,)150 4588 y Fi(dest[0)29 b(..)g(*destLen-1])p
Fj(.)61 b(If)37 b(the)h(destination)h(bu\013er)e(is)h(big)g(enough,)i
Fi(*destLen)35 b Fj(is)j(set)h(to)g(the)150 4698 y(size)e(of)e(the)h
(uncompressed)f(data,)j(and)c Fi(BZ_OK)h Fj(is)g(returned.)56
b(If)36 b(the)g(compressed)f(data)h(w)m(on't)h(\014t,)150
4807 y Fi(*destLen)28 b Fj(is)j(unc)m(hanged,)f(and)f
Fi(BZ_OUTBUFF_FULL)d Fj(is)31 b(returned.)150 4964 y
Fi(source)e Fj(is)h(assumed)f(to)j(hold)e(a)g(complete)i
Fi(bzip2)d Fj(format)i(data)g(stream.)150 5074 y Fi
(BZ2_bzBuffToBuffDecompre)o(ss)38 b Fj(tries)46 b(to)f(decompress)f
(the)h(en)m(tiret)m(y)i(of)d(the)h(stream)g(in)m(to)h(the)150
5183 y(output)30 b(bu\013er.)150 5340 y(F)-8 b(or)31
b(the)g(meaning)f(of)h(parameters)g Fi(small)e Fj(and)g
Fi(verbosity)p Fj(,)f(see)j Fi(BZ2_bzDecompressInit)p
Fj(.)p eop
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29 29 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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(b)s(e)f(kno)m(wn)g(in)g(adv)-5 b(ance,)31 b(there)150
408 y(is)g(no)f(easy)i(w)m(a)m(y)f(to)h(guaran)m(tee)g(that)f(the)g
(output)g(bu\013er)f(will)h(b)s(e)f(big)h(enough.)42
b(Y)-8 b(ou)30 b(ma)m(y)i(of)e(course)150 518 y(mak)m(e)j(arrangemen)m
(ts)h(in)e(y)m(our)h(co)s(de)f(to)i(record)f(the)g(size)g(of)g(the)g
(uncompressed)e(data,)j(but)e(suc)m(h)g(a)150 628 y(mec)m(hanism)e(is)h
(b)s(ey)m(ond)f(the)g(scop)s(e)h(of)f(this)h(library)-8
b(.)150 784 y Fi(BZ2_bzBuffToBuffDecompre)o(ss)24 b Fj(will)31
b(not)g(write)g(data)f(at)h(or)g(b)s(ey)m(ond)e Fi(dest[*destLen])p
Fj(,)e(ev)m(en)k(in)150 894 y(case)g(of)g(bu\013er)e(o)m(v)m(er\015o)m
(w.)150 1051 y(P)m(ossible)j(return)e(v)-5 b(alues:)572
1202 y Fi(BZ_CONFIG_ERROR)663 1306 y Fj(if)30 b(the)h(library)f(has)g
(b)s(een)g(mis-compiled)572 1409 y Fi(BZ_PARAM_ERROR)663
1513 y Fj(if)g Fi(dest)f Fj(is)i Fi(NULL)e Fj(or)i Fi(destLen)d
Fj(is)i Fi(NULL)663 1617 y Fj(or)g Fi(small)47 b(!=)g(0)g(&&)h(small)e
(!=)h(1)663 1721 y Fj(or)30 b Fi(verbosity)46 b(<)h(0)30
b Fj(or)h Fi(verbosity)45 b(>)i(4)572 1825 y(BZ_MEM_ERROR)663
1928 y Fj(if)30 b(insu\016cien)m(t)h(memory)f(is)h(a)m(v)-5
b(ailable)572 2032 y Fi(BZ_OUTBUFF_FULL)663 2136 y Fj(if)30
b(the)h(size)g(of)g(the)f(compressed)h(data)f(exceeds)i
Fi(*destLen)572 2240 y(BZ_DATA_ERROR)663 2343 y Fj(if)e(a)h(data)f(in)m
(tegrit)m(y)j(error)e(w)m(as)g(detected)g(in)g(the)f(compressed)h(data)
572 2447 y Fi(BZ_DATA_ERROR_MAGIC)663 2551 y Fj(if)f(the)h(compressed)f
(data)h(do)s(esn't)f(b)s(egin)g(with)g(the)h(righ)m(t)g(magic)h(b)m
(ytes)572 2655 y Fi(BZ_UNEXPECTED_EOF)663 2759 y Fj(if)e(the)h
(compressed)f(data)h(ends)e(unexp)s(ectedly)572 2862
y Fi(BZ_OK)663 2966 y Fj(otherwise)150 3370 y Fk(3.6)68
b Fc(zlib)43 b Fk(compatibilit)l(y)k(functions)150 3563
y Fj(Y)-8 b(oshiok)j(a)32 b(Tsuneo)f(has)f(con)m(tributed)i(some)f
(functions)g(to)h(giv)m(e)h(b)s(etter)e Fi(zlib)f Fj(compatibilit)m(y)
-8 b(.)46 b(These)150 3673 y(functions)37 b(are)g Fi(BZ2_bzopen)p
Fj(,)f Fi(BZ2_bzread)p Fj(,)g Fi(BZ2_bzwrite)p Fj(,)g
Fi(BZ2_bzflush)p Fj(,)f Fi(BZ2_bzclose)p Fj(,)h Fi(BZ2_)150
3782 y(bzerror)22 b Fj(and)g Fi(BZ2_bzlibVersion)p Fj(.)34
b(These)24 b(functions)f(are)h(not)g(\(y)m(et\))h(o\016cially)g(part)f
(of)g(the)f(library)-8 b(.)150 3892 y(If)30 b(they)h(break,)f(y)m(ou)h
(get)h(to)f(k)m(eep)g(all)g(the)g(pieces.)41 b(Nev)m(ertheless,)33
b(I)e(think)f(they)g(w)m(ork)h(ok.)390 4043 y Fi(typedef)46
b(void)g(BZFILE;)390 4250 y(const)g(char)h(*)g(BZ2_bzlibVersion)d(\()j
(void)g(\);)150 4407 y Fj(Returns)30 b(a)h(string)f(indicating)h(the)g
(library)f(v)m(ersion.)390 4558 y Fi(BZFILE)46 b(*)i(BZ2_bzopen)92
b(\()48 b(const)e(char)h(*path,)f(const)g(char)h(*mode)f(\);)390
4662 y(BZFILE)g(*)i(BZ2_bzdopen)c(\()k(int)381 b(fd,)190
b(const)46 b(char)h(*mode)f(\);)150 4819 y Fj(Op)s(ens)36
b(a)i Fi(.bz2)e Fj(\014le)i(for)f(reading)h(or)f(writing,)j(using)d
(either)h(its)g(name)f(or)h(a)g(pre-existing)g(\014le)g(de-)150
4928 y(scriptor.)j(Analogous)31 b(to)g Fi(fopen)e Fj(and)h
Fi(fdopen)p Fj(.)390 5079 y Fi(int)47 b(BZ2_bzread)93
b(\()47 b(BZFILE*)f(b,)h(void*)f(buf,)h(int)g(len)g(\);)390
5183 y(int)g(BZ2_bzwrite)e(\()i(BZFILE*)f(b,)h(void*)f(buf,)h(int)g
(len)g(\);)150 5340 y Fj(Reads/writes)31 b(data)g(from/to)g(a)g
(previously)f(op)s(ened)f Fi(BZFILE)p Fj(.)39 b(Analogous)31
b(to)g Fi(fread)e Fj(and)g Fi(fwrite)p Fj(.)p eop
%%Page: 30 31
30 30 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
b(with)g Fi(libbzip2)1881 b Fl(30)390 299 y Fi(int)95
b(BZ2_bzflush)44 b(\()k(BZFILE*)e(b)h(\);)390 403 y(void)g(BZ2_bzclose)
d(\()k(BZFILE*)e(b)h(\);)150 559 y Fj(Flushes/closes)29
b(a)f Fi(BZFILE)p Fj(.)38 b Fi(BZ2_bzflush)25 b Fj(do)s(esn't)j
(actually)h(do)f(an)m(ything.)41 b(Analogous)28 b(to)h
Fi(fflush)150 669 y Fj(and)h Fi(fclose)p Fj(.)390 820
y Fi(const)46 b(char)h(*)g(BZ2_bzerror)e(\()j(BZFILE)e(*b,)h(int)g
(*errnum)e(\))150 977 y Fj(Returns)29 b(a)h(string)g(describing)g(the)f
(more)i(recen)m(t)g(error)f(status)g(of)f Fi(b)p Fj(,)h(and)f(also)h
(sets)g Fi(*errnum)e Fj(to)i(its)150 1087 y(n)m(umerical)h(v)-5
b(alue.)150 1411 y Fk(3.7)68 b(Using)46 b(the)f(library)g(in)g(a)g
Fc(stdio)p Fk(-free)f(en)l(vironmen)l(t)150 1723 y Fe(3.7.1)63
b(Getting)41 b(rid)g(of)g Fd(stdio)150 1915 y Fj(In)g(a)g(deeply)h(em)m
(b)s(edded)e(application,)46 b(y)m(ou)41 b(migh)m(t)i(w)m(an)m(t)f(to)g
(use)f(just)g(the)h(memory-to-memory)150 2025 y(functions.)d(Y)-8
b(ou)27 b(can)g(do)g(this)g(con)m(v)m(enien)m(tly)j(b)m(y)d(compiling)h
(the)f(library)g(with)g(prepro)s(cessor)g(sym)m(b)s(ol)150
2135 y Fi(BZ_NO_STDIO)34 b Fj(de\014ned.)60 b(Doing)38
b(this)f(giv)m(es)i(y)m(ou)e(a)h(library)f(con)m(taining)i(only)e(the)h
(follo)m(wing)g(eigh)m(t)150 2244 y(functions:)150 2401
y Fi(BZ2_bzCompressInit)p Fj(,)26 b Fi(BZ2_bzCompress)p
Fj(,)g Fi(BZ2_bzCompressEnd)150 2511 y(BZ2_bzDecompressInit)p
Fj(,)f Fi(BZ2_bzDecompress)p Fj(,)h Fi(BZ2_bzDecompressEnd)150
2620 y(BZ2_bzBuffToBuffCompress)o Fj(,)f Fi(BZ2_bzBuffToBuffDecompre)o
(ss)150 2777 y Fj(When)30 b(compiled)h(lik)m(e)g(this,)g(all)g
(functions)f(will)h(ignore)g Fi(verbosity)d Fj(settings.)150
3053 y Fe(3.7.2)63 b(Critical)40 b(error)h(handling)150
3246 y Fi(libbzip2)18 b Fj(con)m(tains)k(a)f(n)m(um)m(b)s(er)e(of)i(in)
m(ternal)h(assertion)f(c)m(hec)m(ks)h(whic)m(h)f(should,)g(needless)g
(to)h(sa)m(y)-8 b(,)23 b(nev)m(er)150 3355 y(b)s(e)35
b(activ)-5 b(ated.)58 b(Nev)m(ertheless,)40 b(if)35 b(an)h(assertion)g
(should)f(fail,)i(b)s(eha)m(viour)f(dep)s(ends)e(on)h(whether)h(or)150
3465 y(not)31 b(the)f(library)h(w)m(as)f(compiled)h(with)f
Fi(BZ_NO_STDIO)e Fj(set.)150 3622 y(F)-8 b(or)31 b(a)g(normal)f
(compile,)i(an)e(assertion)h(failure)f(yields)h(the)g(message)533
3773 y Fi(bzip2/libbzip2:)44 b(internal)h(error)i(number)f(N.)533
3877 y(This)h(is)g(a)g(bug)g(in)h(bzip2/libbzip2,)43
b(1.0.2,)j(30-Dec-2001.)533 3980 y(Please)g(report)g(it)i(to)f(me)g
(at:)g(jseward@acm.org.)91 b(If)47 b(this)g(happened)533
4084 y(when)g(you)g(were)f(using)h(some)f(program)g(which)h(uses)f
(libbzip2)g(as)h(a)533 4188 y(component,)e(you)i(should)f(also)h
(report)f(this)h(bug)f(to)i(the)f(author\(s\))533 4292
y(of)g(that)g(program.)93 b(Please)46 b(make)h(an)g(effort)f(to)h
(report)g(this)f(bug;)533 4395 y(timely)g(and)h(accurate)f(bug)h
(reports)e(eventually)g(lead)i(to)g(higher)533 4499 y(quality)f
(software.)93 b(Thanks.)h(Julian)46 b(Seward,)f(30)j(December)d(2001.)
150 4656 y Fj(where)33 b Fi(N)g Fj(is)g(some)g(error)h(co)s(de)f(n)m
(um)m(b)s(er.)48 b(If)32 b Fi(N)e(==)g(1007)p Fj(,)j(it)h(also)f(prin)m
(ts)g(some)h(extra)g(text)g(advising)150 4766 y(the)e(reader)f(that)h
(unreliable)f(memory)h(is)f(often)h(asso)s(ciated)g(with)f(in)m(ternal)
h(error)g(1007.)45 b(\(This)32 b(is)f(a)150 4875 y(frequen)m
(tly-observ)m(ed-phenomenon)g(with)f(v)m(ersions)h(1.0.0/1.0.1\).)150
5032 y Fi(exit\(3\))d Fj(is)j(then)f(called.)150 5189
y(F)-8 b(or)31 b(a)g Fi(stdio)p Fj(-free)e(library)-8
b(,)31 b(assertion)h(failures)e(result)h(in)f(a)g(call)i(to)f(a)f
(function)h(declared)f(as:)533 5340 y Fi(extern)46 b(void)h
(bz_internal_error)c(\()k(int)g(errcode)f(\);)p eop
%%Page: 31 32
31 31 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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b(Y)-8 b(ou)31 b(should)e(supply)g(suc)m(h)h(a)g(function.)150
456 y(In)f(either)h(case,)g(once)g(an)f(assertion)h(failure)f(has)f(o)s
(ccurred,)i(an)m(y)f Fi(bz_stream)e Fj(records)i(in)m(v)m(olv)m(ed)i
(can)150 565 y(b)s(e)f(regarded)g(as)h(in)m(v)-5 b(alid.)41
b(Y)-8 b(ou)30 b(should)f(not)i(attempt)h(to)f(resume)f(normal)h(op)s
(eration)g(with)f(them.)150 722 y(Y)-8 b(ou)27 b(ma)m(y)-8
b(,)28 b(of)f(course,)h(c)m(hange)f(critical)i(error)e(handling)f(to)h
(suit)g(y)m(our)g(needs.)39 b(As)26 b(I)h(said)f(ab)s(o)m(v)m(e,)j
(crit-)150 832 y(ical)f(errors)g(indicate)g(bugs)e(in)h(the)h(library)f
(and)f(should)g(not)i(o)s(ccur.)40 b(All)27 b Fi(")p
Fj(normal)p Fi(")g Fj(error)g(situations)150 941 y(are)k(indicated)g
(via)f(error)h(return)f(co)s(des)h(from)f(functions,)g(and)g(can)g(b)s
(e)g(reco)m(v)m(ered)i(from.)150 1221 y Fk(3.8)68 b(Making)45
b(a)g(Windo)l(ws)h(DLL)150 1414 y Fj(Ev)m(erything)31
b(related)g(to)h(Windo)m(ws)e(has)f(b)s(een)h(con)m(tributed)h(b)m(y)f
(Y)-8 b(oshiok)j(a)32 b(Tsuneo)150 1523 y(\()p Fi
(QWF00133@niftyserve.or.jp)45 b Fj(/)53 b Fi(tsuneo-y@is.aist-nara.a)o
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150 2166 y Fi(blocksort.c)p Fj(,)28 b Fi(bzlib.c)p Fj(,)g
Fi(compress.c)p Fj(,)g Fi(crctable.c)p Fj(,)g Fi(decompress.c)p
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b Fj(and)h Fi(libbz2.def)p Fj(.)51 b(Y)-8 b(ou)35 b(will)g(also)g(need)
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(propro)s(cessor)f(sym)m(b)s(ol)g Fi(_WIN32)p Fj(.)150
2698 y(Finally)-8 b(,)30 b Fi(dlltest.c)25 b Fj(is)j(a)g(sample)g
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b Fa(.)16 b(.)j(.)g(.)h(.)f(.)h(.)f(.)h(.)f(.)h(.)f(.)g(.)h(.)f(.)72
b Fk(10)449 2413 y Fj(3.1)92 b(T)-8 b(op-lev)m(el)33
b(structure)18 b Fb(.)d(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g
(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
g(.)g(.)g(.)g(.)g(.)g(.)47 b Fl(10)748 2523 y Fj(3.1.1)93
b(Lo)m(w-lev)m(el)32 b(summary)20 b Fb(.)15 b(.)g(.)g(.)g(.)g(.)g(.)g
(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
g(.)g(.)g(.)50 b Fl(10)748 2633 y Fj(3.1.2)93 b(High-lev)m(el)32
b(summary)27 b Fb(.)15 b(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)57
b Fl(10)748 2742 y Fj(3.1.3)93 b(Utilit)m(y)32 b(functions)e(summary)10
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g(.)g(.)g(.)g(.)g(.)39 b Fl(11)449 2852 y Fj(3.2)92 b(Error)30
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
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g(.)g(.)g(.)53 b Fl(13)748 3071 y Fj(3.3.1)93 b Fi(BZ2_bzCompressInit)
21 b Fb(.)9 b(.)15 b(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)
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3181 y Fj(3.3.2)93 b Fi(BZ2_bzCompress)9 b Fb(.)h(.)15
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)38 b Fl(15)748
3290 y Fj(3.3.3)93 b Fi(BZ2_bzCompressEnd)23 b Fb(.)10
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(.)g(.)g(.)g(.)g(.)45 b Fl(18)748 3509 y Fj(3.3.5)93
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g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g
(.)55 b Fl(18)748 3619 y Fj(3.3.6)93 b Fi(BZ2_bzDecompressEnd)18
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)48 b Fl(20)449
3729 y Fj(3.4)92 b(High-lev)m(el)33 b(in)m(terface)9
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)
g(.)g(.)g(.)38 b Fl(20)748 3838 y Fj(3.4.1)93 b Fi(BZ2_bzReadOpen)9
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)38
b Fl(20)748 3948 y Fj(3.4.2)93 b Fi(BZ2_bzRead)18 b Fb(.)12
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(.)g(.)g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)47
b Fl(21)748 4057 y Fj(3.4.3)93 b Fi(BZ2_bzReadGetUnused)18
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)48 b Fl(23)748
4167 y Fj(3.4.4)93 b Fi(BZ2_bzReadClose)23 b Fb(.)15
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)57 b Fl(23)748
4276 y Fj(3.4.5)93 b Fi(BZ2_bzWriteOpen)23 b Fb(.)15
b(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g
(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)57 b Fl(23)748
4386 y Fj(3.4.6)93 b Fi(BZ2_bzWrite)16 b Fb(.)11 b(.)k(.)g(.)g(.)g(.)g
(.)g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
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4496 y Fj(3.4.7)93 b Fi(BZ2_bzWriteClose)21 b Fb(.)15
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)55 b Fl(25)748
4605 y Fj(3.4.8)93 b(Handling)30 b(em)m(b)s(edded)f(compressed)h(data)h
(streams)9 b Fb(.)15 b(.)g(.)g(.)38 b Fl(25)748 4715
y Fj(3.4.9)93 b(Standard)29 b(\014le-reading/writing)j(co)s(de)16
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b Fl(26)449 4824 y Fj(3.5)92 b(Utilit)m(y)32 b(functions)c
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g(.)g(.)g(.)g(.)h(.)57 b Fl(27)748 4934 y Fj(3.5.1)93
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5044 y Fj(3.5.2)93 b Fi(BZ2_bzBuffToBuffDecompr)o(ess)17
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53 b Fl(28)449 5153 y Fj(3.6)92 b Fi(zlib)29 b Fj(compatibilit)m(y)k
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b Fl(29)449 5263 y Fj(3.7)92 b(Using)30 b(the)h(library)f(in)g(a)h
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)46 b Fl(31)150
545 y Fk(4)135 b(Miscellanea)11 b Fa(.)21 b(.)f(.)f(.)h(.)f(.)g(.)h(.)f
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f(.)h(.)f(.)g(.)h(.)56 b Fk(32)449 682 y Fj(4.1)92 b(Limitations)31
b(of)g(the)g(compressed)f(\014le)g(format)c Fb(.)15 b(.)g(.)g(.)g(.)g
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g(.)g(.)g(.)g(.)41 b Fl(33)449 901 y Fj(4.3)92 b(Rep)s(orting)31
b(bugs)24 b Fb(.)15 b(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g
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(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)47 b Fl(35)449
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g(.)g(.)g(.)g(.)g(.)46 b Fl(35)449 1230 y Fj(4.6)92 b(F)-8
b(urther)30 b(reading)17 b Fb(.)f(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g
(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)
g(.)g(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)46 b
Fl(36)p eop
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