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Fj(bunzip2)g Fl(-)h(a)h(blo)s(c)m(k-sorting)f(\014le)f(compressor,)i
(v1.0)570 1136 y Fj(bzcat)e Fl(-)i(decompresses)f(\014les)f(to)i
(stdout)570 1267 y Fj(bzip2recover)c Fl(-)k(reco)m(v)m(ers)h(data)f
(from)f(damaged)g(bzip2)g(\014les)390 1519 y Ff(SYNOPSIS)570
1706 y Fj(bzip2)f Fl([)h(-cdfkqstvzVL123456789)35 b(])c([)g
(\014lenames)e(...)41 b(])570 1837 y Fj(bunzip2)28 b
Fl([)j(-fkvsVL)f(])h([)f(\014lenames)g(...)41 b(])570
1968 y Fj(bzcat)29 b Fl([)h(-s)h(])g([)f(\014lenames)g(...)41
b(])570 2100 y Fj(bzip2recover)27 b Fl(\014lename)390
2352 y Ff(DESCRIPTION)390 2538 y Fj(bzip2)i Fl(compresses)i(\014les)f
(using)f(the)i(Burro)m(ws-Wheeler)g(blo)s(c)m(k)f(sorting)g(text)i
(compres-)390 2642 y(sion)40 b(algorithm,)j(and)d(Hu\013man)h(co)s
(ding.)71 b(Compression)40 b(is)g(generally)g(considerably)390
2746 y(b)s(etter)25 b(than)g(that)h(ac)m(hiev)m(ed)g(b)m(y)f(more)g
(con)m(v)m(en)m(tional)h(LZ77/LZ78-based)g(compressors,)390
2850 y(and)k(approac)m(hes)h(the)f(p)s(erformance)g(of)h(the)f(PPM)g
(family)f(of)i(statistical)f(compressors.)390 3001 y(The)e
(command-line)e(options)i(are)h(delib)s(erately)d(v)m(ery)i(similar)e
(to)j(those)g(of)f(GNU)h Fj(gzip)p Fl(,)390 3104 y(but)h(they)g(are)h
(not)g(iden)m(tical.)390 3255 y Fj(bzip2)f Fl(exp)s(ects)h(a)g(list)f
(of)h(\014le)f(names)h(to)h(accompan)m(y)h(the)e(command-line)e
(\015ags.)43 b(Eac)m(h)390 3359 y(\014le)e(is)h(replaced)g(b)m(y)g(a)h
(compressed)f(v)m(ersion)g(of)g(itself,)i(with)e(the)g(name)g
Fj(original_)390 3463 y(name.bz2)p Fl(.)49 b(Eac)m(h)34
b(compressed)g(\014le)f(has)g(the)h(same)g(mo)s(di\014cation)e(date,)k
(p)s(ermissions,)390 3567 y(and,)24 b(when)f(p)s(ossible,)f(o)m
(wnership)f(as)j(the)f(corresp)s(onding)f(original,)h(so)g(that)h
(these)g(prop-)390 3671 y(erties)34 b(can)g(b)s(e)f(correctly)i
(restored)f(at)g(decompression)f(time.)51 b(File)34 b(name)g(handling)d
(is)390 3774 y(naiv)m(e)26 b(in)f(the)i(sense)f(that)h(there)f(is)f(no)
i(mec)m(hanism)e(for)h(preserving)f(original)f(\014le)i(names,)390
3878 y(p)s(ermissions,)37 b(o)m(wnerships)f(or)h(dates)i(in)d
(\014lesystems)h(whic)m(h)g(lac)m(k)h(these)g(concepts,)j(or)390
3982 y(ha)m(v)m(e)32 b(serious)d(\014le)g(name)i(length)f
(restrictions,)f(suc)m(h)h(as)h(MS-DOS.)390 4133 y Fj(bzip2)26
b Fl(and)h Fj(bunzip2)e Fl(will)f(b)m(y)k(default)e(not)i(o)m(v)m
(erwrite)g(existing)e(\014les.)38 b(If)27 b(y)m(ou)h(w)m(an)m(t)g(this)
390 4237 y(to)j(happ)s(en,)e(sp)s(ecify)g(the)i Fj(-f)e
Fl(\015ag.)390 4388 y(If)34 b(no)h(\014le)f(names)g(are)i(sp)s
(eci\014ed,)e Fj(bzip2)f Fl(compresses)i(from)f(standard)g(input)f(to)j
(stan-)390 4491 y(dard)c(output.)49 b(In)32 b(this)g(case,)k
Fj(bzip2)31 b Fl(will)g(decline)h(to)i(write)e(compressed)h(output)g
(to)h(a)390 4595 y(terminal,)29 b(as)i(this)e(w)m(ould)g(b)s(e)h(en)m
(tirely)f(incomprehensible)e(and)j(therefore)h(p)s(oin)m(tless.)390
4746 y Fj(bunzip2)36 b Fl(\(or)j Fj(bzip2)29 b(-d)p Fl(\))37
b(decompresses)i(all)e(sp)s(eci\014ed)f(\014les.)63 b(Files)37
b(whic)m(h)g(w)m(ere)i(not)390 4850 y(created)e(b)m(y)f
Fj(bzip2)f Fl(will)e(b)s(e)i(detected)j(and)d(ignored,)i(and)e(a)i(w)m
(arning)d(issued.)56 b Fj(bzip2)390 4954 y Fl(attempts)31
b(to)f(guess)g(the)g(\014lename)f(for)h(the)g(decompressed)f(\014le)g
(from)h(that)g(of)g(the)g(com-)390 5058 y(pressed)f(\014le)h(as)h
(follo)m(ws:)570 5209 y Fj(filename.bz2)57 b Fl(b)s(ecomes)31
b Fj(filename)570 5340 y(filename.bz)58 b Fl(b)s(ecomes)30
b Fj(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 Fj(bzip2)2375 b Fl(4)570 299 y Fj(filename.tbz2)27
b Fl(b)s(ecomes)j Fj(filename.tar)570 470 y(filename.tbz)57
b Fl(b)s(ecomes)31 b Fj(filename.tar)570 641 y(anyothername)57
b Fl(b)s(ecomes)31 b Fj(anyothername.out)390 859 y Fl(If)j(the)h
(\014le)e(do)s(es)i(not)f(end)g(in)f(one)i(of)g(the)g(recognised)f
(endings,)g Fj(.bz2)p Fl(,)h Fj(.bz)p Fl(,)g Fj(.tbz2)e
Fl(or)390 963 y Fj(.tbz)p Fl(,)h Fj(bzip2)f Fl(complains)f(that)j(it)e
(cannot)i(guess)f(the)g(name)h(of)f(the)g(original)e(\014le,)j(and)390
1067 y(uses)30 b(the)g(original)f(name)h(with)g Fj(.out)f
Fl(app)s(ended.)390 1218 y(As)j(with)f(compression,)h(supplying)c(no)k
(\014lenames)f(causes)i(decompression)e(from)h(stan-)390
1321 y(dard)d(input)g(to)i(standard)e(output.)390 1472
y Fj(bunzip2)k Fl(will)g(correctly)j(decompress)e(a)i(\014le)e(whic)m
(h)g(is)h(the)g(concatenation)i(of)e(t)m(w)m(o)i(or)390
1576 y(more)j(compressed)f(\014les.)67 b(The)39 b(result)g(is)g(the)g
(concatenation)i(of)f(the)g(corresp)s(onding)390 1680
y(uncompressed)c(\014les.)59 b(In)m(tegrit)m(y)38 b(testing)f(\()p
Fj(-t)p Fl(\))g(of)g(concatenated)i(compressed)e(\014les)f(is)390
1784 y(also)30 b(supp)s(orted.)390 1935 y(Y)-8 b(ou)40
b(can)g(also)f(compress)g(or)g(decompress)g(\014les)g(to)h(the)f
(standard)g(output)g(b)m(y)g(giving)390 2039 y(the)30
b Fj(-c)g Fl(\015ag.)40 b(Multiple)28 b(\014les)h(ma)m(y)i(b)s(e)e
(compressed)h(and)f(decompressed)h(lik)m(e)f(this.)39
b(The)390 2142 y(resulting)31 b(outputs)i(are)h(fed)f(sequen)m(tially)f
(to)i(stdout.)49 b(Compression)32 b(of)h(m)m(ultiple)e(\014les)390
2246 y(in)24 b(this)g(manner)h(generates)h(a)g(stream)f(con)m(taining)g
(m)m(ultiple)e(compressed)i(\014le)f(represen-)390 2350
y(tations.)58 b(Suc)m(h)36 b(a)g(stream)g(can)h(b)s(e)e(decompressed)h
(correctly)h(only)e(b)m(y)h Fj(bzip2)e Fl(v)m(ersion)390
2454 y(0.9.0)g(or)e(later.)47 b(Earlier)30 b(v)m(ersions)i(of)g
Fj(bzip2)f Fl(will)f(stop)i(after)h(decompressing)e(the)i(\014rst)390
2558 y(\014le)c(in)h(the)g(stream.)390 2709 y Fj(bzcat)f
Fl(\(or)i Fj(bzip2)e(-dc)p Fl(\))g(decompresses)i(all)e(sp)s(eci\014ed)
g(\014les)g(to)i(the)g(standard)e(output.)390 2860 y
Fj(bzip2)f Fl(will)g(read)i(argumen)m(ts)g(from)f(the)h(en)m(vironmen)m
(t)g(v)-5 b(ariables)28 b Fj(BZIP2)h Fl(and)g Fj(BZIP)p
Fl(,)g(in)390 2963 y(that)24 b(order,)g(and)f(will)e(pro)s(cess)i(them)
g(b)s(efore)g(an)m(y)h(argumen)m(ts)f(read)h(from)f(the)g(command)390
3067 y(line.)39 b(This)29 b(giv)m(es)h(a)h(con)m(v)m(enien)m(t)h(w)m(a)
m(y)f(to)g(supply)d(default)i(argumen)m(ts.)390 3218
y(Compression)h(is)h(alw)m(a)m(ys)i(p)s(erformed,)e(ev)m(en)h(if)f(the)
h(compressed)g(\014le)f(is)g(sligh)m(tly)f(larger)390
3322 y(than)26 b(the)g(original.)38 b(Files)25 b(of)h(less)g(than)g(ab)
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3426 y(since)34 b(the)g(compression)f(mec)m(hanism)h(has)f(a)i(constan)
m(t)g(o)m(v)m(erhead)h(in)d(the)h(region)g(of)g(50)390
3529 y(b)m(ytes.)54 b(Random)34 b(data)h(\(including)d(the)i(output)h
(of)f(most)h(\014le)f(compressors\))h(is)e(co)s(ded)390
3633 y(at)e(ab)s(out)f(8.05)i(bits)d(p)s(er)h(b)m(yte,)h(giving)e(an)h
(expansion)g(of)g(around)g(0.5\045.)390 3784 y(As)h(a)g(self-c)m(hec)m
(k)h(for)e(y)m(our)h(protection,)g Fj(bzip2)f Fl(uses)g(32-bit)h(CR)m
(Cs)f(to)i(mak)m(e)f(sure)f(that)390 3888 y(the)45 b(decompressed)f(v)m
(ersion)g(of)g(a)h(\014le)e(is)h(iden)m(tical)f(to)i(the)g(original.)81
b(This)43 b(guards)390 3992 y(against)i(corruption)e(of)h(the)h
(compressed)f(data,)49 b(and)44 b(against)h(undetected)g(bugs)e(in)390
4096 y Fj(bzip2)35 b Fl(\(hop)s(efully)e(v)m(ery)k(unlik)m(ely\).)56
b(The)36 b(c)m(hances)h(of)f(data)h(corruption)e(going)h(unde-)390
4199 y(tected)g(is)e(microscopic,)h(ab)s(out)f(one)h(c)m(hance)g(in)f
(four)g(billion)d(for)j(eac)m(h)i(\014le)d(pro)s(cessed.)390
4303 y(Be)38 b(a)m(w)m(are,)k(though,)d(that)f(the)g(c)m(hec)m(k)i(o)s
(ccurs)d(up)s(on)f(decompression,)j(so)f(it)f(can)h(only)390
4407 y(tell)28 b(y)m(ou)g(that)i(something)d(is)h(wrong.)40
b(It)28 b(can't)i(help)d(y)m(ou)i(reco)m(v)m(er)h(the)e(original)f
(uncom-)390 4511 y(pressed)h(data.)41 b(Y)-8 b(ou)30
b(can)f(use)g Fj(bzip2recover)d Fl(to)k(try)f(to)h(reco)m(v)m(er)h
(data)f(from)e(damaged)390 4614 y(\014les.)390 4766 y(Return)22
b(v)-5 b(alues:)37 b(0)23 b(for)g(a)g(normal)f(exit,)j(1)e(for)g(en)m
(vironmen)m(tal)f(problems)f(\(\014le)i(not)g(found,)390
4869 y(in)m(v)-5 b(alid)30 b(\015ags,)k(I/O)f(errors,)g(&c\),)h(2)f(to)
g(indicate)f(a)h(corrupt)f(compressed)h(\014le,)f(3)i(for)e(an)390
4973 y(in)m(ternal)d(consistency)h(error)g(\(eg,)i(bug\))e(whic)m(h)f
(caused)i Fj(bzip2)e Fl(to)i(panic.)390 5304 y Ff(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 Fj(bzip2)2375 b Fl(5)390 299 y Fj(-c)30
b(--stdout)870 403 y Fl(Compress)f(or)i(decompress)f(to)h(standard)e
(output.)390 557 y Fj(-d)h(--decompress)870 661 y Fl(F)-8
b(orce)44 b(decompression.)77 b Fj(bzip2)p Fl(,)44 b
Fj(bunzip2)d Fl(and)h Fj(bzcat)f Fl(are)i(really)f(the)870
764 y(same)27 b(program,)h(and)e(the)i(decision)d(ab)s(out)i(what)g
(actions)g(to)h(tak)m(e)g(is)e(done)870 868 y(on)k(the)h(basis)e(of)i
(whic)m(h)e(name)h(is)g(used.)40 b(This)28 b(\015ag)j(o)m(v)m(errides)f
(that)h(mec)m(h-)870 972 y(anism,)e(and)h(forces)h(bzip2)e(to)i
(decompress.)390 1126 y Fj(-z)f(--compress)870 1230 y
Fl(The)39 b(complemen)m(t)h(to)g Fj(-d)p Fl(:)59 b(forces)40
b(compression,)h(regardless)d(of)i(the)g(in-)870 1334
y(v)m(ok)-5 b(ation)31 b(name.)390 1488 y Fj(-t)f(--test)8
b Fl(Chec)m(k)33 b(in)m(tegrit)m(y)j(of)f(the)g(sp)s(eci\014ed)e
(\014le\(s\),)k(but)d(don't)h(decompress)g(them.)870
1591 y(This)40 b(really)g(p)s(erforms)g(a)i(trial)e(decompression)h
(and)g(thro)m(ws)g(a)m(w)m(a)m(y)j(the)870 1695 y(result.)390
1849 y Fj(-f)30 b(--force)870 1953 y Fl(F)-8 b(orce)31
b(o)m(v)m(erwrite)f(of)g(output)f(\014les.)40 b(Normally)-8
b(,)29 b Fj(bzip2)f Fl(will)f(not)j(o)m(v)m(erwrite)870
2057 y(existing)e(output)g(\014les.)39 b(Also)28 b(forces)h
Fj(bzip2)e Fl(to)i(break)g(hard)e(links)f(to)k(\014les,)870
2161 y(whic)m(h)f(it)h(otherwise)g(w)m(ouldn't)f(do.)390
2315 y Fj(-k)h(--keep)8 b Fl(Keep)24 b(\(don't)i(delete\))h(input)d
(\014les)g(during)g(compression)h(or)h(decompression.)390
2469 y Fj(-s)k(--small)870 2573 y Fl(Reduce)23 b(memory)f(usage,)j(for)
d(compression,)h(decompression)f(and)g(testing.)870 2676
y(Files)f(are)i(decompressed)e(and)h(tested)h(using)e(a)h(mo)s
(di\014ed)e(algorithm)h(whic)m(h)870 2780 y(only)30 b(requires)g(2.5)j
(b)m(ytes)f(p)s(er)e(blo)s(c)m(k)h(b)m(yte.)44 b(This)30
b(means)h(an)m(y)h(\014le)e(can)i(b)s(e)870 2884 y(decompressed)d(in)f
(2300k)j(of)e(memory)-8 b(,)30 b(alb)s(eit)e(at)i(ab)s(out)f(half)g
(the)g(normal)870 2988 y(sp)s(eed.)870 3117 y(During)42
b(compression,)k Fj(-s)d Fl(selects)h(a)g(blo)s(c)m(k)g(size)f(of)h
(200k,)k(whic)m(h)42 b(lim-)870 3220 y(its)33 b(memory)g(use)g(to)h
(around)e(the)i(same)f(\014gure,)h(at)g(the)g(exp)s(ense)f(of)g(y)m
(our)870 3324 y(compression)g(ratio.)50 b(In)33 b(short,)i(if)d(y)m
(our)i(mac)m(hine)f(is)g(lo)m(w)g(on)h(memory)f(\(8)870
3428 y(megab)m(ytes)42 b(or)e(less\),)j(use)d(-s)g(for)g(ev)m
(erything.)71 b(See)40 b(MEMOR)-8 b(Y)41 b(MAN-)870 3532
y(A)m(GEMENT)31 b(b)s(elo)m(w.)390 3686 y Fj(-q)f(--quiet)870
3790 y Fl(Suppress)j(non-essen)m(tial)j(w)m(arning)e(messages.)58
b(Messages)38 b(p)s(ertaining)33 b(to)870 3893 y(I/O)d(errors)g(and)g
(other)h(critical)e(ev)m(en)m(ts)j(will)27 b(not)k(b)s(e)f(suppressed.)
390 4047 y Fj(-v)g(--verbose)870 4151 y Fl(V)-8 b(erb)s(ose)28
b(mo)s(de)f({)i(sho)m(w)e(the)h(compression)f(ratio)h(for)f(eac)m(h)i
(\014le)e(pro)s(cessed.)870 4255 y(F)-8 b(urther)30 b
Fj(-v)p Fl('s)g(increase)g(the)g(v)m(erb)s(osit)m(y)g(lev)m(el,)h(sp)s
(ewing)d(out)j(lots)f(of)g(infor-)870 4359 y(mation)g(whic)m(h)f(is)h
(primarily)d(of)j(in)m(terest)h(for)f(diagnostic)g(purp)s(oses.)390
4513 y Fj(-L)g(--license)e(-V)h(--version)870 4617 y
Fl(Displa)m(y)h(the)g(soft)m(w)m(are)i(v)m(ersion,)e(license)f(terms)i
(and)e(conditions.)390 4771 y Fj(-1)h(to)g(-9)72 b Fl(Set)35
b(the)g(blo)s(c)m(k)f(size)h(to)g(100)h(k,)g(200)g(k)f(..)53
b(900)36 b(k)f(when)f(compressing.)53 b(Has)870 4875
y(no)41 b(e\013ect)h(when)d(decompressing.)71 b(See)41
b(MEMOR)-8 b(Y)41 b(MANA)m(GEMENT)870 4978 y(b)s(elo)m(w.)390
5132 y Fj(--)324 b Fl(T)-8 b(reats)25 b(all)e(subsequen)m(t)g(argumen)m
(ts)i(as)f(\014le)g(names,)h(ev)m(en)g(if)e(they)i(start)f(with)870
5236 y(a)32 b(dash.)43 b(This)29 b(is)h(so)i(y)m(ou)g(can)f(handle)f
(\014les)g(with)g(names)i(b)s(eginning)c(with)870 5340
y(a)j(dash,)f(for)g(example:)40 b Fj(bzip2)29 b(--)h(-myfilename)p
Fl(.)p eop
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6 6 bop 150 -116 a Fl(Chapter)30 b(2:)41 b(Ho)m(w)31
b(to)g(use)f Fj(bzip2)2375 b Fl(6)390 299 y Fj(--repetitive-fast)390
427 y(--repetitive-best)870 530 y Fl(These)34 b(\015ags)g(are)h
(redundan)m(t)e(in)g(v)m(ersions)g(0.9.5)j(and)e(ab)s(o)m(v)m(e.)53
b(They)34 b(pro-)870 634 y(vided)h(some)i(coarse)g(con)m(trol)g(o)m(v)m
(er)g(the)g(b)s(eha)m(viour)e(of)h(the)g(sorting)g(algo-)870
738 y(rithm)h(in)h(earlier)g(v)m(ersions,)j(whic)m(h)d(w)m(as)h
(sometimes)h(useful.)65 b(0.9.5)41 b(and)870 842 y(ab)s(o)m(v)m(e)34
b(ha)m(v)m(e)g(an)f(impro)m(v)m(ed)g(algorithm)f(whic)m(h)f(renders)h
(these)h(\015ags)h(irrel-)870 946 y(ev)-5 b(an)m(t.)390
1190 y Ff(MEMOR)-10 b(Y)40 b(MANA)m(GEMENT)390 1377 y
Fj(bzip2)25 b Fl(compresses)i(large)g(\014les)e(in)g(blo)s(c)m(ks.)39
b(The)26 b(blo)s(c)m(k)h(size)f(a\013ects)i(b)s(oth)e(the)h(compres-)
390 1481 y(sion)39 b(ratio)g(ac)m(hiev)m(ed,)k(and)d(the)f(amoun)m(t)i
(of)e(memory)h(needed)f(for)h(compression)f(and)390 1585
y(decompression.)59 b(The)36 b(\015ags)h Fj(-1)f Fl(through)h
Fj(-9)f Fl(sp)s(ecify)f(the)i(blo)s(c)m(k)g(size)f(to)i(b)s(e)e
(100,000)390 1688 y(b)m(ytes)29 b(through)e(900,000)k(b)m(ytes)d(\(the)
h(default\))e(resp)s(ectiv)m(ely)-8 b(.)40 b(A)m(t)29
b(decompression)e(time,)390 1792 y(the)32 b(blo)s(c)m(k)g(size)g(used)g
(for)g(compression)f(is)g(read)h(from)g(the)g(header)g(of)h(the)f
(compressed)390 1896 y(\014le,)j(and)f Fj(bunzip2)e Fl(then)i(allo)s
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b(to)i(mak)m(e)g(sure)e(the)i(calling)d(program)i(do)s(es)g(not)g(c)m
(heat,)i(the)f(library)c(mak)m(es)k(a)f(note)h(of)f Fj(avail_in)150
1489 y Fl(at)g(the)g(time)f(of)g(the)g(\014rst)g(call)g(to)h
Fj(BZ2_bzCompress)21 b Fl(whic)m(h)j(has)h Fj(BZ_FINISH)e
Fl(as)i(an)h(action)f(\(ie,)i(at)f(the)150 1599 y(time)d(the)h(program)
g(has)f(announced)g(its)h(in)m(ten)m(tion)f(to)h(not)g(supply)e(an)m(y)
i(more)g(input\).)37 b(By)24 b(comparing)150 1708 y(this)k(v)-5
b(alue)28 b(with)g(that)h(of)h Fj(avail_in)c Fl(o)m(v)m(er)k(subsequen)
m(t)f(calls)f(to)h Fj(BZ2_bzCompress)p Fl(,)d(the)j(library)e(can)150
1818 y(detect)33 b(an)m(y)e(attempts)i(to)f(slip)d(in)h(more)h(data)h
(to)h(compress.)43 b(An)m(y)31 b(calls)g(for)g(whic)m(h)f(this)g(is)h
(detected)150 1928 y(will)j(return)h Fj(BZ_SEQUENCE_ERROR)p
Fl(.)55 b(This)34 b(indicates)i(a)h(programming)e(mistak)m(e)i(whic)m
(h)e(should)g(b)s(e)150 2037 y(corrected.)150 2194 y(Instead)i(of)g
(asking)f(to)h(\014nish,)f(the)h(calling)f(program)g(ma)m(y)h(ask)g
Fj(BZ2_bzCompress)c Fl(to)38 b(tak)m(e)g(all)e(the)150
2304 y(remaining)j(input,)i(compress)f(it)g(and)g(terminate)h(the)g
(curren)m(t)f(\(Burro)m(ws-Wheeler\))h(compression)150
2413 y(blo)s(c)m(k.)e(This)26 b(could)h(b)s(e)g(useful)f(for)h(error)h
(con)m(trol)g(purp)s(oses.)38 b(The)27 b(mec)m(hanism)g(is)g(analogous)
h(to)g(that)150 2523 y(for)35 b(\014nishing:)46 b(call)35
b Fj(BZ2_bzCompress)c Fl(with)i(an)i(action)g(of)g Fj(BZ_FLUSH)p
Fl(,)g(remo)m(v)m(e)h(output)f(data,)i(and)150 2632 y(p)s(ersist)h
(with)g(the)i Fj(BZ_FLUSH)e Fl(action)i(un)m(til)e(the)i(v)-5
b(alue)39 b Fj(BZ_RUN)f Fl(is)h(returned.)68 b(As)39
b(with)g(\014nishing,)150 2742 y Fj(BZ2_bzCompress)23
b Fl(detects)28 b(an)m(y)f(attempt)h(to)f(pro)m(vide)f(more)h(input)e
(data)i(once)g(the)g(\015ush)e(has)i(b)s(egun.)150 2899
y(Once)j(the)h(\015ush)e(is)g(complete,)i(the)g(stream)f(returns)g(to)h
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b(Here's)33 b(a)f(table)g(whic)m(h)f(sho)m(ws)h(whic)m(h)f(actions)150
3165 y(are)e(allo)m(w)m(able)f(in)f(eac)m(h)j(state,)g(what)f(action)g
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(what)h(the)150 3275 y(non-error)h(return)f(v)-5 b(alues)29
b(are.)41 b(Note)32 b(that)e(y)m(ou)h(can't)g(explicitly)d(ask)i(what)g
(state)i(the)e(stream)h(is)e(in,)150 3384 y(but)h(nor)g(do)g(y)m(ou)h
(need)f(to)h({)g(it)e(can)i(b)s(e)f(inferred)e(from)i(the)h(v)-5
b(alues)29 b(returned)h(b)m(y)g Fj(BZ2_bzCompress)p Fl(.)390
3535 y(IDLE/)p Fj(any)572 3639 y Fl(Illegal.)60 b(IDLE)30
b(state)i(only)d(exists)h(after)h Fj(BZ2_bzCompressEnd)26
b Fl(or)572 3743 y(b)s(efore)k Fj(BZ2_bzCompressInit)p
Fl(.)572 3847 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_SEQUENCE_ERROR)390
4054 y Fl(R)m(UNNING/)p Fj(BZ_RUN)572 4158 y Fl(Compress)f(from)h
Fj(next_in)f Fl(to)i Fj(next_out)d Fl(as)i(m)m(uc)m(h)h(as)f(p)s
(ossible.)572 4262 y(Next)h(state)h(=)e(R)m(UNNING)572
4366 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_RUN_OK)390
4573 y Fl(R)m(UNNING/)p Fj(BZ_FLUSH)572 4677 y Fl(Remem)m(b)s(er)g
(curren)m(t)g(v)-5 b(alue)30 b(of)g Fj(next_in)p Fl(.)59
b(Compress)30 b(from)g Fj(next_in)572 4781 y Fl(to)h
Fj(next_out)d Fl(as)j(m)m(uc)m(h)f(as)h(p)s(ossible,)d(but)i(do)g(not)g
(accept)i(an)m(y)f(more)f(input.)572 4885 y(Next)h(state)h(=)e
(FLUSHING)572 4988 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_FLUSH_OK)390
5196 y Fl(R)m(UNNING/)p Fj(BZ_FINISH)572 5300 y Fl(Remem)m(b)s(er)g
(curren)m(t)g(v)-5 b(alue)30 b(of)g Fj(next_in)p Fl(.)59
b(Compress)30 b(from)g Fj(next_in)p eop
%%Page: 16 17
16 16 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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Fl(as)j(m)m(uc)m(h)f(as)h(p)s(ossible,)d(but)i(do)g(not)g(accept)i(an)m
(y)f(more)f(input.)572 403 y(Next)h(state)h(=)e(FINISHING)572
506 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_FINISH_OK)390
714 y Fl(FLUSHING/)p Fj(BZ_FLUSH)572 818 y Fl(Compress)f(from)h
Fj(next_in)f Fl(to)i Fj(next_out)d Fl(as)i(m)m(uc)m(h)h(as)f(p)s
(ossible,)572 922 y(but)f(do)i(not)f(accept)i(an)m(y)f(more)f(input.)
572 1025 y(If)g(all)f(the)i(existing)e(input)f(has)i(b)s(een)g(used)g
(up)f(and)h(all)f(compressed)572 1129 y(output)h(has)g(b)s(een)g(remo)m
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y(Next)h(state)h(=)e(FLUSHING;)h(Return)e(v)-5 b(alue)30
b(=)g Fj(BZ_FLUSH_OK)390 1648 y Fl(FLUSHING/other)572
1752 y(Illegal.)572 1856 y(Return)f(v)-5 b(alue)30 b(=)g
Fj(BZ_SEQUENCE_ERROR)390 2063 y Fl(FINISHING/)p Fj(BZ_FINISH)572
2167 y Fl(Compress)f(from)h Fj(next_in)f Fl(to)i Fj(next_out)d
Fl(as)i(m)m(uc)m(h)h(as)f(p)s(ossible,)572 2271 y(but)f(to)j(not)e
(accept)i(an)m(y)f(more)f(input.)572 2374 y(If)g(all)f(the)i(existing)e
(input)f(has)i(b)s(een)g(used)g(up)f(and)h(all)f(compressed)572
2478 y(output)h(has)g(b)s(een)g(remo)m(v)m(ed)663 2582
y(Next)h(state)h(=)e(IDLE;)g(Return)g(v)-5 b(alue)30
b(=)g Fj(BZ_STREAM_END)572 2686 y Fl(else)663 2790 y(Next)h(state)h(=)e
(FINISHING;)g(Return)g(v)-5 b(alue)30 b(=)g Fj(BZ_FINISHING)390
2997 y Fl(FINISHING/other)572 3101 y(Illegal.)572 3205
y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_SEQUENCE_ERROR)150
3361 y Fl(That)24 b(still)f(lo)s(oks)g(complicated?)39
b(W)-8 b(ell,)25 b(fair)f(enough.)38 b(The)24 b(usual)f(sequence)i(of)f
(calls)g(for)g(compressing)150 3471 y(a)31 b(load)f(of)g(data)h(is:)225
3628 y Fi(\017)60 b Fl(Get)31 b(started)g(with)e Fj(BZ2_bzCompressInit)
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(calls)e(of)h Fj(BZ2_)330 3884 y(bzCompress)28 b Fl(with)h(action)h(=)g
Fj(BZ_RUN)p Fl(.)225 4030 y Fi(\017)60 b Fl(Finish)23
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Fl(with)i(action)h(=)g Fj(BZ_FINISH)p Fl(,)f(cop)m(ying)h(out)h(the)330
4139 y(compressed)k(output,)g(un)m(til)f Fj(BZ_STREAM_END)e
Fl(is)i(returned.)225 4285 y Fi(\017)60 b Fl(Close)30
b(up)f(and)h(go)h(home.)41 b(Call)29 b Fj(BZ2_bzCompressEnd)p
Fl(.)150 4478 y(If)23 b(the)h(data)h(y)m(ou)f(w)m(an)m(t)h(to)f
(compress)g(\014ts)f(in)m(to)h(y)m(our)g(input)e(bu\013er)h(all)f(at)j
(once,)h(y)m(ou)e(can)g(skip)f(the)h(calls)150 4588 y(of)37
b Fj(BZ2_bzCompress)26 b(\()k(...,)f(BZ_RUN)g(\))36 b
Fl(and)g(just)g(do)h(the)g Fj(BZ2_bzCompress)26 b(\()k(...,)f
(BZ_FINISH)150 4698 y(\))h Fl(calls.)150 4854 y(All)36
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150 4964 y(accept)g(an)m(y)f(data)h(at)g(all)d(\(ob)m(viously\).)51
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5183 y(y)m(our)e(programming.)150 5340 y(T)-8 b(rivial)28
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1153 y(P)m(ossible)g(return)h(v)-5 b(alues:)481 1304
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y(BZ_OK)120 b Fl(otherwise)150 1657 y Ff(3.3.4)63 b Fe
(BZ2_bzDecompressInit)390 1844 y Fj(int)47 b(BZ2_bzDecompressInit)42
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150 2220 y(a)h(custom)f(memory)g(allo)s(cator)g(is)g(required,)f(or)h
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Fl(/)p Fj(free)f Fl(routines.)150 2330 y(Up)s(on)h(return,)h(the)g(in)m
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Fj(total_in)f Fl(and)h Fj(total_out)f Fl(will)150 2439
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Fl(succeeds,)46 b(a)150 3458 y(subsequen)m(t)30 b Fj(BZ2_bzDecompress)c
Fl(could)j(fail)g(with)g Fj(BZ_MEM_ERROR)p Fl(.)150 3614
y(P)m(ossible)g(return)h(v)-5 b(alues:)572 3765 y Fj(BZ_CONFIG_ERROR)
663 3869 y Fl(if)29 b(the)i(library)d(has)i(b)s(een)f(mis-compiled)572
3973 y Fj(BZ_PARAM_ERROR)663 4077 y Fl(if)g Fj(\(small)46
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4284 y(BZ_MEM_ERROR)663 4388 y Fl(if)29 b(insu\016cien)m(t)g(memory)h
(is)f(a)m(v)-5 b(ailable)150 4545 y(Allo)m(w)m(able)30
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4800 y Fl(if)f Fj(BZ_OK)g Fl(w)m(as)i(returned)572 4904
y(no)f(sp)s(eci\014c)f(action)i(required)e(in)g(case)i(of)g(error)150
5153 y Ff(3.3.5)63 b Fe(BZ2_bzDecompress)390 5340 y Fj(int)47
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565 y(Before)g(eac)m(h)g(call)f(to)g Fj(BZ2_bzDecompress)p
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Fj(BZ2_)150 2289 y(bzDecompress)28 b Fl(will)g(not)j(pro)s(duce)f
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2774 y(release)31 b(memory)-8 b(.)150 2931 y(P)m(ossible)29
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3186 y Fl(if)29 b Fj(strm)g Fl(is)h Fj(NULL)f Fl(or)h
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b(<)j(1)572 3393 y(BZ_DATA_ERROR)663 3497 y Fl(if)29
b(a)i(data)g(in)m(tegrit)m(y)f(error)g(is)g(detected)h(in)e(the)i
(compressed)f(stream)572 3601 y Fj(BZ_DATA_ERROR_MAGIC)663
3705 y Fl(if)f(the)i(compressed)f(stream)g(do)s(esn't)h(b)s(egin)e
(with)g(the)h(righ)m(t)g(magic)h(b)m(ytes)572 3808 y
Fj(BZ_MEM_ERROR)663 3912 y Fl(if)e(there)i(w)m(asn't)f(enough)h(memory)
f(a)m(v)-5 b(ailable)572 4016 y Fj(BZ_STREAM_END)663
4120 y Fl(if)29 b(the)i(logical)e(end)h(of)h(the)f(data)h(stream)g(w)m
(as)g(detected)g(and)f(all)663 4224 y(output)g(in)f(has)h(b)s(een)g
(consumed,)f(eg)j Fj(s->avail_out)44 b(>)k(0)572 4327
y(BZ_OK)663 4431 y Fl(otherwise)150 4588 y(Allo)m(w)m(able)30
b(next)g(actions:)572 4739 y Fj(BZ2_bzDecompress)663
4843 y Fl(if)f Fj(BZ_OK)g Fl(w)m(as)i(returned)572 4946
y Fj(BZ2_bzDecompressEnd)663 5050 y Fl(otherwise)p eop
%%Page: 19 20
19 19 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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b Fe(BZ2_bzDecompressEnd)390 486 y Fj(int)47 b(BZ2_bzDecompressEnd)42
b(\()48 b(bz_stream)d(*strm)i(\);)150 643 y Fl(Releases)31
b(all)e(memory)h(asso)s(ciated)h(with)e(a)i(decompression)e(stream.)150
799 y(P)m(ossible)g(return)h(v)-5 b(alues:)572 950 y
Fj(BZ_PARAM_ERROR)663 1054 y Fl(if)29 b Fj(strm)g Fl(is)h
Fj(NULL)f Fl(or)h Fj(strm->s)f Fl(is)g Fj(NULL)572 1158
y(BZ_OK)663 1262 y Fl(otherwise)150 1419 y(Allo)m(w)m(able)h(next)g
(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 Fl(This)35 b(in)m(terface)j(pro)m(vides)d
(functions)h(for)g(reading)g(and)h(writing)e Fj(bzip2)g
Fl(format)i(\014les.)59 b(First,)39 b(some)150 2159 y(general)30
b(p)s(oin)m(ts.)225 2316 y Fi(\017)60 b Fl(All)35 b(of)h(the)g
(functions)e(tak)m(e)k(an)e Fj(int*)f Fl(\014rst)g(argumen)m(t,)j
Fj(bzerror)p Fl(.)56 b(After)36 b(eac)m(h)h(call,)g Fj(bzerror)330
2426 y Fl(should)23 b(b)s(e)i(consulted)g(\014rst)g(to)h(determine)e
(the)i(outcome)h(of)e(the)h(call.)38 b(If)25 b Fj(bzerror)f
Fl(is)g Fj(BZ_OK)p Fl(,)i(the)330 2535 y(call)35 b(completed)g
(successfully)-8 b(,)36 b(and)f(only)g(then)g(should)f(the)h(return)g
(v)-5 b(alue)35 b(of)h(the)f(function)g(\(if)330 2645
y(an)m(y\))30 b(b)s(e)f(consulted.)39 b(If)29 b Fj(bzerror)e
Fl(is)h Fj(BZ_IO_ERROR)p Fl(,)f(there)i(w)m(as)h(an)f(error)g
(reading/writing)e(the)330 2754 y(underlying)32 b(compressed)j(\014le,)
h(and)f(y)m(ou)h(should)d(then)i(consult)g Fj(errno)p
Fl(/)p Fj(perror)e Fl(to)j(determine)330 2864 y(the)i(cause)g(of)g(the)
g(di\016cult)m(y)-8 b(.)61 b Fj(bzerror)36 b Fl(ma)m(y)i(also)g(b)s(e)f
(set)h(to)g(v)-5 b(arious)37 b(other)h(v)-5 b(alues;)41
b(precise)330 2974 y(details)29 b(are)i(giv)m(en)g(on)f(a)h(p)s
(er-function)d(basis)h(b)s(elo)m(w.)225 3111 y Fi(\017)60
b Fl(If)40 b Fj(bzerror)f Fl(indicates)g(an)i(error)f(\(ie,)j(an)m
(ything)d(except)h Fj(BZ_OK)f Fl(and)g Fj(BZ_STREAM_END)p
Fl(\),)g(y)m(ou)330 3220 y(should)56 b(immediately)h(call)g
Fj(BZ2_bzReadClose)e Fl(\(or)j Fj(BZ2_bzWriteClose)p
Fl(,)j(dep)s(ending)56 b(on)330 3330 y(whether)50 b(y)m(ou)g(are)h
(attempting)g(to)g(read)f(or)g(to)i(write\))d(to)j(free)e(up)f(all)h
(resources)g(asso)s(ci-)330 3439 y(ated)33 b(with)e(the)i(stream.)47
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(of)i(all)e(calls)h(except)330 3549 y Fj(BZ2_bzReadClose)46
b Fl(\()p Fj(BZ2_bzWriteClose)p Fl(\))h(is)j(unde\014ned.)99
b(The)50 b(implication)e(is)i(that)h(\(1\))330 3659 y
Fj(bzerror)44 b Fl(should)g(b)s(e)h(c)m(hec)m(k)m(ed)j(after)e(eac)m(h)
h(call,)i(and)c(\(2\))i(if)e Fj(bzerror)f Fl(indicates)g(an)i(error,)
330 3768 y Fj(BZ2_bzReadClose)26 b Fl(\()p Fj(BZ2_bzWriteClose)p
Fl(\))h(should)h(then)i(b)s(e)g(called)g(to)h(clean)f(up.)225
3905 y Fi(\017)60 b Fl(The)33 b Fj(FILE*)f Fl(argumen)m(ts)h(passed)g
(to)h Fj(BZ2_bzReadOpen)p Fl(/)p Fj(BZ2_bzWriteOp)o(en)27
b Fl(should)32 b(b)s(e)g(set)i(to)330 4015 y(binary)23
b(mo)s(de.)38 b(Most)26 b(Unix)d(systems)i(will)d(do)i(this)g(b)m(y)g
(default,)i(but)e(other)g(platforms,)h(including)330
4124 y(Windo)m(ws)20 b(and)g(Mac,)k(will)19 b(not.)38
b(If)20 b(y)m(ou)h(omit)g(this,)h(y)m(ou)f(ma)m(y)h(encoun)m(ter)f
(problems)e(when)h(mo)m(ving)330 4234 y(co)s(de)31 b(to)g(new)f
(platforms.)225 4371 y Fi(\017)60 b Fl(Memory)23 b(allo)s(cation)f
(requests)h(are)g(handled)e(b)m(y)i Fj(malloc)p Fl(/)p
Fj(free)p Fl(.)36 b(A)m(t)23 b(presen)m(t)g(there)g(is)f(no)h(facilit)m
(y)330 4481 y(for)40 b(user-de\014ned)e(memory)i(allo)s(cators)g(in)f
(the)h(\014le)g(I/O)g(functions)e(\(could)i(easily)f(b)s(e)g(added,)330
4590 y(though\).)150 4842 y Ff(3.4.1)63 b Fe(BZ2_bzReadOpen)533
5029 y Fj(typedef)46 b(void)h(BZFILE;)533 5236 y(BZFILE)f
(*BZ2_bzReadOpen)e(\()j(int)g(*bzerror,)f(FILE)g(*f,)1726
5340 y(int)h(small,)f(int)h(verbosity,)p eop
%%Page: 20 21
20 20 bop 150 -116 a Fl(Chapter)30 b(3:)h(Programming)e(with)g
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(nUnused)g(\);)150 456 y Fl(Prepare)29 b(to)g(read)g(compressed)f(data)
i(from)e(\014le)g(handle)f Fj(f)p Fl(.)40 b Fj(f)29 b
Fl(should)d(refer)j(to)h(a)f(\014le)f(whic)m(h)f(has)i(b)s(een)150
565 y(op)s(ened)h(for)h(reading,)f(and)h(for)f(whic)m(h)g(the)h(error)g
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b(If)31 b Fj(small)e Fl(is)h(1,)150 675 y(the)h(library)d(will)f(try)j
(to)i(decompress)e(using)f(less)g(memory)-8 b(,)31 b(at)g(the)g(exp)s
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Fj(nUnused)e Fl(b)m(ytes)j(starting)f(at)150 941 y Fj(unused)p
Fl(,)k(b)s(efore)e(starting)h(to)g(read)g(from)f(the)h(\014le)f
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Fl(b)m(ytes)k(ma)m(y)h(b)s(e)150 1051 y(supplied)32 b(lik)m(e)k(this.)
55 b(If)36 b(this)e(facilit)m(y)h(is)g(not)h(required,)g(y)m(ou)g
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1160 y Fl(and)30 b(n)p Fj(Unused)e Fl(resp)s(ectiv)m(ely)-8
b(.)150 1317 y(F)g(or)31 b(the)g(meaning)e(of)i(parameters)g
Fj(small)e Fl(and)g Fj(verbosity)p Fl(,)f(see)j Fj
(BZ2_bzDecompressInit)p Fl(.)150 1474 y(The)k(amoun)m(t)g(of)g(memory)g
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(un)m(til)h(the)h(\014le's)150 1584 y(header)22 b(has)f(b)s(een)g
(read.)38 b(So)22 b(it)f(is)g(p)s(ossible)e(that)k Fj(BZ2_bzReadOpen)17
b Fl(returns)k Fj(BZ_OK)f Fl(but)h(a)i(subsequen)m(t)150
1693 y(call)30 b(of)g Fj(BZ2_bzRead)e Fl(will)f(return)j
Fj(BZ_MEM_ERROR)p Fl(.)150 1850 y(P)m(ossible)f(assignmen)m(ts)h(to)h
Fj(bzerror)p Fl(:)572 2001 y Fj(BZ_CONFIG_ERROR)663 2105
y Fl(if)e(the)i(library)d(has)i(b)s(een)f(mis-compiled)572
2209 y Fj(BZ_PARAM_ERROR)663 2313 y Fl(if)g Fj(f)h Fl(is)g
Fj(NULL)663 2416 y Fl(or)g Fj(small)f Fl(is)g(neither)h
Fj(0)g Fl(nor)g Fj(1)663 2520 y Fl(or)g Fj(\(unused)46
b(==)h(NULL)g(&&)g(nUnused)f(!=)h(0\))663 2624 y Fl(or)30
b Fj(\(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
Fl(if)29 b Fj(ferror\(f\))f Fl(is)h(nonzero)572 2935
y Fj(BZ_MEM_ERROR)663 3039 y Fl(if)g(insu\016cien)m(t)g(memory)h(is)f
(a)m(v)-5 b(ailable)572 3143 y Fj(BZ_OK)663 3247 y Fl(otherwise.)150
3403 y(P)m(ossible)29 b(return)h(v)-5 b(alues:)572 3554
y(P)m(oin)m(ter)31 b(to)g(an)f(abstract)h Fj(BZFILE)663
3658 y Fl(if)e Fj(bzerror)f Fl(is)i Fj(BZ_OK)572 3762
y(NULL)663 3866 y Fl(otherwise)150 4023 y(Allo)m(w)m(able)g(next)g
(actions:)572 4174 y Fj(BZ2_bzRead)663 4277 y Fl(if)f
Fj(bzerror)f Fl(is)i Fj(BZ_OK)572 4381 y(BZ2_bzClose)663
4485 y Fl(otherwise)150 4887 y Ff(3.4.2)63 b Fe(BZ2_bzRead)533
5074 y Fj(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 Fl(Reads)35
b(up)f(to)h Fj(len)f Fl(\(uncompressed\))h(b)m(ytes)g(from)f(the)h
(compressed)g(\014le)f Fj(b)g Fl(in)m(to)h(the)g(bu\013er)f
Fj(buf)p Fl(.)53 b(If)150 5340 y(the)30 b(read)f(w)m(as)h(successful,)f
Fj(bzerror)e Fl(is)i(set)h(to)g Fj(BZ_OK)e Fl(and)h(the)h(n)m(um)m(b)s
(er)e(of)i(b)m(ytes)g(read)f(is)g(returned.)p eop
%%Page: 21 22
21 21 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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(end-of-stream)h(w)m(as)g(detected,)i Fj(bzerror)31 b
Fl(will)g(b)s(e)h(set)i(to)g Fj(BZ_STREAM_END)p Fl(,)d(and)i(the)150
408 y(n)m(um)m(b)s(er)c(of)i(b)m(ytes)f(read)h(is)e(returned.)40
b(All)29 b(other)h Fj(bzerror)f Fl(v)-5 b(alues)29 b(denote)i(an)g
(error.)150 565 y Fj(BZ2_bzRead)37 b Fl(will)f(supply)h
Fj(len)i Fl(b)m(ytes,)j(unless)c(the)i(logical)f(stream)h(end)e(is)h
(detected)i(or)e(an)g(error)150 675 y(o)s(ccurs.)75 b(Because)43
b(of)f(this,)i(it)d(is)g(p)s(ossible)e(to)k(detect)g(the)f(stream)g
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b(of)h(b)m(ytes)g(returned)f(is)g(less)g(than)h(the)g(n)m(um)m(b)s(er)f
(requested.)40 b(Nev)m(ertheless,)31 b(this)e(is)g(regarded)150
894 y(as)38 b(inadvisable;)g(y)m(ou)g(should)d(instead)i(c)m(hec)m(k)i
Fj(bzerror)d Fl(after)i(ev)m(ery)g(call)e(and)h(w)m(atc)m(h)i(out)f
(for)f Fj(BZ_)150 1004 y(STREAM_END)p Fl(.)150 1160 y(In)m(ternally)-8
b(,)47 b Fj(BZ2_bzRead)41 b Fl(copies)j(data)g(from)g(the)g(compressed)
g(\014le)f(in)f(c)m(h)m(unks)i(of)g(size)g Fj(BZ_MAX_)150
1270 y(UNUSED)31 b Fl(b)m(ytes)i(b)s(efore)f(decompressing)f(it.)47
b(If)32 b(the)h(\014le)e(con)m(tains)i(more)g(b)m(ytes)g(than)f
(strictly)f(needed)150 1380 y(to)48 b(reac)m(h)f(the)g(logical)f
(end-of-stream,)52 b Fj(BZ2_bzRead)44 b Fl(will)g(almost)j(certainly)f
(read)h(some)g(of)g(the)150 1489 y(trailing)c(data)j(b)s(efore)e
(signalling)f Fj(BZ_SEQUENCE_END)p Fl(.)80 b(T)-8 b(o)46
b(collect)f(the)g(read)g(but)g(un)m(used)e(data)150 1599
y(once)29 b Fj(BZ_SEQUENCE_END)24 b Fl(has)k(app)s(eared,)g(call)f
Fj(BZ2_bzReadGetUnused)c Fl(immediately)j(b)s(efore)i
Fj(BZ2_)150 1708 y(bzReadClose)p Fl(.)150 1865 y(P)m(ossible)h
(assignmen)m(ts)h(to)h Fj(bzerror)p Fl(:)572 2016 y Fj(BZ_PARAM_ERROR)
663 2120 y Fl(if)e Fj(b)h Fl(is)g Fj(NULL)f Fl(or)h Fj(buf)g
Fl(is)f Fj(NULL)g Fl(or)i Fj(len)46 b(<)i(0)572 2224
y(BZ_SEQUENCE_ERROR)663 2328 y Fl(if)29 b Fj(b)h Fl(w)m(as)h(op)s(ened)
e(with)h Fj(BZ2_bzWriteOpen)572 2431 y(BZ_IO_ERROR)663
2535 y Fl(if)f(there)i(is)e(an)h(error)g(reading)g(from)g(the)g
(compressed)g(\014le)572 2639 y Fj(BZ_UNEXPECTED_EOF)663
2743 y Fl(if)f(the)i(compressed)f(\014le)f(ended)h(b)s(efore)g(the)g
(logical)g(end-of-stream)h(w)m(as)g(detected)572 2847
y Fj(BZ_DATA_ERROR)663 2950 y Fl(if)e(a)i(data)g(in)m(tegrit)m(y)f
(error)g(w)m(as)h(detected)h(in)d(the)h(compressed)g(stream)572
3054 y Fj(BZ_DATA_ERROR_MAGIC)663 3158 y Fl(if)f(the)i(stream)f(do)s
(es)g(not)h(b)s(egin)e(with)g(the)i(requisite)e(header)h(b)m(ytes)h
(\(ie,)f(is)g(not)663 3262 y(a)g Fj(bzip2)f Fl(data)i(\014le\).)61
b(This)28 b(is)i(really)f(a)i(sp)s(ecial)e(case)i(of)g
Fj(BZ_DATA_ERROR)p Fl(.)572 3365 y Fj(BZ_MEM_ERROR)663
3469 y Fl(if)e(insu\016cien)m(t)g(memory)h(w)m(as)h(a)m(v)-5
b(ailable)572 3573 y Fj(BZ_STREAM_END)663 3677 y Fl(if)29
b(the)i(logical)e(end)h(of)h(stream)f(w)m(as)h(detected.)572
3781 y Fj(BZ_OK)663 3884 y Fl(otherwise.)150 4041 y(P)m(ossible)e
(return)h(v)-5 b(alues:)572 4192 y(n)m(um)m(b)s(er)29
b(of)h(b)m(ytes)h(read)663 4296 y(if)e Fj(bzerror)f Fl(is)i
Fj(BZ_OK)f Fl(or)h Fj(BZ_STREAM_END)572 4400 y Fl(unde\014ned)663
4503 y(otherwise)150 4660 y(Allo)m(w)m(able)g(next)g(actions:)572
4811 y(collect)h(data)g(from)f Fj(buf)p Fl(,)f(then)h
Fj(BZ2_bzRead)e Fl(or)i Fj(BZ2_bzReadClose)663 4915 y
Fl(if)f Fj(bzerror)f Fl(is)i Fj(BZ_OK)572 5019 y Fl(collect)h(data)g
(from)f Fj(buf)p Fl(,)f(then)h Fj(BZ2_bzReadClose)d Fl(or)j
Fj(BZ2_bzReadGetUnused)663 5123 y Fl(if)f Fj(bzerror)f
Fl(is)i Fj(BZ_SEQUENCE_END)572 5226 y(BZ2_bzReadClose)663
5330 y Fl(otherwise)p eop
%%Page: 22 23
22 22 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29
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b Fe(BZ2_bzReadGetUnused)533 486 y Fj(void)47 b(BZ2_bzReadGetUnused)42
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(needed)e(to)i(get)g(to)g(the)150 856 y(logical)k(end-of-stream.)78
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Fj(BZ_MAX_UNUSED)d Fl(inclusiv)m(e.)150 1122 y(This)d(function)h(ma)m
(y)h(only)g(b)s(e)f(called)g(once)i Fj(BZ2_bzRead)c Fl(has)j(signalled)
e Fj(BZ_STREAM_END)e Fl(but)j(b)s(efore)150 1232 y Fj(BZ2_bzReadClose)p
Fl(.)150 1389 y(P)m(ossible)k(assignmen)m(ts)h(to)h Fj(bzerror)p
Fl(:)572 1540 y Fj(BZ_PARAM_ERROR)663 1644 y Fl(if)e
Fj(b)h Fl(is)g Fj(NULL)663 1747 y Fl(or)g Fj(unused)f
Fl(is)g Fj(NULL)g Fl(or)i Fj(nUnused)d Fl(is)i Fj(NULL)572
1851 y(BZ_SEQUENCE_ERROR)663 1955 y Fl(if)f Fj(BZ_STREAM_END)e
Fl(has)j(not)h(b)s(een)e(signalled)663 2059 y(or)h(if)f
Fj(b)h Fl(w)m(as)h(op)s(ened)f(with)f Fj(BZ2_bzWriteOpen)542
2162 y(BZ_OK)663 2266 y Fl(otherwise)150 2423 y(Allo)m(w)m(able)h(next)
g(actions:)572 2574 y Fj(BZ2_bzReadClose)150 2882 y Ff(3.4.4)63
b Fe(BZ2_bzReadClose)533 3068 y Fj(void)47 b(BZ2_bzReadClose)c(\()48
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b(all)e(memory)h(p)s(ertaining)e(to)i(the)h(compressed)f(\014le)f
Fj(b)p Fl(.)54 b Fj(BZ2_bzReadClose)31 b Fl(do)s(es)k(not)h(call)150
3335 y Fj(fclose)c Fl(on)h(the)h(underlying)d(\014le)h(handle,)h(so)h
(y)m(ou)g(should)e(do)h(that)h(y)m(ourself)f(if)g(appropriate.)49
b Fj(BZ2_)150 3445 y(bzReadClose)27 b Fl(should)i(b)s(e)g(called)h(to)h
(clean)f(up)g(after)h(all)e(error)h(situations.)150 3601
y(P)m(ossible)f(assignmen)m(ts)h(to)h Fj(bzerror)p Fl(:)572
3752 y Fj(BZ_SEQUENCE_ERROR)663 3856 y Fl(if)e Fj(b)h
Fl(w)m(as)h(op)s(ened)e(with)h Fj(BZ2_bzOpenWrite)572
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b(<)k(1)30 b Fl(or)g Fj(blockSize100k)44 b(>)k(9)663
2254 y Fl(or)30 b Fj(verbosity)45 b(<)j(0)30 b Fl(or)g
Fj(verbosity)45 b(>)j(4)663 2357 y Fl(or)30 b Fj(workFactor)45
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b(char*)428 b(dest,)2108 3640 y(unsigned)46 b(int*)g(destLen,)2108
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46 b(\);)150 4212 y Fl(A)m(ttempts)24 b(to)g(decompress)f(the)g(data)g
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y(of)21 b(the)g(uncompressed)e(data,)24 b(and)c Fj(BZ_OK)f
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Fl(is)g(assumed)h(to)h(hold)e(a)i(complete)f Fj(bzip2)f
Fl(format)i(data)g(stream.)150 4807 y Fj(BZ2_bzBuffToBuffDecompre)o(ss)
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y Fj(BZ_OK)663 2747 y Fl(otherwise)150 3116 y Fk(3.6)68
b Fd(zlib)43 b Fk(compatibilit)l(y)k(functions)150 3308
y Fl(Y)-8 b(oshiok)j(a)33 b(Tsuneo)e(has)h(con)m(tributed)g(some)g
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Fl(,)e Fj(BZ2_bzread)p Fl(,)h Fj(BZ2_bzwrite)p Fl(,)f
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3527 y(bzerror)23 b Fl(and)h Fj(BZ2_bzlibVersion)p Fl(.)34
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4674 y(Analogous)30 b(to)i Fj(fopen)c Fl(and)i Fj(fdopen)p
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y Fl(Reads/writes)30 b(data)h(from/to)g(a)g(previously)d(op)s(ened)i
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2512 y(BZ2_bzBuffToBuffCompress)o Fl(,)f Fj(BZ2_bzBuffToBuffDecompre)o
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