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[libpng15] Imported from libpng-1.5.16beta06.tar

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This commit is contained in:
Glenn Randers-Pehrson
2013-05-12 12:01:18 -05:00
parent ae8174d9a3
commit bc92887b2d
54 changed files with 1264 additions and 690 deletions
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362
scripts/options.awk
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@@ -53,7 +53,7 @@ BEGIN{
comment=start "/*" # Comment start
cend="*/" end # Comment end
def=start "#define PNG_" # Arbitrary define
sup="_SUPPORTED 1" end # end supported option
sup="_SUPPORTED" end # end supported option
und=comment "#undef PNG_" # Unsupported option
une="_SUPPORTED" cend # end unsupported option
error=start "ERROR:" # error message, terminate with 'end'
@@ -64,11 +64,15 @@ BEGIN{
logunsupported=0 # write unsupported options too
# Precreate arrays
# for each option:
option[""] = "" # list of all options: default enabled/disabled
done[""] = 1 # marks option as having been output
requires[""] = "" # requires by option
iffs[""] = "" # if by option
enabledby[""] = "" # options that enable it by option
sets[""] = "" # settings set by each option
setval[""] = "" # value to set (indexed: 'option sets[option]')
# for each setting:
setting[""] = "" # requires by setting
defaults[""] = "" # used for a defaulted value
doneset[""] = 1 # marks setting as having been output
@@ -200,7 +204,7 @@ $1 == "com"{
if (NF > 1) {
# sub(/^[ ]*com[ ]*/, "")
$1 = ""
print comment, $0, cend >out
print comment $0, cend >out
} else
print start end >out
next
@@ -237,7 +241,9 @@ $1 == "file" && NF >= 2{
next
}
# option NAME ( (requires|enables|if) NAME* | on | off | disabled )*
# option NAME ( (requires|enables|if) NAME* | on | off | disabled |
# sets SETTING VALUE+ )*
#
# Declares an option 'NAME' and describes its default setting (disabled)
# and its relationship to other options. The option is disabled
# unless *all* the options listed after 'requires' are set and at
@@ -252,95 +258,152 @@ $1 == "file" && NF >= 2{
# be later) entry may turn an option on or off explicitly.
$1 == "option" && NF >= 2{
onoff = option[$2] # records current (and the default is "", enabled)
opt = $2
sub(/,$/,"",opt)
onoff = option[opt] # records current (and the default is "", enabled)
key = ""
for (i=3; i<=NF; ++i) {
if ($(i) == "on" || $(i) == "off" || $(i) == "disabled") {
key = ""
if (onoff != $(i)) {
# on or off can zap disabled or enabled:
if (onoff == "" || (onoff == "disabled" || onoff == "enabled") && ($(i) == "on" || $(i) == "off")) {
# It's easy to mis-spell the option when turning it
# on or off, so warn about it here:
if (onoff == "" && ($(i) == "on" || $(i) == "off")) {
print $2 ": ERROR: turning unrecognized option", $(i)
# For the moment error out - it is safer
err = 1 # prevent END{} running
exit 1
}
onoff = $(i)
} else {
# Print a message, otherwise the error
# below is incomprehensible
print $2 ": currently", onoff ": attempt to turn", $(i)
break
}
istart = 3
do {
if (istart == 1) { # continuation line
val = getline
if (val != 1) { # error reading it
if (val == 0)
print "option", opt ": ERROR: missing contination line"
else
print "option", opt ": ERROR: error reading continuation line"
# This is a hard error
err = 1 # prevent END{} running
exit 1
}
} else if ($(i) == "requires" || $(i) == "if" || $(i) == "enables") {
key = $(i)
} else if (key == "requires") {
requires[$2] = requires[$2] " " $(i)
} else if (key == "if") {
iffs[$2] = iffs[$2] " " $(i)
} else if (key == "enables") {
enabledby[$(i)] = enabledby[$(i)] " " $2
} else
break # bad line format
}
}
for (i=istart; i<=NF; ++i) {
val=$(i)
sub(/,$/,"",val)
if (val == "on" || val == "off" || val == "disabled") {
key = ""
if (onoff != val) {
# on or off can zap disabled or enabled:
if (onoff == "" || (onoff == "disabled" || onoff == "enabled") &&
(val == "on" || val == "off")) {
# It's easy to mis-spell the option when turning it
# on or off, so warn about it here:
if (onoff == "" && (val == "on" || val == "off")) {
print "option", opt ": ERROR: turning unrecognized option", val
# For the moment error out - it is safer
err = 1 # prevent END{} running
exit 1
}
onoff = val
} else {
# Print a message, otherwise the error
# below is incomprehensible
print "option", opt ": currently", onoff ": attempt to turn", val
break
}
}
} else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
key = val
} else if (key == "requires") {
requires[opt] = requires[opt] " " val
} else if (key == "if") {
iffs[opt] = iffs[opt] " " val
} else if (key == "enables") {
enabledby[val] = enabledby[val] " " opt
} else if (key == "sets") {
sets[opt] = sets[opt] " " val
key = "setval"
set = val
} else if (key == "setval") {
setval[opt " " set] = setval[opt " " set] " " val
} else
break # bad line format
}
istart = 1
} while (i > NF && $0 ~ /,$/)
if (i > NF) {
# Set the option, defaulting to 'enabled'
if (onoff == "") onoff = "enabled"
option[$2] = onoff
option[opt] = onoff
next
}
# Else fall through to the error handler
}
# chunk NAME [requires OPT] [on|off|disabled]
# chunk NAME [requires OPT] [enables LIST] [on|off|disabled]
# Expands to the 'option' settings appropriate to the reading and
# writing of an ancilliary PNG chunk 'NAME':
#
# option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]
# option READ_NAME enables NAME
# option READ_NAME enables NAME LIST
# [option READ_NAME off]
# option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]
# option WRITE_NAME enables NAME
# option WRITE_NAME enables NAME LIST
# [option WRITE_NAME off]
pre != 0 && $1 == "chunk" && NF >= 2{
# 'chunk' is handled on the first pass by writing appropriate
# 'option' lines into the intermediate file.
opt = $2
sub(/,$/,"",opt)
onoff = ""
reqread = ""
reqwrite = ""
i = 3 # indicates format error
if (NF > 2) {
enables = ""
req = 0
istart = 3
do {
if (istart == 1) { # continuation line
val = getline
if (val != 1) { # error reading it
if (val == 0)
print "chunk", opt ": ERROR: missing contination line"
else
print "chunk", opt ": ERROR: error reading continuation line"
# This is a hard error
err = 1 # prevent END{} running
exit 1
}
}
# read the keywords/additional OPTS
req = 0
for (i=3; i<=NF; ++i) {
if ($(i) == "on" || $(i) == "off" || $(i) == "disabled") {
if (onoff != $(i)) {
for (i=istart; i<=NF; ++i) {
val = $(i)
sub(/,$/,"",val)
if (val == "on" || val == "off" || val == "disabled") {
if (onoff != val) {
if (onoff == "")
onoff = $(i)
onoff = val
else
break # on/off conflict
}
} else if ($(i) == "requires")
req = 0
} else if (val == "requires")
req = 1
else if (req != 1)
else if (val == "enables")
req = 2
else if (req == 1){
reqread = reqread " READ_" val
reqwrite = reqwrite " WRITE_" val
} else if (req == 2)
enables = enables " " val
else
break # bad line: handled below
else {
reqread = reqread " READ_" $(i)
reqwrite = reqwrite " WRITE_" $(i)
}
}
}
istart = 1
} while (i > NF && $0 ~ /,$/)
if (i > NF) {
# Output new 'option' lines to the intermediate file (out)
print "option READ_" $2, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", $2, onoff >out
print "option WRITE_" $2, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", $2, onoff >out
print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out
print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out
next
}
# Else hit the error handler below - bad line format!
@@ -471,83 +534,7 @@ END{
exit 0
}
# Do the 'setting' values first, the algorithm the standard
# tree walk (O(1)) done in an O(2) while/for loop; interations
# settings x depth, outputing the deepest required macros
# first.
print "" >out
print "/* SETTINGS */" >out
print comment, "settings", cend >out
# Sort (in dfn.awk) on field 2, the setting name
print "PNG_DFN_START_SORT 2" >out
finished = 0
while (!finished) {
finished = 1
movement = 0 # done nothing
for (i in setting) if (!doneset[i]) {
nreqs = split(setting[i], r)
if (nreqs > 0) {
for (j=1; j<=nreqs; ++j) if (!doneset[r[j]]) {
break
}
if (j<=nreqs) {
finished = 0
continue # try a different setting
}
}
# All the requirements have been processed, output
# this setting.
if (deb) print "setting", i
deflt = defaults[i]
# A leading @ means leave it unquoted so the preprocessor
# can substitute the build time value
if (deflt ~ /^ @/)
deflt = " " subs substr(deflt, 3) sube
# Remove any spurious trailing spaces
sub(/ *$/,"",deflt)
print "" >out
print "/* setting: ", i >out
print " * requires:" setting[i] >out
print " * default: ", defaults[i] defltinfo, "*/" >out
if (defaults[i] == "") { # no default, only check if defined
print "#ifdef PNG_" i >out
}
for (j=1; j<=nreqs; ++j) {
print "# ifndef PNG_" r[j] >out
print error, i, "requires", r[j] end >out
print "# endif" >out
}
if (defaults[i] != "") { # default handling
print "#ifdef PNG_" i >out
}
# PNG_<i> is defined, so substitute the value:
print def i, subs "PNG_" i sube end >out
if (defaults[i] != "") {
print "#else /*default*/" >out
# And add the default definition for the benefit
# of later settings an options test:
print "# define PNG_" i deflt >out
print def i deflt end >out
}
print "#endif" >out
doneset[i] = 1
++movement
}
if (!finished && !movement) {
print "setting: loop or missing setting in 'requires', cannot process:"
for (i in setting) if (!doneset[i]) {
print " setting", i, "requires" setting[i]
}
exit 1
}
}
print "PNG_DFN_END_SORT" >out
print comment, "end of settings", cend >out
# Now do the options - somewhat more complex. The dependency
# Do the options first (allowing options to set settings). The dependency
# tree is thus:
#
# name > name
@@ -639,7 +626,7 @@ END{
}
if (err) exit 1
# Sort options too
# Sort options:
print "PNG_DFN_START_SORT 2" >out
# option[i] is now the complete list of all the tokens we may
@@ -679,8 +666,9 @@ END{
print "" >out
print "/* option:", i, option[i] >out
print " * requires: " requires[i] >out
print " * if: " iffs[i] >out
print " * enabled-by:" enabledby[i], "*/" >out
print " * if: " iffs[i] >out
print " * enabled-by:" enabledby[i] >out
print " * sets: " sets[i], "*/" >out
print "#undef PNG_on" >out
print "#define PNG_on 1" >out
@@ -763,6 +751,21 @@ END{
print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
} else if (i !~ /^ok_/) {
print def i sup >out
# Supported option, set required settings
nreqs = split(sets[i], r)
for (j=1; j<=nreqs; ++j) {
print "# ifdef PNG_set_" r[j] >out
# Some other option has already set a value:
print error, i, "sets", r[j] ": duplicate setting" end >out
print error, " previous value: " end "PNG_set_" r[j] >out
print "# else" >out
# Else set the default: note that this won't accept arbitrary
# values, the setval string must be acceptable to all the C
# compilers we use. That means it must be VERY simple; a number,
# a name or a string.
print "# define PNG_set_" r[j], setval[i " " r[j]] >out
print "# endif" >out
}
}
print "# endif /* definition */" >out
print "#endif /*requires, if*/" >out
@@ -796,6 +799,93 @@ END{
print "PNG_DFN_END_SORT" >out
print comment, "end of options", cend >out
# Do the 'setting' values second, the algorithm the standard
# tree walk (O(1)) done in an O(2) while/for loop; interations
# settings x depth, outputing the deepest required macros
# first.
print "" >out
print "/* SETTINGS */" >out
print comment, "settings", cend >out
# Sort (in dfn.awk) on field 2, the setting name
print "PNG_DFN_START_SORT 2" >out
finished = 0
while (!finished) {
finished = 1
movement = 0 # done nothing
for (i in setting) if (!doneset[i]) {
nreqs = split(setting[i], r)
if (nreqs > 0) {
# By default assume the requires values are options, but if there
# is no option with that name check for a setting
for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
break
}
if (j<=nreqs) {
finished = 0
continue # try a different setting
}
}
# All the requirements have been processed, output
# this setting.
if (deb) print "setting", i
deflt = defaults[i]
# Remove any spurious trailing spaces
sub(/ *$/,"",deflt)
# A leading @ means leave it unquoted so the preprocessor
# can substitute the build time value
if (deflt ~ /^ @/)
deflt = " " subs substr(deflt, 3) sube
print "" >out
print "/* setting: ", i >out
print " * requires:" setting[i] >out
print " * default: ", defaults[i] deflt, "*/" >out
for (j=1; j<=nreqs; ++j) {
if (option[r[j]] != "")
print "#ifndef PNG_" r[j] "_SUPPORTED" >out
else
print "#ifndef PNG_" r[j] >out
print error, i, "requires", r[j] end >out
print "# endif" >out
}
# The precedence is:
#
# 1) External definition; trumps:
# 2) Option 'sets' value; trumps:
# 3) Setting 'default'
#
print "#ifdef PNG_" i >out
# PNG_<i> is defined, so substitute the value:
print def i, subs "PNG_" i sube end >out
print "#else /* use default */" >out
print "# ifdef PNG_set_" i >out
# Value from an option 'sets' argument
print def i, subs "PNG_set_" i sube end >out
# This is so that subsequent tests on the setting work:
print "# define PNG_" i, "1" >out
if (defaults[i] != "") {
print "# else /*default*/" >out
print def i deflt end >out
print "# define PNG_" i, "1" >out
}
print "# endif /* defaults */" >out
print "#endif /* setting", i, "*/" >out
doneset[i] = 1
++movement
}
if (!finished && !movement) {
print "setting: loop or missing setting in 'requires', cannot process:"
for (i in setting) if (!doneset[i]) {
print " setting", i, "requires" setting[i]
}
exit 1
}
}
print "PNG_DFN_END_SORT" >out
print comment, "end of settings", cend >out
# Regular end - everything looks ok
if (protect != "") {
print start "#endif", "/*", protect, "*/" end >out