Add support for larger integer ranges in per encode/decode

Encoding and decoding of integer ranges can now be done
with an upper bound larger than the previous limit of 16^10.
The new upper bound in per encoding and decodings for constrained
whole numbers is 2^2040 (close to 16^508) which is the limit if
the length field encoding in the encoding of a constrained
whole number is limited to a single octet.

Related support seq: seq12060

6 files changed, 107 insertions, 53 deletions

diff --git a/lib/asn1/src/asn1rt_per_bin.erl b/lib/asn1/src/asn1rt_per_bin.erl
index a124c7553d..4e0c12936c 100644
--- a/lib/asn1/src/asn1rt_per_bin.erl
+++ b/lib/asn1/src/asn1rt_per_bin.erl
@@ -18,7 +18,6 @@
 %%
 %%
 -module(asn1rt_per_bin).
-
 %% encoding / decoding of PER aligned
 
 -include("asn1_records.hrl").
@@ -57,7 +56,7 @@
 	 encode_NumericString/2, decode_NumericString/2,
 	 encode_ObjectDescriptor/2, decode_ObjectDescriptor/1
 	]).
--export([complete_bytes/1, getbits/2, getoctets/2]).
+-export([complete_bytes/1, getbits/2, getoctets/2, minimum_bits/1]).
 
 -define('16K',16384).
 -define('32K',32768).
@@ -695,21 +694,28 @@ encode_constrained_number({Lb,Ub},Val) when Val >= Lb, Ub >= Val ->
 	    {octets,[Val2]};
 	Range  =< 65536 ->
 	    {octets,<<Val2:16>>};
-	Range =< 16#1000000  ->
-	    Octs = eint_positive(Val2),
-	    [{bits,2,length(Octs)-1},{octets,Octs}];
-	Range =< 16#100000000  ->
-	    Octs = eint_positive(Val2),
-	    [{bits,2,length(Octs)-1},{octets,Octs}];
-	Range =< 16#10000000000  ->
-	    Octs = eint_positive(Val2),
-	    [{bits,3,length(Octs)-1},{octets,Octs}];
+	Range =< (1 bsl (255*8))  ->
+            Octs = binary:bin_to_list(binary:encode_unsigned(Val2)),
+            RangeOcts = binary:bin_to_list(binary:encode_unsigned(Range - 1)),
+            OctsLen = length(Octs),
+            RangeOctsLen = length(RangeOcts),
+            LengthBitsNeeded = minimum_bits(RangeOctsLen - 1),
+            [{bits, LengthBitsNeeded, OctsLen - 1}, {octets, Octs}];
 	true  ->
 	    exit({not_supported,{integer_range,Range}})
     end;
 encode_constrained_number(Range,Val) -> 
     exit({error,{asn1,{integer_range,Range,value,Val}}}).
 
+%% For some reason the minimum bits needed in the length field in encoding of
+%% constrained whole numbers must always be atleast 2?
+minimum_bits(N) when N < 4 -> 2;
+minimum_bits(N) when N < 8 -> 3;
+minimum_bits(N) when N < 16 -> 4;
+minimum_bits(N) when N < 32 -> 5;
+minimum_bits(N) when N < 64 -> 6;
+minimum_bits(N) when N < 128 -> 7;
+minimum_bits(_N) -> 8.
 
 decode_constrained_number(Buffer,{Lb,Ub}) ->
     Range = Ub - Lb + 1,
@@ -738,18 +744,12 @@ decode_constrained_number(Buffer,{Lb,Ub}) ->
 		getoctets(Buffer,1);
 	    Range  =< 65536 ->
 		getoctets(Buffer,2);
-	    Range =< 16#1000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,3}),
-		{Octs,Bytes3} = getoctets_as_list(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
-	    Range =< 16#100000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,4}),
-		{Octs,Bytes3} = getoctets_as_list(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
-	    Range =< 16#10000000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,5}),
-		{Octs,Bytes3} = getoctets_as_list(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
+            Range =< (1 bsl (255*8))  ->
+                OList = binary:bin_to_list(binary:encode_unsigned(Range - 1)),
+                RangeOctLen = length(OList),
+                {Len, Bytes} = decode_length(Buffer, {1, RangeOctLen}),
+                {Octs, RestBytes} = getoctets_as_list(Bytes, Len),
+                {binary:decode_unsigned(binary:list_to_bin(Octs)), RestBytes};
 	    true  ->
 		exit({not_supported,{integer_range,Range}})
 	end,
diff --git a/lib/asn1/src/asn1rt_per_bin_rt2ct.erl b/lib/asn1/src/asn1rt_per_bin_rt2ct.erl
index 750b59aba6..f2e93cf096 100644
--- a/lib/asn1/src/asn1rt_per_bin_rt2ct.erl
+++ b/lib/asn1/src/asn1rt_per_bin_rt2ct.erl
@@ -18,7 +18,6 @@
 %%
 %%
 -module(asn1rt_per_bin_rt2ct).
-
 %% encoding / decoding of PER aligned
 
 -include("asn1_records.hrl").
@@ -605,19 +604,13 @@ encode_constrained_number({Lb,Ub},Val) when Val >= Lb, Ub >= Val ->
 	Range  =< 65536 ->
 %	    Size = {octets,<<Val2:16>>};
 	    [20,2,<<Val2:16>>];
-	Range =< 16#1000000  ->
-	    Octs = eint_positive(Val2),
-%	    [{bits,2,length(Octs)-1},{octets,Octs}];
-	    Len = length(Octs),
-	    [10,2,Len-1,20,Len,Octs];
-	Range =< 16#100000000  ->
-	    Octs = eint_positive(Val2),
-	    Len = length(Octs),
-	    [10,2,Len-1,20,Len,Octs];
-	Range =< 16#10000000000  ->
-	    Octs = eint_positive(Val2),
-	    Len = length(Octs),
-	    [10,3,Len-1,20,Len,Octs];
+	Range =< (1 bsl (255*8))  ->
+            Octs = binary:bin_to_list(binary:encode_unsigned(Val2)),
+            RangeOcts = binary:bin_to_list(binary:encode_unsigned(Range - 1)),
+            OctsLen = length(Octs),
+            RangeOctsLen = length(RangeOcts),
+            LengthBitsNeeded = asn1rt_per_bin:minimum_bits(RangeOctsLen - 1),
+            [10,LengthBitsNeeded,OctsLen-1,20,OctsLen,Octs];
 	true  ->
 	    exit({not_supported,{integer_range,Range}})
     end;
@@ -661,18 +654,12 @@ decode_constrained_number(Buffer,{Lb,_Ub},Range) ->
 		getoctets(Buffer,1);
 	    Range  =< 65536 ->
 		getoctets(Buffer,2);
-	    Range =< 16#1000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,3}),
-		{Octs,Bytes3} = getoctets_as_bin(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
-	    Range =< 16#100000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,4}),
-		{Octs,Bytes3} = getoctets_as_bin(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
-	    Range =< 16#10000000000  ->
-		{Len,Bytes2} = decode_length(Buffer,{1,5}),
-		{Octs,Bytes3} = getoctets_as_bin(Bytes2,Len),
-		{dec_pos_integer(Octs),Bytes3};
+            Range =< (1 bsl (255*8))  ->
+                OList = binary:bin_to_list(binary:encode_unsigned(Range - 1)),
+                RangeOctLen = length(OList),
+                {Len, Bytes} = decode_length(Buffer, {1, RangeOctLen}),
+                {Octs, RestBytes} = getoctets_as_bin(Bytes, Len),
+                {binary:decode_unsigned(Octs), RestBytes};
 	    true  ->
 		exit({not_supported,{integer_range,Range}})
 	end,
diff --git a/lib/asn1/test/asn1_SUITE.erl b/lib/asn1/test/asn1_SUITE.erl
index 3b9a7532c0..084e77f32f 100644
--- a/lib/asn1/test/asn1_SUITE.erl
+++ b/lib/asn1/test/asn1_SUITE.erl
@@ -773,6 +773,7 @@ per_open_type(Config, Rule, Opts) ->
 testConstraints(Config) -> test(Config, fun testConstraints/3).
 testConstraints(Config, Rule, Opts) ->
     asn1_test_lib:compile("Constraints", Config, [Rule|Opts]),
+    asn1_test_lib:compile("LargeConstraints", Config, [Rule|Opts]),
     testConstraints:int_constraints(Rule).
 
 
diff --git a/lib/asn1/test/asn1_SUITE_data/Constraints.py b/lib/asn1/test/asn1_SUITE_data/Constraints.py
index de48c4c2ca..dc65e7009a 100644
--- a/lib/asn1/test/asn1_SUITE_data/Constraints.py
+++ b/lib/asn1/test/asn1_SUITE_data/Constraints.py
@@ -7,6 +7,9 @@ SingleValue2 ::= INTEGER (1..20)
 Range2to19 ::= INTEGER (1<..<20)
 Range10to20 ::= INTEGER (10..20)
 ContainedSubtype ::= INTEGER (INCLUDES Range10to20)
+-- Some ranges for additional constrained number testing.
+LongLong ::= INTEGER (0..18446744073709551615)
+Range256to65536 ::= INTEGER (256..65536)
 FixedSize ::= OCTET STRING (SIZE(10)) 
 FixedSize2 ::= OCTET STRING (SIZE(10|20)) 
 VariableSize ::= OCTET STRING (SIZE(1..10)) 
diff --git a/lib/asn1/test/asn1_SUITE_data/LargeConstraints.py b/lib/asn1/test/asn1_SUITE_data/LargeConstraints.py
new file mode 100644
index 0000000000..68c7616b62
--- /dev/null
+++ b/lib/asn1/test/asn1_SUITE_data/LargeConstraints.py
@@ -0,0 +1,9 @@
+LargeConstraints DEFINITIONS ::=
+BEGIN
+
+-- Maximum number that can be encoded as a constrained whole number: 1 bsl (255*8)
+-- The number of octets needed to represent a number cannot be more than 255
+-- As the length field is encoded as a 8-bit bitfield.
+RangeMax ::= INTEGER (1..126238304966058622268417487065116999845484776053576109500509161826268184136202698801551568013761380717534054534851164138648904527931605160527688095259563605939964364716019515983399209962459578542172100149937763938581219604072733422507180056009672540900709554109516816573779593326332288314873251559077853068444977864803391962580800682760017849589281937637993445539366428356761821065267423102149447628375691862210717202025241630303118559188678304314076943801692528246980959705901641444238894928620825482303431806955690226308773426829503900930529395181208739591967195841536053143145775307050594328881077553168201547776)
+
+END
diff --git a/lib/asn1/test/testConstraints.erl b/lib/asn1/test/testConstraints.erl
index 1ce68ec522..d32e99eaaf 100644
--- a/lib/asn1/test/testConstraints.erl
+++ b/lib/asn1/test/testConstraints.erl
@@ -52,8 +52,6 @@ int_constraints(Rules) ->
 		  ?line {error,_Reason2} =
 		      asn1_wrapper:encode('Constraints','SingleValue',1000)
 	  end,
-    
-
 
     %%==========================================================
     %% SingleValue2 ::=  INTEGER (1..20) 
@@ -86,8 +84,6 @@ int_constraints(Rules) ->
 		      asn1_wrapper:encode('Constraints','SingleValue',1000)
 	  end,
 
-
-
     %%==========================================================
     %% Range2to19 ::=  INTEGER (1<..<20) 
     %%==========================================================
@@ -116,7 +112,65 @@ int_constraints(Rules) ->
 		  ?line {error,_Reason6} =
 		      asn1_wrapper:encode('Constraints','Range2to19',20)
 	  end,
+
+    %%==========================================================
+    %% Tests for Range above 16^4 up to maximum supported by asn1 assuming the
+    %% octet length field is encoded on max 8 bits
+    %%==========================================================
+    LastNumWithoutLengthEncoding = 65536,
+    ?line {ok,BytesFoo} = asn1_wrapper:encode('Constraints','Range256to65536',
+                                              LastNumWithoutLengthEncoding),
+    ?line {ok,LastNumWithoutLengthEncoding} = 
+        asn1_wrapper:decode('Constraints','Range256to65536',lists:flatten(BytesFoo)),
+
+    FirstNumWithLengthEncoding = 65537,
+    ?line {ok,BytesBar} = asn1_wrapper:encode('LargeConstraints','RangeMax',
+                                              FirstNumWithLengthEncoding),
+    ?line {ok,FirstNumWithLengthEncoding} =
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesBar)),
+
+    FirstNumOver16_6 = 16777217,
+    ?line {ok, BytesBaz} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', FirstNumOver16_6),
+    ?line {ok, FirstNumOver16_6} = 
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesBaz)),
+    
+    FirstNumOver16_8 = 4294967297,
+    ?line {ok, BytesQux} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', FirstNumOver16_8),
+    ?line {ok, FirstNumOver16_8} = 
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesQux)),
+
+    FirstNumOver16_10 = 1099511627776,
+    ?line {ok, BytesBur} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', FirstNumOver16_10),
+    ?line {ok, FirstNumOver16_10} = 
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesBur)),
+
+    FirstNumOver16_10 = 1099511627776,
+    ?line {ok, BytesBur} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', FirstNumOver16_10),
+    ?line {ok, FirstNumOver16_10} =
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesBur)),
+
+    HalfMax = 1 bsl (128*8),
+    ?line {ok, BytesHalfMax} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', HalfMax),
+    ?line {ok, HalfMax} =
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesHalfMax)),
+
+    Max = 1 bsl (255*8),
+    ?line {ok, BytesMax} =
+        asn1_wrapper:encode('LargeConstraints','RangeMax', Max),
+    ?line {ok, Max} =
+        asn1_wrapper:decode('LargeConstraints','RangeMax',lists:flatten(BytesMax)),
     
+    %% Random number within longlong range
+    LongLong = 12672809400538808320,
+    ?line {ok, BytesLongLong} =
+        asn1_wrapper:encode('Constraints','LongLong', LongLong),
+    ?line {ok, LongLong} =
+        asn1_wrapper:decode('Constraints','LongLong',lists:flatten(BytesLongLong)),
 
     %%==========================================================
     %%  Constraint Combinations (Duboisson p. 285)