diff options
Diffstat (limited to 'lib/asn1/doc/src/asn1ct.xml')
| -rw-r--r-- | lib/asn1/doc/src/asn1ct.xml | 69 |
1 files changed, 22 insertions, 47 deletions
diff --git a/lib/asn1/doc/src/asn1ct.xml b/lib/asn1/doc/src/asn1ct.xml index 3be58cbc8e..9a9bb7ec1b 100644 --- a/lib/asn1/doc/src/asn1ct.xml +++ b/lib/asn1/doc/src/asn1ct.xml @@ -41,6 +41,19 @@ encode/decode functions. There are also some generic functions which can be used in during development of applications which handles ASN.1 data (encoded as BER or PER).</p> + <note> + <p>In R16, the options have been simplified. The back-end is chosen + using one of the options <c>ber</c>, <c>per</c>, or <c>uper</c>. + The options <c>optimize</c>, <c>nif</c>, and <c>driver</c> options + are no longer necessary (and the ASN.1 compiler will print a + warning if they are used). The options <c>ber_bin</c>, <c>per_bin</c>, + and <c>uper_bin</c> options will still work, but will print a warning. + </p> + <p>Another change in R16 is that the generated <c>encode/2</c> + function (and <c>asn1rt:encode/3</c>) always returns a binary. + The <c>encode/2</c> function for the BER back-end used to return + an iolist.</p> + </note> </description> <funcs> <func> @@ -50,9 +63,9 @@ <type> <v>Asn1module = atom() | string()</v> <v>Options = [Option| OldOption]</v> - <v>Option = ber_bin | per_bin | uper_bin | der | compact_bit_string | - noobj | {n2n, EnumTypeName} |{outdir, Dir} | {i, IncludeDir} | optimize | - nif | asn1config | undec_rest | {inline, OutputName} | inline | + <v>Option = ber | per | uper | der | compact_bit_string | + noobj | {n2n, EnumTypeName} |{outdir, Dir} | {i, IncludeDir} | + asn1config | undec_rest | {inline, OutputName} | inline | {macro_name_prefix, Prefix} | {record_name_prefix, Prefix} | verbose | warnings_as_errors</v> <v>OldOption = ber | per</v> <v>Reason = term()</v> @@ -112,7 +125,7 @@ File3.asn </pre> section in users guide</seealso>. Available options are: </p> <taglist> - <tag><c>ber | ber_bin | per | per_bin | uper_bin</c></tag> + <tag><c>ber | per | uper</c></tag> <item> <p> The encoding rule to be used. The supported encoding rules @@ -120,23 +133,12 @@ File3.asn </pre> PER aligned (Packed Encoding Rules) and PER unaligned. If the encoding rule option is omitted <c>ber</c> is the default. - The <c>per_bin</c> option means the aligned - variant. To use the unaligned variant the <c>uper_bin</c> - option has to be used. </p> <p> The generated Erlang module always gets the same name as the ASN.1 module and as a consequence of this only one encoding rule per ASN.1 module can be used at runtime. </p> - <p> - The <c>ber_bin</c> and <c>per_bin</c> options are - equivalent with the <c>OldOptions</c> <c>ber</c> and <c>per</c> - with the difference that the generated encoding/decoding - functions take advantage of the bit syntax, which in most - cases increases the performance considerably. The result - from encoding is a binary or an iolist. - </p> </item> <tag><c>der</c></tag> <item> @@ -144,7 +146,7 @@ File3.asn </pre> By this option the Distinguished Encoding Rules (DER) is chosen. DER is regarded as a specialized variant of the BER encoding rule, therefore the <c>der</c> option only makes sense together - with the <c>ber</c> or <c>ber_bin</c> option. + with the <c>ber</c> option. This option sometimes adds sorting and value checks when encoding, which implies a slower encoding. The decoding routines are the same @@ -206,28 +208,6 @@ Binary = binary() shall be placed. If omitted the files are placed in the current directory.</p> </item> - <tag><c>optimize</c></tag> - <item> - <p>This option is only valid together with one of the - <c>per_bin</c> - or <c>ber_bin</c> option. It gives time optimized code - generated and it uses another runtime module and - in the <c>per_bin</c> case a nif. The result - in the <c>per_bin</c> case from an encode when compiled - with this option will be a binary.</p> - </item> - <tag><c>driver</c></tag> - <item> - <p>As of R15B this means the same as the <c>nif</c> option. Kept for - backwards compatability reasons.</p> - </item> - <tag><c>nif</c></tag> - <item> - <p>Option valid together with <c>ber_bin</c> and <c>optimize</c> - options. It enables the use of several nifs that gives faster - encode and decode. Nifs are only enabled by the explicit use of - the option <c>nif</c></p> - </item> <tag><c>asn1config</c></tag> <item> <p>When one of the specialized decodes, exclusive or @@ -270,10 +250,6 @@ Binary = binary() <c>{export, [atom()]}</c> or <c>{export_all, true}</c> option are provided. The list of atoms are names of chosen asn1 specs from the <c>.set.asn</c> file. </p> - <p>When used together with <c>nif</c> for <c>ber_bin</c>, the - asn1 nifs will be used if the <c>asn1rt_nif</c> module is - available. If it is not available, a slower erlang fallback - will be used.</p> </item> <tag><c>inline</c></tag> <item> @@ -327,13 +303,12 @@ Binary = binary() <type> <v>Module = Type = atom()</v> <v>Value = term()</v> - <v>Bytes = [Int] when integer(Int), Int >= 0, Int =< 255</v> + <v>Bytes = binary()</v> <v>Reason = term()</v> </type> <desc> <p>Encodes <c>Value</c> of <c>Type</c> defined in the ASN.1 module - <c>Module</c>. Returns a list of bytes if successful. To get as fast execution as - possible the + <c>Module</c>. To get as fast execution as possible the encode function only performs rudimentary tests that the input <c>Value</c> is a correct instance of <c>Type</c>. The length of strings is for example @@ -348,10 +323,10 @@ Binary = binary() <type> <v>Module = Type = atom()</v> <v>Value = Reason = term()</v> - <v>Bytes = [Int] when integer(Int), Int >= 0, Int =< 255</v> + <v>Bytes = binary()</v> </type> <desc> - <p>Decodes <c>Type</c> from <c>Module</c> from the list of bytes + <p>Decodes <c>Type</c> from <c>Module</c> from the binary <c>Bytes</c>. Returns <c>{ok, Value}</c> if successful.</p> </desc> </func> |