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# Module `iso-8583-packer`
The module is a library for creation, packing and unpacking ISO 8583 messages,
and also for messages in non-standard formats.
## Usage
The module is the source of the `&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.pom.JarNameContentGenerator",
"description": "Latest name and version of substitution-reporting artifact in Maven Central Repository",
"parameters": {
"url": "https://repo1.maven.org/maven2/com/credibledoc/iso-8583-packer/maven-metadata.xml",
"nameAndVersionSeparator": "-"
}
} &&endPlaceholder` library.
The library can be loaded from the [Maven Central Repository](https://mvnrepository.com/artifact/com.credibledoc/iso-8583-packer).
Example of Maven configuration in a `pom.xml` file
... some mandatory tags omitted
com.credibledociso-8583-packer&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.pom.JarNameContentGenerator",
"description": "Latest version of iso-8583-packer artifact in Maven Central Repository",
"parameters": {
"url": "https://repo1.maven.org/maven2/com/credibledoc/iso-8583-packer/maven-metadata.xml",
"versionOnly": "true"
}
} &&endPlaceholder
## Examples
### Fixed - length value without a tag
The code below will create a new instance of the [FieldBuilder](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/main/java/com/credibledoc/iso8583packer/FieldBuilder.java) with a single field.
The field will contain 2 bytes data in [BCD](https://en.wikipedia.org/wiki/Binary-coded_decimal) format.
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of fixed length BCD value definition",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/bcd/BcdBodyPackerTest.java",
"beginString": " FieldBuilder.builder(MsgFieldType.VAL)",
"endString": "defineBodyPacker(BcdBodyPacker.leftPadding0());",
"indentation": ""
}
} &&endPlaceholder
```
The field can be filled with data by [ValueHolder](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/main/java/com/credibledoc/iso8583packer/ValueHolder.java),
for example:
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of fixed length BCD value filling",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/bcd/BcdBodyPackerTest.java",
"beginString": " String value = \"123\";",
"endString": " .setValue(value);",
"indentation": " "
}
} &&endPlaceholder
```
The filled object can be packed to bytes
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of fixed length BCD value packing",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/bcd/BcdBodyPackerTest.java",
"beginString": " byte[] valueBytes = valueHolder.pack();",
"endString": " assertEquals(\"0123\", bytesHex);",
"indentation": " "
}
} &&endPlaceholder
```
The defined MsgField can be used for unpacking from bytes to an object
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of fixed length BCD value unpacking",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/bcd/BcdBodyPackerTest.java",
"beginString": " String packedHex = \"0456\";",
"endString": " assertEquals(expectedValue, unpackedValue);",
"indentation": " "
}
} &&endPlaceholder
```
You can find the complete example here: [BcdBodyPackerTest](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/bcd/BcdBodyPackerTest.java)
More complex message definition with inner subfields is described in the [complex-example.md](doc/complex-example.md) document.
## Field types
Every field contains a header (optional) and a body (mandatory), for example 02 01 03, where
* 02 is header `TAG`
* 01 is header `LEN`
* 03 is body `VAL`
The [FieldBuilder](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/main/java/com/credibledoc/iso8583packer/FieldBuilder.java)
is able to create different field types, with and without headers, see the [field-types.md](doc/field-types.md) document.
### `TAG` types and packers
The following page [tag-packer.md](doc/tag/tag-packer.md) describes some formats and types of `TAG` packers.
### `LEN` types and packers
The following [length-packer.md](doc/length/length-packer.md) page describes different `LEN` subfield types
and implementations of the `LengthPacker` interface.
### `VAL` types and packers
The following page [body-packer.md](doc/body/body-packer.md) contains description of different formats of body values.
### Masker
In a production environment it is necessary to mask private sensitive data before print it to a log file.
The following page [masker.md](doc/masking/masker.md) describes how to mask the data.
### Bitmap
The ISO 8583 standard uses [Bitmaps](https://en.wikipedia.org/wiki/ISO_8583#Bitmaps) for defining of field numbers placed on a message.
The following [bitmap-packer.md](doc/bitmap/bitmap-packer.md) page describes how to define and use bitmaps.
## Repeated fields
In some cases is required to repeat some values in messages, for example to send multiple products purchased by a customer.
The following example [repeated-tag-val.md](doc/repeated/repeated-tag-val.md)
explains how to pack and unpack multiple recurrent fields.
