69 lines
3.1 KiB
Markdown
69 lines
3.1 KiB
Markdown
# File Archives & Archivers
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ENiGMA½ can detect and process various archive formats such as zip and arj for a variety of tasks from file upload processing to EchoMail bundle compress/decompression. The `archives` section of `config.hjson` is used to override defaults, add new handlers, and so on.
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## Archivers
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Archivers are manged via the `archives:archivers` configuration block of `config.hjson`. Each entry in this section defines an **external archiver** that can be referenced in other sections of `config.hjson` as and in code. Entries define how to `compress`, `decompress` (a full archive), `list`, and `extract` (specific files from an archive).
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### Predefined Archivers
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The following archivers are pre-configured in ENiGMA½ as of this writing. Remember that you can override settings or add new handlers!
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#### ZZip
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* Formats: .7z, .bzip2, .zip, .gzip/.gz, and more
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* Key: `7Zip`
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* Homepage/package: [7-zip.org](http://www.7-zip.org/). Generally obtained from a `p7zip` package in *nix environments. See http://p7zip.sourceforge.net/ for details.
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#### Lha
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* Formats: <a href="https://en.wikipedia.org/wiki/LHA_(file_format)">LHA</a> files such as .lzh.
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* Key: `Lha`
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* Homepage/package: `lhasa` on most *nix environments. See also https://fragglet.github.io/lhasa/
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#### Arj
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* Formats: .arj
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* Key: `Arj`
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* Homepage/package: `arj` on most *nix environments.
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### Archiver Configuration
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Archiver entries in `config.hjson` are mostly self explanatory with the exception of `list` commands that require some additional information. The `args` member for an entry is an array of arguments to pass to `cmd`. Some variables are available to `args` that will be expanded by the system:
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* `{archivePath}` (all): Path to the archive
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* `{fileList}` (compress, extract): List of file(s) to compress or extract
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* `{extractPath}` (decompress, extract): Path to extract *to*
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For `list` commands, the `entryMatch` key must be provided. This key should provide a regular expression that matches two sub groups: One for uncompressed file byte sizes (sub group 1) and the other for file names (sub group 2). An optional `entryGroupOrder` can be supplied to change the default sub group order.
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#### Example Archiver Configuration
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```
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7Zip: {
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compress: {
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cmd: 7za,
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args: [ "a", "-tzip", "{archivePath}", "{fileList}" ]
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}
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decompress: {
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cmd: 7za,
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args: [ "e", "-o{extractPath}", "{archivePath}" ]
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}
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list: {
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cmd: 7za,
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args: [ "l", "{archivePath}" ]
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entryMatch: "^[0-9]{4}-[0-9]{2}-[0-9]{2}\\s[0-9]{2}:[0-9]{2}:[0-9]{2}\\s[A-Za-z\\.]{5}\\s+([0-9]+)\\s+[0-9]+\\s+([^\\r\\n]+)$",
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}
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extract: {
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cmd: 7za,
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args [ "e", "-o{extractPath}", "{archivePath}", "{fileList}" ]
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}
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}
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```
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## Archive Formats
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Archive formats can be defined such that ENiGMA½ can detect them by signature or extension, then utilize the correct *archiver* to process them. Formats are defined in the `archives:formats` key in `config.hjson`. Many differnet types come pre-configured (see `core/config.js`).
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### Example Archive Format Configuration
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```
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zip: {
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sig: "504b0304" /* byte signature in HEX */
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offset: 0
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exts: [ "zip" ]
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handler: 7Zip /* points to a defined archiver */
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desc: "ZIP Archive"
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}
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``` |