V8unpack Cf

v8unpack-cf — read and write 1C binary artifacts

Two workflows live here, and they are not variants of one thing:

Use either when the 1C:Enterprise platform is not at hand. When the configuration lives in an infobase, extract it through the platform instead — see the getconfigfiles rule.

Dependency

• v8unpack Python package — pip install "v8unpack>=1.2.6,<2". Verify with python -m v8unpack --help.
• Both MCP servers declare it in their own requirements, so the tools work in a built image. When it is missing they answer status="error", error_code="dependency_missing" with the install line in hint — that is the answer, not a crash.

Ordinary forms — Form.bin

An ordinary form is not XML. In a Designer file export a managed form writes Forms/<Имя>/Ext/Form.xml; an ordinary form writes Forms/<Имя>/Ext/Form.bin — a 1C container holding two payload entries: form (the layout, a brace tree) and module (the form module, BSL). The sidecar Forms/<Имя>.xml declares which model it is, via <FormType>Ordinary</FormType>.

Find them with **/Forms/*/Ext/Form.bin. A form whose Form.xml appears to be "missing" is almost always an ordinary form, not a broken export.

The MCP contract — ordinary-form/1

The same two tools, with the same arguments and the same result payload, are published by 1c-code-metadata-mcp and 1c-graph-metadata-mcp. Learn them once. On the graph server the payload arrives in the envelope's data section; on the code server it is the result itself.

unpack_ordinary_form

Result: status, contract, tool, workspace_path, manifest_path, source (path / size / sha256), container, entries, entries_truncated, notes, warnings — plus structure / structure_truncated and module_text / module_truncated when include asks for them. Each entry carries name, kind (brace_tree / bsl_module / text / container / binary), size, sha256, encoding, deflated, path and decoded_path.

build_ordinary_form

Result: status, contract, tool, workspace_path, output_path, output (path / size / sha256), source, binary_identical, verified, verification (match / mismatch / skipped, with per-entry hashes), changed_entries, notes.

Errors

A refusal is status="error" with an error_code and an actionable hint. The codes: dependency_missing, path_invalid, path_not_found, not_a_file, not_a_container, unsupported_container_layout, workspace_not_empty, workspace_exists, workspace_invalid, manifest_missing, manifest_invalid, payload_missing, derived_edit_detected, output_exists, unpack_failed, build_failed, verify_failed.

The workspace

<workspace>/
  ordinary-form.json    # manifest: source, entries, hashes. Generated — never hand-edit.
  payload/
    form                # the layout brace tree, UTF-8 BOM + CRLF   <- SOURCE OF TRUTH
    module              # the form module, BSL, UTF-8 BOM + CRLF    <- SOURCE OF TRUTH
  decoded/
    form.json           # the layout as JSON-compatible data        <- derived, read-only
    module.bsl          # the module, for BSL tooling               <- derived, read-only

Edit payload/. decoded/ is regenerated on every unpack and is never read back. Editing a derived view and then building is refused with derived_edit_detected rather than silently dropped — but only that refusal saves the work, so do not rely on noticing.

Workflow — edit an ordinary form

# 1. Read it
unpack_ordinary_form(
    form_path="C:\src\Catalogs\Товары\Forms\Форма\Ext\Form.bin",
    workspace_path="C:\work\Форма")

# 2. Edit C:\work\Форма\payload\module (BSL) or payload\form (the layout tree).
#    Keep the UTF-8 BOM and the CRLF line endings.

# 3. Write it back, and prove nothing was lost
build_ordinary_form(
    workspace_path="C:\work\Форма",
    output_path="C:\src\Catalogs\Товары\Forms\Форма\Ext\Form.bin",
    overwrite=$true)

Check verification.status == "match". Then load the export into the infobase the normal way (/update1cbase) — this skill writes a file, it does not touch an infobase.

Paths with spaces or Cyrillic go in double quotes, always. In PowerShell prefer single-quoted literals ('C:\src\...\Form.bin') when the path contains $.

Warnings — read before the first call

• Form.bin is a binary 1C container, not a document. Never edit it directly, never read it as XML, never open it with an XML tool. A text editor corrupts it silently. It is one container: the reference ordinary form holds exactly two entries, form and module, stored verbatim. A file holding more than one container is a whole CF / CFE / EPF and is refused with unsupported_container_layout; an entry that is itself a container is kept whole rather than descended into, which is what keeps the round trip lossless.
• Do not judge a round trip by the final SHA-256. v8unpack stamps container records with the current time, so a rebuilt Form.bin differs byte for byte from its source even when nothing changed. binary_identical: false together with verification.status: "match" is the normal, correct outcome. The equality that means "nothing was lost" is the logical payload — entry names, sizes and SHA-256 — which is what verification reports.
• Preserve the workspace manifest and payload/. They are what a build reads. A workspace without ordinary-form.json is not a workspace (manifest_missing), and a missing payload entry is refused (payload_missing) rather than built around.
• A standalone Form.bin names nothing. Its brace tree is positional: it is structurally parseable, and no token in it says "this is a button called X". Do not invent element names, types or handlers from it. Named element trees (*.elem.json) come from high-level CF / CFE / EPF extraction, where the surrounding metadata supplies the names — and even there v8unpack 1.2.6 writes a populated tree only for managed forms (see Limitations).
• On Windows use --processes 1 for the CLI unless parallel processing has been validated for the artifact at hand. The MCP tools spawn no processes at all.
• Nothing is overwritten silently. An existing workspace needs overwrite=true; an existing output file needs overwrite=true; a non-empty directory the tool did not write is refused outright, overwrite or not.

Which route for a form

Whole binaries — CF / CFE / EPF

CLI commands

Extract (-E)

python -m v8unpack -E "<file.cf>" "<sources_dir>" --temp "<temp_dir>"

Build (-B)

python -m v8unpack -B "<sources_dir>" "<file.cf>"

Index (-I)

python -m v8unpack -I "<sources_dir>" --index index.json --core core

Generates / updates index.json — the table-of-contents file that controls how sources are laid out across subfolders.

Batch operations (-EA, -BA, -IA)

python -m v8unpack -EA products.json              # extract all products
python -m v8unpack -BA products.json              # build all products
python -m v8unpack -BA products.json --index KEY  # build a specific product

products.json describes several products with their individual build parameters.

Python API

import v8unpack

v8unpack.extract('d:/sample.cf', 'd:/src')
v8unpack.extract('d:/sample.cf', 'd:/src', temp_dir='d:/temp',
                 options={'descent': 4100200, 'auto_include': True})

v8unpack.build('d:/src', 'd:/repacked.cf')
v8unpack.build('d:/src', 'd:/repacked.cf', index='index.json',
               options={'descent': 4100200, 'version': '80306'})

Examples

Extract a configuration

python -m v8unpack -E "<project>/1Cv8.cf" "<project>/src" --temp "<project>/temp"

Build it back

python -m v8unpack -B "<project>/src" "<project>/1Cv8_new.cf"

Extract an external data processor

python -m v8unpack -E "MyDataProcessor.epf" "src_epf"

Extract an extension

python -m v8unpack -E "MyExtension.cfe" "src_cfe" --descent 3000112

Build an extension

python -m v8unpack -B "src_cfe" "bin/ext.cfe" --index cmd/index.json --descent 3000112 --version 80316

Version compatibility

The utility version is recorded in Configuration.json ("v8unpack": "1.2.6"). On build, major.minor must match. If the versions differ:

1. Build with the old version.
2. Upgrade the utility.
3. Re-extract with the new version.
4. Commit.

Intermediate stages (--temp)

Limitations

Of the CLI route:

• Object properties and form layout are stored in header / raw as raw arrays.
• Files larger than 1 MB (layouts, HTML) are stored as .bin without decoding.
• Encrypted modules are kept in binary form.
• With --auto_include, nested objects are sorted alphabetically.

Of ordinary forms specifically — measured on a real extraction (1C-Gitter 1.1.0.8, 170 form artifacts, v8unpack 1.2.6), not assumed:

• *.elem.json is populated for managed forms and empty for ordinary ones. 23 of 23 managed forms (Тип формы = 1) came back with a named tree; 147 of 147 ordinary forms (Тип формы = 0, element version '' or 0-5-1) came back empty, because neither version is in v8unpack's FormCore.supported_form_versions (0-26, 0-27, 1). So for the ordinary forms of a modern configuration the CLI route yields no named elements, and the layout has to be read from Form.bin — positionally.
• v8unpack 1.2.6 cannot write a container with compressed entries through Container.build(nested=False) — it raises struct.error, because Document.compress returns no table-of-contents offset. The MCP codec sidesteps this: it deflates an entry itself when the source stored it deflated, and writes the container with verbatim entries. Nothing to do at the call site; relevant only if you drive the library directly.
• A rebuilt binary's SHA-256 always differs from its source (write timestamps). See the warning above.

Relationship to other rules

• getconfigfiles — extracts configuration objects from a running infobase through the platform. Prefer it when an infobase is available; use v8unpack-cf when you only have a binary artifact and no platform.
• 1c-metadata-manage — MCP-based skill for operating on the metadata structure once the sources are unpacked. It owns managed forms (Ext/Form.xml); ordinary forms are this skill's, because there is no XML for it to edit.
• forms.md — the router for managed-form work. It sends ordinary forms here.
• mcp-1c-tools — the MCP catalog. unpack_ordinary_form / build_ordinary_form are listed there under both 1c-code-metadata-mcp and 1c-graph-metadata-mcp; this file is the contract they share.