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Fix up a small mistake in the interface version checking logic.

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Mike Auty
2017-03-29 20:29:19 +01:00
parent dcc558717c
commit 0f9dbe3112
1 changed files with 7 additions and 2 deletions
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volatility/framework/symbols/intermed.py
+7 -2
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@@ -107,9 +107,14 @@ class IntermediateSymbolTable(interfaces.symbols.SymbolTableInterface):
return cls(context, config_path, name, isf_url, native_types)
def _closest_version(self, version, versions):
"""Determines the highest suitable handler for specified version format"""
"""Determines the highest suitable handler for specified version format
An interface version such as Current.Age.Revision means that (Current - Age) of the provider must be equal to that of the
consumer, and the provider (the JSON in this instance) must have a greater age (indicating that only additive
changes have been made) than the consumer (in this case, the file reader).
"""
supported, age, revision = [int(x) for x in version.split(".")]
supported_versions = [x for x in versions.keys() if x[0] == supported and x[1] >= age]
supported_versions = [x for x in versions.keys() if x[0] == (supported - age) and x[1] >= age]
if not supported_versions:
raise ValueError(
"No Intermediate Format interface versions support file interface version: {}".format(version))