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extmod: Add generic VFS sub-system.

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This provides mp_vfs_XXX functions (eg mount, open, listdir) which are
agnostic to the underlying filesystem type, and just require an object with
the relevant filesystem-like methods (eg .mount, .open, .listidr) which can
then be mounted.

These mp_vfs_XXX functions would typically be used by a port to implement
the "uos" module, and mp_vfs_open would be the builtin open function.

This feature is controlled by MICROPY_VFS, disabled by default.
This commit is contained in:
Damien George
2017-01-27 15:10:09 +11:00
parent 32a1138b9f
commit dcb9ea7215
9 changed files with 492 additions and 1 deletions
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10
py/mpconfig.h
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@@ -398,6 +398,11 @@
#define MICROPY_READER_POSIX (0)
#endif
// Whether to use the VFS reader for importing files
#ifndef MICROPY_READER_VFS
#define MICROPY_READER_VFS (0)
#endif
// Whether to use the FatFS reader for importing files
#ifndef MICROPY_READER_FATFS
#define MICROPY_READER_FATFS (0)
@@ -621,6 +626,11 @@ typedef double mp_float_t;
#define MICROPY_FSUSERMOUNT (0)
#endif
// Support for generic VFS sub-system
#ifndef MICROPY_VFS
#define MICROPY_VFS (0)
#endif
/*****************************************************************************/
/* Fine control over Python builtins, classes, modules, etc */