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/*

* This file is part of the MicroPython project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2015 Paul Sokolovsky

* Copyright (c) 2016 Damien P. George

* Copyright (c) 2021 Jim Mussared

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

#include <string.h>

#include <stdint.h>

#include "py/lexer.h"

#include "py/frozenmod.h"

#if MICROPY_MODULE_FROZEN

// Null-separated frozen file names. All string-type entries are listed first,

// followed by mpy-type entries. Use mp_frozen_str_sizes to determine how

// many string entries.

extern const char mp_frozen_names[];

#if MICROPY_MODULE_FROZEN_STR

#ifndef MICROPY_MODULE_FROZEN_LEXER

#define MICROPY_MODULE_FROZEN_LEXER mp_lexer_new_from_str_len

#else

mp_lexer_t *MICROPY_MODULE_FROZEN_LEXER(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len);

#endif

// Size in bytes of each string entry, followed by a zero (terminator).

extern const uint32_t mp_frozen_str_sizes[];

// Null-separated string content.

extern const char mp_frozen_str_content[];

#endif // MICROPY_MODULE_FROZEN_STR

#if MICROPY_MODULE_FROZEN_MPY

#include "py/emitglue.h"

extern const mp_frozen_module_t *const mp_frozen_mpy_content[];

#endif // MICROPY_MODULE_FROZEN_MPY

// Search for "str" as a frozen entry, returning the stat result

// (no-exist/file/dir), as well as the type (none/str/mpy) and data.

// frozen_type can be NULL if its value isn't needed (and then data is assumed to be NULL).

mp_import_stat_t mp_find_frozen_module(const char *str, int *frozen_type, void **data) {

size_t len = strlen(str);

const char *name = mp_frozen_names;

if (frozen_type != NULL) {

*frozen_type = MP_FROZEN_NONE;

}

// Count the number of str lengths we have to find how many str entries.

size_t num_str = 0;

#if MICROPY_MODULE_FROZEN_STR && MICROPY_MODULE_FROZEN_MPY

for (const uint32_t *s = mp_frozen_str_sizes; *s != 0; ++s) {

++num_str;

}

#endif

for (size_t i = 0; *name != 0; i++) {

size_t entry_len = strlen(name);

if (entry_len >= len && memcmp(str, name, len) == 0) {

// Query is a prefix of the current entry.

if (entry_len == len) {

// Exact match --> file.

if (frozen_type != NULL) {

#if MICROPY_MODULE_FROZEN_STR

if (i < num_str) {

*frozen_type = MP_FROZEN_STR;

// Use the size table to figure out where this index starts.

size_t offset = 0;

for (size_t j = 0; j < i; ++j) {

offset += mp_frozen_str_sizes[j] + 1;

}

size_t content_len = mp_frozen_str_sizes[i];

const char *content = &mp_frozen_str_content[offset];

// Note: str & len have been updated by find_frozen_entry to strip

// the ".frozen/" prefix (to avoid this being a distinct qstr to

// the original path QSTR in frozen_content.c).

qstr source = qstr_from_strn(str, len);

mp_lexer_t *lex = MICROPY_MODULE_FROZEN_LEXER(source, content, content_len, 0);

*data = lex;

}

#endif

#if MICROPY_MODULE_FROZEN_MPY

if (i >= num_str) {

*frozen_type = MP_FROZEN_MPY;

// Load the corresponding index as a raw_code, taking

// into account any string entries to offset by.

*data = (void *)mp_frozen_mpy_content[i - num_str];

}

#endif

}

return MP_IMPORT_STAT_FILE;

} else if (name[len] == '/') {

// Matches up to directory separator, this is a valid

// directory path.

return MP_IMPORT_STAT_DIR;

}

}

// Skip null separator.

name += entry_len + 1;

}

return MP_IMPORT_STAT_NO_EXIST;

}

#endif // MICROPY_MODULE_FROZEN