| /* |
| * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. |
| * All rights reserved. |
| * |
| * This source code is licensed under both the BSD-style license (found in the |
| * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| * in the COPYING file in the root directory of this source tree). |
| * You may select, at your option, one of the above-listed licenses. |
| */ |
| |
| #ifndef DATA_H |
| #define DATA_H |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| typedef enum { |
| data_type_file = 1, /**< This data is a file. *.zst */ |
| data_type_dir = 2, /**< This data is a directory. *.tar.zst */ |
| } data_type_t; |
| |
| typedef struct { |
| char const* url; /**< Where to get this resource. */ |
| uint64_t xxhash64; /**< Hash of the url contents. */ |
| char const* path; /**< The path of the unpacked resource (derived). */ |
| } data_resource_t; |
| |
| typedef struct { |
| data_resource_t data; |
| data_resource_t dict; |
| data_type_t type; /**< The type of the data. */ |
| char const* name; /**< The logical name of the data (no extension). */ |
| } data_t; |
| |
| /** |
| * The NULL-terminated list of data objects. |
| */ |
| extern data_t const* const* data; |
| |
| |
| int data_has_dict(data_t const* data); |
| |
| /** |
| * Initializes the data module and downloads the data necessary. |
| * Caches the downloads in dir. We add a stamp file in the directory after |
| * a successful download. If a stamp file already exists, and matches our |
| * current data stamp, we will use the cached data without downloading. |
| * |
| * @param dir The directory to cache the downloaded data into. |
| * |
| * @returns 0 on success. |
| */ |
| int data_init(char const* dir); |
| |
| /** |
| * Must be called at exit to free resources allocated by data_init(). |
| */ |
| void data_finish(void); |
| |
| typedef struct { |
| uint8_t* data; |
| size_t size; |
| size_t capacity; |
| } data_buffer_t; |
| |
| /** |
| * Read the file that data points to into a buffer. |
| * NOTE: data must be a file, not a directory. |
| * |
| * @returns The buffer, which is NULL on failure. |
| */ |
| data_buffer_t data_buffer_get_data(data_t const* data); |
| |
| /** |
| * Read the dictionary that the data points to into a buffer. |
| * |
| * @returns The buffer, which is NULL on failure. |
| */ |
| data_buffer_t data_buffer_get_dict(data_t const* data); |
| |
| /** |
| * Read the contents of filename into a buffer. |
| * |
| * @returns The buffer, which is NULL on failure. |
| */ |
| data_buffer_t data_buffer_read(char const* filename); |
| |
| /** |
| * Create a buffer with the specified capacity. |
| * |
| * @returns The buffer, which is NULL on failure. |
| */ |
| data_buffer_t data_buffer_create(size_t capacity); |
| |
| /** |
| * Calls memcmp() on the contents [0, size) of both buffers. |
| */ |
| int data_buffer_compare(data_buffer_t buffer1, data_buffer_t buffer2); |
| |
| /** |
| * Frees an allocated buffer. |
| */ |
| void data_buffer_free(data_buffer_t buffer); |
| |
| typedef struct { |
| char* buffer; |
| char const** filenames; |
| unsigned size; |
| } data_filenames_t; |
| |
| /** |
| * Get a recursive list of filenames in the data object. If it is a file, it |
| * will only contain one entry. If it is a directory, it will recursively walk |
| * the directory. |
| * |
| * @returns The list of filenames, which has size 0 and NULL pointers on error. |
| */ |
| data_filenames_t data_filenames_get(data_t const* data); |
| |
| /** |
| * Frees the filenames table. |
| */ |
| void data_filenames_free(data_filenames_t filenames); |
| |
| typedef struct { |
| data_buffer_t const* buffers; |
| size_t size; |
| } data_buffers_t; |
| |
| /** |
| * @returns a list of buffers for every file in data. It is zero sized on error. |
| */ |
| data_buffers_t data_buffers_get(data_t const* data); |
| |
| /** |
| * Frees the data buffers. |
| */ |
| void data_buffers_free(data_buffers_t buffers); |
| |
| #endif |