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