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ce7b00f926
This is fifth iteration of typo fixes
590 lines
19 KiB
C
590 lines
19 KiB
C
#ifndef MOBI_DA_DAC_H
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#define MOBI_DA_DAC_H
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/**
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* @file dac.h
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* @author Afilias Technologies
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*
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* @brief API main header file
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*/
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#include <sys/types.h>
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#include <limits.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#ifndef __cplusplus
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#ifndef true
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#ifdef HAVE_NO_BUILTIN__BOOL
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typedef int _Bool;
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#endif
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#define bool _Bool
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#define true 1
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#define false 0
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#endif
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#endif
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#define MOBI_DA_MAJOR 2
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#define MOBI_DA_MINOR 1
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#define MOBI_DA_DUMMY_LIBRARY 1
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/**
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* @brief All values returned by the API have one of these types.
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* da_getprop*() return data in the appropriate C type for the given da_type.
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*/
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enum da_type {
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DA_TYPE_NONE,
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DA_TYPE_BOOLEAN,
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DA_TYPE_INTEGER,
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DA_TYPE_NUMBER,
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DA_TYPE_STRING,
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DA_TYPE_ARRAY,
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DA_TYPE_OBJECT,
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DA_TYPE_NULL
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};
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/**
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* Any method that returns a da_status may potentially fail for one of these reasons.
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* XXX: Error reporting needs to be improved.
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*/
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enum da_status {
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DA_OK, /* Success. */
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DA_INVALID_JSON, /* The JSON format is invalid, or the content is unexpected in a given context. */
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DA_OVERFLOW, /* Overflow occurred. Note this is used to indicate an unfinished string parse in JSON */
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DA_FORMAT_ERROR, /* The data supplied is formatted incorrectly. */
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DA_NOMEM, /* There was not enough space to complete the operation */
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DA_SYS, /* A system error occurred - consult the OS for more details (eg, check errno) */
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DA_NOTIMPL, /* This method is not implemented */
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DA_NOTFOUND, /* The requested item was not found. */
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DA_REGEXBAD, /* An invalid regex was provided. */
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DA_NOMORE, /* Used to indicate the end of an iterator. */
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DA_INVALID_COOKIE, /* Cookie value supplied was invalid */
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DA_INVALID_TYPE, /* A value of an unexpected type was found. */
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DA_INTERNAL_ERROR,
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DA_STATUS_LAST /* Placeholder to indicate highest possible error value. (value will change as API matures) */
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};
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enum da_severity {
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DA_SEV_FATAL, /* The operation will not continue, and the operation will return an error. */
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DA_SEV_ERROR, /* An error occurred, but the API call will return at least some valid information */
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DA_SEV_WARN, /* An unexpected event occurred, but the system dealt with it */
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DA_SEV_INFO /* An informational message. */
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};
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/* Forward references to tagged types */
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struct atlas_image;
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struct da_atlas;
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struct da_deviceinfo;
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struct da_jsonparser;
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struct da_node;
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struct da_propset;
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union da_value;
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struct da_evidence;
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struct da_bitset;
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struct da_allocator;
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struct da_config;
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/**
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* @brief Primary types of the interface.
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* Primary types used by API client.
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* Non-typedef structures and unions are considered private to the API.
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*
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*/
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typedef enum da_severity da_severity_t; /* A severity for the error callback. */
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typedef enum da_status da_status_t; /* An error code - returned from most API calls. */
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typedef da_status_t (*da_setpos_fn)(void *ctx, off_t off); /* callback provided to API to rewind input stream */
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typedef enum da_type da_type_t; /* A value type (integer, string, etc) */
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/**
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* @brief An operation on an atlas involves converting a set of evidence strings into a set of property/value pairs.
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* The ID for a particular type of evidence is extract from the atlas (eg, for a specific HTTP header, use:
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*
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* da_evidence_id_t evidence = da_atlas_header_evidence_id(atlas, "User-Agent");
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*
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*/
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typedef int da_evidence_id_t;
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/**
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* @brief The search result encompasses a key/value set. Keys are handles retrieved via
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* _either_ da_atlas_getpropid() or da_getpropid().
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* Some search results may have keys not available when the atlas is opened (eg,
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* when the name of the property itself is contained within the evidence)
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* Such properties by necessity are given a "local" da_propid_t
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*
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* You can ensure any properties you are interested in get a global propid by
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* passing a list of interesting named properties to da_atlas_open()
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*/
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typedef int da_propid_t;
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typedef size_t (*da_read_fn)(void *ctx, size_t maxlen, char *ptr);
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typedef struct da_atlas da_atlas_t;
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typedef struct da_deviceinfo da_deviceinfo_t;
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typedef struct da_evidence da_evidence_t;
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typedef struct da_jsonparser da_jsonparser_t;
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typedef struct da_node da_node_t;
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typedef struct da_property_decl da_property_decl_t;
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typedef struct da_propset da_propset_t;
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typedef struct da_config da_config_t;
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typedef void *(*da_alloc_fn)(void *ctx, size_t);
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typedef void (*da_free_fn)(void *ctx, void *);
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typedef void *(*da_realloc_fn)(void *ctx, void *, size_t);
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typedef void (*da_errorfunc_t)(da_severity_t severity, da_status_t status, const char *msg, va_list args);
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/* Manifest constants. */
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enum {
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/*
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* used as the initial guess for the compiled size of an atlas.
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* If atlas sizes grow more beyond this, it can be expanded to avoid multiple scans of the data.
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*/
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DA_INITIAL_MEMORY_ESTIMATE = 1024 * 1024 * 14
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};
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struct da_config {
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unsigned int ua_props;
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unsigned int lang_props;
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unsigned int __reserved[14]; /* enough reserved keywords for future use */
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};
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/**
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* Functional interface.
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*/
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/**
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* @brief Initialize process to use the DA API.
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*/
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void da_init(void);
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/**
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* @brief Release all resources used by the API
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*/
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void da_fini(void);
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/**
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* @brief User-supplied callback to be invoked with information about an error.
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* Note this may use thread-local storage etc to store the info on return from the current call
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* It is guaranteed that an error-reporting function returning an error-code will have called
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* this function at least once.
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* @param callback function
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*/
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void da_seterrorfunc(da_errorfunc_t callback);
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/**
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* @brief Given a specific HTTP header, return the associated ID for that header.
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* When passing evidence to the API, its type is identified using its da_evidince_id_t.
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* @param atlas atlas instance
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* @param header_name Header's name
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* @return evidence id
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*/
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da_evidence_id_t da_atlas_header_evidence_id(const da_atlas_t *atlas, const char *header_name);
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/**
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* @brief Return the associated ID of the client side properties evidence
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* @param atlas Atlas instance
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* @return evidence id
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*/
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da_evidence_id_t da_atlas_clientprop_evidence_id(const da_atlas_t *atlas);
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/**
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* @brief Return the associated ID of the accept language header evidence
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* @param atlas Atlas instance
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* @return evidence id
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*/
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da_evidence_id_t da_atlas_accept_language_evidence_id(const da_atlas_t *atlas);
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/**
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* @brief readfn should present JSON content from ctx.
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* atlasp points to an uninitialized da_atlas structure.
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* Result is a compiled atlas at atlasp.
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* Result is allocated via normal memory-allocation methods, malloc/calloc/realloc, so should be
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* Free'd with free()
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* XXX TODO: Change this to take a da_allocator
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* @param ctx pointer given to read the json file
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* @param readfn function pointer, set accordingly to the attended given pointer
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* @param setposfn function pointer
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* @param ptr Pointer dynamically allocated if the json parsing happened normally
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* @param len size of the atlas image
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* @return status of atlas compilation
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*/
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da_status_t da_atlas_compile(void *ctx, da_read_fn readfn, da_setpos_fn setposfn, void **ptr, size_t *len);
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/**
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* @brief opens a previously compiled atlas for operations. extra_props will be available in calls to
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* da_getpropid on the atlas, and if generated by the search, the ID will be consistent across
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* different calls to search.
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* Properties added by a search that are neither in the compiled atlas, nor in the extra_props list
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* Are assigned an ID within the context that is not transferrable through different search results
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* within the same atlas.
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* @param atlas Atlas instance
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* @param extra_props properties
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* @param ptr given pointer from previously compiled atlas
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* @param pos atlas image size
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* @return status of atlas data opening
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*/
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da_status_t da_atlas_open(da_atlas_t *atlas, da_property_decl_t *extra_props, const void *ptr, size_t pos);
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/**
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* @brief Release any resources associated with the atlas structure atlas, which was previously generated from
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* da_read_atlas or da_compile_atlas.
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* @param atlas instance
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*/
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void da_atlas_close(da_atlas_t *atlas);
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/**
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* @brief Find device properties given a set of evidence.
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* Search results are returned in da_deviceinfo_t, and must be cleaned using da_close
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* "Evidence" is an array of length count, of string data tagged with an evidence ID.
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* @param atlas Atlas instance
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* @param info Device info
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* @param ev Array of evidences
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* @param count Number of evidence given
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* @return status of the search
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*/
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da_status_t da_searchv(const da_atlas_t *atlas, da_deviceinfo_t *info, da_evidence_t *ev, size_t count);
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/**
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* @brief As da_search, but unrolls the evidence array into variable arguments for simpler calling
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* convention with known evidence types.
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* varargs are pairs of (da_evidence_id, string), terminated with da_evidence_id DA_END
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* @code da_search(&myAtlas, &deviceInfo, da_get_header_evidence_id("User-Agent"),
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* "Mozilla/5.0 (Linux...", DA_END);
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* @endcode
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* @param atlas Atlas instance
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* @param info given device info which holds on device properties
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* @param pairs of evidence id / evidence value
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* @return status of the search
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*/
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da_status_t da_search(const da_atlas_t *atlas, da_deviceinfo_t *info, ...);
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/**
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* @brief After finishing with a search result, release resources associated with it.
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* @param info Device info previously allocated by search functions
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*/
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void da_close(da_deviceinfo_t *info);
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/**
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* @brief Given a property name (Eg, "displayWidth"), return the property ID associated with it for the
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* specified atlas.
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* @param atlas Atlas instance
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* @param propname Property name
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* @param propid Property id
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* @return status of the property id search
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*/
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da_status_t da_atlas_getpropid(const da_atlas_t *atlas, const char *propname, da_propid_t *propid);
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/**
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* @brief Given a property ID, return the type of that property.
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* @code
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* da_getproptype(&myAtlas, da_getpropid(&myAtlas, "displayWidth"), &propertyType);
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* assert(propertyType == DA_TYPE_INT);
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* @endcode
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* @param atlas Atlas instance
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* @param propid Property id
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* @param type Type id of the property
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* @return status of the type id search
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*/
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da_status_t da_atlas_getproptype(const da_atlas_t *atlas, da_propid_t propid, da_type_t *type);
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/**
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* @brief Given a property ID, return the name of that property.
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* @code
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* da_atlas_getpropname(&myAtlas, da_getpropid(&myAtlas, "displayWidth"), &propertyName);
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* assert(strcmp("displayWidth", propertyName) == 0);
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* @endcode
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* @param atlas Atlas instance
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* @param propid property id
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* @param propname property name returned
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* @return status of the property name search
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*/
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da_status_t da_atlas_getpropname(const da_atlas_t *atlas, da_propid_t propid, const char **propname);
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/**
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* @brief Given an atlas instance, return its counters + the builtins
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* @code
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* da_atlas_getpropcount(&myAtlas);
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* @endcode
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* @param atlas Atlas instance
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* @return counters
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*/
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size_t da_atlas_getpropcount(const da_atlas_t *atlas);
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/**
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* @brief Given an atlas instance, set the detection config
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* @param atlas Atlas instance
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* @param config instance
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*/
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void da_atlas_setconfig(da_atlas_t *atlas, da_config_t *config);
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/**
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* @brief Given a search result, find the value of a specific property.
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* @code
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* long displayWidth; // width of display in pixels.
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* da_getpropinteger(&deviceInfo, da_getpropid(&myAtlas, "displayWidth"), &displayWidth);
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* @endcode
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* String contents are owned by the search result, and are valid until the search is closed.
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*/
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/**
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* @brief returns a property value as a string from a given string typed property id
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* @param info Device info
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* @param propid Property id
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* @param value Value of the property
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* @return status of property value search
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*/
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da_status_t da_getpropstring(const da_deviceinfo_t *info, da_propid_t propid, const char **value);
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/**
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* @brief returns a property value as a long from a given long typed property id
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* @param info Device info
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* @param propid Property id
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* @param value Value of the property
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* @return status of property value search
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*/
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da_status_t da_getpropinteger(const da_deviceinfo_t *info, da_propid_t propid, long *value);
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/**
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* @brief returns a property value as a boolean from a given boolean typed property id
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* @param info Device info
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* @param propid Property id
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* @param value Value of the property
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* @return status of property value search
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*/
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da_status_t da_getpropboolean(const da_deviceinfo_t *info, da_propid_t propid, bool *value);
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/**
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* @brief returns a property value as a float from a given float typed property id
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* @param info Device info
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* @param propid Property id
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* @param value Value of the property
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* @return status of property value search
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*/
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da_status_t da_getpropfloat(const da_deviceinfo_t *info, da_propid_t propid, double *value);
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/**
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* @brief Some properties may not be not known to the atlas before the search commences.
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* Such properties cannot have a da_propid_t assigned to them on the atlas, but will
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* have a local property assigned during search. The name and type of such properties
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* can be discovered here.
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*
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* Properties that are used in the atlas source and properties specifically registered
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* with da_atlas_open() will always be assigned to a property discovered during search.
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* Therefore, if there are specific properties that you want to use, and are unsure
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* if they are in your device atlas source, registering them with da_atlas_open will
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* make access to them easier and more efficient
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*/
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/**
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* @brief returns the type of a given device property from the search functions
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* @param info Device info
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* @param propid Property id
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* @param type Type id
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* @return status of property type search
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*/
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da_status_t da_getproptype(const da_deviceinfo_t *info, da_propid_t propid, da_type_t *type);
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/**
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* @brief returns the name of a given device property from the search functions
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* @param info Device info
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* @param propid Property id
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* @param propname Property name
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* @return status of property type search
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*/
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da_status_t da_getpropname(const da_deviceinfo_t *info, da_propid_t propid, const char **propname);
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/**
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* @brief da_getfirstprop/da_getnextprop provide iteration over all properties
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* in a search result.
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* Both will return DA_OK if there is a result available, and DA_NOMORE
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* if the search is complete.
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* @code
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*
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* da_propid_t *propidp;
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* for (da_status_t status = da_getfirstprop(&result, &propidp);
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* status == DA_OK;
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* status = da_getnextprop(&result, &propidp)) {
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* const char *propname;
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* if (da_getpropname(&result, *propidp, &propname) == DA_OK)
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* fprintf("found property %s\n", propname);
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* }
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* @endcode
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*/
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/**
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* @brief returns the first property from device info
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* @param info Device info
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* @param propid Property
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* @return status
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*/
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da_status_t da_getfirstprop(const da_deviceinfo_t *info, da_propid_t **propid);
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/**
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* @brief device info properties iterator
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* @param info Device info
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* @param propid Property
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* @return status
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*/
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da_status_t da_getnextprop(const da_deviceinfo_t *info, da_propid_t **propid);
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/**
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* @brief Report an error, as per a report from the API to the user-callback.
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* @param severity Severity level of the error
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* @param fmt format error message
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* @param va_list
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* @return status
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*/
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da_status_t da_reporterror(da_status_t severity, const char *fmt, ...);
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/**
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* @brief returns a textual description of the type "type".
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* @param type Type id
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* @return type name
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*/
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const char *da_typename(da_type_t type);
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/**
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* @brief returns the version from the JSON in memory
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* @param atlas
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* @return version
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*/
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char *da_getdataversion(da_atlas_t *atlas);
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/**
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* @brief returns the date creation's timestamp from the JSON in memory
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* @param atlas
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* @return version
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*/
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time_t da_getdatacreation(da_atlas_t *atlas);
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/**
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* @brief returns the revision's number from the JSON in memory
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* @param atlas
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* @return version
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*/
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int da_getdatarevision(da_atlas_t *atlas);
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/**
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* @brief returns the name of a global property
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* @param atlas Atlas instance
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* @param propid Property id
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* @return property name
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*/
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const char *da_get_property_name(const da_atlas_t *atlas, da_propid_t propid);
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/**
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* @brief returns the number of properties in a result.
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* @param info Device info
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* @return properties count
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*/
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size_t da_getpropcount(const da_deviceinfo_t *info);
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/*
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* Details below should not be required for usage of the API
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*/
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/**
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* @brief Represents a usable device atlas interface.
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*
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* No user servicable parts inside: access should
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* be via the functional API.
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*/
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struct da_atlas {
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const struct atlas_image *image;
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struct header_evidence_entry *header_priorities;
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size_t header_evidence_count;
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struct pcre_regex_info *uar_regexes;
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size_t uar_regex_count;
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struct pcre_regex_info *replacement_regexes;
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size_t replacement_regex_count;
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da_evidence_id_t user_agent_evidence;
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da_evidence_id_t clientprops_evidence;
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da_evidence_id_t accept_language_evidence;
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da_evidence_id_t next_evidence;
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da_propset_t *properties;
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da_propid_t id_propid;
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da_propid_t id_proplang;
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da_propid_t id_proplang_locale;
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da_config_t config;
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da_deviceinfo_t **cpr_props;
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size_t cpr_count;
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};
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/* fixed constants. */
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enum {
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DA_BUFSIZE = 16000
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};
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/**
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* Represents a chunk of memory. See comments on da_deviceinfo.
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* This is presented here to allow aggregation in da_deviceinfo:
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* Not for public consumption.
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*/
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struct da_buf {
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struct da_buf *next;
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char *cur;
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char *limit;
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char buf[DA_BUFSIZE];
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};
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/**
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* A callback interface for allocating memory from some source
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* Not for public consumption.
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*/
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struct da_allocator {
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da_alloc_fn alloc;
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da_free_fn free;
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da_realloc_fn realloc;
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void *context;
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};
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/**
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* Represents a search result
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* Can be used to retrieve values of known properties discovered from the evidence,
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* iterate over the properties with known values, and query property types that are
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* local to this result.
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*
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* The atlas the search is carried out on must survive any da_deviceinfo results
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* it provides.
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*/
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struct da_deviceinfo {
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struct da_allocator allocator;
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const da_atlas_t *atlas; /* reference to the atlas the search was carried out on. */
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struct da_bitset *present; /* property received from tree */
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struct da_bitset *localprop; /* property was received from UAR rule or CPR */
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struct da_bitset *cprprop; /* property was received from CPR */
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union da_value *properties; /* properties - indexed by property id. */
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da_propid_t *proplist; /* list of properties present in this result. */
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size_t propcount; /* size of proplist */
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da_propset_t *local_types; /* property descriptors local to this search result. */
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/**
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* The per-deviceinfo heap is stored here. Allocations for data in the result
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* come from the raw data in these buffers. The size of the fixed-size buffer
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* built in to da_buf is sized such that all known search results will not
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* require memory allocation via malloc()
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*/
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struct da_buf *heap;
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struct da_buf initial_heap;
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};
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/**
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* Used to pass evidence to da_searchv()
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*/
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struct da_evidence {
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da_evidence_id_t key;
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char *value;
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};
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/**
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* Used to pass properties the API intends to query to the da_atlas_open function
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* This can be used to improve performance of lookup on properties well-known
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* to the API user, but not present in the JSON database.
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*/
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struct da_property_decl {
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const char *name;
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da_type_t type;
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};
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#endif /* DEVATLAS_DAC_H */
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