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108 lines
3.0 KiB
108 lines
3.0 KiB
/**
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* Utility functions for users and internal use of the HTTP server
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*/
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#pragma once
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#include <stdint.h>
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#include <string.h>
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#include "httpd-types.h"
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// Custom helpers
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#define streq(a, b) (strcmp((const char*)(a), (const char*)(b)) == 0)
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#define strneq(a, b, n) (strncmp((const char*)(a), (const char*)(b), (n)) == 0)
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#define strstarts(a, b) strneq((a), (b), strlen((b)))
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#define last_char_n(str, n) ((str))[strlen((str)) - (n)]
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#define last_char(str) last_char_n((str), 1)
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#ifndef container_of
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#define container_of(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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#endif
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/**
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* Turn a nibble (0-15) to a hex char.
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*
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* Only the bottom 4 bits are considered.
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*
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* @param val
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* @return hex char, uppercase
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*/
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char httpdHexNibble(uint8_t val);
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/**
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* Turn a hex char into integer
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*
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* @param c - char to convert, [0-9a-fA-F]
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* @return integer value 0-15
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*/
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uint8_t httpdHexVal(char c);
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/**
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* Decode a percent-encoded value.
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* Takes the valLen bytes stored in val, and converts it into at most retLen bytes that
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* are stored in the ret buffer. Returns the actual amount of bytes used in ret. Also
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* zero-terminates the ret buffer.
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*
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* @param val - the encoded value
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* @param valLen - length of the encoded value field
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* @param buff - output buffer, the string will be zero-terminated
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* @param buffLen - output buffer size
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* @return Decoded len
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*/
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size_t httpdUrlDecode(const char *val, size_t valLen, char *buff, size_t buffLen);
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/**
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* Find a specific arg in a string of get- or post-data.
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* Line is the string of post/get-data, arg is the name of the value to find. The
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* zero-terminated result is written in buff, with at most buffLen bytes used. The
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* function returns the length of the result, or -1 if the value wasn't found. The
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* returned string will be urldecoded already.
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*
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* @param line - line to parse
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* @param arg - name of the argument to retrieve
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* @param[out] buff - output buffer, the string will be zero-terminated
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* @param buffLen - output buffer size
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* @return length of the result, or -1
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*/
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int httpdFindArg(const char *line, const char *arg, char *buff, size_t buffLen);
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/**
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* Returns a static char* to a mime type for a given url to a file.
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*
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* @param url - URL or filename to parse
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* @return mime type string; NULL if unknown.
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*/
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const char *httpdGetMimetype(const char *url);
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/**
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* Get mimetype or default
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*
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* @param url - URL or filename to parse
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* @param fallback - fallback mime if none was resolved
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* @return mime string
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*/
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static inline const char *httpdGetMimetypeOr(const char *url, const char *fallback) {
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const char *mime = httpdGetMimetype(url);
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if (!mime) {
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mime = fallback;
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}
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return mime;
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}
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/**
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* Turn HTTP method to text
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*
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* @param m - method enum
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* @return text, e.g. GET
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*/
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const char *httpdMethodName(httpd_method m);
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/**
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* Get text version of a HTTP status code
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*
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* @param code - code
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* @return text, e.g OK or Forbidden
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*/
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const char *httpdStatusName(int code);
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