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serval-dna/str.c
Andrew Bettison 27052384ed Add Base64URL encode/decode functions
2013-11-18 16:22:55 +10:30

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/*
Serval string primitives
Copyright (C) 2012 Serval Project Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define __SERVAL_DNA_STR_INLINE
#include "str.h"
#include "strbuf_helpers.h"
#include "constants.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/uio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <limits.h>
#include <errno.h>
const char hexdigit_upper[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
const char hexdigit_lower[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
char *tohex(char *dstHex, size_t dstStrLen, const unsigned char *srcBinary)
{
char *p;
size_t i;
for (p = dstHex, i = 0; i < dstStrLen; ++i)
*p++ = (i & 1) ? hexdigit_upper[*srcBinary++ & 0xf] : hexdigit_upper[*srcBinary >> 4];
*p = '\0';
return dstHex;
}
size_t fromhex(unsigned char *dstBinary, const char *srcHex, size_t nbinary)
{
if (strn_fromhex(dstBinary, nbinary, srcHex, NULL) == nbinary)
return nbinary;
return -1;
}
int fromhexstr(unsigned char *dstBinary, const char *srcHex, size_t nbinary)
{
const char *p;
if (strn_fromhex(dstBinary, nbinary, srcHex, &p) == nbinary && *p == '\0')
return 0;
return -1;
}
size_t strn_fromhex(unsigned char *dstBinary, ssize_t dstlen, const char *srcHex, const char **afterHex)
{
unsigned char *dstorig = dstBinary;
unsigned char *dstend = dstBinary + dstlen;
while (dstlen == -1 || dstBinary < dstend) {
int high = hexvalue(srcHex[0]);
if (high == -1)
break;
int low = hexvalue(srcHex[1]);
if (low == -1)
break;
if (dstorig != NULL)
*dstBinary = (high << 4) + low;
++dstBinary;
srcHex += 2;
}
if (afterHex)
*afterHex = srcHex;
return dstBinary - dstorig;
}
const char base64_symbols[65] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/',
'='
};
const char base64url_symbols[65] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','-','_',
'='
};
static size_t _base64_encodev(const char symbols[], char *dstBase64, const struct iovec *const iov, int const iovcnt)
{
char *dst = dstBase64;
unsigned place = 0;
unsigned char buf = 0;
int iovc = 0;
for (iovc = 0; iovc != iovcnt; ++iovc) {
unsigned char *src = iov[iovc].iov_base;
size_t cnt = iov[iovc].iov_len;
for (; cnt; --cnt, ++src) {
switch (place) {
case 0:
*dst++ = symbols[*src >> 2];
buf = (*src << 4) & 0x3f;
place = 1;
break;
case 1:
*dst++ = symbols[(*src >> 4) | buf];
buf = (*src << 2) & 0x3f;
place = 2;
break;
case 2:
*dst++ = symbols[(*src >> 6) | buf];
*dst++ = symbols[*src & 0x3f];
place = 0;
break;
}
}
}
if (place)
*dst++ = symbols[buf];
switch (place) {
case 2:
*dst++ = symbols[64];
case 1:
*dst++ = symbols[64];
}
return dst - dstBase64;
}
size_t base64_encodev(char *dstBase64, const struct iovec *const iov, int const iovcnt)
{
return _base64_encodev(base64_symbols, dstBase64, iov, iovcnt);
}
size_t base64url_encodev(char *dstBase64, const struct iovec *const iov, int const iovcnt)
{
return _base64_encodev(base64url_symbols, dstBase64, iov, iovcnt);
}
size_t base64_encode(char *const dstBase64, const unsigned char *src, size_t srclen)
{
struct iovec iov;
iov.iov_base = (void *) src;
iov.iov_len = srclen;
return _base64_encodev(base64_symbols, dstBase64, &iov, 1);
}
size_t base64url_encode(char *const dstBase64, const unsigned char *src, size_t srclen)
{
struct iovec iov;
iov.iov_base = (void *) src;
iov.iov_len = srclen;
return _base64_encodev(base64url_symbols, dstBase64, &iov, 1);
}
char *to_base64_str(char *const dstBase64, const unsigned char *srcBinary, size_t srcBytes)
{
dstBase64[base64_encode(dstBase64, srcBinary, srcBytes)] = '\0';
return dstBase64;
}
char *to_base64url_str(char *const dstBase64, const unsigned char *srcBinary, size_t srcBytes)
{
dstBase64[base64url_encode(dstBase64, srcBinary, srcBytes)] = '\0';
return dstBase64;
}
static size_t _base64_decode(unsigned char *dstBinary, size_t dstsiz, const char *const srcBase64, size_t srclen,
const char **afterp, int flags, int (*skip_pred)(char),
int (*isdigit_pred)(char), int (*ispad_pred)(char), uint8_t (*todigit)(char)
)
{
uint8_t buf = 0;
size_t digits = 0;
unsigned pads = 0;
size_t bytes = 0;
const char *const srcend = srcBase64 + srclen;
const char *src = srcBase64;
const char *first_pad = NULL;
for (; srclen == 0 || (src < srcend); ++src) {
int isdigit = isdigit_pred(*src);
int ispad = ispad_pred(*src);
if (!isdigit && !ispad && skip_pred && skip_pred(*src))
continue;
assert(pads <= 2);
if (pads == 2)
break;
int place = digits & 3;
if (pads == 1) {
if (place == 3)
break;
assert(place == 2);
if (ispad) {
++pads;
continue; // consume trailing space before ending
}
// If only one pad character was present but there should be two, then don't consume the first
// one.
assert(first_pad != NULL);
src = first_pad;
break;
}
assert(pads == 0);
if (ispad && place >= 2) {
first_pad = src;
++pads;
continue;
}
if (!isdigit)
break;
++digits;
if (dstBinary && bytes < dstsiz) {
uint8_t d = todigit(*src);
switch (place) {
case 0:
buf = d << 2;
break;
case 1:
dstBinary[bytes++] = buf | (d >> 4);
buf = d << 4;
break;
case 2:
dstBinary[bytes++] = buf | (d >> 2);
buf = d << 6;
break;
case 3:
dstBinary[bytes++] = buf | d;
break;
}
} else if (flags & B64_CONSUME_ALL) {
switch (place) {
case 1: case 2: case 3: ++bytes;
}
} else
break;
}
if (afterp)
*afterp = src;
else if (*src)
return 0;
return bytes;
}
size_t base64_decode(unsigned char *dstBinary, size_t dstsiz, const char *const srcBase64, size_t srclen,
const char **afterp, int flags, int (*skip_pred)(char))
{
return _base64_decode(dstBinary, dstsiz, srcBase64, srclen, afterp, flags, skip_pred, is_base64_digit, is_base64_pad, base64_digit);
}
size_t base64url_decode(unsigned char *dstBinary, size_t dstsiz, const char *const srcBase64, size_t srclen,
const char **afterp, int flags, int (*skip_pred)(char))
{
return _base64_decode(dstBinary, dstsiz, srcBase64, srclen, afterp, flags, skip_pred, is_base64url_digit, is_base64url_pad, base64url_digit);
}
#define _B64 _SERVAL_CTYPE_0_BASE64
#define _B64U _SERVAL_CTYPE_0_BASE64URL
uint8_t _serval_ctype_0[UINT8_MAX] = {
['A'] = _B64 | _B64U | 0,
['B'] = _B64 | _B64U | 1,
['C'] = _B64 | _B64U | 2,
['D'] = _B64 | _B64U | 3,
['E'] = _B64 | _B64U | 4,
['F'] = _B64 | _B64U | 5,
['G'] = _B64 | _B64U | 6,
['H'] = _B64 | _B64U | 7,
['I'] = _B64 | _B64U | 8,
['J'] = _B64 | _B64U | 9,
['K'] = _B64 | _B64U | 10,
['L'] = _B64 | _B64U | 11,
['M'] = _B64 | _B64U | 12,
['N'] = _B64 | _B64U | 13,
['O'] = _B64 | _B64U | 14,
['P'] = _B64 | _B64U | 15,
['Q'] = _B64 | _B64U | 16,
['R'] = _B64 | _B64U | 17,
['S'] = _B64 | _B64U | 18,
['T'] = _B64 | _B64U | 19,
['U'] = _B64 | _B64U | 20,
['V'] = _B64 | _B64U | 21,
['W'] = _B64 | _B64U | 22,
['X'] = _B64 | _B64U | 23,
['Y'] = _B64 | _B64U | 24,
['Z'] = _B64 | _B64U | 25,
['a'] = _B64 | _B64U | 26,
['b'] = _B64 | _B64U | 27,
['c'] = _B64 | _B64U | 28,
['d'] = _B64 | _B64U | 29,
['e'] = _B64 | _B64U | 30,
['f'] = _B64 | _B64U | 31,
['g'] = _B64 | _B64U | 32,
['h'] = _B64 | _B64U | 33,
['i'] = _B64 | _B64U | 34,
['j'] = _B64 | _B64U | 35,
['k'] = _B64 | _B64U | 36,
['l'] = _B64 | _B64U | 37,
['m'] = _B64 | _B64U | 38,
['n'] = _B64 | _B64U | 39,
['o'] = _B64 | _B64U | 40,
['p'] = _B64 | _B64U | 41,
['q'] = _B64 | _B64U | 42,
['r'] = _B64 | _B64U | 43,
['s'] = _B64 | _B64U | 44,
['t'] = _B64 | _B64U | 45,
['u'] = _B64 | _B64U | 46,
['v'] = _B64 | _B64U | 47,
['w'] = _B64 | _B64U | 48,
['x'] = _B64 | _B64U | 49,
['y'] = _B64 | _B64U | 50,
['z'] = _B64 | _B64U | 51,
['0'] = _B64 | _B64U | 52,
['1'] = _B64 | _B64U | 53,
['2'] = _B64 | _B64U | 54,
['3'] = _B64 | _B64U | 55,
['4'] = _B64 | _B64U | 56,
['5'] = _B64 | _B64U | 57,
['6'] = _B64 | _B64U | 58,
['7'] = _B64 | _B64U | 59,
['8'] = _B64 | _B64U | 60,
['9'] = _B64 | _B64U | 61,
['+'] = _B64 | 62,
['/'] = _B64 | 63,
['-'] = _B64U | 62,
['_'] = _B64U | 63,
};
#define _SEP _SERVAL_CTYPE_1_HTTP_SEPARATOR
#define _URI_SCHEME _SERVAL_CTYPE_1_URI_SCHEME
#define _URI_UNRES _SERVAL_CTYPE_1_URI_UNRESERVED
#define _URI_RES _SERVAL_CTYPE_1_URI_RESERVED
uint8_t _serval_ctype_1[UINT8_MAX] = {
['A'] = _URI_SCHEME | _URI_UNRES | 0xA,
['B'] = _URI_SCHEME | _URI_UNRES | 0xB,
['C'] = _URI_SCHEME | _URI_UNRES | 0xC,
['D'] = _URI_SCHEME | _URI_UNRES | 0xD,
['E'] = _URI_SCHEME | _URI_UNRES | 0xE,
['F'] = _URI_SCHEME | _URI_UNRES | 0xF,
['G'] = _URI_SCHEME | _URI_UNRES,
['H'] = _URI_SCHEME | _URI_UNRES,
['I'] = _URI_SCHEME | _URI_UNRES,
['J'] = _URI_SCHEME | _URI_UNRES,
['K'] = _URI_SCHEME | _URI_UNRES,
['L'] = _URI_SCHEME | _URI_UNRES,
['M'] = _URI_SCHEME | _URI_UNRES,
['N'] = _URI_SCHEME | _URI_UNRES,
['O'] = _URI_SCHEME | _URI_UNRES,
['P'] = _URI_SCHEME | _URI_UNRES,
['Q'] = _URI_SCHEME | _URI_UNRES,
['R'] = _URI_SCHEME | _URI_UNRES,
['S'] = _URI_SCHEME | _URI_UNRES,
['T'] = _URI_SCHEME | _URI_UNRES,
['U'] = _URI_SCHEME | _URI_UNRES,
['V'] = _URI_SCHEME | _URI_UNRES,
['W'] = _URI_SCHEME | _URI_UNRES,
['X'] = _URI_SCHEME | _URI_UNRES,
['Y'] = _URI_SCHEME | _URI_UNRES,
['Z'] = _URI_SCHEME | _URI_UNRES,
['a'] = _URI_SCHEME | _URI_UNRES | 0xa,
['b'] = _URI_SCHEME | _URI_UNRES | 0xb,
['c'] = _URI_SCHEME | _URI_UNRES | 0xc,
['d'] = _URI_SCHEME | _URI_UNRES | 0xd,
['e'] = _URI_SCHEME | _URI_UNRES | 0xe,
['f'] = _URI_SCHEME | _URI_UNRES | 0xf,
['g'] = _URI_SCHEME | _URI_UNRES,
['h'] = _URI_SCHEME | _URI_UNRES,
['i'] = _URI_SCHEME | _URI_UNRES,
['j'] = _URI_SCHEME | _URI_UNRES,
['k'] = _URI_SCHEME | _URI_UNRES,
['l'] = _URI_SCHEME | _URI_UNRES,
['m'] = _URI_SCHEME | _URI_UNRES,
['n'] = _URI_SCHEME | _URI_UNRES,
['o'] = _URI_SCHEME | _URI_UNRES,
['p'] = _URI_SCHEME | _URI_UNRES,
['q'] = _URI_SCHEME | _URI_UNRES,
['r'] = _URI_SCHEME | _URI_UNRES,
['s'] = _URI_SCHEME | _URI_UNRES,
['t'] = _URI_SCHEME | _URI_UNRES,
['u'] = _URI_SCHEME | _URI_UNRES,
['v'] = _URI_SCHEME | _URI_UNRES,
['w'] = _URI_SCHEME | _URI_UNRES,
['x'] = _URI_SCHEME | _URI_UNRES,
['y'] = _URI_SCHEME | _URI_UNRES,
['z'] = _URI_SCHEME | _URI_UNRES,
['0'] = _URI_SCHEME | _URI_UNRES | 0,
['1'] = _URI_SCHEME | _URI_UNRES | 1,
['2'] = _URI_SCHEME | _URI_UNRES | 2,
['3'] = _URI_SCHEME | _URI_UNRES | 3,
['4'] = _URI_SCHEME | _URI_UNRES | 4,
['5'] = _URI_SCHEME | _URI_UNRES | 5,
['6'] = _URI_SCHEME | _URI_UNRES | 6,
['7'] = _URI_SCHEME | _URI_UNRES | 7,
['8'] = _URI_SCHEME | _URI_UNRES | 8,
['9'] = _URI_SCHEME | _URI_UNRES | 9,
['\t'] = _SEP,
[' '] = _SEP,
['_'] = _URI_UNRES,
['='] = _SEP | _URI_RES,
['<'] = _SEP,
['>'] = _SEP,
[';'] = _SEP | _URI_RES,
[':'] = _SEP | _URI_RES,
['\\'] = _SEP,
['\''] = _URI_RES,
['"'] = _SEP,
['/'] = _SEP | _URI_RES,
['['] = _SEP | _URI_RES,
[']'] = _SEP | _URI_RES,
['{'] = _SEP,
['}'] = _SEP,
['('] = _SEP | _URI_RES,
[')'] = _SEP | _URI_RES,
[','] = _SEP | _URI_RES,
['.'] = _URI_SCHEME | _URI_UNRES,
['?'] = _SEP | _URI_RES,
['!'] = _URI_RES,
['+'] = _URI_SCHEME | _URI_RES,
['-'] = _URI_SCHEME | _URI_UNRES,
['*'] = _URI_RES,
['$'] = _URI_RES,
['&'] = _URI_RES,
['#'] = _URI_RES,
['@'] = _SEP | _URI_RES,
['~'] = _URI_UNRES,
};
#define _BND _SERVAL_CTYPE_2_MULTIPART_BOUNDARY
uint8_t _serval_ctype_2[UINT8_MAX] = {
['A'] = _BND,
['B'] = _BND,
['C'] = _BND,
['D'] = _BND,
['E'] = _BND,
['F'] = _BND,
['G'] = _BND,
['H'] = _BND,
['I'] = _BND,
['J'] = _BND,
['K'] = _BND,
['L'] = _BND,
['M'] = _BND,
['N'] = _BND,
['O'] = _BND,
['P'] = _BND,
['Q'] = _BND,
['R'] = _BND,
['S'] = _BND,
['T'] = _BND,
['U'] = _BND,
['V'] = _BND,
['W'] = _BND,
['X'] = _BND,
['Y'] = _BND,
['Z'] = _BND,
['a'] = _BND,
['b'] = _BND,
['c'] = _BND,
['d'] = _BND,
['e'] = _BND,
['f'] = _BND,
['g'] = _BND,
['h'] = _BND,
['i'] = _BND,
['j'] = _BND,
['k'] = _BND,
['l'] = _BND,
['m'] = _BND,
['n'] = _BND,
['o'] = _BND,
['p'] = _BND,
['q'] = _BND,
['r'] = _BND,
['s'] = _BND,
['t'] = _BND,
['u'] = _BND,
['v'] = _BND,
['w'] = _BND,
['x'] = _BND,
['y'] = _BND,
['z'] = _BND,
['0'] = _BND,
['1'] = _BND,
['2'] = _BND,
['3'] = _BND,
['4'] = _BND,
['5'] = _BND,
['6'] = _BND,
['7'] = _BND,
['8'] = _BND,
['9'] = _BND,
['+'] = _BND,
['/'] = _BND,
['='] = _BND,
['-'] = _BND,
['.'] = _BND,
[':'] = _BND,
['_'] = _BND,
['('] = _BND,
[')'] = _BND,
[','] = _BND,
['?'] = _BND,
[' '] = _BND,
};
/* Does this whole buffer contain the same value? */
int is_all_matching(const unsigned char *ptr, size_t len, unsigned char value)
{
while (len--)
if (*ptr++ != value)
return 0;
return 1;
}
char *str_toupper_inplace(char *str)
{
register char *s;
for (s = str; *s; ++s)
*s = toupper(*s);
return str;
}
char *str_tolower_inplace(char *str)
{
register char *s;
for (s = str; *s; ++s)
*s = tolower(*s);
return str;
}
const char *strnchr(const char *s, size_t n, char c)
{
for (; n; --n, ++s) {
if (*s == c)
return s;
if (!*s)
break;
}
return NULL;
}
int str_startswith(const char *str, const char *substring, const char **afterp)
{
while (*substring && *substring == *str)
++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strn_startswith(const char *str, size_t len, const char *substring, const char **afterp)
{
while (len && *substring && *substring == *str)
--len, ++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strcase_startswith(const char *str, const char *substring, const char **afterp)
{
while (*substring && *str && toupper(*substring) == toupper(*str))
++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strncase_startswith(const char *str, size_t len, const char *substring, const char **afterp)
{
while (len && *substring && toupper(*substring) == toupper(*str))
--len, ++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strn_str_cmp(const char *str1, size_t len1, const char *str2)
{
int r = strncmp(str1, str2, len1);
if (r)
return r;
size_t len2 = strlen(str2);
return len1 < len2 ? -1 : len1 > len2 ? 1 : 0;
}
int strn_str_casecmp(const char *str1, size_t len1, const char *str2)
{
int r = strncasecmp(str1, str2, len1);
if (r)
return r;
size_t len2 = strlen(str2);
return len1 < len2 ? -1 : len1 > len2 ? 1 : 0;
}
int parse_argv(char *cmdline, char delim, char **argv, int max_argv)
{
int argc=0;
if (*cmdline && argc<max_argv){
argv[argc++]=cmdline;
}
// TODO quoted argument handling?
while(*cmdline){
if (*cmdline==delim){
*cmdline=0;
if (cmdline[1] && argc<max_argv)
argv[argc++]=cmdline+1;
}
cmdline++;
}
return argc;
}
/* Like strstr() but doesn't depend on null termination */
char *str_str(char *haystack, const char *needle, int haystack_len)
{
size_t needle_len = strlen(needle);
if (needle_len == 0)
return haystack;
if (haystack_len >= needle_len) {
for (; *haystack && haystack_len >= needle_len; ++haystack, --haystack_len)
if (strncmp(haystack, needle, needle_len) == 0)
return haystack;
}
return NULL;
}
int str_to_int(const char *str, int base, int *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
long value = strtol(str, (char**)&end, base);
if (afterp)
*afterp = end;
if (errno == ERANGE || end == str || value > INT_MAX || value < INT_MIN || isdigit(*end) || (!afterp && *end))
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint(const char *str, int base, unsigned *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
unsigned long value = strtoul(str, (char**)&end, base);
if (afterp)
*afterp = end;
if (errno == ERANGE || end == str || value > UINT_MAX || isdigit(*end) || (!afterp && *end))
return 0;
if (result)
*result = value;
return 1;
}
int str_to_int64(const char *str, int base, int64_t *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
long long value = strtoll(str, (char**)&end, base);
if (afterp)
*afterp = end;
if (errno == ERANGE || end == str || isdigit(*end) || (!afterp && *end))
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint64(const char *str, int base, uint64_t *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
unsigned long long value = strtoull(str, (char**)&end, base);
if (afterp)
*afterp = end;
if (errno == ERANGE || end == str || isdigit(*end) || (!afterp && *end))
return 0;
if (result)
*result = value;
return 1;
}
static struct scale_factor {
char symbol;
uint64_t factor;
}
scale_factors[] = {
{ 'G', 1024LL * 1024LL * 1024LL },
{ 'g', 1000LL * 1000LL * 1000LL },
{ 'M', 1024LL * 1024LL },
{ 'm', 1000LL * 1000LL },
{ 'K', 1024LL },
{ 'k', 1000LL }
};
uint64_t scale_factor(const char *str, const char **afterp)
{
uint64_t factor = 1;
int i;
for (i = 0; i != NELS(scale_factors); ++i)
if (scale_factors[i].symbol == str[0]) {
++str;
factor = scale_factors[i].factor;
break;
}
if (afterp)
*afterp = str;
else if (*str)
factor = 0;
return factor;
}
int str_to_int64_scaled(const char *str, int base, int64_t *result, const char **afterp)
{
int64_t value;
const char *end = str;
if (!str_to_int64(str, base, &value, &end)) {
if (afterp)
*afterp = end;
return 0;
}
value *= scale_factor(end, &end);
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint64_scaled(const char *str, int base, uint64_t *result, const char **afterp)
{
uint64_t value;
const char *end = str;
if (!str_to_uint64(str, base, &value, &end)) {
if (afterp)
*afterp = end;
return 0;
}
value *= scale_factor(end, &end);
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int uint64_scaled_to_str(char *str, size_t len, uint64_t value)
{
char symbol = '\0';
int i;
for (i = 0; i != NELS(scale_factors); ++i)
if (value % scale_factors[i].factor == 0) {
value /= scale_factors[i].factor;
symbol = scale_factors[i].symbol;
break;
}
strbuf b = strbuf_local(str, len);
strbuf_sprintf(b, "%llu", (unsigned long long) value);
if (symbol)
strbuf_putc(b, symbol);
return strbuf_overrun(b) ? 0 : 1;
}
int str_to_uint64_interval_ms(const char *str, int64_t *result, const char **afterp)
{
const unsigned precision = 1000;
if (isspace(*str))
return 0;
const char *end = str;
unsigned long long value = strtoull(str, (char**)&end, 10) * precision;
if (end == str) {
if (afterp)
*afterp = end;
return 0;
}
if (end[0] == '.' && isdigit(end[1])) {
++end;
unsigned factor;
for (factor = precision / 10; isdigit(*end) && factor; factor /= 10)
value += (*end++ - '0') * factor;
}
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
/* Format a buffer of data as a printable representation, eg: "Abc\x0b\n\0", for display
in log messages.
@author Andrew Bettison <andrew@servalproject.com>
*/
char *toprint(char *dstStr, ssize_t dstBufSiz, const char *srcBuf, size_t srcBytes, const char quotes[2])
{
strbuf b = strbuf_local(dstStr, dstBufSiz);
strbuf_toprint_quoted_len(b, quotes, srcBuf, srcBytes);
return dstStr;
}
/* Compute the length of the string produced by toprint(). If dstStrLen == -1 then returns the
exact number of characters in the printable representation (excluding the terminating nul),
otherwise returns dstStrLen.
@author Andrew Bettison <andrew@servalproject.com>
*/
size_t toprint_len(const char *srcBuf, size_t srcBytes, const char quotes[2])
{
return strbuf_count(strbuf_toprint_quoted_len(strbuf_local(NULL, 0), quotes, srcBuf, srcBytes));
}
/* Format a null-terminated string as a printable representation, eg: `Abc\x0b\n`, for display
in log messages. If the given string pointer is NULL, return the string "NULL" without quotes.
@author Andrew Bettison <andrew@servalproject.com>
*/
char *toprint_str(char *dstStr, ssize_t dstBufSiz, const char *srcStr, const char quotes[2])
{
strbuf b = strbuf_local(dstStr, dstBufSiz);
if (srcStr)
strbuf_toprint_quoted(b, quotes, srcStr);
else
strbuf_puts(b, "NULL");
return dstStr;
}
/* Compute the length of the string produced by toprint_str(), excluding the terminating nul.
@author Andrew Bettison <andrew@servalproject.com>
*/
size_t toprint_str_len(const char *srcStr, const char quotes[2])
{
return srcStr ? strbuf_count(strbuf_toprint_quoted(strbuf_local(NULL, 0), quotes, srcStr)) : 4;
}
size_t strn_fromprint(unsigned char *dst, size_t dstsiz, const char *src, size_t srclen, char endquote, const char **afterp)
{
unsigned char *const odst = dst;
unsigned char *const edst = dst + dstsiz;
const char *const esrc = srclen ? src + srclen : NULL;
while (src < esrc && *src && *src != endquote && dst < edst) {
switch (*src) {
case '\\':
++src;
unsigned char d;
switch (*src) {
case '\0': d = '\\'; break;
case '0': d = '\0'; ++src; break;
case 'n': d = '\n'; ++src; break;
case 'r': d = '\r'; ++src; break;
case 't': d = '\t'; ++src; break;
case 'x':
if (isxdigit(src[1]) && isxdigit(src[2])) {
++src;
fromhex(&d, src, 1);
src += 2;
break;
}
// fall through
default:
d = *src++;
break;
}
*dst++ = d;
break;
default:
*dst++ = *src++;
break;
}
}
if (afterp)
*afterp = src;
return dst - odst;
}
/* Return true if the string resembles a URI.
* Based on RFC-3986 generic syntax, assuming nothing about the hierarchical part.
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int str_is_uri(const char *uri)
{
const char *p;
size_t len;
if (!str_uri_scheme(uri, &p, &len))
return 0;
const char *const q = (p += len + 1);
for (; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (p == q)
return 0;
if (*p == '?')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (*p == '#')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
return !*p;
}
int str_uri_scheme(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
// Scheme is ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
if (!isalpha(*p++))
return 0;
while (is_uri_char_scheme(*p))
++p;
// Scheme is followed by colon ":".
if (*p != ':')
return 0;
if (partp)
*partp = uri;
if (lenp)
*lenp = p - uri;
return 1;
}
int str_uri_hierarchical(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != ':')
++p;
if (*p != ':')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#')
++p;
if (p == q)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_query(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '?')
++p;
if (*p != '?')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '#')
++p;
if (p == q || (*p && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_fragment(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '#')
++p;
if (*p != '#')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)))
++p;
if (p == q || *p)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_authority(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *const q = hier + 2;
const char *p = q;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_path(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *p = hier + 2;
while (*p && *p != '/' && *p != '?' && *p != '#')
++p;
if (!*p)
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_username(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
if (partp)
*partp = auth;
if (lenp)
*lenp = p - auth;
return 1;
}
int str_uri_authority_password(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
const char *const q = ++p;
for (; *p && *p != '@'; ++p)
;
assert(*p == '@');
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_hostname(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':')
p = r;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_port(const char *auth, uint16_t *portp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':') {
for (++r; *r == '0'; ++r)
;
unsigned int n;
if (p - r <= 5 && (n = atoi(r)) <= USHRT_MAX) {
*portp = n;
return 1;
}
}
return 0;
}
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