contiki/apps/rest-common/rest-util.c

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2.6 KiB
C
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#include <stddef.h> /*for size_t*/
#include <ctype.h> /*for isxdigit*/
#include <string.h>
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#include "contiki-net.h"
/*Copied from mangoose http server*/
size_t
decode(const char *src, size_t srclen, char *dst, size_t dstlen, int is_form)
{
size_t i, j;
int a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < srclen && j < dstlen - 1; i++, j++) {
if (src[i] == '%' &&
isxdigit(* (unsigned char *) (src + i + 1)) &&
isxdigit(* (unsigned char *) (src + i + 2))) {
a = tolower(* (unsigned char *) (src + i + 1));
b = tolower(* (unsigned char *) (src + i + 2));
dst[j] = ((HEXTOI(a) << 4) | HEXTOI(b)) & 0xff;
i += 2;
} else if (is_form && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; /* Null-terminate the destination */
return ( i == srclen );
}
/*Copied from mangoose http server*/
int
get_variable(const char *name, const char *buffer, size_t buflen, char* output, size_t output_len, int decode_type)
{
const char *start = NULL, *end = NULL, *end_of_value;
size_t var_len = 0;
/*initialize the output buffer first*/
*output = 0;
var_len = strlen(name);
end = buffer + buflen;
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for (start = buffer; start + var_len < end; start++){
if ((start == buffer || start[-1] == '&') && start[var_len] == '=' &&
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! strncmp(name, start, var_len)) {
/* Point p to variable value */
start += var_len + 1;
/* Point s to the end of the value */
end_of_value = (const char *) memchr(start, '&', end - start);
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if (end_of_value == NULL) {
end_of_value = end;
}
return decode(start, end_of_value - start, output, output_len, decode_type);
}
}
return 0;
}
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uint32_t
read_int(uint8_t *buf, uint8_t size)
{
uint32_t data = 0;
if (size >= 1 && size <= 4) {
uint8_t *p = (uint8_t *)&data;
memcpy(p + 4 - size, buf, size);
}
return uip_ntohl(data);
}
int
write_int(uint8_t *buf, uint32_t data, uint8_t size)
{
int success = 0;
if (size >= 1 && size <= 4) {
data = uip_htonl(data);
memcpy(buf, ((char*)(&data)) + 4 - size, size);
success = size;
}
return success;
}
int
write_variable_int(uint8_t *buf, uint32_t data)
{
uint8_t size = 4;
if (data <= 0xFF) {
size = 1;
} else if (data <= 0xFFFF) {
size = 2;
} else if (data <= 0xFFFFFF) {
size = 3;
}
return write_int(buf, data, size);
}
uint16_t log_2(uint16_t value)
{
uint16_t result = 0;
do {
value = value >> 1;
result++;
} while (value);
return result ? result - 1 : result;
}