mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-12 03:04:57 +00:00
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
#include <stddef.h> /*for size_t*/
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#include <ctype.h> /*for isxdigit*/
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#include <string.h>
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#include "contiki-net.h"
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/*Copied from mangoose http server*/
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size_t
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decode(const char *src, size_t srclen, char *dst, size_t dstlen, int is_form)
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{
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size_t i, j;
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int a, b;
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#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
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for (i = j = 0; i < srclen && j < dstlen - 1; i++, j++) {
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if (src[i] == '%' &&
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isxdigit(* (unsigned char *) (src + i + 1)) &&
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isxdigit(* (unsigned char *) (src + i + 2))) {
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a = tolower(* (unsigned char *) (src + i + 1));
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b = tolower(* (unsigned char *) (src + i + 2));
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dst[j] = ((HEXTOI(a) << 4) | HEXTOI(b)) & 0xff;
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i += 2;
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} else if (is_form && src[i] == '+') {
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dst[j] = ' ';
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} else {
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dst[j] = src[i];
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}
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}
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dst[j] = '\0'; /* Null-terminate the destination */
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return ( i == srclen );
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}
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/*Copied from mangoose http server*/
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int
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get_variable(const char *name, const char *buffer, size_t buflen, char* output, size_t output_len, int decode_type)
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{
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const char *start = NULL, *end = NULL, *end_of_value;
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size_t var_len = 0;
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/*initialize the output buffer first*/
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*output = 0;
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var_len = strlen(name);
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end = buffer + buflen;
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for (start = buffer; start + var_len < end; start++){
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if ((start == buffer || start[-1] == '&') && start[var_len] == '=' &&
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! strncmp(name, start, var_len)) {
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/* Point p to variable value */
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start += var_len + 1;
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/* Point s to the end of the value */
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end_of_value = (const char *) memchr(start, '&', end - start);
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if (end_of_value == NULL) {
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end_of_value = end;
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}
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return decode(start, end_of_value - start, output, output_len, decode_type);
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}
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}
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return 0;
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}
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uint32_t
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read_int(uint8_t *buf, uint8_t size)
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{
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uint32_t data = 0;
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if (size >= 1 && size <= 4) {
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uint8_t *p = (uint8_t *)&data;
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memcpy(p + 4 - size, buf, size);
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}
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return uip_ntohl(data);
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}
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int
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write_int(uint8_t *buf, uint32_t data, uint8_t size)
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{
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int success = 0;
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if (size >= 1 && size <= 4) {
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data = uip_htonl(data);
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memcpy(buf, ((char*)(&data)) + 4 - size, size);
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success = size;
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}
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return success;
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}
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int
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write_variable_int(uint8_t *buf, uint32_t data)
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{
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uint8_t size = 4;
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if (data <= 0xFF) {
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size = 1;
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} else if (data <= 0xFFFF) {
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size = 2;
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} else if (data <= 0xFFFFFF) {
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size = 3;
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}
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return write_int(buf, data, size);
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}
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uint16_t log_2(uint16_t value)
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{
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uint16_t result = 0;
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do {
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value = value >> 1;
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result++;
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} while (value);
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return result ? result - 1 : result;
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}
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