mirror of
https://github.com/estkme-group/lpac
synced 2024-09-11 19:40:49 +02:00
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
#include <string.h>
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#include "base64.h"
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static const char basis_64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static const unsigned char pr2six[256] =
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{
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
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64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
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64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64};
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int euicc_base64_decode_len(const char *bufcoded)
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{
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int nbytesdecoded;
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register const unsigned char *bufin;
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register int nprbytes;
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bufin = (const unsigned char *)bufcoded;
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while (pr2six[*(bufin++)] <= 63)
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;
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nprbytes = (bufin - (const unsigned char *)bufcoded) - 1;
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nbytesdecoded = ((nprbytes + 3) / 4) * 3;
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return nbytesdecoded + 1;
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}
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int euicc_base64_decode(unsigned char *bufplain, const char *bufcoded)
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{
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int nbytesdecoded;
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register const unsigned char *bufin;
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register unsigned char *bufout;
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register int nprbytes;
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bufin = (const unsigned char *)bufcoded;
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while (pr2six[*(bufin++)] <= 63)
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;
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nprbytes = (bufin - (const unsigned char *)bufcoded) - 1;
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nbytesdecoded = ((nprbytes + 3) / 4) * 3;
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bufout = (unsigned char *)bufplain;
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bufin = (const unsigned char *)bufcoded;
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while (nprbytes > 4)
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{
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*(bufout++) =
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(unsigned char)(pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
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*(bufout++) =
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(unsigned char)(pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
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*(bufout++) =
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(unsigned char)(pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
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bufin += 4;
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nprbytes -= 4;
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}
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/* Note: (nprbytes == 1) would be an error, so just ingore that case */
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if (nprbytes > 1)
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{
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*(bufout++) =
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(unsigned char)(pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
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}
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if (nprbytes > 2)
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{
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*(bufout++) =
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(unsigned char)(pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
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}
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if (nprbytes > 3)
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{
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*(bufout++) =
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(unsigned char)(pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
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}
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*(bufout++) = '\0';
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nbytesdecoded -= (4 - nprbytes) & 3;
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return nbytesdecoded;
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}
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int euicc_base64_encode_len(int len)
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{
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return ((len + 2) / 3 * 4) + 1;
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}
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int euicc_base64_encode(char *encoded, const unsigned char *string, int len)
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{
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int i;
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char *p;
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p = encoded;
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for (i = 0; i < len - 2; i += 3)
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{
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*p++ = basis_64[(string[i] >> 2) & 0x3F];
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*p++ = basis_64[((string[i] & 0x3) << 4) |
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((int)(string[i + 1] & 0xF0) >> 4)];
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*p++ = basis_64[((string[i + 1] & 0xF) << 2) |
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((int)(string[i + 2] & 0xC0) >> 6)];
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*p++ = basis_64[string[i + 2] & 0x3F];
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}
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if (i < len)
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{
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*p++ = basis_64[(string[i] >> 2) & 0x3F];
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if (i == (len - 1))
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{
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*p++ = basis_64[((string[i] & 0x3) << 4)];
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*p++ = '=';
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}
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else
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{
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*p++ = basis_64[((string[i] & 0x3) << 4) |
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((int)(string[i + 1] & 0xF0) >> 4)];
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*p++ = basis_64[((string[i + 1] & 0xF) << 2)];
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}
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*p++ = '=';
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}
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*p++ = '\0';
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return p - encoded;
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}
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