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base64.obj: decoding algorithm skips spaces, newlines and tabs

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git-svn-id: svn://kolibrios.org@9637 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Anton Krotov 2022-01-15 05:31:50 +00:00
parent 09089615eb
commit 40faa04f49
1 changed files with 32 additions and 30 deletions
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62
programs/develop/libraries/base64/base64.c
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@ -65,39 +65,41 @@ return j+1;
int base64_decode(char inp[], char outp[], int len) int base64_decode(char inp[], char outp[], int len)
{ {
int i, j, k; int i, j, k, n;
char chr[4]; char *chr_adr;
char chr[4];
for (i = 0, j=-1, k=0; i < len; i+=4) i = 0;
{ j = -1;
chr[0] = strchr(base64_table, inp[i]) - base64_table; k = 0;
while (i < len)
{
for (n = 0; n <= 3; n++)
{
chr[n] = 0;
while ((inp[i] <= 0x20) & (i < len))
i++;
if (i < len)
{
if ((n >= 2) & (inp[i] == '='))
k++;
else
{
chr_adr = strchr(base64_table, inp[i]);
if (chr_adr)
chr[n] = chr_adr - base64_table;
}
i++;
}
}
outp[++j] = ((chr[0] << 2) | (chr[1] >> 4));
outp[++j] = ((chr[1] << 4) | (chr[2] >> 2));
outp[++j] = ((chr[2] & 0x03 )<< 6) | (chr[3] & 0x3f);
}
chr[1] = strchr(base64_table, inp[i+1]) - base64_table; outp[j+1-k] = '\0';
if (inp[i+2] == '=') return j+1-k;
{
chr[2] = 0;
k++;
}
else
chr[2] = strchr(base64_table, inp[i+2]) - base64_table;
if (inp[i+3] == '=')
{
chr[3] = 0;
k++;
}
else
chr[3] = strchr(base64_table, inp[i+3]) - base64_table;
outp[++j] = ((chr[0] << 2) | (chr[1] >> 4));
outp[++j] = ((chr[1] << 4) | (chr[2] >> 2));
outp[++j] = ((chr[2] & 0x03 )<< 6) | (chr[3] & 0x3f);
}
outp[j+1-k] = '\0';
return j+1-k;
} }
///=============== ///===============