73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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long
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EncodeInteger(
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unsigned char * pbEncoded,
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unsigned char * pbInt,
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unsigned long dwLen,
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int Writeflag)
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{
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long count;
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unsigned long i;
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long j;
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if (Writeflag)
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pbEncoded[0] = 0x02;
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count = 1;
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i = dwLen - 1;
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// find the most significant non-zero unsigned char
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while ((pbInt[i] == 0) && (i > 0))
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i--;
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if ((i == 0) && (pbInt[i] == 0))
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// this means that the integer value is 0
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{
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if (Writeflag)
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{
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pbEncoded[1] = 0x01;
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pbEncoded[2] = 0x00;
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}
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count += 2;
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}
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else
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{
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// if the most significant bit of the most sig unsigned char is set
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// then need to add a 0 unsigned char to the beginning.
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if (pbInt[i] > 0x7F)
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{
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// encode the length
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count += EncodeLength (pbEncoded + count, i+2, Writeflag);
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if (Writeflag)
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{
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// set the first unsigned char of the integer to zero and increment count
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pbEncoded[count++] = 0x00;
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// copy the integer unsigned chars into the encoded buffer
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j = i;
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while (j >= 0)
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pbEncoded[count++] = pbInt[j--];
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}
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}
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else
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{
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// encode the length
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count += EncodeLength (pbEncoded + count, i+1, Writeflag);
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// copy the integer unsigned chars into the encoded buffer
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if (Writeflag)
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{
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j = i;
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while (j >= 0)
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pbEncoded[count++] = pbInt[j--];
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}
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}
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}
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return (count);
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}
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