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Commits › 0f1a6ef
Add encodings.
Vsevolod Stakhov committed 11 years ago
commit 0f1a6efbfbbaf6d4ebf7262e11babb0bbc708afe
parent 978c557
1 file changed +67 -0
modified libpkg/pkg_checksum.c
@@ -212,17 +212,84 @@ pkg_checksum_hash_sha256(struct pkg_checksum_entry *entries,
	}

}
+ 
/*
+ 
 * We use here z-base32 encoding described here:
+ 
 * http://philzimmermann.com/docs/human-oriented-base-32-encoding.txt
+ 
 */
+ 
static const char b32[]="ybndrfg8ejkmcpqxot1uwisza345h769";
+ 




static void

pkg_checksum_encode_base32(unsigned char *in, size_t inlen,

				char *out, size_t outlen)

{
+ 
	int i, remain = -1, r, x;
+
+ 
	if (outlen < inlen * 8 / 5) {
+ 
		pkg_emit_error("cannot encode base32 as outlen is not sufficient");
+ 
		return;
+ 
	}
+
+ 
	for (i = 0, r = 0; i < inlen; i++) {
+ 
		switch (i % 5) {
+ 
		case 0:
+ 
			/* 8 bits of input and 3 to remain */
+ 
			x = in[i];
+ 
			remain = in[i] >> 5;
+ 
			out[r++] = b32[x & 0x1F];
+ 
			break;
+ 
		case 1:
+ 
			/* 11 bits of input, 1 to remain */
+ 
			x = remain | in[i] << 3;
+ 
			out[r++] = b32[x & 0x1F];
+ 
			out[r++] = b32[x >> 5 & 0x1F];
+ 
			remain = x >> 10;
+ 
			break;
+ 
		case 2:
+ 
			/* 9 bits of input, 4 to remain */
+ 
			x = remain | in[i] << 1;
+ 
			out[r++] = b32[x & 0x1F];
+ 
			remain = x >> 5;
+ 
			break;
+ 
		case 3:
+ 
			/* 12 bits of input, 2 to remain */
+ 
			x = remain | in[i] << 4;
+ 
			out[r++] = b32[x & 0x1F];
+ 
			out[r++] = b32[x >> 5 & 0x1F];
+ 
			remain = x >> 10 & 0x3;
+ 
			break;
+ 
		case 4:
+ 
			/* 10 bits of output, nothing to remain */
+ 
			x = remain | in[i] << 2;
+ 
			out[r++] = b32[x & 0x1F];
+ 
			out[r++] = b32[x >> 5 & 0x1F];
+ 
			remain = -1;
+ 
			break;
+ 
		default:
+ 
			/* Not to be happen */
+ 
			break;
+ 
		}
+ 
	}
+ 
	if (remain >= 0)
+ 
		out[r++] = b32[remain];
+
+ 
	out[r] = 0;

}



static void

pkg_checksum_encode_hex(unsigned char *in, size_t inlen,

				char *out, size_t outlen)

{
+ 
	int i;
+
+ 
	if (outlen < inlen * 2) {
+ 
		pkg_emit_error("cannot encode hex as outlen is not sufficient");
+ 
		return;
+ 
	}
+
+ 
	for (i = 0; i < inlen; i++)
+ 
		sprintf(out + (i * 2), "%02x", in[i]);
+ 
	out[inlen * 2] = '\0';

}