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authorTimo Teras <timo.teras@iki.fi>2009-07-15 14:48:57 +0300
committerTimo Teras <timo.teras@iki.fi>2009-07-15 14:48:57 +0300
commita7c5fda40ac76c4a43af7a4ee5241514f890a2ee (patch)
tree0e7bec51c3b7e5e16fc805bc885e348c78e5404e /src/blob.c
parentbfabf8f8d966ab8305212b9730db8fc5eb5e1094 (diff)
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blob: base64 encoding and decoding
and prefer sha1 checksums to be stored in base64 encoded format.
Diffstat (limited to 'src/blob.c')
-rw-r--r--src/blob.c144
1 files changed, 127 insertions, 17 deletions
diff --git a/src/blob.c b/src/blob.c
index ed7f418..0b6efbf 100644
--- a/src/blob.c
+++ b/src/blob.c
@@ -186,14 +186,6 @@ void apk_blob_push_uint(apk_blob_t *to, unsigned int value, int radix)
apk_blob_push_blob(to, APK_BLOB_PTR_PTR(ptr+1, &buf[sizeof(buf)-1]));
}
-static int checksum_char_to_id(char chr)
-{
- switch (chr) {
- case '1': return APK_CHECKSUM_SHA1;
- }
- return APK_CHECKSUM_NONE;
-}
-
void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum)
{
switch (csum->type) {
@@ -201,8 +193,8 @@ void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum)
apk_blob_push_hexdump(to, APK_BLOB_CSUM(*csum));
break;
case APK_CHECKSUM_SHA1:
- apk_blob_push_blob(to, APK_BLOB_STR("X1"));
- apk_blob_push_hexdump(to, APK_BLOB_CSUM(*csum));
+ apk_blob_push_blob(to, APK_BLOB_STR("Q1"));
+ apk_blob_push_base64(to, APK_BLOB_CSUM(*csum));
break;
default:
*to = APK_BLOB_NULL;
@@ -231,6 +223,42 @@ void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary)
to->len -= binary.len * 2;
}
+static const char b64encode[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static inline void push_b64_chunk(unsigned char *to, const unsigned char *from, int len)
+{
+ to[0] = b64encode[from[0] >> 2];
+ to[1] = b64encode[((from[0] & 0x03) << 4) | ((from[1] & 0xf0) >> 4)];
+ to[2] = len < 2 ? '=' : b64encode[((from[1] & 0x0f) << 2) |
+ ((from[2] & 0xc0) >> 6)];
+ to[3] = len < 3 ? '=' : b64encode[from[2] & 0x3f ];
+}
+
+void apk_blob_push_base64(apk_blob_t *to, apk_blob_t binary)
+{
+ unsigned char *src = (unsigned char *) binary.ptr;
+ unsigned char *dst = (unsigned char *) to->ptr;
+ int i, needed;
+
+ if (unlikely(APK_BLOB_IS_NULL(*to)))
+ return;
+
+ needed = ((binary.len + 2) / 3) * 4;
+ if (unlikely(to->len < needed)) {
+ *to = APK_BLOB_NULL;
+ return;
+ }
+
+ for (i = 0; i < binary.len / 3; i++, src += 3, dst += 4)
+ push_b64_chunk(dst, src, 4);
+ i = binary.len % 3;
+ if (i != 0)
+ push_b64_chunk(dst, src, i);
+ to->ptr += needed;
+ to->len -= needed;
+}
+
void apk_blob_pull_char(apk_blob_t *b, int expected)
{
if (unlikely(APK_BLOB_IS_NULL(*b)))
@@ -265,6 +293,8 @@ unsigned int apk_blob_pull_uint(apk_blob_t *b, int radix)
void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum)
{
+ int encoding;
+
if (unlikely(APK_BLOB_IS_NULL(*b)))
return;
@@ -273,18 +303,35 @@ void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum)
return;
}
- switch (b->ptr[0]) {
- case 'X':
- csum->type = checksum_char_to_id(b->ptr[1]);
- b->ptr += 2;
- b->len -= 2;
+ if (dx(b->ptr[0]) != -1) {
+ /* Assume MD5 for backwards compatibility */
+ csum->type = APK_CHECKSUM_MD5;
apk_blob_pull_hexdump(b, APK_BLOB_CSUM(*csum));
+ return;
+ }
+
+ encoding = b->ptr[0];
+ switch (b->ptr[1]) {
+ case '1':
+ csum->type = APK_CHECKSUM_SHA1;
break;
default:
- /* Assume MD5 for backwards compatibility */
- csum->type = APK_CHECKSUM_MD5;
+ *b = APK_BLOB_NULL;
+ return;
+ }
+ b->ptr += 2;
+ b->len -= 2;
+
+ switch (encoding) {
+ case 'X':
apk_blob_pull_hexdump(b, APK_BLOB_CSUM(*csum));
break;
+ case 'Q':
+ apk_blob_pull_base64(b, APK_BLOB_CSUM(*csum));
+ break;
+ default:
+ *b = APK_BLOB_NULL;
+ break;
}
}
@@ -314,3 +361,66 @@ void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to)
err:
*b = APK_BLOB_NULL;
}
+
+static unsigned char b64decode[] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
+ 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
+ 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+ 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
+ 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
+ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+ 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+static inline int pull_b64_chunk(unsigned char *to, const unsigned char *from, int len)
+{
+ unsigned char tmp[4];
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ if (unlikely(from[i] >= 0x80))
+ return -1;
+ tmp[i] = b64decode[from[i]];
+ if (unlikely(tmp[i] == 0xff))
+ return -1;
+ }
+
+ to[0] = (tmp[0] << 2 | tmp[1] >> 4);
+ if (len > 1)
+ to[1] = (tmp[1] << 4 | tmp[2] >> 2);
+ else if (unlikely(from[2] != '='))
+ return -1;
+ if (len > 2)
+ to[2] = (((tmp[2] << 6) & 0xc0) | tmp[3]);
+ else if (unlikely(from[3] != '='))
+ return -1;
+ return 0;
+}
+
+void apk_blob_pull_base64(apk_blob_t *b, apk_blob_t to)
+{
+ unsigned char *src = (unsigned char *) b->ptr;
+ unsigned char *dst = (unsigned char *) to.ptr;
+ int i, needed;
+
+ if (unlikely(APK_BLOB_IS_NULL(*b)))
+ return;
+
+ needed = ((to.len + 2) / 3) * 4;
+ if (unlikely(b->len < needed)) {
+ *b = APK_BLOB_NULL;
+ return;
+ }
+
+ for (i = 0; i < to.len / 3; i++, src += 4, dst += 3)
+ pull_b64_chunk(dst, src, 4);
+ i = to.len % 3;
+ if (i != 0)
+ pull_b64_chunk(dst, src, i);
+ b->ptr += needed;
+ b->len -= needed;
+}