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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2022-11-18 00:57:01 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2022-11-18 00:58:13 +0100
commit844fdd42f03a633f1dbce5d90b2ecf44698cf8b0 (patch)
tree1255d42327bb297b12dfd4e7adfd81e3fbea6762 /bin
parentda6eadc840716eb29b0175f39b2790bba166db4a (diff)
Add a single, central base64 decoder
Similar to the hex blob decoder, we need this once for tar and once for the filemap xattr parser. Simply add a single, central implementation to libutil, with a simple unit test, and then use it in both libtar and gensquashfs. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'bin')
-rw-r--r--bin/gensquashfs/filemap_xattr.c86
1 files changed, 8 insertions, 78 deletions
diff --git a/bin/gensquashfs/filemap_xattr.c b/bin/gensquashfs/filemap_xattr.c
index 059ce81..0b73d36 100644
--- a/bin/gensquashfs/filemap_xattr.c
+++ b/bin/gensquashfs/filemap_xattr.c
@@ -11,25 +11,6 @@
#define NEW_FILE_START "# file: "
// Taken from attr-2.5.1/tools/setfattr.c
-static int
-base64_digit(char c) {
- if (c >= 'A' && c <= 'Z')
- return c - 'A';
- else if (c >= 'a' && c <= 'z')
- return 26 + c - 'a';
- else if (c >= '0' && c <= '9')
- return 52 + c - '0';
- else if (c == '+')
- return 62;
- else if (c == '/')
- return 63;
- else if (c == '=')
- return -2;
- else
- return -1;
-}
-
-// Taken from attr-2.5.1/tools/setfattr.c
static char *
decode(const char *value, size_t *size) {
char *decoded = NULL;
@@ -50,71 +31,20 @@ decode(const char *value, size_t *size) {
return NULL;
}
} else if (value[0] == '0' && (value[1] == 's' || value[1] == 'S')) {
- const char *v = value + 2, *end = value + *size;
- int d0, d1, d2, d3;
- char *d;
+ size_t input_len = *size - 2;
- decoded = realloc(decoded, *size / 4 * 3);
+ *size = (input_len / 4) * 3;
+
+ decoded = realloc(decoded, *size);
if (decoded == NULL) {
return NULL;
}
- d = decoded;
- for (;;) {
- while (v < end && isspace(*v))
- v++;
- if (v == end) {
- d0 = d1 = d2 = d3 = -2;
- break;
- }
- if (v + 4 > end) {
- bad_base64_encoding:
- free(decoded);
- fprintf(stderr, "bad input encoding\n");
- return NULL;
- }
- d0 = base64_digit(*v++);
- d1 = base64_digit(*v++);
- d2 = base64_digit(*v++);
- d3 = base64_digit(*v++);
- if (d0 < 0 || d1 < 0 || d2 < 0 || d3 < 0)
- break;
- *d++ = (char)((d0 << 2) | (d1 >> 4));
- *d++ = (char)((d1 << 4) | (d2 >> 2));
- *d++ = (char)((d2 << 6) | d3);
- }
- if (d0 == -2) {
- if (d1 != -2 || d2 != -2 || d3 != -2)
- goto bad_base64_encoding;
- goto base64_end;
- }
- if (d0 == -1 || d1 < 0 || d2 == -1 || d3 == -1)
- goto bad_base64_encoding;
- *d++ = (char)((d0 << 2) | (d1 >> 4));
- if (d2 != -2)
- *d++ = (char)((d1 << 4) | (d2 >> 2));
- else {
- if (d1 & 0x0F || d3 != -2)
- goto bad_base64_encoding;
- goto base64_end;
- }
- if (d3 != -2)
- *d++ = (char)((d2 << 6) | d3);
- else if (d2 & 0x03)
- goto bad_base64_encoding;
- base64_end:
- while (v < end && isspace(*v))
- v++;
- if (v + 4 <= end && *v == '=') {
- if (*++v != '=' || *++v != '=' || *++v != '=')
- goto bad_base64_encoding;
- v++;
+ if (base64_decode(value + 2, input_len, decoded, size)) {
+ free(decoded);
+ fprintf(stderr, "bad input encoding\n");
+ return NULL;
}
- while (v < end && isspace(*v))
- v++;
- if (v < end)
- goto bad_base64_encoding;
- *size = d - decoded;
} else {
const char *v = value, *end = value + *size;
char *d;