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-rw-r--r--src/basic/util.c174
-rw-r--r--src/basic/util.h5
-rw-r--r--src/test/test-util.c100
3 files changed, 279 insertions, 0 deletions
diff --git a/src/basic/util.c b/src/basic/util.c
index 61dd6c4227..bc917ae574 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -954,6 +954,180 @@ int unhexmem(const char *p, size_t l, void **mem, size_t *len) {
return 0;
}
+/* https://tools.ietf.org/html/rfc4648#section-4 */
+char base64char(int x) {
+ static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+ return table[x & 63];
+}
+
+int unbase64char(char c) {
+ unsigned offset;
+
+ if (c >= 'A' && c <= 'Z')
+ return c - 'A';
+
+ offset = 'Z' - 'A' + 1;
+
+ if (c >= 'a' && c <= 'z')
+ return c - 'a' + offset;
+
+ offset += 'z' - 'a' + 1;
+
+ if (c >= '0' && c <= '9')
+ return c - '0' + offset;
+
+ offset += '9' - '0' + 1;
+
+ if (c == '+')
+ return offset;
+
+ offset ++;
+
+ if (c == '/')
+ return offset;
+
+ return -EINVAL;
+}
+
+char *base64mem(const void *p, size_t l) {
+ char *r, *z;
+ const uint8_t *x;
+
+ /* three input bytes makes four output bytes, padding is added so we must round up */
+ z = r = malloc(4 * (l + 2) / 3 + 1);
+ if (!r)
+ return NULL;
+
+ for (x = p; x < (const uint8_t*) p + (l / 3) * 3; x += 3) {
+ /* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ */
+ *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
+ *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
+ *(z++) = base64char((x[1] & 15) << 2 | x[2] >> 6); /* 00YYYYZZ */
+ *(z++) = base64char(x[2] & 63); /* 00ZZZZZZ */
+ }
+
+ switch (l % 3) {
+ case 2:
+ *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
+ *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
+ *(z++) = base64char((x[1] & 15) << 2); /* 00YYYY00 */
+ *(z++) = '=';
+
+ break;
+ case 1:
+ *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
+ *(z++) = base64char((x[0] & 3) << 4); /* 00XX0000 */
+ *(z++) = '=';
+ *(z++) = '=';
+
+ break;
+ }
+
+ *z = 0;
+ return r;
+}
+
+int unbase64mem(const char *p, size_t l, void **mem, size_t *_len) {
+ _cleanup_free_ uint8_t *t = NULL;
+ int a, b, c, d;
+ uint8_t *r, *z;
+ const char *x;
+ size_t len;
+
+ assert(p);
+
+ /* padding ensures any base63 input has input divisible by 4 */
+ if (l % 4 != 0)
+ return -EINVAL;
+
+ /* strip the padding */
+ if (l > 0 && p[l - 1] == '=')
+ l --;
+ if (l > 0 && p[l - 1] == '=')
+ l --;
+
+ /* a group of four input bytes needs three output bytes, in case of
+ padding we need to add two or three extra bytes */
+ len = (l / 4) * 3 + (l % 4 ? (l % 4) - 1 : 0);
+
+ z = r = malloc(len + 1);
+ if (!r)
+ return -ENOMEM;
+
+ for (x = p; x < p + (l / 4) * 4; x += 4) {
+ /* a == 00XXXXXX; b == 00YYYYYY; c == 00ZZZZZZ; d == 00WWWWWW */
+ a = unbase64char(x[0]);
+ if (a < 0)
+ return -EINVAL;
+
+ b = unbase64char(x[1]);
+ if (b < 0)
+ return -EINVAL;
+
+ c = unbase64char(x[2]);
+ if (c < 0)
+ return -EINVAL;
+
+ d = unbase64char(x[3]);
+ if (d < 0)
+ return -EINVAL;
+
+ *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
+ *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
+ *(z++) = (uint8_t) c << 6 | (uint8_t) d; /* ZZWWWWWW */
+ }
+
+ switch (l % 4) {
+ case 3:
+ a = unbase64char(x[0]);
+ if (a < 0)
+ return -EINVAL;
+
+ b = unbase64char(x[1]);
+ if (b < 0)
+ return -EINVAL;
+
+ c = unbase64char(x[2]);
+ if (c < 0)
+ return -EINVAL;
+
+ /* c == 00ZZZZ00 */
+ if (c & 3)
+ return -EINVAL;
+
+ *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
+ *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
+
+ break;
+ case 2:
+ a = unbase64char(x[0]);
+ if (a < 0)
+ return -EINVAL;
+
+ b = unbase64char(x[1]);
+ if (b < 0)
+ return -EINVAL;
+
+ /* b == 00YY0000 */
+ if (b & 15)
+ return -EINVAL;
+
+ *(z++) = (uint8_t) a << 2 | (uint8_t) (b >> 4); /* XXXXXXYY */
+
+ break;
+ }
+
+ *z = 0;
+
+ *mem = r;
+ r = NULL;
+ *_len = len;
+
+ return 0;
+}
+
char octchar(int x) {
return '0' + (x & 7);
}
diff --git a/src/basic/util.h b/src/basic/util.h
index ea77907f7f..dae43006e4 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -240,6 +240,8 @@ char octchar(int x) _const_;
int unoctchar(char c) _const_;
char decchar(int x) _const_;
int undecchar(char c) _const_;
+char base64char(int x) _const_;
+int unbase64char(char c) _const_;
char *cescape(const char *s);
size_t cescape_char(char c, char *buf);
@@ -616,6 +618,9 @@ static inline void *mempset(void *s, int c, size_t n) {
char *hexmem(const void *p, size_t l);
int unhexmem(const char *p, size_t l, void **mem, size_t *len);
+char *base64mem(const void *p, size_t l);
+int unbase64mem(const char *p, size_t l, void **mem, size_t *len);
+
char *strextend(char **x, ...) _sentinel_;
char *strrep(const char *s, unsigned n);
diff --git a/src/test/test-util.c b/src/test/test-util.c
index f7949ebaac..72fbc345c2 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -390,6 +390,24 @@ static void test_unhexchar(void) {
assert_se(unhexchar('0') == 0x0);
}
+static void test_base64char(void) {
+ assert_se(base64char(0) == 'A');
+ assert_se(base64char(26) == 'a');
+ assert_se(base64char(63) == '/');
+}
+
+static void test_unbase64char(void) {
+ assert_se(unbase64char('A') == 0);
+ assert_se(unbase64char('Z') == 25);
+ assert_se(unbase64char('a') == 26);
+ assert_se(unbase64char('z') == 51);
+ assert_se(unbase64char('0') == 52);
+ assert_se(unbase64char('9') == 61);
+ assert_se(unbase64char('+') == 62);
+ assert_se(unbase64char('/') == 63);
+ assert_se(unbase64char('=') == -EINVAL);
+}
+
static void test_octchar(void) {
assert_se(octchar(00) == '0');
assert_se(octchar(07) == '7');
@@ -434,6 +452,84 @@ static void test_unhexmem(void) {
assert_se(memcmp(hex, hex2, strlen(hex) - 1) == 0);
}
+/* https://tools.ietf.org/html/rfc4648#section-10 */
+static void test_base64mem(void) {
+ char *b64;
+
+ b64 = base64mem("", strlen(""));
+ assert_se(b64);
+ assert_se(streq(b64, ""));
+ free(b64);
+
+ b64 = base64mem("f", strlen("f"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zg=="));
+ free(b64);
+
+ b64 = base64mem("fo", strlen("fo"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zm8="));
+ free(b64);
+
+ b64 = base64mem("foo", strlen("foo"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zm9v"));
+ free(b64);
+
+ b64 = base64mem("foob", strlen("foob"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zm9vYg=="));
+ free(b64);
+
+ b64 = base64mem("fooba", strlen("fooba"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zm9vYmE="));
+ free(b64);
+
+ b64 = base64mem("foobar", strlen("foobar"));
+ assert_se(b64);
+ assert_se(streq(b64, "Zm9vYmFy"));
+ free(b64);
+}
+
+static void test_unbase64mem(void) {
+ void *mem;
+ size_t len;
+
+ assert_se(unbase64mem("", strlen(""), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), ""));
+ free(mem);
+
+ assert_se(unbase64mem("Zg==", strlen("Zg=="), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "f"));
+ free(mem);
+
+ assert_se(unbase64mem("Zm8=", strlen("Zm8="), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "fo"));
+ free(mem);
+
+ assert_se(unbase64mem("Zm9v", strlen("Zm9v"), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "foo"));
+ free(mem);
+
+ assert_se(unbase64mem("Zm9vYg==", strlen("Zm9vYg=="), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "foob"));
+ free(mem);
+
+ assert_se(unbase64mem("Zm9vYmE=", strlen("Zm9vYmE="), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "fooba"));
+ free(mem);
+
+ assert_se(unbase64mem("Zm9vYmFy", strlen("Zm9vYmFy"), &mem, &len) == 0);
+ assert_se(streq(strndupa(mem, len), "foobar"));
+ free(mem);
+
+ assert_se(unbase64mem("A", strlen("A"), &mem, &len) == -EINVAL);
+ assert_se(unbase64mem("A====", strlen("A===="), &mem, &len) == -EINVAL);
+ assert_se(unbase64mem("AAB==", strlen("AAB=="), &mem, &len) == -EINVAL);
+ assert_se(unbase64mem("AAAB=", strlen("AAAB="), &mem, &len) == -EINVAL);
+}
+
static void test_cescape(void) {
_cleanup_free_ char *escaped;
@@ -1828,11 +1924,15 @@ int main(int argc, char *argv[]) {
test_in_charset();
test_hexchar();
test_unhexchar();
+ test_base64char();
+ test_unbase64char();
test_octchar();
test_unoctchar();
test_decchar();
test_undecchar();
test_unhexmem();
+ test_base64mem();
+ test_unbase64mem();
test_cescape();
test_cunescape();
test_foreach_word();
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-04 17:47:37 +0000