nostrdb: move everything to src

Signed-off-by: William Casarin <jb55@jb55.com>

nostrdb/src/hex.h

@@ -0,0 +1,68 @@
+
+#ifndef HEX_H
+#define HEX_H
+
+#include <stdlib.h>
+
+static const char hex_table[256] = {
+    ['0'] = 0, ['1'] = 1, ['2'] = 2, ['3'] = 3,
+    ['4'] = 4, ['5'] = 5, ['6'] = 6, ['7'] = 7,
+    ['8'] = 8, ['9'] = 9, ['a'] = 10, ['b'] = 11,
+    ['c'] = 12, ['d'] = 13, ['e'] = 14, ['f'] = 15,
+    ['A'] = 10, ['B'] = 11, ['C'] = 12, ['D'] = 13,
+    ['E'] = 14, ['F'] = 15
+};
+
+static inline int char_to_hex(unsigned char *val, unsigned char c)
+{
+	if (hex_table[c] || c == '0') {
+		*val = hex_table[c];
+		return 1;
+	}
+	return 0;
+}
+
+static inline int hex_decode(const char *str, size_t slen, void *buf, size_t bufsize)
+{
+	unsigned char v1, v2;
+	unsigned char *p = buf;
+
+	while (slen > 1) {
+		if (!char_to_hex(&v1, str[0]) || !char_to_hex(&v2, str[1]))
+			return 0;
+		if (!bufsize)
+			return 0;
+		*(p++) = (v1 << 4) | v2;
+		str += 2;
+		slen -= 2;
+		bufsize--;
+	}
+	return slen == 0 && bufsize == 0;
+}
+
+
+static inline char hexchar(unsigned int val)
+{
+	if (val < 10)
+		return '0' + val;
+	if (val < 16)
+		return 'a' + val - 10;
+	abort();
+}
+
+static int hex_encode(const void *buf, size_t bufsize, char *dest)
+{
+	size_t i;
+
+	for (i = 0; i < bufsize; i++) {
+		unsigned int c = ((const unsigned char *)buf)[i];
+		*(dest++) = hexchar(c >> 4);
+		*(dest++) = hexchar(c & 0xF);
+	}
+	*dest = '\0';
+
+	return 1;
+}
+
+
+#endif