1 files changed, 117 insertions, 0 deletions
diff --git a/client/parse.cpp b/client/parse.cpp
new file mode 100644
index 0000000..223dc5d
--- /dev/null
+++ b/client/parse.cpp
@@ -0,0 +1,117 @@
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "parse.h"
+
+static int parse_str(const char* str, char* data, size_t* size) {
+	char closing = str[0];
+	char escape = false;
+	bool scan = data == NULL;
+	int i = 0;
+	size_t len = strlen(str);
+
+	switch (str[i]) {
+		case '\'':
+			escape = false;
+			break;
+		case '\"':
+			escape = true;
+			break;
+		default:
+			return -i;
+	}
+
+	for (i = 1; i < len && str[i] != '\0'; i++) {
+		char c = str[i];
+
+		if (c == closing) {
+			if (scan) printf("string%s of length %d\n", escape ? " (w/ escape)" : "", i - 1);
+			return i + 1; // +1 for closing quote
+		}
+
+		if (scan) *size += 1;
+	}
+
+	return -i;
+}
+
+static int parse_num(const char* str, char* data, size_t* size) {
+	const char* ifs = IFS;
+	size_t len = strcspn(str, ifs);
+	bool scan = data == NULL;
+	int i = 0;
+	int base = 10;
+	bool bytestring = false;
+
+	const char* colon = strchr(str, ':');
+	if (colon != NULL && colon < str + len) { // byte string
+		base = 16;
+		bytestring = true;
+	} else if (len > 2 && strncmp(str, "0x", 2) == 0) { // hexadecimal prefix
+		base = 16;
+		i += 2;
+	}/* else if (len > 1 && strncmp(str, "0", 1) == 0) { // octal prefix
+		base = 8;
+		i += 1;
+	}*/
+
+	const char* set;
+	// if (base == 8) set = SET_OCT;
+	if (base == 10) set = SET_DEC;
+	if (base == 16) {
+		if (bytestring) set = SET_HEX_STR;
+		else set = SET_HEX;
+	}
+	
+	size_t len_ok = strspn(str + i, set) + i;
+	if (len != len_ok) return -len_ok;
+
+	if (scan) {
+		if (base == 10) *size += 1;
+		else if (base == 16) {
+			if (!bytestring) {
+				*size += (len - i + 1) / 2;
+			} else {
+				for (; colon != NULL && colon < str + len; colon = strchr(str, ':')) {
+					*size += 1;
+				}
+			}
+		}
+	}
+
+	if (scan) printf("number (base %d%s) of length %lu\n", base, bytestring ? " as bytestring" : "", len - i);
+	return len;
+}
+
+int strtodata(const char* str, char** data, size_t* size) {
+	const char* ifs = IFS;
+	*size = 0;
+	size_t i;
+	size_t len = strlen(str);
+
+	for (i = 0; i < len;) {
+		// skip whitespace
+		int run;
+		run = strspn(&str[i], ifs);
+		if (run > 0) printf("skipping whitespace for %d bytes...\n", run);
+		i += run;
+		// end of string
+		if (str[i] == '\0') break;
+
+		if ((run = parse_str(str + i, NULL, size)) > 0) { i += run; continue; }
+		if ((run = parse_num(str + i, NULL, size)) > 0) { i += run; continue; }
+
+		// no format detected
+		return -i + run;
+	}
+	printf("end of string w/o parse errors\n");
+	printf("buffer size is now %lu\n", *size);
+	exit(0);
+
+	*data = (char*) malloc(*size);
+
+	return 0;
+}
+