add str_replace_byte

src/string.c

@@ -93,36 +93,50 @@ S64 str_index(Str haystack, Str needle)
     return -1;
 }
 
+
+
+static INLINE S16 char_hex_to_binary(U8 c)
+{
+    if (c >='0' && c <='9')
+        return c - '0';
+    else if (c >= 'A' && c <= 'F')
+        return c - 'A' + 10;
+    else if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+
+    return -1;
+}
+
 static const char hex_chars[] = "0123456789ABCDEF";
 
-Str str_hex_encode(Str source, Str destination)
+Str str_hex_encode(Str binary_data, Str hex_result)
 {
-    Assert(destination.len  >= source.len * 2);
-    U32 hex_len = source.len * 2;
-    for (U32 i = 0, t = 0; i < source.len; ++i,t+=2) {
+    Assert(hex_result.len  >= binary_data.len * 2);
+    U32 hex_len = binary_data.len * 2;
+    for (U32 i = 0, t = 0; i < binary_data.len; ++i,t+=2) {
         U8 high_nibble;
         U8 low_nibble;
 
-        high_nibble = (source.str[i] & 0xF0) >> 4 ;
-        low_nibble =  source.str[i] & 0x0F ;
+        high_nibble = (binary_data.str[i] & 0xF0) >> 4 ;
+        low_nibble =  binary_data.str[i] & 0x0F ;
 
-        destination.str[t]   = hex_chars[high_nibble];
-        destination.str[t+1] = hex_chars[low_nibble];
+        hex_result.str[t]   = hex_chars[high_nibble];
+        hex_result.str[t+1] = hex_chars[low_nibble];
     }
 
-    destination.len = hex_len;
-    return destination;
+    hex_result.len = hex_len;
+    return hex_result;
 }
 
-Str str_hex_decode(Str source, Str destination)
+Str str_hex_decode(Str hex_str, Str result)
 {
-    Assert(destination.len >= source.len/2);
+    Assert(result.len >= hex_str.len/2);
     U32 dest_pos = 0;
     U32 source_pos = 0;
 
-    while (source_pos + 1 < source.len) {
+    while (source_pos + 1 < hex_str.len) {
 
-        if (char_is_ascii_whitespace(source.str[source_pos])) {
+        if (char_is_ascii_whitespace(hex_str.str[source_pos])) {
             source_pos++;
             continue;
         }
@@ -130,20 +144,20 @@ Str str_hex_decode(Str source, Str destination)
         S16 high_nibble;
         S16 low_nibble;
 
-        high_nibble = char_hex_to_binary(source.str[source_pos]);
-        low_nibble = char_hex_to_binary(source.str[source_pos + 1]);
+        high_nibble = char_hex_to_binary(hex_str.str[source_pos]);
+        low_nibble = char_hex_to_binary(hex_str.str[source_pos + 1]);
         if (high_nibble == -1 || low_nibble == -1) {
-            destination.len = 0;
-            return destination;
+            result.len = 0;
+            return result;
         }
 
-        destination.str[dest_pos] = (high_nibble << 4 ) | low_nibble;
+        result.str[dest_pos] = (high_nibble << 4 ) | low_nibble;
         source_pos += 2;
         dest_pos++;
     }
 
-    destination.len = dest_pos;
-    return destination;
+    result.len = dest_pos;
+    return result;
 }
 // split @str on any byte in @separators, place split strings in @vec
 void str_split(Str str, Str separators, StrVec *vec)