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add hex_decode() to String

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bendn 2023-03-06 10:17:33 +07:00
parent 44d539465a
commit ca0feabbb0
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6 changed files with 88 additions and 0 deletions
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29
core/string/ustring.cpp
View File

@ -1644,6 +1644,35 @@ String String::hex_encode_buffer(const uint8_t *p_buffer, int p_len) {
return ret;
}
Vector<uint8_t> String::hex_decode() const {
ERR_FAIL_COND_V_MSG(length() % 2 != 0, Vector<uint8_t>(), "Hexadecimal string of uneven length.");
#define HEX_TO_BYTE(m_output, m_index) \
uint8_t m_output; \
c = operator[](m_index); \
if (is_digit(c)) { \
m_output = c - '0'; \
} else if (c >= 'a' && c <= 'f') { \
m_output = c - 'a' + 10; \
} else if (c >= 'A' && c <= 'F') { \
m_output = c - 'A' + 10; \
} else { \
ERR_FAIL_V_MSG(Vector<uint8_t>(), "Invalid hexadecimal character \"" + chr(c) + "\" at index " + m_index + "."); \
}
Vector<uint8_t> out;
int len = length() / 2;
out.resize(len);
for (int i = 0; i < len; i++) {
char32_t c;
HEX_TO_BYTE(first, i * 2);
HEX_TO_BYTE(second, i * 2 + 1);
out.write[i] = first * 16 + second;
}
return out;
#undef HEX_TO_BYTE
}
void String::print_unicode_error(const String &p_message, bool p_critical) const {
if (p_critical) {
print_error(vformat("Unicode parsing error, some characters were replaced with spaces: %s", p_message));

2
core/string/ustring.h
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@ -321,6 +321,8 @@ public:
static String chr(char32_t p_char);
static String md5(const uint8_t *p_md5);
static String hex_encode_buffer(const uint8_t *p_buffer, int p_len);
Vector<uint8_t> hex_decode() const;
bool is_numeric() const;
double to_float() const;

1
core/variant/variant_call.cpp
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@ -1734,6 +1734,7 @@ static void _register_variant_builtin_methods() {
bind_string_method(to_utf8_buffer, sarray(), varray());
bind_string_method(to_utf16_buffer, sarray(), varray());
bind_string_method(to_utf32_buffer, sarray(), varray());
bind_string_method(hex_decode, sarray(), varray());
bind_string_method(to_wchar_buffer, sarray(), varray());
bind_static_method(String, num_scientific, sarray("number"), varray());

18
doc/classes/String.xml
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@ -313,6 +313,24 @@
[b]Note:[/b] Strings with equal hash values are [i]not[/i] guaranteed to be the same, as a result of hash collisions. On the countrary, strings with different hash values are guaranteed to be different.
</description>
</method>
<method name="hex_decode" qualifiers="const">
<return type="PackedByteArray" />
<description>
Decodes a hexadecimal string as a [PackedByteArray].
[codeblocks]
[gdscript]
var text = "hello world"
var encoded = text.to_utf8_buffer().hex_encode() # outputs "68656c6c6f20776f726c64"
print(buf.hex_decode().get_string_from_utf8())
[/gdscript]
[csharp]
var text = "hello world";
var encoded = text.ToUtf8Buffer().HexEncode(); # outputs "68656c6c6f20776f726c64"
GD.Print(buf.HexDecode().GetStringFromUtf8());
[/csharp]
[/codeblocks]
</description>
</method>
<method name="hex_to_int" qualifiers="const">
<return type="int" />
<description>

18
doc/classes/StringName.xml
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@ -296,6 +296,24 @@
[b]Note:[/b] Strings with equal hash values are [i]not[/i] guaranteed to be the same, as a result of hash collisions. On the countrary, strings with different hash values are guaranteed to be different.
</description>
</method>
<method name="hex_decode" qualifiers="const">
<return type="PackedByteArray" />
<description>
Decodes a hexadecimal string as a [PackedByteArray].
[codeblocks]
[gdscript]
var text = "hello world"
var encoded = text.to_utf8_buffer().hex_encode() # outputs "68656c6c6f20776f726c64"
print(buf.hex_decode().get_string_from_utf8())
[/gdscript]
[csharp]
var text = "hello world";
var encoded = text.ToUtf8Buffer().HexEncode(); # outputs "68656c6c6f20776f726c64"
GD.Print(buf.HexDecode().GetStringFromUtf8());
[/csharp]
[/codeblocks]
</description>
</method>
<method name="hex_to_int" qualifiers="const">
<return type="int" />
<description>

20
modules/mono/glue/GodotSharp/GodotSharp/Core/StringExtensions.cs
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@ -728,6 +728,26 @@ namespace Godot
return hash;
}
/// <summary>
/// Decodes a hexadecimal string.
/// </summary>
/// <param name="instance">The hexadecimal string.</param>
/// <returns>The byte array representation of this string.</returns>
public static byte[] HexDecode(this string instance)
{
if (instance.Length % 2 != 0)
{
throw new ArgumentException("Hexadecimal string of uneven length.", nameof(instance));
}
int len = instance.Length / 2;
byte[] ret = new byte[len];
for (int i = 0; i < len; i++)
{
ret[i] = (byte)int.Parse(instance.AsSpan(i * 2, 2), NumberStyles.AllowHexSpecifier);
}
return ret;
}
/// <summary>
/// Returns a hexadecimal representation of this byte as a string.
/// </summary>