[Feature #19741] Sync all files in yarp

This commit is the initial sync of all files from ruby/yarp
into ruby/ruby. Notably, it does the following:

* Sync all ruby/yarp/lib/ files to ruby/ruby/lib/yarp
* Sync all ruby/yarp/src/ files to ruby/ruby/yarp/
* Sync all ruby/yarp/test/ files to ruby/ruby/test/yarp

1 files changed, 246 insertions, 0 deletions

diff --git a/yarp/api_pack.c b/yarp/api_pack.c
new file mode 100644
index 0000000000..49d625d06f
--- /dev/null
+++ b/yarp/api_pack.c
@@ -0,0 +1,246 @@
+#include "extension.h"
+
+static VALUE rb_cYARP;
+static VALUE rb_cYARPPack;
+static VALUE rb_cYARPPackDirective;
+static VALUE rb_cYARPPackFormat;
+
+static VALUE v3_2_0_symbol;
+static VALUE pack_symbol;
+static VALUE unpack_symbol;
+
+static VALUE
+pack_type_to_symbol(yp_pack_type type) {
+    switch (type) {
+        case YP_PACK_SPACE:
+            return ID2SYM(rb_intern("SPACE"));
+        case YP_PACK_COMMENT:
+            return ID2SYM(rb_intern("COMMENT"));
+        case YP_PACK_INTEGER:
+            return ID2SYM(rb_intern("INTEGER"));
+        case YP_PACK_UTF8:
+            return ID2SYM(rb_intern("UTF8"));
+        case YP_PACK_BER:
+            return ID2SYM(rb_intern("BER"));
+        case YP_PACK_FLOAT:
+            return ID2SYM(rb_intern("FLOAT"));
+        case YP_PACK_STRING_SPACE_PADDED:
+            return ID2SYM(rb_intern("STRING_SPACE_PADDED"));
+        case YP_PACK_STRING_NULL_PADDED:
+            return ID2SYM(rb_intern("STRING_NULL_PADDED"));
+        case YP_PACK_STRING_NULL_TERMINATED:
+            return ID2SYM(rb_intern("STRING_NULL_TERMINATED"));
+        case YP_PACK_STRING_MSB:
+            return ID2SYM(rb_intern("STRING_MSB"));
+        case YP_PACK_STRING_LSB:
+            return ID2SYM(rb_intern("STRING_LSB"));
+        case YP_PACK_STRING_HEX_HIGH:
+            return ID2SYM(rb_intern("STRING_HEX_HIGH"));
+        case YP_PACK_STRING_HEX_LOW:
+            return ID2SYM(rb_intern("STRING_HEX_LOW"));
+        case YP_PACK_STRING_UU:
+            return ID2SYM(rb_intern("STRING_UU"));
+        case YP_PACK_STRING_MIME:
+            return ID2SYM(rb_intern("STRING_MIME"));
+        case YP_PACK_STRING_BASE64:
+            return ID2SYM(rb_intern("STRING_BASE64"));
+        case YP_PACK_STRING_FIXED:
+            return ID2SYM(rb_intern("STRING_FIXED"));
+        case YP_PACK_STRING_POINTER:
+            return ID2SYM(rb_intern("STRING_POINTER"));
+        case YP_PACK_MOVE:
+            return ID2SYM(rb_intern("MOVE"));
+        case YP_PACK_BACK:
+            return ID2SYM(rb_intern("BACK"));
+        case YP_PACK_NULL:
+            return ID2SYM(rb_intern("NULL"));
+        default:
+            return Qnil;
+    }
+}
+
+static VALUE
+pack_signed_to_symbol(yp_pack_signed signed_type) {
+    switch (signed_type) {
+        case YP_PACK_UNSIGNED:
+            return ID2SYM(rb_intern("UNSIGNED"));
+        case YP_PACK_SIGNED:
+            return ID2SYM(rb_intern("SIGNED"));
+        case YP_PACK_SIGNED_NA:
+            return ID2SYM(rb_intern("SIGNED_NA"));
+        default:
+            return Qnil;
+    }
+}
+
+static VALUE
+pack_endian_to_symbol(yp_pack_endian endian) {
+    switch (endian) {
+        case YP_PACK_AGNOSTIC_ENDIAN:
+            return ID2SYM(rb_intern("AGNOSTIC_ENDIAN"));
+        case YP_PACK_LITTLE_ENDIAN:
+            return ID2SYM(rb_intern("LITTLE_ENDIAN"));
+        case YP_PACK_BIG_ENDIAN:
+            return ID2SYM(rb_intern("BIG_ENDIAN"));
+        case YP_PACK_NATIVE_ENDIAN:
+            return ID2SYM(rb_intern("NATIVE_ENDIAN"));
+        case YP_PACK_ENDIAN_NA:
+            return ID2SYM(rb_intern("ENDIAN_NA"));
+        default:
+            return Qnil;
+    }
+}
+
+static VALUE
+pack_size_to_symbol(yp_pack_size size) {
+    switch (size) {
+        case YP_PACK_SIZE_SHORT:
+            return ID2SYM(rb_intern("SIZE_SHORT"));
+        case YP_PACK_SIZE_INT:
+            return ID2SYM(rb_intern("SIZE_INT"));
+        case YP_PACK_SIZE_LONG:
+            return ID2SYM(rb_intern("SIZE_LONG"));
+        case YP_PACK_SIZE_LONG_LONG:
+            return ID2SYM(rb_intern("SIZE_LONG_LONG"));
+        case YP_PACK_SIZE_8:
+            return ID2SYM(rb_intern("SIZE_8"));
+        case YP_PACK_SIZE_16:
+            return ID2SYM(rb_intern("SIZE_16"));
+        case YP_PACK_SIZE_32:
+            return ID2SYM(rb_intern("SIZE_32"));
+        case YP_PACK_SIZE_64:
+            return ID2SYM(rb_intern("SIZE_64"));
+        case YP_PACK_SIZE_P:
+            return ID2SYM(rb_intern("SIZE_P"));
+        case YP_PACK_SIZE_NA:
+            return ID2SYM(rb_intern("SIZE_NA"));
+        default:
+            return Qnil;
+    }
+}
+
+static VALUE
+pack_length_type_to_symbol(yp_pack_length_type length_type) {
+    switch (length_type) {
+        case YP_PACK_LENGTH_FIXED:
+            return ID2SYM(rb_intern("LENGTH_FIXED"));
+        case YP_PACK_LENGTH_MAX:
+            return ID2SYM(rb_intern("LENGTH_MAX"));
+        case YP_PACK_LENGTH_RELATIVE:
+            return ID2SYM(rb_intern("LENGTH_RELATIVE"));
+        case YP_PACK_LENGTH_NA:
+            return ID2SYM(rb_intern("LENGTH_NA"));
+        default:
+            return Qnil;
+    }
+}
+
+static VALUE
+pack_encoding_to_ruby(yp_pack_encoding encoding) {
+    int index;
+    switch (encoding) {
+        case YP_PACK_ENCODING_ASCII_8BIT:
+            index = rb_ascii8bit_encindex();
+            break;
+        case YP_PACK_ENCODING_US_ASCII:
+            index = rb_usascii_encindex();
+            break;
+        case YP_PACK_ENCODING_UTF_8:
+            index = rb_utf8_encindex();
+            break;
+        default:
+            return Qnil;
+    }
+    return rb_enc_from_encoding(rb_enc_from_index(index));
+}
+
+static VALUE
+pack_parse(VALUE self, VALUE version_symbol, VALUE variant_symbol, VALUE format_string) {
+    if (version_symbol != v3_2_0_symbol) {
+        rb_raise(rb_eArgError, "invalid version");
+    }
+
+    yp_pack_variant variant;
+    if (variant_symbol == pack_symbol) {
+        variant = YP_PACK_VARIANT_PACK;
+    } else if (variant_symbol == unpack_symbol) {
+        variant = YP_PACK_VARIANT_UNPACK;
+    } else {
+        rb_raise(rb_eArgError, "invalid variant");
+    }
+
+    StringValue(format_string);
+
+    const char *format = RSTRING_PTR(format_string);
+    const char *format_end = format + RSTRING_LEN(format_string);
+    yp_pack_encoding encoding = YP_PACK_ENCODING_START;
+
+    VALUE directives_array = rb_ary_new();
+
+    while (format < format_end) {
+        yp_pack_type type;
+        yp_pack_signed signed_type;
+        yp_pack_endian endian;
+        yp_pack_size size;
+        yp_pack_length_type length_type;
+        uint64_t length;
+
+        const char *directive_start = format;
+
+        yp_pack_result parse_result = yp_pack_parse(variant, &format, format_end, &type, &signed_type, &endian,
+                                                                                                &size, &length_type, &length, &encoding);
+
+        const char *directive_end = format;
+
+        switch (parse_result) {
+            case YP_PACK_OK:
+                break;
+            case YP_PACK_ERROR_UNSUPPORTED_DIRECTIVE:
+                rb_raise(rb_eArgError, "unsupported directive");
+            case YP_PACK_ERROR_UNKNOWN_DIRECTIVE:
+                rb_raise(rb_eArgError, "unsupported directive");
+            case YP_PACK_ERROR_LENGTH_TOO_BIG:
+                rb_raise(rb_eRangeError, "pack length too big");
+            case YP_PACK_ERROR_BANG_NOT_ALLOWED:
+                rb_raise(rb_eRangeError, "bang not allowed");
+            case YP_PACK_ERROR_DOUBLE_ENDIAN:
+                rb_raise(rb_eRangeError, "double endian");
+            default:
+                rb_bug("parse result");
+        }
+
+        if (type == YP_PACK_END) {
+            break;
+        }
+
+        VALUE directive_args[9] = { version_symbol,
+                                                                variant_symbol,
+                                                                rb_usascii_str_new(directive_start, directive_end - directive_start),
+                                                                pack_type_to_symbol(type),
+                                                                pack_signed_to_symbol(signed_type),
+                                                                pack_endian_to_symbol(endian),
+                                                                pack_size_to_symbol(size),
+                                                                pack_length_type_to_symbol(length_type),
+                                                                (long) LONG2NUM(length) };
+
+        rb_ary_push(directives_array, rb_class_new_instance(9, directive_args, rb_cYARPPackDirective));
+    }
+
+    VALUE format_args[2];
+    format_args[0] = directives_array;
+    format_args[1] = pack_encoding_to_ruby(encoding);
+    return rb_class_new_instance(2, format_args, rb_cYARPPackFormat);
+}
+
+void
+Init_yarp_pack(void) {
+    rb_cYARP = rb_define_module("YARP");
+    rb_cYARPPack = rb_define_module_under(rb_cYARP, "Pack");
+    rb_cYARPPackDirective = rb_define_class_under(rb_cYARPPack, "Directive", rb_cObject);
+    rb_cYARPPackFormat = rb_define_class_under(rb_cYARPPack, "Format", rb_cObject);
+    rb_define_singleton_method(rb_cYARPPack, "parse", pack_parse, 3);
+
+    v3_2_0_symbol = ID2SYM(rb_intern("v3_2_0"));
+    pack_symbol = ID2SYM(rb_intern("pack"));
+    unpack_symbol = ID2SYM(rb_intern("unpack"));
+}