#include "textflag.h"

#define RARG0 R0
#define RARG1 R1
#define RARG2 R2
#define FARG R3

// func runtime·domsanread(addr unsafe.Pointer, sz uintptr)
// Called from msanread.
TEXT	runtime·domsanread(SB), NOSPLIT, $0-16
	MOVD	addr+0(FP), RARG0
	MOVD	sz+8(FP), RARG1
	// void __msan_read_go(void *addr, uintptr_t sz);
	MOVD	$__msan_read_go(SB), FARG
	JMP	msancall<>(SB)

// func runtime·msanwrite(addr unsafe.Pointer, sz uintptr)

package p

import "math/big"

// From go.dev/issue/18419
func _(x *big.Float) {
	x.form /* ERROR "x.form undefined (cannot refer to unexported field form)" */ ()
}

// From go.dev/issue/31053
func _() {
	_ = big.Float{form /* ERROR "cannot refer to unexported field form in struct literal of type big.Float" */ : 0}

#include "textflag.h"

#define RARG0 R4
#define RARG1 R5
#define RARG2 R6
#define FARG  R7

// func runtime·domsanread(addr unsafe.Pointer, sz uintptr)
// Called from msanread.
TEXT	runtime·domsanread(SB), NOSPLIT, $0-16
	MOVV	addr+0(FP), RARG0
	MOVV	sz+8(FP), RARG1
	// void __msan_read_go(void *addr, uintptr_t sz);
	MOVV	$__msan_read_go(SB), FARG
	JMP	msancall<>(SB)

// func runtime·msanwrite(addr unsafe.Pointer, sz uintptr)

## What is "Form Data"

The way HTML forms (`<form></form>`) sends the data to the server normally uses a "special" encoding for that data, it's different from JSON.

**FastAPI** will make sure to read that data from the right place instead of JSON.

!!! note "Technical Details"
    Data from forms is normally encoded using the "media type" `application/x-www-form-urlencoded` when it doesn't include files.

`Form`では`Body`（および`Query`や`Path`、`Cookie`）と同じメタデータとバリデーションを宣言することができます。

!!! info "情報"
    `Form`は`Body`を直接継承するクラスです。

!!! tip "豆知識"
    フォームのボディを宣言するには、明示的に`Form`を使用する必要があります。なぜなら、これを使わないと、パラメータはクエリパラメータやボディ（JSON）パラメータとして解釈されるからです。

## 「フォームフィールド」について

HTMLフォーム（`<form></form>`）がサーバにデータを送信する方法は、通常、そのデータに「特別な」エンコーディングを使用していますが、これはJSONとは異なります。

!!! warning "Aviso"
    Você pode declarar vários parâmetros `File` e `Form` em uma *operação de caminho*, mas não é possível declarar campos `Body` para receber como JSON, pois a requisição terá o corpo codificado usando `multipart/form-data` ao invés de `application/json`.

    Isso não é uma limitação do **FastAPI** , é parte do protocolo HTTP.

## Recapitulando

      """
      |--AaB03x
      |Content-Disposition: form-data; name="field with spaces"; filename="filename with spaces.txt"
      |Content-Type: text/plain; charset=utf-8
      |
      |okay
      |--AaB03x
      |Content-Disposition: form-data; name="field with %22"
      |
      |"
      |--AaB03x
      |Content-Disposition: form-data; name="field with %22"
      |
      |%22
      |--AaB03x

class OAuth2PasswordRequestForm:
    """
    This is a dependency class to collect the `username` and `password` as form data
    for an OAuth2 password flow.

    The OAuth2 specification dictates that for a password flow the data should be
    collected using form data (instead of JSON) and that it should have the specific
    fields `username` and `password`.

    @Execute
    public ActionResponse index(final CacheForm form) {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getCacheResponseFields(), getUserBean()).orElse(null);

	}

	z.neg = x.neg != y.neg

	if x.form == finite && y.form == finite {
		// x * y (common case)
		z.umul(x, y)
		return z
	}

	z.acc = Exact
	if x.form == zero && y.form == inf || x.form == inf && y.form == zero {
		// ±0 * ±Inf
		// ±Inf * ±0
		// value of z is undefined but make sure it's valid
		z.form = zero
		z.neg = false