108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rand
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import (
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"io"
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c "github.com/goplus/llgo/runtime/internal/clite"
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"github.com/goplus/llgo/runtime/internal/clite/openssl"
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"github.com/qiniu/x/errors"
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)
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// llgo:skipall
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type _rand struct{}
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type rndReader struct{}
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func (rndReader) Read(p []byte) (n int, err error) {
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return Read(p)
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}
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// Reader is a global, shared instance of a cryptographically
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// secure random number generator.
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var Reader io.Reader = rndReader{}
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type opensslError struct {
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file *c.Char
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line c.Int
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flags c.Int
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function *c.Char
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data *c.Char
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err openssl.Errno
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}
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// [error code]:[library name]:[function name]:[reason string]:[[filename:line]]: [text message]
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func (p *opensslError) Error() string {
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const bufsize = 1024
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buf := (*c.Char)(c.Alloca(bufsize))
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lib := openssl.ERRLibErrorString(p.err)
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reason := openssl.ERRReasonErrorString(p.err)
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n := uintptr(c.Snprintf(
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buf, bufsize,
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c.Str("%d:%s:%s:%s:[%s:%d]: "),
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p.err, lib, p.function, reason, p.file, p.line))
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n += c.Strlen(openssl.ERRErrorString(p.err, c.Advance(buf, n)))
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return c.GoString(buf, n)
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}
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func getError() *opensslError {
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ret := new(opensslError)
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err := openssl.ERRGetErrorAll(&ret.file, &ret.line, &ret.function, &ret.data, &ret.flags)
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if err == 0 {
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return nil
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}
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return ret
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}
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func getErrors() error {
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var errs errors.List
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for openssl.ERRPeekError() != 0 {
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errs.Add(getError())
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}
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return errs.ToError()
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}
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// Read is a helper function that calls Reader.Read using io.ReadFull.
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// On return, n == len(b) if and only if err == nil.
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func Read(b []byte) (n int, err error) {
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if openssl.RANDBytes(b) != 0 {
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return len(b), nil
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}
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return 0, getErrors()
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}
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/* TODO(xsw):
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// batched returns a function that calls f to populate a []byte by chunking it
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// into subslices of, at most, readMax bytes.
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func batched(f func([]byte) error, readMax int) func([]byte) error {
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return func(out []byte) error {
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for len(out) > 0 {
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read := len(out)
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if read > readMax {
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read = readMax
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}
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if err := f(out[:read]); err != nil {
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return err
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}
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out = out[read:]
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}
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return nil
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}
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}
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*/
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