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142 lines
3.1 KiB
Go
142 lines
3.1 KiB
Go
package mget
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import (
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"b612.me/staros"
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"context"
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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"regexp"
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"runtime"
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"sync/atomic"
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"time"
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)
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func parseContentRange(contentRange string) (start, end, total int64, err error) {
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_, err = fmt.Sscanf(contentRange, "bytes %d-%d/%d", &start, &end, &total)
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return
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}
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func GetFileName(resp *http.Response) string {
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fname := getFileName(resp)
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var idx = 0
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for {
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idx++
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if staros.Exists(fname) {
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if staros.Exists(fname + ".bgrd") {
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return fname
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}
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fname = fmt.Sprintf("%s.%d", fname, idx)
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} else {
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break
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}
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}
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return fname
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}
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func getFileName(resp *http.Response) string {
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// 尝试从Content-Disposition头中提取文件名
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contentDisposition := resp.Header.Get("Content-Disposition")
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if contentDisposition != "" {
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// 使用正则表达式提取文件名
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re := regexp.MustCompile(`(?i)^attachment; filename="?(?P<filename>[^;"]+)`)
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matches := re.FindStringSubmatch(contentDisposition)
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if len(matches) > 1 {
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// 提取命名的捕获组
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for i, name := range re.SubexpNames() {
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if name == "filename" {
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return matches[i]
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}
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}
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}
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}
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// 提取路径中的最后一个元素作为文件名
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return path.Base(resp.Request.URL.Path)
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}
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func IOWriter(stopCtx context.Context, ch chan Buffer, state *uint32, di *downloadinfo, reader io.ReadCloser, bufSize int, start *int64, end *int64) error {
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defer reader.Close()
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for {
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buf := make([]byte, bufSize)
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select {
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case <-stopCtx.Done():
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return nil
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default:
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if atomic.LoadUint32(state) == 1 {
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runtime.Gosched()
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time.Sleep(time.Millisecond)
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continue
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}
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n, err := reader.Read(buf)
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if n > 0 {
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ch <- Buffer{Data: buf[:n], Start: uint64(*start)}
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*start += int64(n)
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di.AddCurrent(int64(n))
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}
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if *end != 0 && *start >= *end {
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return nil
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}
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if err != nil {
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if err == io.EOF {
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return nil
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}
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return err
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}
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}
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}
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}
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func createFileWithSize(filename string, size int64) (*os.File, error) {
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file, err := os.Create(filename)
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if err != nil {
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return nil, err
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}
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if size == 0 {
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return file, nil
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}
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// 调整文件指针到指定大小位置
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if _, err = file.Seek(size-1, 0); err != nil {
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return nil, err
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}
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// 写入一个空字节，以确保文件达到所需大小
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if _, err = file.Write([]byte{0}); err != nil {
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return nil, err
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}
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return file, nil
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}
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func CloneHeader(original http.Header) http.Header {
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newHeader := make(http.Header)
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for key, values := range original {
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copiedValues := make([]string, len(values))
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copy(copiedValues, values)
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newHeader[key] = copiedValues
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}
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return newHeader
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}
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func CloneCookies(original []*http.Cookie) []*http.Cookie {
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cloned := make([]*http.Cookie, len(original))
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for i, cookie := range original {
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cloned[i] = &http.Cookie{
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Name: cookie.Name,
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Value: cookie.Value,
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Path: cookie.Path,
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Domain: cookie.Domain,
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Expires: cookie.Expires,
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RawExpires: cookie.RawExpires,
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MaxAge: cookie.MaxAge,
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Secure: cookie.Secure,
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HttpOnly: cookie.HttpOnly,
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SameSite: cookie.SameSite,
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Raw: cookie.Raw,
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Unparsed: append([]string(nil), cookie.Unparsed...),
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}
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}
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return cloned
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}
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