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package azblob
import (
"errors"
"fmt"
"io"
"strconv"
)
// httpRange defines a range of bytes within an HTTP resource, starting at offset and
// ending at offset+count. A zero-value httpRange indicates the entire resource. An httpRange
// which has an offset but na zero value count indicates from the offset to the resource's end.
type httpRange struct {
offset int64
count int64
}
func (r httpRange) pointers() *string {
if r.offset == 0 && r.count == 0 { // Do common case first for performance
return nil // No specified range
}
if r.offset < 0 {
panic("The range offset must be >= 0")
}
if r.count < 0 {
panic("The range count must be >= 0")
}
endOffset := "" // if count == 0
if r.count > 0 {
endOffset = strconv.FormatInt((r.offset+r.count)-1, 10)
}
dataRange := fmt.Sprintf("bytes=%v-%s", r.offset, endOffset)
return &dataRange
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func validateSeekableStreamAt0AndGetCount(body io.ReadSeeker) int64 {
if body == nil { // nil body's are "logically" seekable to 0 and are 0 bytes long
return 0
}
validateSeekableStreamAt0(body)
count, err := body.Seek(0, io.SeekEnd)
if err != nil {
panic("failed to seek stream")
}
body.Seek(0, io.SeekStart)
return count
}
func validateSeekableStreamAt0(body io.ReadSeeker) {
if body == nil { // nil body's are "logically" seekable to 0
return
}
if pos, err := body.Seek(0, io.SeekCurrent); pos != 0 || err != nil {
if err != nil {
panic(err)
}
panic(errors.New("stream must be set to position 0"))
}
}
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