mirror of
https://github.com/matrix-org/dendrite.git
synced 2025-12-17 03:43:11 -06:00
ab81b95eae
Previously, all events would come down redacted because the hash checks would fail. They would fail because sjson.DeleteBytes didn't remove keys not used for hashing. This didn't work because of a build tag which included a file which no-oped the index returned. See https://github.com/tidwall/gjson/issues/157 When it's resolved, let's go back to mainline.
82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
//+build !appengine
|
|
//+build !js
|
|
|
|
package gjson
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
// getBytes casts the input json bytes to a string and safely returns the
|
|
// results as uniquely allocated data. This operation is intended to minimize
|
|
// copies and allocations for the large json string->[]byte.
|
|
func getBytes(json []byte, path string) Result {
|
|
var result Result
|
|
if json != nil {
|
|
// unsafe cast to string
|
|
result = Get(*(*string)(unsafe.Pointer(&json)), path)
|
|
// safely get the string headers
|
|
rawhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Raw))
|
|
strhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Str))
|
|
// create byte slice headers
|
|
rawh := reflect.SliceHeader{Data: rawhi.Data, Len: rawhi.Len}
|
|
strh := reflect.SliceHeader{Data: strhi.Data, Len: strhi.Len}
|
|
if strh.Data == 0 {
|
|
// str is nil
|
|
if rawh.Data == 0 {
|
|
// raw is nil
|
|
result.Raw = ""
|
|
} else {
|
|
// raw has data, safely copy the slice header to a string
|
|
result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
|
|
}
|
|
result.Str = ""
|
|
} else if rawh.Data == 0 {
|
|
// raw is nil
|
|
result.Raw = ""
|
|
// str has data, safely copy the slice header to a string
|
|
result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
|
|
} else if strh.Data >= rawh.Data &&
|
|
int(strh.Data)+strh.Len <= int(rawh.Data)+rawh.Len {
|
|
// Str is a substring of Raw.
|
|
start := int(strh.Data - rawh.Data)
|
|
// safely copy the raw slice header
|
|
result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
|
|
// substring the raw
|
|
result.Str = result.Raw[start : start+strh.Len]
|
|
} else {
|
|
// safely copy both the raw and str slice headers to strings
|
|
result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
|
|
result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
// fillIndex finds the position of Raw data and assigns it to the Index field
|
|
// of the resulting value. If the position cannot be found then Index zero is
|
|
// used instead.
|
|
func fillIndex(json string, c *parseContext) {
|
|
if len(c.value.Raw) > 0 && !c.calcd {
|
|
jhdr := *(*reflect.StringHeader)(unsafe.Pointer(&json))
|
|
rhdr := *(*reflect.StringHeader)(unsafe.Pointer(&(c.value.Raw)))
|
|
c.value.Index = int(rhdr.Data - jhdr.Data)
|
|
if c.value.Index < 0 || c.value.Index >= len(json) {
|
|
c.value.Index = 0
|
|
}
|
|
}
|
|
}
|
|
|
|
func stringBytes(s string) []byte {
|
|
return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
|
|
Data: (*reflect.StringHeader)(unsafe.Pointer(&s)).Data,
|
|
Len: len(s),
|
|
Cap: len(s),
|
|
}))
|
|
}
|
|
|
|
func bytesString(b []byte) string {
|
|
return *(*string)(unsafe.Pointer(&b))
|
|
}
|