mirror of
https://github.com/go-gitea/gitea
synced 2024-12-25 10:04:27 +00:00
b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
243 lines
5.9 KiB
Go
243 lines
5.9 KiB
Go
// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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// All non-std package dependencies live in this file,
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// so porting to different environment is easy (just update functions).
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import (
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"errors"
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"fmt"
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"math"
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"reflect"
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)
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func panicValToErr(panicVal interface{}, err *error) {
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if panicVal == nil {
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return
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}
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// case nil
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switch xerr := panicVal.(type) {
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case error:
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*err = xerr
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case string:
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*err = errors.New(xerr)
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default:
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*err = fmt.Errorf("%v", panicVal)
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}
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return
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}
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func hIsEmptyValue(v reflect.Value, deref, checkStruct bool) bool {
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switch v.Kind() {
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case reflect.Invalid:
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return true
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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if deref {
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if v.IsNil() {
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return true
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}
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return hIsEmptyValue(v.Elem(), deref, checkStruct)
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} else {
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return v.IsNil()
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}
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case reflect.Struct:
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if !checkStruct {
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return false
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}
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// return true if all fields are empty. else return false.
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// we cannot use equality check, because some fields may be maps/slices/etc
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// and consequently the structs are not comparable.
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// return v.Interface() == reflect.Zero(v.Type()).Interface()
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for i, n := 0, v.NumField(); i < n; i++ {
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if !hIsEmptyValue(v.Field(i), deref, checkStruct) {
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return false
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}
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}
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return true
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}
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return false
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}
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func isEmptyValue(v reflect.Value) bool {
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return hIsEmptyValue(v, derefForIsEmptyValue, checkStructForEmptyValue)
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}
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func pruneSignExt(v []byte, pos bool) (n int) {
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if len(v) < 2 {
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} else if pos && v[0] == 0 {
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for ; v[n] == 0 && n+1 < len(v) && (v[n+1]&(1<<7) == 0); n++ {
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}
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} else if !pos && v[0] == 0xff {
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for ; v[n] == 0xff && n+1 < len(v) && (v[n+1]&(1<<7) != 0); n++ {
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}
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}
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return
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}
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func implementsIntf(typ, iTyp reflect.Type) (success bool, indir int8) {
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if typ == nil {
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return
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}
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rt := typ
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// The type might be a pointer and we need to keep
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// dereferencing to the base type until we find an implementation.
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for {
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if rt.Implements(iTyp) {
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return true, indir
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}
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if p := rt; p.Kind() == reflect.Ptr {
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indir++
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if indir >= math.MaxInt8 { // insane number of indirections
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return false, 0
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}
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rt = p.Elem()
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continue
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}
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break
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}
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// No luck yet, but if this is a base type (non-pointer), the pointer might satisfy.
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if typ.Kind() != reflect.Ptr {
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// Not a pointer, but does the pointer work?
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if reflect.PtrTo(typ).Implements(iTyp) {
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return true, -1
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}
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}
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return false, 0
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}
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// validate that this function is correct ...
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// culled from OGRE (Object-Oriented Graphics Rendering Engine)
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// function: halfToFloatI (http://stderr.org/doc/ogre-doc/api/OgreBitwise_8h-source.html)
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func halfFloatToFloatBits(yy uint16) (d uint32) {
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y := uint32(yy)
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s := (y >> 15) & 0x01
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e := (y >> 10) & 0x1f
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m := y & 0x03ff
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if e == 0 {
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if m == 0 { // plu or minus 0
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return s << 31
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} else { // Denormalized number -- renormalize it
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for (m & 0x00000400) == 0 {
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m <<= 1
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e -= 1
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}
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e += 1
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const zz uint32 = 0x0400
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m &= ^zz
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}
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} else if e == 31 {
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if m == 0 { // Inf
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return (s << 31) | 0x7f800000
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} else { // NaN
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return (s << 31) | 0x7f800000 | (m << 13)
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}
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}
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e = e + (127 - 15)
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m = m << 13
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return (s << 31) | (e << 23) | m
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}
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// GrowCap will return a new capacity for a slice, given the following:
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// - oldCap: current capacity
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// - unit: in-memory size of an element
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// - num: number of elements to add
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func growCap(oldCap, unit, num int) (newCap int) {
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// appendslice logic (if cap < 1024, *2, else *1.25):
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// leads to many copy calls, especially when copying bytes.
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// bytes.Buffer model (2*cap + n): much better for bytes.
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// smarter way is to take the byte-size of the appended element(type) into account
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// maintain 3 thresholds:
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// t1: if cap <= t1, newcap = 2x
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// t2: if cap <= t2, newcap = 1.75x
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// t3: if cap <= t3, newcap = 1.5x
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// else newcap = 1.25x
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//
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// t1, t2, t3 >= 1024 always.
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// i.e. if unit size >= 16, then always do 2x or 1.25x (ie t1, t2, t3 are all same)
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//
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// With this, appending for bytes increase by:
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// 100% up to 4K
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// 75% up to 8K
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// 50% up to 16K
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// 25% beyond that
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// unit can be 0 e.g. for struct{}{}; handle that appropriately
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var t1, t2, t3 int // thresholds
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if unit <= 1 {
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t1, t2, t3 = 4*1024, 8*1024, 16*1024
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} else if unit < 16 {
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t3 = 16 / unit * 1024
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t1 = t3 * 1 / 4
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t2 = t3 * 2 / 4
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} else {
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t1, t2, t3 = 1024, 1024, 1024
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}
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var x int // temporary variable
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// x is multiplier here: one of 5, 6, 7 or 8; incr of 25%, 50%, 75% or 100% respectively
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if oldCap <= t1 { // [0,t1]
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x = 8
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} else if oldCap > t3 { // (t3,infinity]
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x = 5
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} else if oldCap <= t2 { // (t1,t2]
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x = 7
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} else { // (t2,t3]
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x = 6
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}
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newCap = x * oldCap / 4
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if num > 0 {
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newCap += num
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}
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// ensure newCap is a multiple of 64 (if it is > 64) or 16.
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if newCap > 64 {
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if x = newCap % 64; x != 0 {
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x = newCap / 64
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newCap = 64 * (x + 1)
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}
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} else {
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if x = newCap % 16; x != 0 {
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x = newCap / 16
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newCap = 16 * (x + 1)
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}
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}
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return
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}
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func expandSliceValue(s reflect.Value, num int) reflect.Value {
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if num <= 0 {
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return s
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}
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l0 := s.Len()
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l1 := l0 + num // new slice length
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if l1 < l0 {
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panic("ExpandSlice: slice overflow")
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}
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c0 := s.Cap()
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if l1 <= c0 {
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return s.Slice(0, l1)
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}
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st := s.Type()
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c1 := growCap(c0, int(st.Elem().Size()), num)
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s2 := reflect.MakeSlice(st, l1, c1)
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// println("expandslicevalue: cap-old: ", c0, ", cap-new: ", c1, ", len-new: ", l1)
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reflect.Copy(s2, s)
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return s2
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}
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