mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
142 lines
3.5 KiB
Go
142 lines
3.5 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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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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package ofdgo
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import (
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"fmt"
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"math"
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"unicode/utf8"
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)
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// u3dResourceReader 读取骨骼权重与动作资源中交错的普通字段和压缩字段
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type u3dResourceReader struct {
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values *u3dValues
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decoder *u3dDecoder
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bits *u3dBits
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hist [8]u3dHistogram
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charged uint64
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}
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// value 读取指定上下文的压缩字段，首次使用时初始化算术区间
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// 入参: context 压缩上下文, small 是否为8位字段
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// 返回: uint32 字段值
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func (r *u3dResourceReader) value(context int, small bool) uint32 {
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if r.err() != nil {
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return 0
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}
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if r.decoder.plain {
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if small {
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return uint32(r.values.u8())
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}
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return r.values.u32()
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}
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if r.bits == nil {
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r.bits = newU3DBits(r.values.data[r.values.pos:])
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r.bits.reserve = func(count, size uint64) error {
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if err := r.decoder.reserve(count, size); err != nil {
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return err
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}
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r.charged += count * size
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return nil
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}
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}
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return r.bits.dynamicValue(&r.hist[context], small)
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}
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// u32 读取普通32位字段，压缩开始后沿用当前算术区间
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// 返回: uint32 字段值
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func (r *u3dResourceReader) u32() uint32 {
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if r.bits != nil {
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return r.bits.u32()
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}
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return r.values.u32()
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}
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// f32 读取有限单精度数值
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// 返回: float32 字段值
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func (r *u3dResourceReader) f32() float32 {
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value := math.Float32frombits(r.u32())
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if !finite(float64(value)) && r.err() == nil {
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r.values.err = fmt.Errorf("invalid U3D floating-point value")
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}
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return value
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}
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// text 读取UTF-8名称，压缩开始后逐字节解码而不重置区间
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// 返回: string 名称
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func (r *u3dResourceReader) text() string {
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if r.err() != nil {
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return ""
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}
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if r.bits == nil {
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return r.values.text()
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}
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length := int(r.bits.byteValue()) | int(r.bits.byteValue())<<8
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if r.err() != nil {
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return ""
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}
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if err := r.decoder.reserve(uint64(length), 2); err != nil {
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r.values.err = err
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return ""
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}
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data := make([]byte, length)
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for index := range data {
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if index%1024 == 0 {
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if err := r.decoder.ctx.Err(); err != nil {
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r.values.err = err
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return ""
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}
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}
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data[index] = r.bits.byteValue()
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}
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if r.err() == nil && !utf8.Valid(data) {
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r.values.err = fmt.Errorf("invalid U3D UTF-8 string")
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}
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return string(data)
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}
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// err 返回字段或算术解码错误
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// 返回: error 读取错误
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func (r *u3dResourceReader) err() error {
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if r.values.err != nil {
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return r.values.err
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}
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if r.bits != nil {
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return r.bits.err
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}
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return nil
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}
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// done 校验末尾冲刷字段和块边界
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// 返回: error 读取或多余数据错误
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func (r *u3dResourceReader) done() error {
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if err := r.err(); err != nil {
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return err
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}
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if r.bits != nil {
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if err := r.bits.finish(); err != nil {
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return err
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}
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r.values.pos = len(r.values.data)
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}
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return r.values.done()
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}
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// release 归还当前块压缩上下文占用的临时预算
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func (r *u3dResourceReader) release() {
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r.decoder.remaining += r.charged
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r.charged = 0
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}
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