48 lines
1.7 KiB
C#
48 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace XPrint.Image
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{
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public class PSDModifier
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{
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private const int HeaderSize = 26;
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private const int ChannelInfoOffset = 128; // 通道信息起始偏移量（需根据实际文件调整）
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public static void RenameChannel(string filePath, string oldName, string newName)
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{
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byte[] fileData = File.ReadAllBytes(filePath);
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// 1. 验证 PSD 文件头
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if (Encoding.ASCII.GetString(fileData, 0, 4) != "8BPS")
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throw new InvalidDataException("非有效 PSD 文件");
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// 2. 定位通道信息块
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int channelCount = fileData[12]; // 第 13 字节为通道数
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int infoOffset = BitConverter.ToInt32(fileData, HeaderSize + 4); // 通道信息块偏移量
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// 3. 遍历通道信息
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for (int i = 0; i < channelCount; i++)
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{
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int channelOffset = infoOffset + i * 12;
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string channelName = Encoding.ASCII.GetString(fileData, channelOffset + 4, 24).TrimEnd('\0');
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if (channelName.Equals(oldName, StringComparison.OrdinalIgnoreCase))
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{
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// 4. 修改通道名称（需填充为 24 字节）
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byte[] newNameBytes = Encoding.ASCII.GetBytes(newName.PadRight(24));
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Array.Copy(newNameBytes, 0, fileData, channelOffset + 4, newNameBytes.Length);
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// 5. 写回文件
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File.WriteAllBytes(filePath, fileData);
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return;
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}
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}
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throw new KeyNotFoundException("未找到指定通道");
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}
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}
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}
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