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(EriFile): new wrapper class for Entis files reading.

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This commit is contained in:
morkt 2015-05-29 14:57:21 +04:00
parent 29b41fc8ee
commit 74e8d13846
1 changed files with 45 additions and 20 deletions
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65
ArcFormats/ImageERI.cs
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@ -78,6 +78,45 @@ namespace GameRes.Formats.Entis
SideBySide = 0x10000000,
}
internal class EriFile : BinaryReader
{
internal struct Section
{
public AsciiString Id;
public long Length;
}
public EriFile (Stream stream) : base (stream, System.Text.Encoding.ASCII, true)
{
}
public Section ReadSection ()
{
var section = new Section();
section.Id = new AsciiString (8);
if (8 != this.Read (section.Id.Value, 0, 8))
throw new EndOfStreamException();
section.Length = this.ReadInt64();
return section;
}
public long FindSection (string name)
{
var id = new AsciiString (8);
for (;;)
{
if (8 != this.Read (id.Value, 0, 8))
throw new EndOfStreamException();
var length = this.ReadInt64();
if (length < 0)
throw new EndOfStreamException();
if (id == name)
return length;
this.BaseStream.Seek (length, SeekOrigin.Current);
}
}
}
[Export(typeof(ImageFormat))]
public class EriFormat : ImageFormat
{
@ -94,9 +133,9 @@ namespace GameRes.Formats.Entis
return null;
if (!Binary.AsciiEqual (header, 0x10, "Entis Rasterized Image"))
return null;
using (var reader = new ArcView.Reader (stream))
using (var reader = new EriFile (stream))
{
var section = ReadEriSection (reader);
var section = reader.ReadSection();
if (section.Id != "Header " || section.Length <= 0)
return null;
int header_size = (int)section.Length;
@ -104,7 +143,7 @@ namespace GameRes.Formats.Entis
EriMetaData info = null;
while (header_size > 8)
{
section = ReadEriSection (reader);
section = reader.ReadSection();
header_size -= 8;
if (section.Length <= 0 || section.Length > header_size)
break;
@ -146,12 +185,12 @@ namespace GameRes.Formats.Entis
if (null == meta)
throw new ArgumentException ("EriFormat.Read should be supplied with EriMetaData", "info");
stream.Position = meta.StreamPos;
using (var input = new ArcView.Reader (stream))
using (var input = new EriFile (stream))
{
Color[] palette = null;
for (;;) // ReadEriSection throws an exception in case of EOF
for (;;) // ReadSection throws an exception in case of EOF
{
var section = ReadEriSection (input);
var section = input.ReadSection();
if ("Stream " == section.Id)
continue;
if ("ImageFrm" == section.Id)
@ -192,20 +231,6 @@ namespace GameRes.Formats.Entis
{
throw new NotImplementedException ("EriFormat.Write not implemented");
}
internal struct Section
{
public string Id;
public long Length;
}
static internal Section ReadEriSection (BinaryReader reader)
{
var section = new Section();
section.Id = new string (reader.ReadChars (8));
section.Length = reader.ReadInt64();
return section;
}
}
/*****************************************************************************