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[Constants] Make file headers constants

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This commit is contained in:
Matt Nadareski
2016-08-29 11:52:11 -07:00
parent 77ef7a4ccc
commit 9d8c012317
2 changed files with 97 additions and 38 deletions
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32
SabreTools.Helper/Tools/ArchiveTools.cs
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@@ -558,28 +558,6 @@ namespace SabreTools.Helper
return roms;
}
/* (Torrent)GZ Header Format
(https://tools.ietf.org/html/rfc1952)
00 Identification 1 (0x1F)
01 Identification 2 (0x8B)
02 Compression Method (0-7 reserved, 8 deflate; 0x08)
03 Flags (0 FTEXT, 1 FHCRC, 2 FEXTRA, 3 FNAME, 4 FCOMMENT, 5 reserved, 6 reserved, 7 reserved; 0x04)
04-07 Modification time (Unix format; 0x00, 0x00, 0x00, 0x00)
08 Extra Flags (2 maximum compression, 4 fastest algorithm; 0x00)
09 OS (See list on https://tools.ietf.org/html/rfc1952; 0x00)
0A-0B [if FEXTRA set] Length of extra field (mirrored; 0x1C, 0x00)
0C-ww [if FEXTRA set] Extra field
0C-1B MD5 Hash
1C-1F CRC hash
20-27 Int64 size (mirrored)
ww+1-xx [if FNAME set] Original filename, 00 terminated
xx+1-yy [if FCOMMENT set] File comment, 00 terminated
yy+1-yy+03 [if FHCRC set] CRC16
yy+04-zz Compressed blocks
zz+1-zz+5 CRC32
zz+6-zz+10 Size (< 4GiB, mirrored)
*/
/// <summary>
/// Retrieve file information for a single torrent GZ file
/// </summary>
@@ -607,7 +585,6 @@ namespace SabreTools.Helper
// Get the Romba-specific header data
byte[] header; // Get preamble header for checking
byte[] headercheck = new byte[] { 0x1f, 0x8b, 0x8, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1c, 0x0 };
byte[] headermd5; // MD5
byte[] headercrc; // CRC
byte[] headersz; // Int64 size
@@ -623,7 +600,7 @@ namespace SabreTools.Helper
bool correct = true;
for (int i = 0; i < header.Length; i++)
{
correct &= (header[i] == headercheck[i]);
correct &= (header[i] == Constants.TorrentGZHeader[i]);
}
if (!correct)
{
@@ -691,11 +668,8 @@ namespace SabreTools.Helper
{
using (BinaryReader br = new BinaryReader(File.OpenRead(outfile)))
{
// Copy the first part of the file to the memory stream
sw.Write(br.ReadBytes(3)); //0x1F (ID1), 0x8B (ID2), 0x08 (Compression method - Deflate)
// Now write TGZ info
byte[] data = new byte[] { 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1c, 0x0 } // Flags with FEXTRA set (1), MTIME (4), XFLAG (1), OS (1), FEXTRA-LEN (2, Mirrored)
// Write standard header and TGZ info
byte[] data = Constants.TorrentGZHeader
.Concat(StringToByteArray(rom.MD5)) // MD5
.Concat(StringToByteArray(rom.CRC)) // CRC
.Concat(BitConverter.GetBytes(rom.Size).Reverse().ToArray()) // Long size (Mirrored)