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using System;
using System.IO;
using System.Buffers;
using System.Collections.Generic;
using System.Security.Cryptography;
namespace Mono.Debugging.Client
{
[Serializable]
public class SourceLocation
{
public string MethodName { get; private set; }
public string FileName { get; private set; }
public int Line { get; private set; }
public int Column { get; private set; }
public int EndLine { get; private set; }
public int EndColumn { get; private set; }
public byte[] FileHash { get; private set; }
public SourceLink SourceLink { get; private set; }
[Obsolete]
public SourceLocation (string methodName, string fileName, int line)
: this (methodName, fileName, line, -1, -1, -1, null)
{
}
public SourceLocation (string methodName, string fileName, int line, int column, int endLine, int endColumn)
: this (methodName, fileName, line, column, endLine, endColumn, null, null)
{
}
public SourceLocation (string methodName, string fileName, int line, int column, int endLine, int endColumn, byte [] hash = null)
: this (methodName, fileName, line, column, endLine, endColumn, hash, null)
{
}
public SourceLocation (string methodName, string fileName, int line, int column, int endLine, int endColumn, byte[] hash = null, SourceLink sourceLink = null)
{
this.MethodName = methodName;
this.FileName = fileName;
this.Line = line;
this.Column = column;
this.EndLine = endLine;
this.EndColumn = endColumn;
this.FileHash = hash;
this.SourceLink = sourceLink;
}
public override string ToString ()
{
return string.Format("[SourceLocation Method={0}, Filename={1}, Line={2}, Column={3}]", MethodName, FileName, Line, Column);
}
static void ComputeHashes (Stream stream, HashAlgorithm hash, HashAlgorithm dos, HashAlgorithm unix)
{
var unixBuffer = ArrayPool<byte>.Shared.Rent (4096 + 1);
var dosBuffer = ArrayPool<byte>.Shared.Rent (8192 + 1);
var buffer = ArrayPool<byte>.Shared.Rent (4096);
byte pc = 0;
int count;
try {
while ((count = stream.Read (buffer, 0, buffer.Length)) > 0) {
int unixIndex = 0, dosIndex = 0;
for (int i = 0; i < count; i++) {
var c = buffer[i];
if (c == (byte) '\r') {
if (pc == (byte) '\r')
unixBuffer[unixIndex++] = pc;
dosBuffer[dosIndex++] = c;
} else if (c == (byte) '\n') {
if (pc != (byte) '\r')
dosBuffer[dosIndex++] = (byte) '\r';
unixBuffer[unixIndex++] = c;
dosBuffer[dosIndex++] = c;
} else {
if (pc == (byte) '\r')
unixBuffer[unixIndex++] = pc;
unixBuffer[unixIndex++] = c;
dosBuffer[dosIndex++] = c;
}
pc = c;
}
hash.TransformBlock (buffer, 0, count, outputBuffer: null, outputOffset: 0);
dos.TransformBlock (dosBuffer, 0, dosIndex, outputBuffer: null, outputOffset: 0);
unix.TransformBlock (unixBuffer, 0, unixIndex, outputBuffer: null, outputOffset: 0);
}
hash.TransformFinalBlock (buffer, 0, 0);
dos.TransformFinalBlock (buffer, 0, 0);
unix.TransformFinalBlock (buffer, 0, 0);
} finally {
ArrayPool<byte>.Shared.Return (unixBuffer);
ArrayPool<byte>.Shared.Return (dosBuffer);
ArrayPool<byte>.Shared.Return (buffer);
}
}
public static List<byte[]> ComputeChecksums (string path, string algorithm)
{
using (var stream = File.OpenRead (path)) {
using (var hash = HashAlgorithm.Create (algorithm)) {
using (var dos = HashAlgorithm.Create (algorithm)) {
using (var unix = HashAlgorithm.Create (algorithm)) {
ComputeHashes (stream, hash, dos, unix);
var checksums = new List<byte[]> (3);
checksums.Add (hash.Hash);
checksums.Add (dos.Hash);
checksums.Add (unix.Hash);
return checksums;
}
}
}
}
}
static bool ChecksumsEqual (byte[] calculated, byte[] checksum, int skip = 0)
{
if (skip > 0) {
if (calculated.Length < checksum.Length - skip)
return false;
} else {
if (calculated.Length != checksum.Length)
return false;
}
for (int i = 0, csi = skip; csi < checksum.Length; i++, csi++) {
if (calculated[i] != checksum[csi])
return false;
}
return true;
}
static bool CheckHash (Stream stream, string algorithm, byte[] checksum)
{
using (var hash = HashAlgorithm.Create (algorithm)) {
int size = hash.HashSize / 8;
using (var dos = HashAlgorithm.Create (algorithm)) {
using (var unix = HashAlgorithm.Create (algorithm)) {
stream.Position = 0;
ComputeHashes (stream, hash, dos, unix);
if (checksum [0] == size && checksum.Length < size) {
return ChecksumsEqual (hash.Hash, checksum, 1) ||
ChecksumsEqual (unix.Hash, checksum, 1) ||
ChecksumsEqual (dos.Hash, checksum, 1);
}
return ChecksumsEqual (hash.Hash, checksum) ||
ChecksumsEqual (unix.Hash, checksum) ||
ChecksumsEqual (dos.Hash, checksum);
}
}
}
}
public static bool CheckFileHash (string path, byte[] checksum)
{
if (checksum == null || checksum.Length == 0 || !File.Exists (path))
return false;
using (var stream = File.OpenRead (path)) {
if (checksum.Length == 16) {
// Note: Roslyn SHA1 hashes are 16 bytes and start w/ 20
if (checksum[0] == 20 && CheckHash (stream, "SHA1", checksum))
return true;
// Note: Roslyn SHA256 hashes are 16 bytes and start w/ 32
if (checksum[0] == 32 && CheckHash (stream, "SHA256", checksum))
return true;
return CheckHash (stream, "MD5", checksum);
}
if (checksum.Length == 20)
return CheckHash (stream, "SHA1", checksum);
if (checksum.Length == 32)
return CheckHash (stream, "SHA256", checksum);
}
return false;
}
}
}
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