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//-----------------------------------------------------------------------------
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the Microsoft Public License.
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//-----------------------------------------------------------------------------
using System;
using System.IO;
using System.Text;
namespace Microsoft.Cci.Pdb {
internal class BitAccess {
internal BitAccess(int capacity) {
this.buffer = new byte[capacity];
}
internal byte[] Buffer {
get { return buffer; }
}
private byte[] buffer;
internal void FillBuffer(Stream stream, int capacity) {
MinCapacity(capacity);
stream.Read(buffer, 0, capacity);
offset = 0;
}
internal void Append(Stream stream, int count) {
int newCapacity = offset + count;
if (buffer.Length < newCapacity) {
byte[] newBuffer = new byte[newCapacity];
Array.Copy(buffer, newBuffer, buffer.Length);
buffer = newBuffer;
}
stream.Read(buffer, offset, count);
offset += count;
}
internal int Position {
get { return offset; }
set { offset = value; }
}
private int offset;
//internal void WriteBuffer(Stream stream, int count) {
// stream.Write(buffer, 0, count);
//}
internal void MinCapacity(int capacity) {
if (buffer.Length < capacity) {
buffer = new byte[capacity];
}
offset = 0;
}
internal void Align(int alignment) {
while ((offset % alignment) != 0) {
offset++;
}
}
//internal void WriteInt32(int value) {
// buffer[offset + 0] = (byte)value;
// buffer[offset + 1] = (byte)(value >> 8);
// buffer[offset + 2] = (byte)(value >> 16);
// buffer[offset + 3] = (byte)(value >> 24);
// offset += 4;
//}
//internal void WriteInt32(int[] values) {
// for (int i = 0; i < values.Length; i++) {
// WriteInt32(values[i]);
// }
//}
//internal void WriteBytes(byte[] bytes) {
// for (int i = 0; i < bytes.Length; i++) {
// buffer[offset++] = bytes[i];
// }
//}
internal void ReadInt16(out short value) {
value = (short)((buffer[offset + 0] & 0xFF) |
(buffer[offset + 1] << 8));
offset += 2;
}
internal void ReadInt8(out sbyte value) {
value = (sbyte)buffer[offset];
offset += 1;
}
internal void ReadInt32(out int value) {
value = (int)((buffer[offset + 0] & 0xFF) |
(buffer[offset + 1] << 8) |
(buffer[offset + 2] << 16) |
(buffer[offset + 3] << 24));
offset += 4;
}
internal void ReadInt64(out long value) {
value = (long)(((ulong)buffer[offset + 0] & 0xFF) |
((ulong)buffer[offset + 1] << 8) |
((ulong)buffer[offset + 2] << 16) |
((ulong)buffer[offset + 3] << 24) |
((ulong)buffer[offset + 4] << 32) |
((ulong)buffer[offset + 5] << 40) |
((ulong)buffer[offset + 6] << 48) |
((ulong)buffer[offset + 7] << 56));
offset += 8;
}
internal void ReadUInt16(out ushort value) {
value = (ushort)((buffer[offset + 0] & 0xFF) |
(buffer[offset + 1] << 8));
offset += 2;
}
internal void ReadUInt8(out byte value) {
value = (byte)((buffer[offset + 0] & 0xFF));
offset += 1;
}
internal void ReadUInt32(out uint value) {
value = (uint)((buffer[offset + 0] & 0xFF) |
(buffer[offset + 1] << 8) |
(buffer[offset + 2] << 16) |
(buffer[offset + 3] << 24));
offset += 4;
}
internal void ReadUInt64(out ulong value) {
value = (ulong)(((ulong)buffer[offset + 0] & 0xFF) |
((ulong)buffer[offset + 1] << 8) |
((ulong)buffer[offset + 2] << 16) |
((ulong)buffer[offset + 3] << 24) |
((ulong)buffer[offset + 4] << 32) |
((ulong)buffer[offset + 5] << 40) |
((ulong)buffer[offset + 6] << 48) |
((ulong)buffer[offset + 7] << 56));
offset += 8;
}
internal void ReadInt32(int[] values) {
for (int i = 0; i < values.Length; i++) {
ReadInt32(out values[i]);
}
}
internal void ReadUInt32(uint[] values) {
for (int i = 0; i < values.Length; i++) {
ReadUInt32(out values[i]);
}
}
internal void ReadBytes(byte[] bytes) {
for (int i = 0; i < bytes.Length; i++) {
bytes[i] = buffer[offset++];
}
}
internal float ReadFloat() {
float result = BitConverter.ToSingle(buffer, offset);
offset += 4;
return result;
}
internal double ReadDouble() {
double result = BitConverter.ToDouble(buffer, offset);
offset += 8;
return result;
}
internal decimal ReadDecimal() {
int[] bits = new int[4];
this.ReadInt32(bits);
return new decimal(bits[2], bits[3], bits[1], bits[0] < 0, (byte)((bits[0] & 0x00FF0000) >> 16));
}
internal void ReadBString(out string value) {
ushort len;
this.ReadUInt16(out len);
value = Encoding.UTF8.GetString(buffer, offset, len);
offset += len;
}
internal void ReadCString(out string value) {
int len = 0;
while (offset + len < buffer.Length && buffer[offset + len] != 0) {
len++;
}
value = Encoding.UTF8.GetString(buffer, offset, len);
offset += len + 1;
}
internal void SkipCString(out string value) {
int len = 0;
while (offset + len < buffer.Length && buffer[offset + len] != 0) {
len++;
}
offset += len + 1;
value= null;
}
internal void ReadGuid(out Guid guid) {
uint a;
ushort b;
ushort c;
byte d;
byte e;
byte f;
byte g;
byte h;
byte i;
byte j;
byte k;
ReadUInt32(out a);
ReadUInt16(out b);
ReadUInt16(out c);
ReadUInt8(out d);
ReadUInt8(out e);
ReadUInt8(out f);
ReadUInt8(out g);
ReadUInt8(out h);
ReadUInt8(out i);
ReadUInt8(out j);
ReadUInt8(out k);
guid = new Guid(a, b, c, d, e, f, g, h, i, j, k);
}
internal string ReadString() {
int len = 0;
while (offset + len < buffer.Length && buffer[offset + len] != 0) {
len+=2;
}
string result = Encoding.Unicode.GetString(buffer, offset, len);
offset += len + 2;
return result;
}
}
}
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