/symbols/pdb/Microsoft.Cci.Pdb/BitAccess.cs
http://github.com/jbevain/cecil · C# · 253 lines · 194 code · 37 blank · 22 comment · 16 complexity · d2e7e71e82b0a0f6026b6db546a5eacf MD5 · raw file
- // Copyright (c) Microsoft. All rights reserved.
- // Licensed under the MIT license. See LICENSE file in the project root for full license information.
- 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 BitAccess(byte[] buffer) {
- this.buffer = buffer;
- offset = 0;
- }
- 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 string ReadBString(int len) {
- var result = Encoding.UTF8.GetString(buffer, offset, len);
- offset += len;
- return result;
- }
- 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;
- }
- }
- }