105 lines
2.5 KiB
C#
105 lines
2.5 KiB
C#
// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.IO;
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namespace Microsoft.Cci.Pdb {
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internal class DataStream {
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internal DataStream() {
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}
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internal DataStream(int contentSize, BitAccess bits, int count) {
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this.contentSize = contentSize;
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if (count > 0) {
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this.pages = new int[count];
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bits.ReadInt32(this.pages);
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}
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}
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internal void Read(PdbReader reader, BitAccess bits) {
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bits.MinCapacity(contentSize);
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Read(reader, 0, bits.Buffer, 0, contentSize);
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}
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internal void Read(PdbReader reader, int position,
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byte[] bytes, int offset, int data) {
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if (position + data > contentSize) {
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throw new PdbException("DataStream can't read off end of stream. " +
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"(pos={0},siz={1})",
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position, data);
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}
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if (position == contentSize) {
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return;
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}
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int left = data;
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int page = position / reader.pageSize;
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int rema = position % reader.pageSize;
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// First get remained of first page.
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if (rema != 0) {
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int todo = reader.pageSize - rema;
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if (todo > left) {
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todo = left;
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}
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reader.Seek(pages[page], rema);
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reader.Read(bytes, offset, todo);
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offset += todo;
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left -= todo;
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page++;
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}
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// Now get the remaining pages.
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while (left > 0) {
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int todo = reader.pageSize;
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if (todo > left) {
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todo = left;
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}
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reader.Seek(pages[page], 0);
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reader.Read(bytes, offset, todo);
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offset += todo;
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left -= todo;
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page++;
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}
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}
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//private void AddPages(int page0, int count) {
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// if (pages == null) {
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// pages = new int[count];
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// for (int i = 0; i < count; i++) {
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// pages[i] = page0 + i;
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// }
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// } else {
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// int[] old = pages;
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// int used = old.Length;
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// pages = new int[used + count];
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// Array.Copy(old, pages, used);
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// for (int i = 0; i < count; i++) {
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// pages[used + i] = page0 + i;
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// }
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// }
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//}
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//internal int Pages {
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// get { return pages == null ? 0 : pages.Length; }
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//}
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internal int Length {
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get { return contentSize; }
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}
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//internal int GetPage(int index) {
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// return pages[index];
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//}
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internal int contentSize;
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internal int[] pages;
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}
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}
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