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changeset 223:80a3433ace91

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HgBadStateException (IOException from FileAccess) on isCopy for empty data file
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 23 May 2011 04:42:12 +0200
parents 373e07cd3991
children 7fe5982bcac0
files src/org/tmatesoft/hg/internal/RevlogStream.java
diffstat 1 files changed, 12 insertions(+), 9 deletions(-) [+]
line wrap: on
line diff
--- a/src/org/tmatesoft/hg/internal/RevlogStream.java	Thu May 19 05:02:07 2011 +0200
+++ b/src/org/tmatesoft/hg/internal/RevlogStream.java	Mon May 23 04:42:12 2011 +0200
@@ -245,7 +245,6 @@
 				daIndex.skip(12);
 				DataAccess userDataAccess = null;
 				if (needData) {
-					final byte firstByte;
 					int streamOffset;
 					DataAccess streamDataAccess;
 					if (inline) {
@@ -257,15 +256,19 @@
 						daData.seek(streamOffset);
 					}
 					final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
-					firstByte = streamDataAccess.readByte();
-					if (firstByte == 0x78 /* 'x' */) {
-						userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
-					} else if (firstByte == 0x75 /* 'u' */) {
-						userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
+					if (streamDataAccess.isEmpty()) {
+						userDataAccess = new DataAccess(); // empty
 					} else {
-						// XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
-						// but I don't see reason not to return data as is 
-						userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
+						final byte firstByte = streamDataAccess.readByte();
+						if (firstByte == 0x78 /* 'x' */) {
+							userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
+						} else if (firstByte == 0x75 /* 'u' */) {
+							userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
+						} else {
+							// XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
+							// but I don't see reason not to return data as is 
+							userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
+						}
 					}
 					// XXX 
 					if (patchToPrevious) {