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comparison src/org/tmatesoft/hg/internal/RevlogStream.java @ 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 e39cf474ef94
children ad6a046943be
comparison
equal deleted inserted replaced
222:373e07cd3991 223:80a3433ace91
243 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty 243 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
244 daIndex.readBytes(nodeidBuf, 0, 20); // +32 244 daIndex.readBytes(nodeidBuf, 0, 20); // +32
245 daIndex.skip(12); 245 daIndex.skip(12);
246 DataAccess userDataAccess = null; 246 DataAccess userDataAccess = null;
247 if (needData) { 247 if (needData) {
248 final byte firstByte;
249 int streamOffset; 248 int streamOffset;
250 DataAccess streamDataAccess; 249 DataAccess streamDataAccess;
251 if (inline) { 250 if (inline) {
252 streamDataAccess = daIndex; 251 streamDataAccess = daIndex;
253 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream 252 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
255 streamOffset = (int) offset; 254 streamOffset = (int) offset;
256 streamDataAccess = daData; 255 streamDataAccess = daData;
257 daData.seek(streamOffset); 256 daData.seek(streamOffset);
258 } 257 }
259 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch 258 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
260 firstByte = streamDataAccess.readByte(); 259 if (streamDataAccess.isEmpty()) {
261 if (firstByte == 0x78 /* 'x' */) { 260 userDataAccess = new DataAccess(); // empty
262 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
263 } else if (firstByte == 0x75 /* 'u' */) {
264 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
265 } else { 261 } else {
266 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0' 262 final byte firstByte = streamDataAccess.readByte();
267 // but I don't see reason not to return data as is 263 if (firstByte == 0x78 /* 'x' */) {
268 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen); 264 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
265 } else if (firstByte == 0x75 /* 'u' */) {
266 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
267 } else {
268 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
269 // but I don't see reason not to return data as is
270 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
271 }
269 } 272 }
270 // XXX 273 // XXX
271 if (patchToPrevious) { 274 if (patchToPrevious) {
272 // this is a patch 275 // this is a patch
273 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>(); 276 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();