[Libreoffice-commits] core.git: Branch 'libreoffice-4-1' - 2 commits - shell/source
Mathieu Parent
mathieu.parent at nantesmetropole.fr
Wed Oct 16 07:53:06 PDT 2013
shell/source/win32/zipfile/zipfile.cxx | 115 ++++++++++++++++++++++-----------
1 file changed, 78 insertions(+), 37 deletions(-)
New commits:
commit e09cfff67b021efd04235987f9c27cea3da5c72b
Author: Mathieu Parent <mathieu.parent at nantesmetropole.fr>
Date: Mon Oct 14 22:23:05 2013 +0100
fdo#56007 - Read more bytes on Zip read (for thumbnails)
Change-Id: Ia8c6caa44ed8019a8139beb5a855f0f28805544d
Signed-off-by: Andras Timar <andras.timar at collabora.com>
diff --git a/shell/source/win32/zipfile/zipfile.cxx b/shell/source/win32/zipfile/zipfile.cxx
index cf05a56..270fbe1 100644
--- a/shell/source/win32/zipfile/zipfile.cxx
+++ b/shell/source/win32/zipfile/zipfile.cxx
@@ -118,18 +118,42 @@ static unsigned char readByte(StreamInterface *stream)
static unsigned short readShort(StreamInterface *stream)
{
- unsigned short p0 = (unsigned short)readByte(stream);
- unsigned short p1 = (unsigned short)readByte(stream);
- return (unsigned short)(p0|(p1<<8));
+ if (!stream || stream->stell() == -1)
+ throw IOException(-1);
+ unsigned short tmpBuf;
+ unsigned long numBytesRead = stream->sread(
+ reinterpret_cast<unsigned char *>( &tmpBuf ), 2);
+ if (numBytesRead != 2)
+ throw IOException(-1);
+ return tmpBuf;
}
static unsigned readInt(StreamInterface *stream)
{
- unsigned p0 = (unsigned)readByte(stream);
- unsigned p1 = (unsigned)readByte(stream);
- unsigned p2 = (unsigned)readByte(stream);
- unsigned p3 = (unsigned)readByte(stream);
- return (unsigned)(p0|(p1<<8)|(p2<<16)|(p3<<24));
+ if (!stream || stream->stell() == -1)
+ throw IOException(-1);
+ unsigned tmpBuf;
+ unsigned long numBytesRead = stream->sread(
+ reinterpret_cast<unsigned char *>( &tmpBuf ), 4);
+ if (numBytesRead != 4)
+ throw IOException(-1);
+ return tmpBuf;
+}
+
+static std::string readString(StreamInterface *stream, unsigned long size)
+{
+ if (!stream || stream->stell() == -1)
+ throw IOException(-1);
+ unsigned char *tmp = new unsigned char[size];
+ if (!tmp)
+ throw IOException(-1);
+ unsigned long numBytesRead = stream->sread(tmp, size);
+ if (numBytesRead != size)
+ throw IOException(-1);
+
+ std::string aStr((char *)tmp, size);
+ delete [] tmp;
+ return aStr;
}
static bool readCentralDirectoryEnd(StreamInterface *stream, CentralDirectoryEnd &end)
@@ -147,9 +171,7 @@ static bool readCentralDirectoryEnd(StreamInterface *stream, CentralDirectoryEnd
end.cdir_size = readInt(stream);
end.cdir_offset = readInt(stream);
end.comment_size = readShort(stream);
- end.comment.clear();
- for (unsigned short i = 0; i < end.comment_size; i++)
- end.comment.append(1,(char)readByte(stream));
+ end.comment.assign(readString(stream, end.comment_size));
}
catch (...)
{
@@ -183,15 +205,9 @@ static bool readCentralDirectoryEntry(StreamInterface *stream, CentralDirectoryE
entry.external_attr = readInt(stream);
entry.offset = readInt(stream);
unsigned short i = 0;
- entry.filename.clear();
- for (i=0; i < entry.filename_size; i++)
- entry.filename.append(1,(char)readByte(stream));
- entry.extra_field.clear();
- for (i=0; i < entry.extra_field_size; i++)
- entry.extra_field.append(1,(char)readByte(stream));
- entry.file_comment.clear();
- for (i=0; i < entry.file_comment_size; i++)
- entry.file_comment.append(1,(char)readByte(stream));
+ entry.filename.assign(readString(stream, entry.filename_size));
+ entry.extra_field.assign(readString(stream, entry.extra_field_size));
+ entry.file_comment.assign(readString(stream, entry.file_comment_size));
}
catch (...)
{
@@ -219,12 +235,8 @@ static bool readLocalFileHeader(StreamInterface *stream, LocalFileHeader &header
header.filename_size = readShort(stream);
header.extra_field_size = readShort(stream);
unsigned short i = 0;
- header.filename.clear();
- for (i=0; i < header.filename_size; i++)
- header.filename.append(1,(char)readByte(stream));
- header.extra_field.clear();
- for (i=0; i < header.extra_field_size; i++)
- header.extra_field.append(1,(char)readByte(stream));
+ header.filename.assign(readString(stream, header.filename_size));
+ header.extra_field.assign(readString(stream, header.extra_field_size));
}
catch (...)
{
commit 0540be231b0a10ed97da911462874a329bd089f7
Author: Michael Meeks <michael.meeks at collabora.com>
Date: Fri Oct 11 17:43:19 2013 +0100
fdo#56007 - fast zip directory find to accelerate Windows Explorer thumbnail.
Change-Id: Id9436def56f40d2bb54dea35bea916bd99964653
Signed-off-by: Andras Timar <andras.timar at collabora.com>
diff --git a/shell/source/win32/zipfile/zipfile.cxx b/shell/source/win32/zipfile/zipfile.cxx
index fb7dc88..cf05a56 100644
--- a/shell/source/win32/zipfile/zipfile.cxx
+++ b/shell/source/win32/zipfile/zipfile.cxx
@@ -102,6 +102,9 @@ struct CentralDirectoryEnd
#define LOC_FILE_HEADER_SIG 0x04034b50
#define CDIR_END_SIG 0x06054b50
+// This little lot performs in a truly appalling way without
+// buffering eg. on an IStream.
+
static unsigned char readByte(StreamInterface *stream)
{
if (!stream || stream->stell() == -1)
@@ -250,31 +253,57 @@ static bool areHeadersConsistent(const LocalFileHeader &header, const CentralDir
return true;
}
+#define BLOCK_SIZE 0x800
+
+static bool findSignatureAtOffset(StreamInterface *stream, unsigned long nOffset)
+{
+ // read in reasonably sized chunk, and read more, to get overlapping sigs
+ unsigned char aBuffer[ BLOCK_SIZE + 4 ];
+
+ stream->sseek(nOffset, SEEK_SET);
+
+ unsigned long nBytesRead = stream->sread(aBuffer, sizeof(aBuffer));
+ if (nBytesRead < 0)
+ return false;
+
+ for (long n = nBytesRead - 4; n >= 0; n--)
+ {
+ if (aBuffer[n ] == 0x50 && aBuffer[n+1] == 0x4b &&
+ aBuffer[n+2] == 0x05 && aBuffer[n+3] == 0x06)
+ { // a palpable hit ...
+ stream->sseek(nOffset + n, SEEK_SET);
+ return true;
+ }
+ }
+
+ return false;
+}
+
static bool findCentralDirectoryEnd(StreamInterface *stream)
{
if (!stream)
return false;
- stream->sseek(0, SEEK_SET);
- if (stream->sseek(-1024, SEEK_END)) stream->sseek(0, SEEK_SET);
+
+ stream->sseek(0,SEEK_END);
+
+ long nLength = stream->stell();
+ if (nLength == -1)
+ return false;
+
try
{
- while (stream->stell() != -1)
+ for (long nOffset = nLength - BLOCK_SIZE;
+ nOffset > 0; nOffset -= BLOCK_SIZE)
{
- unsigned signature = readInt(stream);
- if (signature == CDIR_END_SIG)
- {
- stream->sseek(-4, SEEK_CUR);
+ if (findSignatureAtOffset(stream, nOffset))
return true;
- }
- else
- stream->sseek(-3, SEEK_CUR);
}
+ return findSignatureAtOffset(stream, 0);
}
catch (...)
{
return false;
}
- return false;
}
static bool isZipStream(StreamInterface *stream)
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