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text writing

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git-svn-id: https://profuse.googlecode.com/svn/branches/v2@304 aa027e90-d47c-11dd-86d7-074df07e0730
This commit is contained in:
ksherlock
2010-05-31 00:06:51 +00:00
parent e3d0514c85
commit f07a6ecd8b
4 changed files with 216 additions and 11 deletions
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Pascal/FileEntry.cpp
+72 -10
View File
@@ -6,6 +6,7 @@
#include <cerrno>
#include <Pascal/Pascal.h>
#include <Pascal/TextWriter.h>
#include <ProFUSE/auto.h>
#include <ProFUSE/Exception.h>
@@ -176,12 +177,21 @@ int FileEntry::truncate(unsigned newSize)
if (fileKind() == kTextFile)
{
if (newSize)
throw ProFUSE::Exception(__METHOD__ ": unable to truncate text file.");
{
errno = EINVAL;
return -1;
}
newSize = 2; // text files have a 2-page scratch buffer for the editor.
if (_pageSize) _pageSize->clear();
if (_pageSize)
{
_pageSize->clear();
_fileSize = 0;
}
}
truncateCommon(newSize);
if (truncateCommon(newSize) != 0)
return -1;
_modification = Date::Today();
parent()->writeEntry(this);
@@ -194,19 +204,22 @@ int FileEntry::truncate(unsigned newSize)
* updates _lastByte and _lastBlock but does
* not update _modification or commit to disk.
*/
void FileEntry::truncateCommon(unsigned newSize)
int FileEntry::truncateCommon(unsigned newSize)
{
#undef __METHOD__
#define __METHOD__ "FileEntry::truncateCommon"
unsigned currentSize = fileSize();
if (newSize == currentSize) return;
if (newSize == currentSize) return 0;
if (newSize > currentSize)
{
if (newSize > _maxFileSize)
throw ProFUSE::POSIXException(__METHOD__ ": Unable to expand file.", ENOSPC);
{
errno = ENOSPC;
return -1;
}
unsigned remainder = newSize - currentSize;
unsigned block = _lastBlock - 1;
@@ -245,17 +258,65 @@ void FileEntry::truncateCommon(unsigned newSize)
_lastByte = newSize % 512;
if (_lastByte == 0) _lastByte = 512;
return 0;
}
int FileEntry::write(TextWriter &text)
{
unsigned blocks = text.blocks();
if (parent()->readOnly())
{
errno = EROFS;
return -1;
}
if (fileKind() != kTextFile)
{
errno = EINVAL;
return -1;
}
if (blocks * 512 > _maxFileSize)
{
errno = ENOSPC;
return -1;
}
for (unsigned i = 0; i < blocks; ++i)
{
void *buffer = text.data(i);
parent()->writeBlock(_firstBlock + i, buffer);
}
_modification = Date::Today();
_lastBlock = 1 + firstBlock() + blocks;
_lastByte = 512;
parent()->writeEntry(this);
parent()->sync();
return blocks * 512;
}
int FileEntry::write(uint8_t *buffer, unsigned size, unsigned offset)
{
#undef __METHOD__
#define __METHOD__ "FileEntry::write"
if (parent()->readOnly())
{
errno = EROFS;
return -1;
}
if (fileKind() == kTextFile)
{
throw ProFUSE::Exception(__METHOD__ ": Text Files are too weird.");
errno = EINVAL;
return -1;
}
unsigned currentSize = fileSize();
@@ -265,17 +326,18 @@ int FileEntry::write(uint8_t *buffer, unsigned size, unsigned offset)
if (newSize > _maxFileSize)
{
throw ProFUSE::POSIXException(__METHOD__ ": Unable to expand file.", ENOSPC);
errno = ENOSPC;
return -1;
}
if (offset > currentSize)
{
truncateCommon(offset);
if (truncateCommon(offset) != 0) return -1;
}
// now write the data...
unsigned block = _firstBlock + offset / 512;
unsigned block = firstBlock() + offset / 512;
unsigned start = offset % 512;
unsigned remainder = size;