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fs/io/FileReader: add method Seek()

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This commit is contained in:
Max Kellermann 2015-03-03 14:29:36 +01:00
parent ef5090c397
commit dd5daa0767
2 changed files with 28 additions and 0 deletions
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26
src/fs/io/FileReader.cxx
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@ -52,6 +52,19 @@ FileReader::Read(void *data, size_t size, Error &error)
return nbytes;
}
bool
FileReader::Seek(off_t offset, Error &error)
{
assert(IsDefined());
auto result = SetFilePointer(handle, offset, nullptr, FILE_BEGIN);
const bool success = result != INVALID_SET_FILE_POINTER;
if (!success)
error.SetLastError("Failed to seek");
return success;
}
void
FileReader::Close()
{
@ -90,6 +103,19 @@ FileReader::Read(void *data, size_t size, Error &error)
return nbytes;
}
bool
FileReader::Seek(off_t offset, Error &error)
{
assert(IsDefined());
auto result = lseek(fd, offset, SEEK_SET);
const bool success = result >= 0;
if (!success)
error.SetErrno("Failed to seek");
return success;
}
void
FileReader::Close()
{

2
src/fs/io/FileReader.hxx
View File

@ -61,6 +61,8 @@ public:
void Close();
bool Seek(off_t offset, Error &error);
/* virtual methods from class Reader */
size_t Read(void *data, size_t size, Error &error) override;
};