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download_to_file() with offset

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This commit is contained in:
David Rose 2002-10-19 02:28:45 +00:00
parent 92082c21d1
commit 5d56f13f1a
2 changed files with 28 additions and 2 deletions
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28
panda/src/downloader/httpChannel.cxx
View File

@ -415,18 +415,44 @@ read_body() {
// At this time, it is possible that a communications // At this time, it is possible that a communications
// error will have left a partial file, so // error will have left a partial file, so
// is_download_complete() may be called to test this. // is_download_complete() may be called to test this.
//
// If first_byte is nonzero, it specifies the first byte
// within the file (zero-based) at which to start
// writing the downloaded data. This can work well in
// conjunction with get_subdocument() to restart a
// previously-interrupted download.
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
bool HTTPChannel:: bool HTTPChannel::
download_to_file(const Filename &filename) { download_to_file(const Filename &filename, size_t first_byte) {
reset_download_to(); reset_download_to();
_download_to_filename = filename; _download_to_filename = filename;
_download_to_filename.set_binary(); _download_to_filename.set_binary();
_download_to_file.close();
_download_to_file.clear();
if (!_download_to_filename.open_write(_download_to_file)) { if (!_download_to_filename.open_write(_download_to_file)) {
downloader_cat.info() downloader_cat.info()
<< "Could not open " << filename << " for writing.\n"; << "Could not open " << filename << " for writing.\n";
return false; return false;
} }
if (first_byte != 0) {
// Windows doesn't complain if you try to seek past the end of
// file--it happily appends enough zero bytes to make the
// difference. Blecch. That means we need to get the file size
// first to check it ourselves.
_download_to_file.seekp(0, ios::end);
if (first_byte > (size_t)_download_to_file.tellp()) {
downloader_cat.info()
<< "Invalid starting position of byte " << first_byte << " within "
<< _download_to_filename << " (which has "
<< _download_to_file.tellp() << " bytes)\n";
_download_to_file.close();
return false;
}
_download_to_file.seekp(first_byte);
}
_download_dest = DD_file; _download_dest = DD_file;
if (_nonblocking) { if (_nonblocking) {

2
panda/src/downloader/httpChannel.h
View File

@ -115,7 +115,7 @@ PUBLISHED:
bool run(); bool run();
ISocketStream *read_body(); ISocketStream *read_body();
bool download_to_file(const Filename &filename); bool download_to_file(const Filename &filename, size_t first_byte = 0);
bool download_to_ram(Ramfile *ramfile); bool download_to_ram(Ramfile *ramfile);
INLINE size_t get_bytes_downloaded() const; INLINE size_t get_bytes_downloaded() const;