XZ Utils
5.1.0alpha
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I/O types and functions. More...
Data Structures | |
union | io_buf |
struct | file_pair |
Macros | |
#define | IO_BUFFER_SIZE 8192 |
Functions | |
void | io_init (void) |
Initialize the I/O module. More... | |
void | io_no_sparse (void) |
Disable creation of sparse files when decompressing. More... | |
file_pair * | io_open_src (const char *src_name) |
Open the source file. More... | |
bool | io_open_dest (file_pair *pair) |
Open the destination file. More... | |
void | io_close (file_pair *pair, bool success) |
Closes the file descriptors and frees possible allocated memory. More... | |
size_t | io_read (file_pair *pair, io_buf *buf, size_t size) |
Reads from the source file to a buffer. More... | |
void | io_fix_src_pos (file_pair *pair, size_t rewind_size) |
Fix the position in src_fd. More... | |
bool | io_pread (file_pair *pair, io_buf *buf, size_t size, off_t pos) |
Read from source file from given offset to a buffer. More... | |
bool | io_write (file_pair *pair, const io_buf *buf, size_t size) |
Writes a buffer to the destination file. More... | |
I/O types and functions.
void io_init | ( | void | ) |
Initialize the I/O module.
void io_no_sparse | ( | void | ) |
Disable creation of sparse files when decompressing.
References try_sparse.
file_pair* io_open_src | ( | const char * | src_name | ) |
Open the source file.
References io_open_src_real(), is_empty_filename(), signals_block(), signals_unblock(), and file_pair::src_name.
Referenced by coder_run(), and list_file().
bool io_open_dest | ( | file_pair * | pair | ) |
Open the destination file.
References signals_block(), and signals_unblock().
Referenced by coder_run().
void io_close | ( | file_pair * | pair, |
bool | success | ||
) |
Closes the file descriptors and frees possible allocated memory.
The success argument determines if source or destination file gets unlinked:
References file_pair::dest_fd, file_pair::dest_name, file_pair::dest_pending_sparse, file_pair::dest_try_sparse, io_close_dest(), io_close_src(), io_copy_attrs(), message_error(), signals_block(), and signals_unblock().
Referenced by coder_run(), and list_file().
Reads from the source file to a buffer.
pair | File pair having the source file open for reading |
buf | Destination buffer to hold the read data |
size | Size of the buffer; assumed be smaller than SSIZE_MAX |
References message_error(), file_pair::src_eof, file_pair::src_fd, file_pair::src_name, and user_abort.
Referenced by coder_normal(), coder_passthru(), coder_run(), and io_pread().
void io_fix_src_pos | ( | file_pair * | pair, |
size_t | rewind_size | ||
) |
Fix the position in src_fd.
This is used when –single-thream has been specified and decompression is successful. If the input file descriptor supports seeking, this function fixes the input position to point to the next byte after the decompressed stream.
pair | File pair having the source file open for reading |
rewind_size | How many bytes of extra have been read i.e. how much to seek backwards. |
References file_pair::src_fd.
Referenced by coder_normal().
Read from source file from given offset to a buffer.
This is remotely similar to standard pread(). This uses lseek() though, so the read offset is changed on each call.
pair | Seekable source file |
buf | Destination buffer |
size | Amount of data to read |
pos | Offset relative to the beginning of the file, from which the data should be read. |
References io_read(), message_error(), file_pair::src_fd, and file_pair::src_name.
Referenced by parse_block_header(), parse_check_value(), and parse_indexes().
Writes a buffer to the destination file.
pair | File pair having the destination file open for writing |
buf | Buffer containing the data to be written |
size | Size of the buffer; assumed be smaller than SSIZE_MAX |
References file_pair::dest_fd, file_pair::dest_name, file_pair::dest_pending_sparse, file_pair::dest_try_sparse, and message_error().
Referenced by coder_normal(), and coder_passthru().