XZ Utils 5.4.1
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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_write_to_user_abort_pipe (void) |
Write a byte to user_abort_pipe[1]. 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_seek_src (file_pair *pair, uint64_t pos) |
Seek to the given absolute position in the source file. More... | |
bool | io_pread (file_pair *pair, io_buf *buf, size_t size, uint64_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_write_to_user_abort_pipe | ( | void | ) |
Write a byte to user_abort_pipe[1].
This is called from a signal handler.
void io_no_sparse | ( | void | ) |
Disable creation of sparse files when decompressing.
References try_sparse.
file_pair * io_open_src | ( | const char * | src_name | ) |
bool io_open_dest | ( | file_pair * | pair | ) |
Open the destination file.
References signals_block().
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_pending_sparse, file_pair::dest_try_sparse, and message_error().
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 |
Referenced by coder_passthru(), 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. |
bool io_seek_src | ( | file_pair * | pair, |
uint64_t | pos | ||
) |
Seek to the given absolute position in the source file.
This calls lseek() and also clears pair->src_eof.
pair | Seekable source file |
pos | Offset relative to the beginning of the file, from which the data should be read. |
References message_bug(), message_error(), file_pair::src_fd, and file_pair::src_st.
Referenced by io_pread().
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(), io_seek_src(), and message_error().
Referenced by parse_check_value().
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 |
Referenced by coder_passthru().