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113 lines
3.1 KiB
Groff
113 lines
3.1 KiB
Groff
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.TH ARCHIVE_READ_DATA 3 "February 2, 2012" ""
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.SH NAME
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.ad l
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\fB\%archive_read_data\fP,
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\fB\%archive_read_data_block\fP,
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\fB\%archive_read_data_skip\fP,
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\fB\%archive_read_data_into_fd\fP
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\- functions for reading streaming archives
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.SH LIBRARY
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.ad l
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Streaming Archive Library (libarchive, -larchive)
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.SH SYNOPSIS
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.ad l
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\fB#include <archive.h>\fP
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.br
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\fIla_ssize_t\fP
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.br
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\fB\%archive_read_data\fP(\fI\%struct\ archive\ *\fP, \fI\%void\ *buff\fP, \fI\%size_t\ len\fP);
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.br
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\fIint\fP
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.br
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\fB\%archive_read_data_block\fP(\fI\%struct\ archive\ *\fP, \fI\%const\ void\ **buff\fP, \fI\%size_t\ *len\fP, \fI\%off_t\ *offset\fP);
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.br
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\fIint\fP
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.br
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\fB\%archive_read_data_skip\fP(\fI\%struct\ archive\ *\fP);
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.br
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\fIint\fP
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.br
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\fB\%archive_read_data_into_fd\fP(\fI\%struct\ archive\ *\fP, \fI\%int\ fd\fP);
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.SH DESCRIPTION
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.ad l
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.RS 5
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.TP
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\fB\%archive_read_data\fP()
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Read data associated with the header just read.
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Internally, this is a convenience function that calls
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\fB\%archive_read_data_block\fP()
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and fills any gaps with nulls so that callers see a single
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continuous stream of data.
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.TP
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\fB\%archive_read_data_block\fP()
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Return the next available block of data for this entry.
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Unlike
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\fB\%archive_read_data\fP(),
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the
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\fB\%archive_read_data_block\fP()
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function avoids copying data and allows you to correctly handle
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sparse files, as supported by some archive formats.
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The library guarantees that offsets will increase and that blocks
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will not overlap.
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Note that the blocks returned from this function can be much larger
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than the block size read from disk, due to compression
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and internal buffer optimizations.
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.TP
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\fB\%archive_read_data_skip\fP()
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A convenience function that repeatedly calls
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\fB\%archive_read_data_block\fP()
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to skip all of the data for this archive entry.
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Note that this function is invoked automatically by
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\fB\%archive_read_next_header2\fP()
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if the previous entry was not completely consumed.
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.TP
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\fB\%archive_read_data_into_fd\fP()
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A convenience function that repeatedly calls
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\fB\%archive_read_data_block\fP()
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to copy the entire entry to the provided file descriptor.
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.RE
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.SH RETURN VALUES
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.ad l
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Most functions return zero on success, non-zero on error.
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The possible return codes include:
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\fBARCHIVE_OK\fP
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(the operation succeeded),
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\fBARCHIVE_WARN\fP
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(the operation succeeded but a non-critical error was encountered),
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\fBARCHIVE_EOF\fP
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(end-of-archive was encountered),
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\fBARCHIVE_RETRY\fP
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(the operation failed but can be retried),
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and
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\fBARCHIVE_FATAL\fP
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(there was a fatal error; the archive should be closed immediately).
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.PP
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\fB\%archive_read_data\fP()
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returns a count of bytes actually read or zero at the end of the entry.
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On error, a value of
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\fBARCHIVE_FATAL\fP,
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\fBARCHIVE_WARN\fP,
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or
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\fBARCHIVE_RETRY\fP
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is returned.
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.SH ERRORS
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.ad l
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Detailed error codes and textual descriptions are available from the
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\fB\%archive_errno\fP()
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and
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\fB\%archive_error_string\fP()
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functions.
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.SH SEE ALSO
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.ad l
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\fBtar\fP(1),
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\fBarchive_read\fP(3),
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\fBarchive_read_extract\fP(3),
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\fBarchive_read_filter\fP(3),
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\fBarchive_read_format\fP(3),
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\fBarchive_read_header\fP(3),
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\fBarchive_read_open\fP(3),
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\fBarchive_read_set_options\fP(3),
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\fBarchive_util\fP(3),
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\fBlibarchive\fP(3),
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\fBtar\fP(5)
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