xz_pipe_decomp.c File Reference

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>
#include <lzma.h>

Go to the source code of this file.

Macros
#define	IN_BUF_MAX   4096
#define	OUT_BUF_MAX   4096
#define	RET_OK   0
#define	RET_ERROR_INIT   1
#define	RET_ERROR_INPUT   2
#define	RET_ERROR_OUTPUT   3
#define	RET_ERROR_DECOMPRESSION   4

Functions
int	xz_decompress (FILE *in_file, FILE *out_file)
int	main ()

Macro Definition Documentation

IN_BUF_MAX

#define IN_BUF_MAX   4096

Definition at line 23 of file xz_pipe_decomp.c.

OUT_BUF_MAX

#define OUT_BUF_MAX   4096

Definition at line 24 of file xz_pipe_decomp.c.

RET_ERROR_DECOMPRESSION

#define RET_ERROR_DECOMPRESSION   4

Definition at line 31 of file xz_pipe_decomp.c.

RET_ERROR_INIT

#define RET_ERROR_INIT   1

Definition at line 28 of file xz_pipe_decomp.c.

RET_ERROR_INPUT

#define RET_ERROR_INPUT   2

Definition at line 29 of file xz_pipe_decomp.c.

RET_ERROR_OUTPUT

#define RET_ERROR_OUTPUT   3

Definition at line 30 of file xz_pipe_decomp.c.

RET_OK

#define RET_OK   0

Definition at line 27 of file xz_pipe_decomp.c.

Function Documentation

main()

int main

(

void

)

Definition at line 116 of file xz_pipe_decomp.c.

{
    int ret;
 
    ret = xz_decompress (stdin, stdout);
    return ret;
}

References xz_decompress().

xz_decompress()

int xz_decompress	(	FILE *	in_file,
		FILE *	out_file
	)

Definition at line 35 of file xz_pipe_decomp.c.

{
    lzma_stream strm = LZMA_STREAM_INIT; /* alloc and init lzma_stream struct */
    const uint32_t flags = LZMA_TELL_UNSUPPORTED_CHECK | LZMA_CONCATENATED;
    const uint64_t memory_limit = UINT64_MAX; /* no memory limit */
    uint8_t in_buf [IN_BUF_MAX];
    uint8_t out_buf [OUT_BUF_MAX];
    size_t in_len;  /* length of useful data in in_buf */
    size_t out_len; /* length of useful data in out_buf */
    bool in_finished = false;
    bool out_finished = false;
    lzma_action action;
    lzma_ret ret_xz;
    int ret;
 
    ret = RET_OK;
 
    /* initialize xz decoder */
    ret_xz = lzma_stream_decoder (&strm, memory_limit, flags);
    if (ret_xz != LZMA_OK) {
        fprintf (stderr, "lzma_stream_decoder error: %d\n", (int) ret_xz);
        return RET_ERROR_INIT;
    }
 
    while ((! in_finished) && (! out_finished)) {
        /* read incoming data */
        in_len = fread (in_buf, 1, IN_BUF_MAX, in_file);
 
        if (feof (in_file)) {
            in_finished = true;
        }
        if (ferror (in_file)) {
            in_finished = true;
            ret = RET_ERROR_INPUT;
        }
 
        strm.next_in = in_buf;
        strm.avail_in = in_len;
 
        /* if no more data from in_buf, flushes the
           internal xz buffers and closes the decompressed data
           with LZMA_FINISH */
        action = in_finished ? LZMA_FINISH : LZMA_RUN;
 
        /* loop until there's no pending decompressed output */
        do {
            /* out_buf is clean at this point */
            strm.next_out = out_buf;
            strm.avail_out = OUT_BUF_MAX;
 
            /* decompress data */
            ret_xz = lzma_code (&strm, action);
 
            if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END)) {
                fprintf (stderr, "lzma_code error: %d\n", (int) ret_xz);
                out_finished = true;
                ret = RET_ERROR_DECOMPRESSION;
            } else {
                /* write decompressed data */
                out_len = OUT_BUF_MAX - strm.avail_out;
                fwrite (out_buf, 1, out_len, out_file);
                if (ferror (out_file)) {
                    out_finished = true;
                    ret = RET_ERROR_OUTPUT;
                }
            }
        } while (strm.avail_out == 0);
    }
 
    /* Bug fix (2012-06-14): If no errors were detected, check
       that the last lzma_code() call returned LZMA_STREAM_END.
       If not, the file is probably truncated. */
    if ((ret == RET_OK) && (ret_xz != LZMA_STREAM_END)) {
        fprintf (stderr, "Input truncated or corrupt\n");
        ret = RET_ERROR_DECOMPRESSION;
    }
 
    lzma_end (&strm);
    return ret;
}

References test-lz4-speed::action, lzma_stream::avail_in, lzma_stream::avail_out, flags, in_buf, IN_BUF_MAX, LZMA_CONCATENATED, LZMA_FINISH, LZMA_OK, LZMA_RUN, LZMA_STREAM_END, LZMA_STREAM_INIT, LZMA_TELL_UNSUPPORTED_CHECK, lzma_stream::next_in, lzma_stream::next_out, out_buf, OUT_BUF_MAX, RET_ERROR_DECOMPRESSION, RET_ERROR_INIT, RET_ERROR_INPUT, RET_ERROR_OUTPUT, RET_OK, strm, and UINT64_MAX.

Referenced by main().