Update XZ Utils to 5.0.4 (third_party)

doc/examples/xz_pipe_comp.c

-/*
- * xz_pipe_comp.c
- * A simple example of pipe-only xz compressor implementation.
- * version: 2010-07-12 - by Daniel Mealha Cabrita
- * Not copyrighted -- provided to the public domain.
- *
- * Compiling:
- * Link with liblzma. GCC example:
- * $ gcc -llzma xz_pipe_comp.c -o xz_pipe_comp
- *
- * Usage example:
- * $ cat some_file | ./xz_pipe_comp > some_file.xz
- */
-
-#include <stdio.h>
-#include <stdint.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <lzma.h>
-
-
-/* COMPRESSION SETTINGS */
-
-/* analogous to xz CLI options: -0 to -9 */
-#define COMPRESSION_LEVEL 6
-
-/* boolean setting, analogous to xz CLI option: -e */
-#define COMPRESSION_EXTREME true
-
-/* see: /usr/include/lzma/check.h LZMA_CHECK_* */
-#define INTEGRITY_CHECK LZMA_CHECK_CRC64
-
-
-/* read/write buffer sizes */
-#define IN_BUF_MAX      4096
-#define OUT_BUF_MAX     4096
-
-/* error codes */
-#define RET_OK                  0
-#define RET_ERROR_INIT          1
-#define RET_ERROR_INPUT         2
-#define RET_ERROR_OUTPUT        3
-#define RET_ERROR_COMPRESSION   4
-
-
-/* note: in_file and out_file must be open already */
-int xz_compress (FILE *in_file, FILE *out_file)
-{
-        uint32_t preset = COMPRESSION_LEVEL | (COMPRESSION_EXTREME ? LZMA_PRESET_EXTREME : 0);
-        lzma_check check = INTEGRITY_CHECK;
-        lzma_stream strm = LZMA_STREAM_INIT; /* alloc and init lzma_stream struct */
-        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 encoder */
-        ret_xz = lzma_easy_encoder (&strm, preset, check);
-        if (ret_xz != LZMA_OK) {
-                fprintf (stderr, "lzma_easy_encoder 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 xz data
-                   with LZMA_FINISH */
-                action = in_finished ? LZMA_FINISH : LZMA_RUN;
-
-                /* loop until there's no pending compressed output */
-                do {
-                        /* out_buf is clean at this point */
-                        strm.next_out = out_buf;
-                        strm.avail_out = OUT_BUF_MAX;
-
-                        /* compress 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_COMPRESSION;
-                        } else {
-                                /* write compressed 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);
-        }
-
-        lzma_end (&strm);
-        return ret;
-}
-
-int main ()
-{
-        int ret;
-
-        ret = xz_compress (stdin, stdout);
-        return ret;
-}
-