Update XZ Utils to 5.0.3 (in deps)

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;
+}
+