Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/tests/create_compress_files.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       create_compress_files.c
+/// \brief      Creates bunch of test files to be compressed
+///
+/// Using a test file generator program saves space in the source code
+/// package considerably.
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include <stdio.h>
+
+
+// Avoid re-creating the test files every time the tests are run.
+#define create_test(name) \
+do { \
+        if (!file_exists("compress_generated_" #name)) { \
+                FILE *file = file_create("compress_generated_" #name); \
+                write_ ## name(file); \
+                file_finish(file, "compress_generated_" #name); \
+        } \
+} while (0)
+
+
+static bool
+file_exists(const char *filename)
+{
+        // Trying to be somewhat portable by avoiding stat().
+        FILE *file = fopen(filename, "rb");
+        bool ret;
+
+        if (file != NULL) {
+                fclose(file);
+                ret = true;
+        } else {
+                ret = false;
+        }
+
+        return ret;
+}
+
+
+static FILE *
+file_create(const char *filename)
+{
+        FILE *file = fopen(filename, "wb");
+
+        if (file == NULL) {
+                perror(filename);
+                exit(1);
+        }
+
+        return file;
+}
+
+
+static void
+file_finish(FILE *file, const char *filename)
+{
+        const bool ferror_fail = ferror(file);
+        const bool fclose_fail = fclose(file);
+
+        if (ferror_fail || fclose_fail) {
+                perror(filename);
+                exit(1);
+        }
+}
+
+
+// File that repeats "abc\n" a few thousand times. This is targeted
+// especially at Subblock filter's run-length encoder.
+static void
+write_abc(FILE *file)
+{
+        for (size_t i = 0; i < 12345; ++i)
+                fwrite("abc\n", 4, 1, file);
+}
+
+
+// File that doesn't compress. We always use the same random seed to
+// generate identical files on all systems.
+static void
+write_random(FILE *file)
+{
+        uint32_t n = 5;
+
+        for (size_t i = 0; i < 123456; ++i) {
+                n = 101771 * n + 71777;
+
+                putc(n & 0xFF, file);
+                putc((n >> 8) & 0xFF, file);
+                putc((n >> 16) & 0xFF, file);
+                putc(n >> 24, file);
+        }
+}
+
+
+// Text file
+static void
+write_text(FILE *file)
+{
+        static const char *lorem[] = {
+                "Lorem", "ipsum", "dolor", "sit", "amet,", "consectetur",
+                "adipisicing", "elit,", "sed", "do", "eiusmod", "tempor",
+                "incididunt", "ut", "labore", "et", "dolore", "magna",
+                "aliqua.", "Ut", "enim", "ad", "minim", "veniam,", "quis",
+                "nostrud", "exercitation", "ullamco", "laboris", "nisi",
+                "ut", "aliquip", "ex", "ea", "commodo", "consequat.",
+                "Duis", "aute", "irure", "dolor", "in", "reprehenderit",
+                "in", "voluptate", "velit", "esse", "cillum", "dolore",
+                "eu", "fugiat", "nulla", "pariatur.", "Excepteur", "sint",
+                "occaecat", "cupidatat", "non", "proident,", "sunt", "in",
+                "culpa", "qui", "officia", "deserunt", "mollit", "anim",
+                "id", "est", "laborum."
+        };
+
+        // Let the first paragraph be the original text.
+        for (size_t w = 0; w < ARRAY_SIZE(lorem); ++w) {
+                fprintf(file, "%s ", lorem[w]);
+
+                if (w % 7 == 6)
+                        fprintf(file, "\n");
+        }
+
+        // The rest shall be (hopefully) meaningless combinations of
+        // the same words.
+        uint32_t n = 29;
+
+        for (size_t p = 0; p < 500; ++p) {
+                fprintf(file, "\n\n");
+
+                for (size_t w = 0; w < ARRAY_SIZE(lorem); ++w) {
+                        n = 101771 * n + 71777;
+
+                        fprintf(file, "%s ", lorem[n % ARRAY_SIZE(lorem)]);
+
+                        if (w % 7 == 6)
+                                fprintf(file, "\n");
+                }
+        }
+}
+
+
+int
+main(void)
+{
+        create_test(abc);
+        create_test(random);
+        create_test(text);
+        return 0;
+}