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Diffstat (limited to 'neozip/test/minigzip.c')
| -rw-r--r-- | neozip/test/minigzip.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/neozip/test/minigzip.c b/neozip/test/minigzip.c new file mode 100644 index 0000000000..9f86018a6b --- /dev/null +++ b/neozip/test/minigzip.c @@ -0,0 +1,368 @@ +/* minigzip.c -- simulate gzip using the zlib compression library + * Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* + * minigzip is a minimal implementation of the gzip utility. This is + * only an example of using zlib and isn't meant to replace the + * full-featured gzip. No attempt is made to deal with file systems + * limiting names to 14 or 8+3 characters, etc... Error checking is + * very limited. So use minigzip only for testing; use gzip for the + * real thing. + */ + +#include "zbuild.h" +#ifdef ZLIB_COMPAT +# include "zlib.h" +#else +# include "zlib-ng.h" +#endif +#include <stdio.h> + +#include <string.h> +#include <stdlib.h> + +#ifdef USE_MMAP +# include <sys/types.h> +# include <sys/mman.h> +# include <sys/stat.h> +#endif + +#if defined(_WIN32) || defined(__CYGWIN__) +# include <fcntl.h> +# include <io.h> +# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) +#else +# define SET_BINARY_MODE(file) +#endif + +#if defined(_MSC_VER) && _MSC_VER < 1900 +# define snprintf _snprintf +#endif + +#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) +#ifndef _WIN32 /* unlink already in stdio.h for Win32 */ +extern int unlink (const char *); +#endif +#endif + +#ifndef GZ_SUFFIX +# define GZ_SUFFIX ".gz" +#endif +#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) + +#ifndef BUFLEN +# define BUFLEN 16384 /* read buffer size */ +#endif +#define BUFLENW (BUFLEN * 3) /* write buffer size */ +#define MAX_NAME_LEN 1024 + +static char *prog; + +/* =========================================================================== + * Display error message and exit + */ +static void error(const char *msg) { + fprintf(stderr, "%s: %s\n", prog, msg); + exit(1); +} + +/* =========================================================================== + * Display last error message of gzFile, close it and exit + */ + +static void gz_fatal(gzFile file) { + z_int32_t err; + fprintf(stderr, "%s: %s\n", prog, PREFIX(gzerror)(file, &err)); + PREFIX(gzclose)(file); + exit(1); +} + +#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */ +/* =========================================================================== + * Try compressing the input file at once using mmap. Return Z_OK if + * success, Z_ERRNO otherwise. + */ +static int gz_compress_mmap(FILE *in, gzFile out) { + int ifd = fileno(in); + void *buf; /* mmap'ed buffer for the entire input file */ + size_t buf_len; /* length of the input file */ + size_t len; + struct stat sb; + + /* Determine the size of the file, needed for mmap: */ + if (fstat(ifd, &sb) < 0) return Z_ERRNO; + /* Check size_t overflow */ + if (sb.st_size <= 0 || sb.st_size > PTRDIFF_MAX) return Z_ERRNO; + buf_len = (size_t)sb.st_size; + + /* Now do the actual mmap: */ + buf = mmap(NULL, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); + if (buf == MAP_FAILED) return Z_ERRNO; + + /* Compress the whole file at once: */ + len = PREFIX(gzfwrite)(buf, 1, buf_len, out); + + if (len != buf_len) gz_fatal(out); + + munmap(buf, buf_len); + fclose(in); + if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose"); + return Z_OK; +} +#endif /* USE_MMAP */ + +/* =========================================================================== + * Compress input to output then close both files. + */ + +static void gz_compress(FILE *in, gzFile out) { + char *buf; + int len; + +#ifdef USE_MMAP + /* Try first compressing with mmap. If mmap fails (minigzip used in a + * pipe), use the normal fread loop. + */ + if (gz_compress_mmap(in, out) == Z_OK) return; +#endif + buf = (char *)calloc(BUFLEN, 1); + if (buf == NULL) { + perror("out of memory"); + exit(1); + } + + for (;;) { + len = (int)fread(buf, 1, BUFLEN, in); + if (ferror(in)) { + free(buf); + perror("fread"); + exit(1); + } + if (len == 0) break; + + if (PREFIX(gzwrite)(out, buf, (unsigned)len) != len) gz_fatal(out); + } + free(buf); + fclose(in); + if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose"); +} + +/* =========================================================================== + * Uncompress input to output then close both files. + */ +static void gz_uncompress(gzFile in, FILE *out) { + char *buf = (char *)malloc(BUFLENW); + int len; + + if (buf == NULL) error("out of memory"); + + for (;;) { + len = PREFIX(gzread)(in, buf, BUFLENW); + if (len < 0) { + free(buf); + gz_fatal(in); + } + if (len == 0) break; + + if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { + free(buf); + error("failed fwrite"); + } + } + free(buf); + if (fclose(out)) error("failed fclose"); + + if (PREFIX(gzclose)(in) != Z_OK) error("failed gzclose"); +} + + +/* =========================================================================== + * Compress the given file: create a corresponding .gz file and remove the + * original. + */ +static void file_compress(char *file, char *mode, int keep) { + char outfile[MAX_NAME_LEN]; + FILE *in; + gzFile out; + + if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { + fprintf(stderr, "%s: filename too long\n", prog); + exit(1); + } + + snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX); + + in = fopen(file, "rb"); + if (in == NULL) { + perror(file); + exit(1); + } + out = PREFIX(gzopen)(outfile, mode); + if (out == NULL) { + fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); + exit(1); + } + gz_compress(in, out); + + if (!keep) + unlink(file); +} + + +/* =========================================================================== + * Uncompress the given file and remove the original. + */ +static void file_uncompress(char *file, int keep) { + char buf[MAX_NAME_LEN]; + char *infile, *outfile; + FILE *out; + gzFile in; + size_t len = strlen(file); + + if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { + fprintf(stderr, "%s: filename too long\n", prog); + exit(1); + } + + snprintf(buf, sizeof(buf), "%s", file); + + if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { + infile = file; + outfile = buf; + outfile[len-3] = '\0'; + } else { + outfile = file; + infile = buf; + snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX); + } + in = PREFIX(gzopen)(infile, "rb"); + if (in == NULL) { + fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); + exit(1); + } + out = fopen(outfile, "wb"); + if (out == NULL) { + perror(file); + exit(1); + } + + gz_uncompress(in, out); + + if (!keep) + unlink(infile); +} + +static void show_help(void) { + printf("Usage: minigzip [-c] [-d] [-k] [-f|-h|-R|-F|-T] [-A] [-0 to -9] [files...]\n\n" + " -c : write to standard output\n" + " -d : decompress\n" + " -k : keep input files\n" + " -f : compress with Z_FILTERED\n" + " -h : compress with Z_HUFFMAN_ONLY\n" + " -R : compress with Z_RLE\n" + " -F : compress with Z_FIXED\n" + " -T : stored raw\n" + " -A : auto detect type\n" + " -0 to -9 : compression level\n\n"); +} + +int main(int argc, char *argv[]) { + int copyout = 0; + int uncompr = 0; + int keep = 0; + int i = 0; + gzFile file; + char *bname, outmode[20]; + char *strategy = ""; + char *level = "6"; + char *type = "b"; + + prog = argv[i]; + bname = strrchr(argv[i], '/'); + if (bname) + bname++; + else + bname = argv[i]; + + if (!strcmp(bname, "gunzip")) + uncompr = 1; + else if (!strcmp(bname, "zcat")) + copyout = uncompr = 1; + + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-c") == 0) + copyout = 1; + else if (strcmp(argv[i], "-d") == 0) + uncompr = 1; + else if (strcmp(argv[i], "-k") == 0) + keep = 1; + else if (strcmp(argv[i], "-A") == 0) + type = ""; + else if (argv[i][0] == '-' && (argv[i][1] == 'f' || argv[i][1] == 'h' || + argv[i][1] == 'R' || argv[i][1] == 'F' || argv[i][1] == 'T') && argv[i][2] == 0) + strategy = argv[i] + 1; + else if (argv[i][0] == '-' && argv[i][1] >= '0' && argv[i][1] <= '9' && argv[i][2] == 0) + level = argv[i] + 1; + else if (strcmp(argv[i], "--help") == 0) { + show_help(); + return 0; + } else if (argv[i][0] == '-') { + show_help(); + return 64; /* EX_USAGE */ + } else { + break; + } + } + + snprintf(outmode, sizeof(outmode), "w%s%s%s", type, strategy, level); + + if (i == argc) { + SET_BINARY_MODE(stdin); + SET_BINARY_MODE(stdout); + if (uncompr) { + file = PREFIX(gzdopen)(fileno(stdin), "rb"); + if (file == NULL) error("can't gzdopen stdin"); + gz_uncompress(file, stdout); + } else { + file = PREFIX(gzdopen)(fileno(stdout), outmode); + if (file == NULL) error("can't gzdopen stdout"); + gz_compress(stdin, file); + } + } else { + if (copyout) { + SET_BINARY_MODE(stdout); + } + do { + if (uncompr) { + if (copyout) { + file = PREFIX(gzopen)(argv[i], "rb"); + if (file == NULL) + fprintf(stderr, "%s: can't gzopen %s\n", prog, argv[i]); + else + gz_uncompress(file, stdout); + } else { + file_uncompress(argv[i], keep); + } + } else { + if (copyout) { + FILE * in = fopen(argv[i], "rb"); + + if (in == NULL) { + perror(argv[i]); + } else { + file = PREFIX(gzdopen)(fileno(stdout), outmode); + if (file == NULL) error("can't gzdopen stdout"); + + gz_compress(in, file); + } + + } else { + file_compress(argv[i], outmode, keep); + } + } + } while (++i < argc); + } + return 0; +} |