diff options
Diffstat (limited to 'examples/unbwt.c')
| -rw-r--r-- | examples/unbwt.c | 166 |
1 files changed, 126 insertions, 40 deletions
diff --git a/examples/unbwt.c b/examples/unbwt.c index a0aae45..c0f19e9 100644 --- a/examples/unbwt.c +++ b/examples/unbwt.c @@ -24,98 +24,184 @@ * OTHER DEALINGS IN THE SOFTWARE. */ -#ifdef HAVE_CONFIG_H +#if HAVE_CONFIG_H # include "config.h" #endif -#include <divsufsort.h> #include <stdio.h> +#if HAVE_STRING_H +# include <string.h> +#endif #if HAVE_STDLIB_H # include <stdlib.h> #endif -#if HAVE_STRING_H -# if !STDC_HEADERS && HAVE_MEMORY_H -# include <memory.h> -# endif -# include <string.h> +#if HAVE_MEMORY_H +# include <memory.h> +#endif +#if HAVE_STDDEF_H +# include <stddef.h> #endif #if HAVE_STRINGS_H # include <strings.h> #endif +#if HAVE_SYS_TYPES_H +# include <sys/types.h> +#endif +#if HAVE_IO_H && HAVE_FCNTL_H +# include <io.h> +# include <fcntl.h> +#endif #include <time.h> +#include <divsufsort.h> +#include "lfs.h" +static +size_t +read_int(FILE *fp, saidx_t *n) { + unsigned char c[4]; + size_t m = fread(c, sizeof(unsigned char), 4, fp); + if(m == 4) { + *n = (c[0] << 0) | (c[1] << 8) | + (c[2] << 16) | (c[3] << 24); + } + return m; +} + +static +void +print_help(const char *progname, int status) { + fprintf(stderr, + "unbwt, an inverse burrows-wheeler transform program, version %s.\n", + divsufsort_version()); + fprintf(stderr, "usage: %s INFILE OUTFILE\n\n", progname); + exit(status); +} + int main(int argc, const char *argv[]) { + FILE *fp, *ofp; + const char *fname, *ofname; sauchar_t *T; - saidx_t *A, m, n, blocksize, idx; - saint_t err; + saidx_t *A; + LFS_OFF_T n; + size_t m; + saidx_t pidx; clock_t start, finish; + saint_t err, blocksize, needclose = 3; + + /* Check arguments. */ + if((argc == 1) || + (strcmp(argv[1], "-h") == 0) || + (strcmp(argv[1], "--help") == 0)) { print_help(argv[0], EXIT_SUCCESS); } + if(argc != 3) { print_help(argv[0], EXIT_FAILURE); } + + /* Open a file for reading. */ + if(strcmp(argv[1], "-") != 0) { +#if HAVE_FOPEN_S + if(fopen_s(&fp, fname = argv[1], "rb") != 0) { +#else + if((fp = LFS_FOPEN(fname = argv[1], "rb")) == NULL) { +#endif + fprintf(stderr, "%s: Cannot open file `%s': ", argv[0], fname); + perror(NULL); + exit(EXIT_FAILURE); + } + } else { +#if HAVE__SETMODE && HAVE__FILENO + if(_setmode(_fileno(stdin), _O_BINARY) == -1) { + fprintf(stderr, "%s: Cannot set mode: ", argv[0]); + perror(NULL); + exit(EXIT_FAILURE); + } +#endif + fp = stdin; + fname = "stdin"; + needclose ^= 1; + } - /* Check argument. */ - if(argc != 1) { - fprintf(stderr, - "unbwt, an inverse burrows-wheeler transform program, version %s.\n" - , divsufsort_version()); - fprintf(stderr, - "usage: %s < STDIN > STDOUT\n\n" - , argv[0]); - return 0; + /* Open a file for writing. */ + if(strcmp(argv[2], "-") != 0) { +#if HAVE_FOPEN_S + if(fopen_s(&ofp, ofname = argv[2], "wb") != 0) { +#else + if((ofp = LFS_FOPEN(ofname = argv[2], "wb")) == NULL) { +#endif + fprintf(stderr, "%s: Cannot open file `%s': ", argv[0], ofname); + perror(NULL); + exit(EXIT_FAILURE); + } + } else { +#if HAVE__SETMODE && HAVE__FILENO + if(_setmode(_fileno(stdout), _O_BINARY) == -1) { + fprintf(stderr, "%s: Cannot set mode: ", argv[0]); + perror(NULL); + exit(EXIT_FAILURE); + } +#endif + ofp = stdout; + ofname = "stdout"; + needclose ^= 2; } - /* Read the blocksize from stdin. */ - if(fread(&blocksize, sizeof(saidx_t), 1, stdin) != 1) { - fprintf(stderr, "%s: %s `stdin': ", - argv[0], - (ferror(stdin) || !feof(stdin)) ? - "Cannot read from" : "Unexpected EOF in"); + /* Read the blocksize. */ + if(read_int(fp, &blocksize) != 4) { + fprintf(stderr, "%s: Cannot read from `%s': ", argv[0], fname); perror(NULL); exit(EXIT_FAILURE); } /* Allocate 5blocksize bytes of memory. */ - if(((T = malloc(blocksize * sizeof(sauchar_t))) == NULL) || - ((A = malloc(blocksize * sizeof(saidx_t))) == NULL)) { + T = (sauchar_t *)malloc(blocksize * sizeof(sauchar_t)); + A = (saidx_t *)malloc(blocksize * sizeof(saidx_t)); + if((T == NULL) || (A == NULL)) { fprintf(stderr, "%s: Cannot allocate memory.\n", argv[0]); exit(EXIT_FAILURE); } - fprintf(stderr, "UnBWT (blocksize %d) ... ", (int)blocksize); + fprintf(stderr, "UnBWT (blocksize %" PRIdSAINT_T ") ... ", blocksize); start = clock(); - for(n = 0; fread(&idx,sizeof(saidx_t),1,stdin)!=0; n += m) { + for(n = 0; (m = read_int(fp, &pidx)) != 0; n += m) { /* Read blocksize bytes of data. */ - if((m = fread(T, sizeof(sauchar_t), blocksize, stdin)) == 0) { - fprintf(stderr, "%s: Unexpected EOF in `stdin': ", argv[0]); + if((m != 4) || ((m = fread(T, sizeof(sauchar_t), blocksize, fp)) == 0)) { + fprintf(stderr, "%s: %s `%s': ", + argv[0], + (ferror(fp) || !feof(fp)) ? "Cannot read from" : "Unexpected EOF in", + fname); perror(NULL); exit(EXIT_FAILURE); } /* Inverse Burrows-Wheeler Transform. */ - if((err = inverse_bw_transform(T, T, A, m, idx)) != 0) { - fprintf(stderr, "%s (inverse_bw_transform): %s.\n", + if((err = inverse_bw_transform(T, T, A, m, pidx)) != 0) { + fprintf(stderr, "%s (reverseBWT): %s.\n", argv[0], - (err == -1) ? "Invalid arguments" : "Cannot allocate memory"); + (err == -1) ? "Invalid data" : "Cannot allocate memory"); exit(EXIT_FAILURE); } /* Write m bytes of data. */ - if(fwrite(T, sizeof(sauchar_t), m, stdout) != m) { - fprintf(stderr, "%s: Cannot write to `stdout': ", argv[0]); + if(fwrite(T, sizeof(sauchar_t), m, ofp) != m) { + fprintf(stderr, "%s: Cannot write to `%s': ", argv[0], ofname); perror(NULL); exit(EXIT_FAILURE); } } - if(ferror(stdin)) { - fprintf(stderr, "%s: Cannot read from `stdin': ", argv[0]); + if(ferror(fp)) { + fprintf(stderr, "%s: Cannot read from `%s': ", argv[0], fname); perror(NULL); exit(EXIT_FAILURE); } finish = clock(); - fprintf(stderr, "%d bytes: %.4f sec\n", - (int)n, (double)(finish - start) / (double)CLOCKS_PER_SEC); + fprintf(stderr, "%" PRIdOFF_T " bytes: %.4f sec\n", + n, (double)(finish - start) / (double)CLOCKS_PER_SEC); + + /* Close files */ + if(needclose & 1) { fclose(fp); } + if(needclose & 2) { fclose(ofp); } /* Deallocate memory. */ - free(T); free(A); + free(T); return 0; } |