| /* minideflate.c -- test deflate/inflate under specific conditions |
| * Copyright (C) 2020 Nathan Moinvaziri |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| #include <stdio.h> |
| #include <assert.h> |
| |
| #include "zbuild.h" |
| #include "zutil.h" |
| |
| #if defined(_WIN32) || defined(__CYGWIN__) |
| # include <fcntl.h> |
| # include <io.h> |
| # include <string.h> |
| # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
| # ifdef _MSC_VER |
| # define strcasecmp _stricmp |
| # endif |
| #else |
| # include <strings.h> |
| # define SET_BINARY_MODE(file) |
| #endif |
| |
| #define CHECK_ERR(err, msg) { \ |
| if (err != Z_OK) { \ |
| fprintf(stderr, "%s error: %d\n", msg, err); \ |
| exit(1); \ |
| } \ |
| } |
| |
| /* Default read/write i/o buffer size based on GZBUFSIZE */ |
| #define BUFSIZE 131072 |
| |
| /* =========================================================================== |
| * deflate() using specialized parameters |
| */ |
| void deflate_params(FILE *fin, FILE *fout, int32_t read_buf_size, int32_t write_buf_size, int32_t level, |
| int32_t window_bits, int32_t mem_level, int32_t strategy, int32_t flush) { |
| PREFIX3(stream) c_stream; /* compression stream */ |
| uint8_t *read_buf; |
| uint8_t *write_buf; |
| int32_t read; |
| int err; |
| |
| read_buf = (uint8_t *)malloc(read_buf_size); |
| if (read_buf == NULL) { |
| fprintf(stderr, "failed to create read buffer (%d)\n", read_buf_size); |
| return; |
| } |
| write_buf = (uint8_t *)malloc(write_buf_size); |
| if (write_buf == NULL) { |
| fprintf(stderr, "failed to create write buffer (%d)\n", write_buf_size); |
| free(read_buf); |
| return; |
| } |
| |
| c_stream.zalloc = NULL; |
| c_stream.zfree = NULL; |
| c_stream.opaque = (void *)0; |
| c_stream.total_in = 0; |
| c_stream.total_out = 0; |
| c_stream.next_out = write_buf; |
| c_stream.avail_out = write_buf_size; |
| |
| err = PREFIX(deflateInit2)(&c_stream, level, Z_DEFLATED, window_bits, mem_level, strategy); |
| CHECK_ERR(err, "deflateInit2"); |
| |
| /* Process input using our read buffer and flush type, |
| * output to stdout only once write buffer is full */ |
| do { |
| read = (int32_t)fread(read_buf, 1, read_buf_size, fin); |
| if (read <= 0) |
| break; |
| |
| c_stream.next_in = (z_const uint8_t *)read_buf; |
| c_stream.avail_in = read; |
| |
| do { |
| err = PREFIX(deflate)(&c_stream, flush); |
| if (err == Z_STREAM_END) break; |
| CHECK_ERR(err, "deflate"); |
| |
| if (c_stream.next_out == write_buf + write_buf_size) { |
| fwrite(write_buf, 1, write_buf_size, fout); |
| c_stream.next_out = write_buf; |
| c_stream.avail_out = write_buf_size; |
| } |
| } while (c_stream.next_in < read_buf + read); |
| } while (err == Z_OK); |
| |
| /* Finish the stream if necessary */ |
| if (flush != Z_FINISH) { |
| c_stream.avail_in = 0; |
| do { |
| if (c_stream.next_out == write_buf + write_buf_size) { |
| fwrite(write_buf, 1, write_buf_size, fout); |
| c_stream.next_out = write_buf; |
| c_stream.avail_out = write_buf_size; |
| } |
| |
| err = PREFIX(deflate)(&c_stream, Z_FINISH); |
| if (err == Z_STREAM_END) break; |
| CHECK_ERR(err, "deflate"); |
| } while (1); |
| } |
| |
| /* Output remaining data in write buffer */ |
| if (c_stream.next_out != write_buf) { |
| fwrite(write_buf, 1, c_stream.next_out - write_buf, fout); |
| } |
| |
| err = PREFIX(deflateEnd)(&c_stream); |
| CHECK_ERR(err, "deflateEnd"); |
| |
| free(read_buf); |
| free(write_buf); |
| } |
| |
| /* =========================================================================== |
| * inflate() using specialized parameters |
| */ |
| void inflate_params(FILE *fin, FILE *fout, int32_t read_buf_size, int32_t write_buf_size, int32_t window_bits, |
| int32_t flush) { |
| PREFIX3(stream) d_stream; /* decompression stream */ |
| uint8_t *read_buf; |
| uint8_t *write_buf; |
| int32_t read; |
| int err; |
| |
| |
| read_buf = (uint8_t *)malloc(read_buf_size); |
| if (read_buf == NULL) { |
| fprintf(stderr, "failed to create read buffer (%d)\n", read_buf_size); |
| return; |
| } |
| write_buf = (uint8_t *)malloc(write_buf_size); |
| if (write_buf == NULL) { |
| fprintf(stderr, "failed to create write buffer (%d)\n", write_buf_size); |
| free(read_buf); |
| return; |
| } |
| |
| d_stream.zalloc = NULL; |
| d_stream.zfree = NULL; |
| d_stream.opaque = (void *)0; |
| d_stream.total_in = 0; |
| d_stream.total_out = 0; |
| d_stream.next_out = write_buf; |
| d_stream.avail_out = write_buf_size; |
| |
| err = PREFIX(inflateInit2)(&d_stream, window_bits); |
| CHECK_ERR(err, "inflateInit2"); |
| |
| /* Process input using our read buffer and flush type, |
| * output to stdout only once write buffer is full */ |
| do { |
| read = (int32_t)fread(read_buf, 1, read_buf_size, fin); |
| if (read <= 0) |
| break; |
| |
| d_stream.next_in = (z_const uint8_t *)read_buf; |
| d_stream.avail_in = read; |
| |
| do { |
| err = PREFIX(inflate)(&d_stream, flush); |
| if (err == Z_STREAM_END) break; |
| CHECK_ERR(err, "inflate"); |
| |
| if (d_stream.next_out == write_buf + write_buf_size) { |
| fwrite(write_buf, 1, write_buf_size, fout); |
| d_stream.next_out = write_buf; |
| d_stream.avail_out = write_buf_size; |
| } |
| } while (d_stream.next_in < read_buf + read); |
| } while (err == Z_OK); |
| |
| /* Finish the stream if necessary */ |
| if (flush != Z_FINISH) { |
| d_stream.avail_in = 0; |
| do { |
| if (d_stream.next_out == write_buf + write_buf_size) { |
| fwrite(write_buf, 1, write_buf_size, fout); |
| d_stream.next_out = write_buf; |
| d_stream.avail_out = write_buf_size; |
| } |
| |
| err = PREFIX(inflate)(&d_stream, Z_FINISH); |
| if (err == Z_STREAM_END) break; |
| CHECK_ERR(err, "inflate"); |
| } while (1); |
| } |
| |
| /* Output remaining data in write buffer */ |
| if (d_stream.next_out != write_buf) { |
| fwrite(write_buf, 1, d_stream.next_out - write_buf, fout); |
| } |
| |
| err = PREFIX(inflateEnd)(&d_stream); |
| CHECK_ERR(err, "inflateEnd"); |
| |
| free(read_buf); |
| free(write_buf); |
| } |
| |
| void show_help(void) { |
| printf("Usage: minideflate [-c][-d][-k] [-f|-h|-R|-F] [-m level] [-r/-t size] [-s flush] [-w bits] [-0 to -9] [input file]\n\n" \ |
| " -c : write to standard output\n" \ |
| " -d : decompress\n" \ |
| " -k : keep input file\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" \ |
| " -m : memory level (1 to 8)\n" \ |
| " -w : window bits..\n" \ |
| " : -1 to -15 for raw deflate\n" |
| " : 0 to 15 for deflate (adler32)\n" |
| " : 16 to 31 for gzip (crc32)\n" |
| " -s : flush type (0 to 5)\n" \ |
| " -r : read buffer size\n" \ |
| " -t : write buffer size\n" \ |
| " -0 to -9 : compression level\n\n"); |
| } |
| |
| int main(int argc, char **argv) { |
| int32_t i; |
| int32_t mem_level = DEF_MEM_LEVEL; |
| int32_t window_bits = INT32_MAX; |
| int32_t strategy = Z_DEFAULT_STRATEGY; |
| int32_t level = Z_DEFAULT_COMPRESSION; |
| int32_t read_buf_size = BUFSIZE; |
| int32_t write_buf_size = BUFSIZE; |
| int32_t flush = Z_NO_FLUSH; |
| uint8_t copyout = 0; |
| uint8_t uncompr = 0; |
| uint8_t keep = 0; |
| FILE *fin = stdin; |
| FILE *fout = stdout; |
| |
| |
| if (argc == 1) { |
| show_help(); |
| return 64; /* EX_USAGE */ |
| } |
| |
| for (i = 1; i < argc; i++) { |
| if ((strcmp(argv[i], "-m") == 0) && (i + 1 < argc)) |
| mem_level = atoi(argv[++i]); |
| else if ((strcmp(argv[i], "-w") == 0) && (i + 1 < argc)) |
| window_bits = atoi(argv[++i]); |
| else if ((strcmp(argv[i], "-r") == 0) && (i + 1 < argc)) |
| read_buf_size = atoi(argv[++i]); |
| else if ((strcmp(argv[i], "-t") == 0) && (i + 1 < argc)) |
| write_buf_size = atoi(argv[++i]); |
| else if ((strcmp(argv[i], "-s") == 0) && (i + 1 < argc)) |
| flush = atoi(argv[++i]); |
| else 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], "-f") == 0) |
| strategy = Z_FILTERED; |
| else if (strcmp(argv[i], "-F") == 0) |
| strategy = Z_FIXED; |
| else if (strcmp(argv[i], "-h") == 0) |
| strategy = Z_HUFFMAN_ONLY; |
| else if (strcmp(argv[i], "-R") == 0) |
| strategy = Z_RLE; |
| else if (argv[i][0] == '-' && argv[i][1] >= '0' && argv[i][1] <= '9' && argv[i][2] == 0) |
| level = argv[i][1] - '0'; |
| else if (strcmp(argv[i], "--help") == 0) { |
| show_help(); |
| return 0; |
| } else if (argv[i][0] == '-') { |
| show_help(); |
| return 64; /* EX_USAGE */ |
| } else |
| break; |
| } |
| |
| SET_BINARY_MODE(stdin); |
| SET_BINARY_MODE(stdout); |
| |
| if (i != argc) { |
| fin = fopen(argv[i], "rb+"); |
| if (fin == NULL) { |
| fprintf(stderr, "Failed to open file: %s\n", argv[i]); |
| exit(1); |
| } |
| if (!copyout) { |
| char *out_file = (char *)calloc(1, strlen(argv[i]) + 6); |
| if (out_file == NULL) { |
| fprintf(stderr, "Not enough memory\n"); |
| exit(1); |
| } |
| strcat(out_file, argv[i]); |
| if (!uncompr) { |
| if (window_bits < 0) { |
| strcat(out_file, ".zraw"); |
| } else if (window_bits > MAX_WBITS) { |
| strcat(out_file, ".gz"); |
| } else { |
| strcat(out_file, ".z"); |
| } |
| } else { |
| char *out_ext = strrchr(out_file, '.'); |
| if (out_ext != NULL) { |
| if (strcasecmp(out_ext, ".zraw") == 0 && window_bits == INT32_MAX) { |
| fprintf(stderr, "Must specify window bits for raw deflate stream\n"); |
| exit(1); |
| } |
| *out_ext = 0; |
| } |
| } |
| fout = fopen(out_file, "wb"); |
| if (fout == NULL) { |
| fprintf(stderr, "Failed to open file: %s\n", out_file); |
| exit(1); |
| } |
| free(out_file); |
| } |
| } |
| |
| if (window_bits == INT32_MAX) { |
| window_bits = MAX_WBITS; |
| /* Auto-detect wrapper for inflateInit */ |
| if (uncompr) |
| window_bits += 32; |
| } |
| |
| if (window_bits == INT32_MAX) { |
| window_bits = MAX_WBITS; |
| /* Auto-detect wrapper for inflateInit */ |
| if (uncompr) |
| window_bits += 32; |
| } |
| |
| if (uncompr) { |
| inflate_params(fin, fout, read_buf_size, write_buf_size, window_bits, flush); |
| } else { |
| deflate_params(fin, fout, read_buf_size, write_buf_size, level, window_bits, mem_level, strategy, flush); |
| } |
| |
| if (fin != stdin) { |
| fclose(fin); |
| if (!copyout && !keep) { |
| unlink(argv[i]); |
| } |
| } |
| if (fout != stdout) { |
| fclose(fout); |
| } |
| |
| return 0; |
| } |
