| 1 | /* |
| 2 | * cws2fws by Alex Beregszaszi |
| 3 | * This file is placed in the public domain. |
| 4 | * Use the program however you see fit. |
| 5 | * |
| 6 | * This utility converts compressed Macromedia Flash files to uncompressed ones. |
| 7 | */ |
| 8 | |
| 9 | #include "config.h" |
| 10 | #include <sys/stat.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #if HAVE_UNISTD_H |
| 15 | #include <unistd.h> |
| 16 | #endif |
| 17 | #if HAVE_IO_H |
| 18 | #include <io.h> |
| 19 | #endif |
| 20 | #include <zlib.h> |
| 21 | |
| 22 | #ifdef DEBUG |
| 23 | #define dbgprintf printf |
| 24 | #else |
| 25 | #define dbgprintf(...) |
| 26 | #endif |
| 27 | |
| 28 | int main(int argc, char *argv[]) |
| 29 | { |
| 30 | int fd_in, fd_out, comp_len, uncomp_len, i, last_out; |
| 31 | char buf_in[1024], buf_out[65536]; |
| 32 | z_stream zstream; |
| 33 | struct stat statbuf; |
| 34 | |
| 35 | if (argc < 3) { |
| 36 | printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]); |
| 37 | return 1; |
| 38 | } |
| 39 | |
| 40 | fd_in = open(argv[1], O_RDONLY); |
| 41 | if (fd_in < 0) { |
| 42 | perror("Error opening input file"); |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644); |
| 47 | if (fd_out < 0) { |
| 48 | perror("Error opening output file"); |
| 49 | close(fd_in); |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | if (read(fd_in, &buf_in, 8) != 8) { |
| 54 | printf("Header error\n"); |
| 55 | close(fd_in); |
| 56 | close(fd_out); |
| 57 | return 1; |
| 58 | } |
| 59 | |
| 60 | if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S') { |
| 61 | printf("Not a compressed flash file\n"); |
| 62 | return 1; |
| 63 | } |
| 64 | |
| 65 | if (fstat(fd_in, &statbuf) < 0) { |
| 66 | perror("fstat failed"); |
| 67 | return 1; |
| 68 | } |
| 69 | comp_len = statbuf.st_size; |
| 70 | uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24); |
| 71 | |
| 72 | printf("Compressed size: %d Uncompressed size: %d\n", |
| 73 | comp_len - 4, uncomp_len - 4); |
| 74 | |
| 75 | // write out modified header |
| 76 | buf_in[0] = 'F'; |
| 77 | if (write(fd_out, &buf_in, 8) < 8) { |
| 78 | perror("Error writing output file"); |
| 79 | return 1; |
| 80 | } |
| 81 | |
| 82 | zstream.zalloc = NULL; |
| 83 | zstream.zfree = NULL; |
| 84 | zstream.opaque = NULL; |
| 85 | if (inflateInit(&zstream) != Z_OK) { |
| 86 | fprintf(stderr, "inflateInit failed\n"); |
| 87 | return 1; |
| 88 | } |
| 89 | |
| 90 | for (i = 0; i < comp_len - 8;) { |
| 91 | int ret, len = read(fd_in, &buf_in, 1024); |
| 92 | |
| 93 | dbgprintf("read %d bytes\n", len); |
| 94 | |
| 95 | last_out = zstream.total_out; |
| 96 | |
| 97 | zstream.next_in = &buf_in[0]; |
| 98 | zstream.avail_in = len; |
| 99 | zstream.next_out = &buf_out[0]; |
| 100 | zstream.avail_out = 65536; |
| 101 | |
| 102 | ret = inflate(&zstream, Z_SYNC_FLUSH); |
| 103 | if (ret != Z_STREAM_END && ret != Z_OK) { |
| 104 | printf("Error while decompressing: %d\n", ret); |
| 105 | inflateEnd(&zstream); |
| 106 | return 1; |
| 107 | } |
| 108 | |
| 109 | dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n", |
| 110 | zstream.avail_in, zstream.total_in, zstream.avail_out, |
| 111 | zstream.total_out, zstream.total_out - last_out); |
| 112 | |
| 113 | if (write(fd_out, &buf_out, zstream.total_out - last_out) < |
| 114 | zstream.total_out - last_out) { |
| 115 | perror("Error writing output file"); |
| 116 | return 1; |
| 117 | } |
| 118 | |
| 119 | i += len; |
| 120 | |
| 121 | if (ret == Z_STREAM_END || ret == Z_BUF_ERROR) |
| 122 | break; |
| 123 | } |
| 124 | |
| 125 | if (zstream.total_out != uncomp_len - 8) { |
| 126 | printf("Size mismatch (%lu != %d), updating header...\n", |
| 127 | zstream.total_out, uncomp_len - 8); |
| 128 | |
| 129 | buf_in[0] = (zstream.total_out + 8) & 0xff; |
| 130 | buf_in[1] = ((zstream.total_out + 8) >> 8) & 0xff; |
| 131 | buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff; |
| 132 | buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff; |
| 133 | |
| 134 | if ( lseek(fd_out, 4, SEEK_SET) < 0 |
| 135 | || write(fd_out, &buf_in, 4) < 4) { |
| 136 | perror("Error writing output file"); |
| 137 | return 1; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | inflateEnd(&zstream); |
| 142 | close(fd_in); |
| 143 | close(fd_out); |
| 144 | return 0; |
| 145 | } |