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 28int 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} 146