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https://github.com/FFmpeg/FFmpeg.git
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128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
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* cws2fws by Alex Beregszaszi
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* Public domain.
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*
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* This utility converts compressed Macromedia Flash files to uncompressed ones.
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*
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*/
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <zlib.h>
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#ifdef DEBUG
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#define dbgprintf printf
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#else
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#define dbgprintf
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#endif
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main(int argc, char *argv[])
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{
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int fd_in, fd_out, comp_len, uncomp_len, tag, i, last_out;
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char buf_in[1024], buf_out[65536];
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z_stream zstream;
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struct stat statbuf;
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if (argc < 3)
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{
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printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
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exit(1);
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}
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fd_in = open(argv[1], O_RDONLY);
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if (fd_in < 0)
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{
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perror("Error while opening: ");
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exit(1);
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}
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fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
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if (fd_out < 0)
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{
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perror("Error while opening: ");
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close(fd_in);
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exit(1);
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}
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if (read(fd_in, &buf_in, 8) != 8)
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{
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printf("Header error\n");
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close(fd_in);
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close(fd_out);
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exit(1);
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}
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if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
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{
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printf("Not a compressed flash file\n");
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exit(1);
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}
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fstat(fd_in, &statbuf);
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comp_len = statbuf.st_size;
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uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
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printf("Compressed size: %d Uncompressed size: %d\n", comp_len-4, uncomp_len-4);
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// write out modified header
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buf_in[0] = 'F';
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write(fd_out, &buf_in, 8);
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zstream.zalloc = NULL;
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zstream.zfree = NULL;
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zstream.opaque = NULL;
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inflateInit(&zstream);
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for (i = 0; i < comp_len-8;)
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{
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int ret, len = read(fd_in, &buf_in, 1024);
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dbgprintf("read %d bytes\n", len);
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last_out = zstream.total_out;
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zstream.next_in = &buf_in[0];
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zstream.avail_in = len;
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zstream.next_out = &buf_out[0];
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zstream.avail_out = 65536;
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ret = inflate(&zstream, Z_SYNC_FLUSH);
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if (ret != Z_STREAM_END && ret != Z_OK)
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{
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printf("Error while decompressing: %d\n", ret);
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inflateEnd(&zstream);
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exit(1);
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}
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dbgprintf("a_in: %d t_in: %d a_out: %d t_out: %d -- %d out\n",
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zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
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zstream.total_out-last_out);
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write(fd_out, &buf_out, zstream.total_out-last_out);
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i += len;
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if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
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break;
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}
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if (zstream.total_out != uncomp_len-8)
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{
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printf("Size mismatch (%d != %d), updating header...\n",
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zstream.total_out, uncomp_len-8);
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buf_in[0] = (zstream.total_out+8) & 0xff;
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buf_in[1] = (zstream.total_out+8 >> 8) & 0xff;
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buf_in[2] = (zstream.total_out+8 >> 16) & 0xff;
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buf_in[3] = (zstream.total_out+8 >> 24) & 0xff;
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lseek(fd_out, 4, SEEK_SET);
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write(fd_out, &buf_in, 4);
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}
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inflateEnd(&zstream);
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close(fd_in);
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close(fd_out);
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}
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