cws2fws.c 3.77 KB
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/*
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 * cws2fws by Alex Beregszaszi
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 * This file is placed in the public domain.
 * Use the program however you see fit.
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 *
 * This utility converts compressed Macromedia Flash files to uncompressed ones.
 */

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#include "config.h"
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#include <sys/stat.h>
#include <fcntl.h>
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#include <stdio.h>
#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
#if HAVE_IO_H
#include <io.h>
#endif
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#include <zlib.h>

#ifdef DEBUG
#define dbgprintf printf
#else
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#define dbgprintf(...) do { if (0) printf(__VA_ARGS__); } while (0)
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#endif

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int main(int argc, char *argv[])
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{
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    int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
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    char buf_in[1024], buf_out[65536];
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    z_stream zstream;
    struct stat statbuf;
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    int ret = 1;
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    if (argc < 3) {
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        printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
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        return 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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        perror("Error opening input file");
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        return 1;
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    }

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    fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644);
    if (fd_out < 0) {
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        perror("Error opening output file");
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        close(fd_in);
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        return 1;
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    }
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    if (read(fd_in, &buf_in, 8) != 8) {
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        printf("Header error\n");
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        goto out;
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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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        printf("Not a compressed flash file\n");
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        goto out;
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    }

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    if (fstat(fd_in, &statbuf) < 0) {
        perror("fstat failed");
        return 1;
    }
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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
    buf_in[0] = 'F';
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    if (write(fd_out, &buf_in, 8) < 8) {
        perror("Error writing output file");
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        goto out;
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    }
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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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    if (inflateInit(&zstream) != Z_OK) {
        fprintf(stderr, "inflateInit failed\n");
        return 1;
    }
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    for (i = 0; i < comp_len - 8;) {
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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];
        zstream.avail_in  = len;
        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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            printf("Error while decompressing: %d\n", ret);
            inflateEnd(&zstream);
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            goto out;
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        }
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        dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
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                  zstream.avail_in, zstream.total_in, zstream.avail_out,
                  zstream.total_out, zstream.total_out - last_out);
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        if (write(fd_out, &buf_out, zstream.total_out - last_out) <
            zstream.total_out - last_out) {
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            perror("Error writing output file");
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            inflateEnd(&zstream);
            goto out;
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        }
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        i += len;
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        if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
            break;
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    }
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    if (zstream.total_out != uncomp_len - 8) {
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        printf("Size mismatch (%lu != %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;
        buf_in[1] = ((zstream.total_out + 8) >>  8) & 0xff;
        buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff;
        buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff;
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        if (   lseek(fd_out, 4, SEEK_SET) < 0
            || write(fd_out, &buf_in, 4) < 4) {
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            perror("Error writing output file");
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            inflateEnd(&zstream);
            goto out;
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        }
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    }
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    ret = 0;
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    inflateEnd(&zstream);
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out:
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    close(fd_in);
    close(fd_out);
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    return ret;
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}