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