Jpeg2KToolCommon.cpp

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int  jbxl::isJPEG2KHeader(Buffer buf)
{
    int format = JP2K_FMT_NONE;
 
    if (!memcmp(buf.buf, JP2K_MAGIC_RFC3745_JP2, 12) || !memcmp(buf.buf, JP2K_MAGIC_JP2, 4)) {
        format = JP2K_FMT_JP2;
    }
    else if (!memcmp(buf.buf, JP2K_MAGIC_J2K, 4)) {
        format = JP2K_FMT_J2K;
    }
    return format;
}
 
 
int  jbxl::repairJPEG2KFile(const char* fname, const char* writef)
{
    if (fname==NULL || writef==NULL) return JBXL_GRAPH_IVDARG_ERROR;
    int c_flag = FALSE;
 
    // read file
    Buffer buf = read_Buffer_file(fname);
    if (buf.vldsz<=0) return JBXL_GRAPH_RDFILE_ERROR;
 
    // EOC (ffd9)
    unsigned char eoc[] = {0xff, 0xd9};
    if (buf.buf[buf.vldsz-2]!=eoc[0] || buf.buf[buf.vldsz-1]!=eoc[1]) {
        cat_b2Buffer(eoc, &buf, 2);
        c_flag = TRUE;
    }
 
    // Title Part (ff90)
    for (int i=0; i<buf.vldsz-1; i++) {
        if (buf.buf[i]==0xff && buf.buf[i+1]==0x90) {
            if (i+9<buf.vldsz) {
                buf.buf[i+6] = 0x00;                    // Lost: 0 でOK
                buf.buf[i+7] = 0x00;
                buf.buf[i+8] = 0x00;
                buf.buf[i+9] = 0x00;
                c_flag = TRUE;
                break;
            }
        }
    }
 
    // write file
    int ret = JBXL_GRAPH_IVDDATA_ERROR;
    if (c_flag) {
        ret = JBXL_NORMAL;
        int sbf = save_Buffer_file(buf, (char*)writef);
        if (!sbf) ret = JBXL_GRAPH_WRFILE_ERROR;
    }
    free_Buffer(&buf);
 
    return ret;
}