BLF: Support for BLF file format

This patch adds first support for the BLF file format.

1 files changed, 1567 insertions, 0 deletions

diff --git a/wiretap/blf.c b/wiretap/blf.c
new file mode 100644
index 0000000000..8f0d3a92cd
--- /dev/null
+++ b/wiretap/blf.c
@@ -0,0 +1,1567 @@
+/* blf.c
+ *
+ * Wiretap Library
+ * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * File format support for blf file format
+ * Copyright (c) 2021 by Dr. Lars Voelker <lars.voelker@technica-engineering.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+ /*
+  * The following was used as a reference for the file format:
+  *     https://bitbucket.org/tobylorenz/vector_blf
+  * The repo above includes multiple examples files as well.
+  */
+
+#include <config.h>
+#include "blf.h"
+
+#include <epan/dissectors/packet-socketcan.h>
+#include <string.h>
+#include <wsutil/wslog.h>
+#include "file_wrappers.h"
+#include "wtap-int.h"
+
+#ifdef HAVE_ZLIB
+#define ZLIB_CONST
+#include <zlib.h>
+#endif /* HAVE_ZLIB */
+
+static const guint8 blf_magic[] = { 'L', 'O', 'G', 'G' };
+static const guint8 blf_obj_magic[] = { 'L', 'O', 'B', 'J' };
+
+static int blf_file_type_subtype = -1;
+
+void register_blf(void);
+
+static gboolean blf_read(wtap *wth, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info, gint64 *data_offset);
+static gboolean blf_seek_read(wtap *wth, gint64 seek_off, wtap_rec* rec, Buffer *buf, int *err, gchar **err_info);
+static void blf_close(wtap *wth);
+
+/*
+ * The virtual buffer looks like this (skips all headers):
+ * uncompressed log container data
+ * uncompressed log container data
+ * ...
+ *
+ * The "real" positions, length, etc. reference this layout and not the file.
+ * When no compression is used the file is accessed directly.
+ */
+
+typedef struct blf_log_container {
+    gint64   infile_start_pos;        /* start position of log container in file */
+    guint64  infile_length;           /* length of log container in file */
+    guint64  infile_data_start;       /* start position of data in log container in file */
+
+    gint64   real_start_pos;          /* decompressed (virtual) start position including header */
+    guint64  real_length;             /* decompressed length */
+    gint64   real_first_object_pos;   /* where does the first obj start? */
+    guint64  real_leftover_bytes;     /* how many bytes are left over for the next container? */
+
+    guint16  compression_method;      /* 0: uncompressed, 2: zlib */
+
+    unsigned char  *real_data;        /* cache for decompressed data */
+} blf_log_container_t;
+
+typedef struct blf_data {
+    gint64  start_of_last_obj;
+    gint64  current_real_seek_pos;
+
+    guint   current_log_container;
+    GArray *log_containers;
+} blf_t;
+
+typedef struct blf_params {
+    wtap     *wth;
+    wtap_rec *rec;
+    Buffer   *buf;
+    FILE_T    fh;
+
+    blf_t    *blf_data;
+} blf_params_t;
+
+gboolean blf_read_block(blf_params_t *params, gint64 start_pos, int *err, gchar **err_info);
+
+void
+fix_endianness_blf_date(blf_date_t *date) {
+    date->year = GUINT16_FROM_LE(date->year);
+    date->month = GUINT16_FROM_LE(date->month);
+    date->dayofweek = GUINT16_FROM_LE(date->dayofweek);
+    date->day = GUINT16_FROM_LE(date->day);
+    date->hour = GUINT16_FROM_LE(date->hour);
+    date->mins = GUINT16_FROM_LE(date->mins);
+    date->sec = GUINT16_FROM_LE(date->sec);
+    date->ms = GUINT16_FROM_LE(date->ms);
+}
+
+void
+fix_endianness_blf_fileheader(blf_fileheader_t *header) {
+    header->header_length = GUINT32_FROM_LE(header->header_length);
+    header->len_compressed = GUINT64_FROM_LE(header->len_compressed);
+    header->len_uncompressed = GUINT64_FROM_LE(header->len_uncompressed);
+    header->obj_count = GUINT32_FROM_LE(header->obj_count);
+    header->obj_read = GUINT32_FROM_LE(header->obj_read);
+    fix_endianness_blf_date(&(header->start_date));
+    fix_endianness_blf_date(&(header->end_date));
+    header->length3 = GUINT32_FROM_LE(header->length3);
+}
+
+void
+fix_endianness_blf_blockheader(blf_blockheader_t *header) {
+    header->header_length = GUINT16_FROM_LE(header->header_length);
+    header->header_type = GUINT16_FROM_LE(header->header_type);
+    header->object_length = GUINT32_FROM_LE(header->object_length);
+    header->object_type = GUINT32_FROM_LE(header->object_type);
+}
+
+void
+fix_endianness_blf_logcontainerheader(blf_logcontainerheader_t *header) {
+    header->compression_method = GUINT16_FROM_LE(header->compression_method);
+    header->res1 = GUINT16_FROM_LE(header->res1);
+    header->res2 = GUINT32_FROM_LE(header->res2);
+    header->uncompressed_size = GUINT32_FROM_LE(header->uncompressed_size);
+    header->res4 = GUINT32_FROM_LE(header->res4);
+}
+
+void
+fix_endianness_blf_logobjectheader(blf_logobjectheader_t *header) {
+    header->flags = GUINT32_FROM_LE(header->flags);
+    header->client_index = GUINT16_FROM_LE(header->client_index);
+    header->object_version = GUINT16_FROM_LE(header->object_version);
+    header->object_timestamp = GUINT64_FROM_LE(header->object_timestamp);
+}
+
+void
+fix_endianness_blf_ethernetframeheader(blf_ethernetframeheader_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->direction = GUINT16_FROM_LE(header->direction);
+    header->ethtype = GUINT16_FROM_LE(header->ethtype);
+    header->tpid = GUINT16_FROM_LE(header->tpid);
+    header->tci = GUINT16_FROM_LE(header->tci);
+    header->payloadlength = GUINT16_FROM_LE(header->payloadlength);
+}
+
+void
+fix_endianness_blf_ethernetframeheader_ex(blf_ethernetframeheader_ex_t *header) {
+    header->struct_length = GUINT16_FROM_LE(header->struct_length);
+    header->flags = GUINT16_FROM_LE(header->flags);
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->hw_channel = GUINT16_FROM_LE(header->hw_channel);
+    header->frame_duration = GUINT64_FROM_LE(header->frame_duration);
+    header->frame_checksum = GUINT32_FROM_LE(header->frame_checksum);
+    header->direction = GUINT16_FROM_LE(header->direction);
+    header->frame_length = GUINT16_FROM_LE(header->frame_length);
+    header->frame_handle = GUINT32_FROM_LE(header->frame_handle);
+    header->error = GUINT32_FROM_LE(header->error);
+}
+
+void
+fix_endianness_blf_canmessage(blf_canmessage_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->id = GUINT32_FROM_LE(header->id);
+}
+
+void
+fix_endianness_blf_canmessage2_trailer(blf_canmessage2_trailer_t *header) {
+    header->frameLength_in_ns = GUINT32_FROM_LE(header->frameLength_in_ns);
+    header->reserved2 = GUINT16_FROM_LE(header->reserved1);
+}
+
+void
+fix_endianness_blf_canfdmessage(blf_canfdmessage_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->id = GUINT32_FROM_LE(header->id);
+    header->frameLength_in_ns = GUINT32_FROM_LE(header->frameLength_in_ns);
+    header->reservedCanFdMessage2 = GUINT32_FROM_LE(header->reservedCanFdMessage2);
+}
+
+void
+fix_endianness_blf_canfdmessage64(blf_canfdmessage64_t *header) {
+    header->id = GUINT32_FROM_LE(header->id);
+    header->frameLength_in_ns = GUINT32_FROM_LE(header->frameLength_in_ns);
+    header->flags = GUINT32_FROM_LE(header->flags);
+    header->btrCfgArb = GUINT32_FROM_LE(header->btrCfgArb);
+    header->btrCfgData = GUINT32_FROM_LE(header->btrCfgData);
+    header->timeOffsetBrsNs = GUINT32_FROM_LE(header->timeOffsetBrsNs);
+    header->timeOffsetCrcDelNs = GUINT32_FROM_LE(header->timeOffsetCrcDelNs);
+    header->bitCount = GUINT16_FROM_LE(header->bitCount);
+    header->crc = GUINT32_FROM_LE(header->crc);
+}
+
+void
+fix_endianness_blf_flexraydata(blf_flexraydata_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->messageId = GUINT16_FROM_LE(header->messageId);
+    header->crc = GUINT16_FROM_LE(header->crc);
+    header->reservedFlexRayData2 = GUINT16_FROM_LE(header->reservedFlexRayData2);
+}
+
+void
+fix_endianness_blf_flexraymessage(blf_flexraymessage_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->fpgaTick = GUINT32_FROM_LE(header->fpgaTick);
+    header->fpgaTickOverflow = GUINT32_FROM_LE(header->fpgaTickOverflow);
+    header->clientIndexFlexRayV6Message = GUINT32_FROM_LE(header->clientIndexFlexRayV6Message);
+    header->clusterTime = GUINT32_FROM_LE(header->clusterTime);
+    header->frameId = GUINT16_FROM_LE(header->frameId);
+    header->headerCrc = GUINT16_FROM_LE(header->headerCrc);
+    header->frameState = GUINT16_FROM_LE(header->frameState);
+    header->reservedFlexRayV6Message2 = GUINT16_FROM_LE(header->reservedFlexRayV6Message2);
+}
+
+void
+fix_endianness_blf_flexrayrcvmessage(blf_flexrayrcvmessage_t *header) {
+    header->channel = GUINT16_FROM_LE(header->channel);
+    header->version = GUINT16_FROM_LE(header->version);
+    header->channelMask = GUINT16_FROM_LE(header->channelMask);
+    header->dir = GUINT16_FROM_LE(header->dir);
+    header->clientIndex = GUINT32_FROM_LE(header->clientIndex);
+    header->clusterNo = GUINT32_FROM_LE(header->clusterNo);
+    header->frameId = GUINT16_FROM_LE(header->frameId);
+    header->headerCrc1 = GUINT16_FROM_LE(header->headerCrc1);
+    header->headerCrc2 = GUINT16_FROM_LE(header->headerCrc2);
+    header->payloadLength = GUINT16_FROM_LE(header->payloadLength);
+    header->payloadLengthValid = GUINT16_FROM_LE(header->payloadLengthValid);
+    header->cycle = GUINT16_FROM_LE(header->cycle);
+    header->tag = GUINT32_FROM_LE(header->tag);
+    header->data = GUINT32_FROM_LE(header->data);
+    header->frameFlags = GUINT32_FROM_LE(header->frameFlags);
+    header->appParameter = GUINT32_FROM_LE(header->appParameter);
+/*  this would be extra for ext format:
+    header->frameCRC = GUINT32_FROM_LE(header->frameCRC);
+    header->frameLengthInNs = GUINT32_FROM_LE(header->frameLengthInNs);
+    header->frameId1 = GUINT16_FROM_LE(header->frameId1);
+    header->pduOffset = GUINT16_FROM_LE(header->pduOffset);
+    header->blfLogMask = GUINT16_FROM_LE(header->blfLogMask);
+*/
+}
+
+guint64
+blf_timestamp_to_ns(blf_logobjectheader_t *header) {
+    switch (header->flags) {
+    case BLF_TIMESTAMP_RESOLUTION_10US:
+        return 10000 * header->object_timestamp;
+        break;
+
+    case BLF_TIMESTAMP_RESOLUTION_1NS:
+        return header->object_timestamp;
+        break;
+
+    default:
+        ws_debug("i dont understand the flags 0x%x", header->flags);
+        return 0;
+        break;
+    }
+}
+
+void
+blf_init_logcontainer(blf_log_container_t *tmp) {
+    tmp->infile_start_pos = 0;
+    tmp->infile_length = 0;
+    tmp->infile_data_start = 0;
+    tmp->real_start_pos = 0;
+    tmp->real_length = 0;
+    tmp->real_first_object_pos = -1;
+    tmp->real_leftover_bytes = G_MAXUINT64;
+    tmp->real_data = NULL;
+    tmp->compression_method = 0;
+}
+
+void
+blf_add_logcontainer(blf_t *blf_data, blf_log_container_t log_container) {
+    if (blf_data->log_containers == NULL) {
+        blf_data->log_containers = g_array_sized_new(FALSE, FALSE, sizeof(blf_log_container_t), 1);
+        blf_data->current_log_container = 0;
+    } else {
+        blf_data->current_log_container++;
+    }
+
+    g_array_append_val(blf_data->log_containers, log_container);
+}
+
+gboolean
+blf_get_logcontainer_by_index(blf_t *blf_data, guint index, blf_log_container_t **ret) {
+    if (blf_data == NULL || blf_data->log_containers == NULL || index >= blf_data->log_containers->len) {
+        return FALSE;
+    }
+
+    *ret = &g_array_index(blf_data->log_containers, blf_log_container_t, index);
+    return TRUE;
+}
+
+gboolean
+blf_get_current_logcontainer(blf_t *blf_data, blf_log_container_t **ret) {
+    return blf_get_logcontainer_by_index(blf_data, blf_data->current_log_container, ret);
+}
+
+gint
+blf_number_of_logcontainers(blf_t *blf_data) {
+    if (blf_data == NULL) {
+        return -1;
+    }
+    if (blf_data->log_containers == NULL) {
+        return 0;
+    }
+    return (gint)blf_data->log_containers->len;
+}
+
+guint64
+blf_get_num_prev_leftover_bytes(blf_t *blf_data) {
+    if (blf_data->current_log_container == 0) {
+        return 0;
+    } else {
+        blf_log_container_t tmp = g_array_index(blf_data->log_containers, blf_log_container_t, blf_data->current_log_container-1);
+        return tmp.real_leftover_bytes;
+    }
+}
+
+gboolean
+blf_find_logcontainer_for_address(blf_t *blf_data, gint64 pos, blf_log_container_t **container, gint *container_index) {
+    blf_log_container_t *tmp;
+
+    if (blf_data == NULL || blf_data->log_containers == NULL) {
+        return FALSE;
+    }
+
+    for (guint i = 0; i < blf_data->log_containers->len; i++) {
+        tmp = &g_array_index(blf_data->log_containers, blf_log_container_t, i);
+        if (tmp->real_start_pos <= pos && pos < tmp->real_start_pos + (gint64)tmp->real_length) {
+            *container = tmp;
+            *container_index = i;
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+gboolean
+blf_pull_logcontainer_into_memory(blf_params_t *params, guint index_log_container) {
+    blf_t *blf_data = params->blf_data;
+    blf_log_container_t tmp;
+
+    if (index_log_container >= blf_data->log_containers->len) {
+        ws_debug("blf_pull_logcontainer_into_memory: cannot pull an unknown log container into memory");
+        return FALSE;
+    }
+
+    tmp = g_array_index(blf_data->log_containers, blf_log_container_t, index_log_container);
+
+    if (tmp.real_data != NULL) {
+        return TRUE;
+    }
+
+    if (tmp.compression_method == BLF_COMPRESSION_ZLIB) {
+#ifdef HAVE_ZLIB
+        int err = 0;
+        gchar *err_info;
+
+        file_seek(params->fh, tmp.infile_data_start, SEEK_SET, &err);
+        if (err < 0) {
+            ws_debug("blf_pull_logcontainer_into_memory: cannot seek to start of log_container");
+            return FALSE;
+        }
+
+        /* pull compressed data into buffer */
+        unsigned char *compressed_data = g_try_malloc0(tmp.infile_length);
+        guint64 data_length = (unsigned int)tmp.infile_length - (tmp.infile_data_start - tmp.infile_start_pos);
+        if (!wtap_read_bytes_or_eof(params->fh, compressed_data, (unsigned int)data_length, &err, &err_info)) {
+            ws_debug("blf_pull_logcontainer_into_memory: cannot read compressed data");
+            return FALSE;
+        }
+
+        unsigned char *buf = g_try_malloc0(tmp.real_length);
+        z_stream infstream;
+        infstream.zalloc = Z_NULL;
+        infstream.zfree = Z_NULL;
+        infstream.opaque = Z_NULL;
+
+        infstream.avail_in  = (unsigned int)data_length;
+        infstream.next_in   = compressed_data;
+        infstream.avail_out = (unsigned int)tmp.real_length;
+        infstream.next_out  = buf;
+
+        // the actual DE-compression work.
+        inflateInit(&infstream);
+        inflate(&infstream, Z_NO_FLUSH);
+        inflateEnd(&infstream);
+
+        tmp.real_data = buf;
+        g_array_index(blf_data->log_containers, blf_log_container_t, index_log_container) = tmp;
+        return TRUE;
+#else
+        return FALSE;
+#endif
+    }
+
+    return FALSE;
+}
+
+/* returns position and -1, if compressed or split */
+gint64
+blf_translate_pos(blf_t *blf_data, gint64 pos) {
+    blf_log_container_t *tmp;
+    gint container_index;
+
+    if (blf_find_logcontainer_for_address(blf_data, pos, &tmp, &container_index)) {
+        if (tmp->compression_method == BLF_COMPRESSION_NONE) {
+            /* this should be the same as pos, as long as infile and real start pos stay the same. */
+            return tmp->infile_start_pos + pos - tmp->real_start_pos;
+        }
+    }
+    return -1;
+}
+
+gboolean
+blf_read_bytes_or_eof(blf_params_t *params, guint64 real_pos, void *target_buffer, unsigned int count, int *err, gchar **err_info) {
+    blf_log_container_t *start_container;
+    blf_log_container_t *end_container;
+    blf_log_container_t *current_container;
+
+    gint start_container_index = -1;
+    gint end_container_index   = -1;
+    gint current_container_index = -1;
+
+    unsigned int copied = 0;
+    unsigned int data_left;
+    unsigned int start_in_buf;
+
+    unsigned char *buf = (unsigned char *)target_buffer;
+
+    if (!blf_find_logcontainer_for_address(params->blf_data, real_pos, &start_container, &start_container_index)) {
+        ws_debug("blf_read_bytes_or_eof: cannot read data because start position cannot be mapped");
+        return FALSE;
+    }
+    if (!blf_find_logcontainer_for_address(params->blf_data, real_pos + count - 1, &end_container, &end_container_index)) {
+        ws_debug("blf_read_bytes_or_eof: cannot read data because end position cannot be mapped");
+        return FALSE;
+    }
+
+    current_container_index = start_container_index;
+    current_container = start_container;
+    start_in_buf = (unsigned int)real_pos - (unsigned int)start_container->real_start_pos;
+
+    switch (start_container->compression_method) {
+    case BLF_COMPRESSION_NONE:
+        while (current_container_index <= end_container_index) {
+            if (!blf_get_logcontainer_by_index(params->blf_data, current_container_index, &current_container)) {
+                ws_debug("blf_read_bytes_or_eof: cannot refresh container");
+                return FALSE;
+            }
+
+            data_left = (unsigned int)(current_container->real_length - start_in_buf);
+
+            if (file_seek(params->fh, current_container->infile_data_start + start_in_buf, SEEK_SET, err) < 0) {
+                ws_debug("blf_read_bytes_or_eof: cannot seek data");
+                return FALSE;
+            }
+
+            if (data_left < (count - copied)) {
+                if (!wtap_read_bytes_or_eof(params->fh, buf + copied, data_left, err, err_info)) {
+                    ws_debug("blf_read_bytes_or_eof: cannot read data");
+                    return FALSE;
+                }
+                copied += data_left;
+                current_container_index++;
+                start_in_buf = 0;
+            } else {
+                if (!wtap_read_bytes_or_eof(params->fh, buf + copied, count - copied, err, err_info)) {
+                    ws_debug("blf_read_bytes_or_eof: cannot read data");
+                    return FALSE;
+                }
+                return TRUE;
+            }
+        }
+        break;
+
+    case BLF_COMPRESSION_ZLIB:
+            while (current_container_index <= end_container_index) {
+            if (!blf_pull_logcontainer_into_memory(params, current_container_index)) {
+                ws_debug("blf_read_bytes_or_eof: cannot pull in container");
+                return FALSE;
+            }
+
+            if (!blf_get_logcontainer_by_index(params->blf_data, current_container_index, &current_container)) {
+                ws_debug("blf_read_bytes_or_eof: cannot refresh container");
+                return FALSE;
+            }
+
+            if (current_container->real_data == NULL) {
+                ws_debug("blf_read_bytes_or_eof: pulling in container failed hard");
+                return FALSE;
+            }
+
+            data_left = (unsigned int)(current_container->real_length - start_in_buf);
+
+            if (data_left < (count - copied)) {
+                memcpy(buf + copied, current_container->real_data + start_in_buf, (unsigned int)data_left);
+                copied += data_left;
+                current_container_index++;
+                start_in_buf = 0;
+            } else {
+                memcpy(buf + copied, current_container->real_data + start_in_buf, count - copied);
+                return TRUE;
+            }
+        }
+        break;
+
+    default:
+        ws_debug("blf_read_bytes_or_eof: unknown compression method");
+        return FALSE;
+    }
+
+    return FALSE;
+}
+
+/* this is only called once on open to figure out the layout of the file */
+gboolean
+blf_scan_file_for_logcontainers(blf_params_t *params) {
+    blf_blockheader_t        header;
+    blf_logcontainerheader_t logcontainer_header;
+    blf_log_container_t      tmp;
+
+    int    err;
+    gchar *err_info;
+
+    guint64  current_start_pos;
+    guint64  current_real_start  = 0;
+
+    while (1) {
+        current_start_pos = file_tell(params->fh);
+
+        /* Find Object */
+        while (1) {
+            if (!wtap_read_bytes_or_eof(params->fh, &header, sizeof header, &err, &err_info)) {
+                ws_debug("we found end of file");
+
+                /* lets ignore some bytes at the end since some implementations think it is ok to add a few zero bytes */
+                if (err == WTAP_ERR_SHORT_READ) {
+                    err = 0;
+                }
+
+                return TRUE;
+            }
+
+            fix_endianness_blf_blockheader(&header);
+
+            if (memcmp(header.magic, blf_obj_magic, sizeof(blf_obj_magic))) {
+                ws_debug("object magic is not LOBJ");
+            } else {
+                break;
+            }
+
+            /* we are moving back and try again but 1 byte later */
+            /* TODO: better understand how this paddings works... */
+            current_start_pos++;
+            if (file_seek(params->fh, current_start_pos, SEEK_SET, &err) < 0) {
+                return FALSE;
+            }
+        }
+
+        if (header.header_type != BLF_HEADER_TYPE_DEFAULT) {
+            ws_debug("unknown header type, I know only BLF_HEADER_TYPE_DEFAULT (1)");
+            return FALSE;
+        }
+
+        switch (header.object_type) {
+        case BLF_OBJTYPE_LOG_CONTAINER:
+            /* skip unknown header part if needed */
+            if (header.header_length - sizeof(blf_blockheader_t) > 0) {
+                /* seek over unknown header part */
+                if (file_seek(params->fh, current_start_pos + header.header_length, SEEK_SET, &err) < 0) {
+                    ws_debug("cannot seek file for skipping unknown header bytes in log container");
+                    return FALSE;
+                }
+            }
+
+            if (!wtap_read_bytes_or_eof(params->fh, &logcontainer_header, sizeof(blf_logcontainerheader_t), &err, &err_info)) {
+                ws_debug("not enough bytes for log container header");
+                return FALSE;
+            }
+
+            //tmp = g_malloc(sizeof(blf_log_container_t));
+            blf_init_logcontainer(&tmp);
+
+            tmp.infile_start_pos = current_start_pos;
+            tmp.infile_data_start = file_tell(params->fh);
+            tmp.infile_length = header.object_length;
+
+            tmp.real_start_pos = current_real_start;
+            tmp.real_length = logcontainer_header.uncompressed_size;
+            tmp.compression_method = logcontainer_header.compression_method;
+
+            /* set up next start position */
+            current_real_start += logcontainer_header.uncompressed_size;
+
+            if (file_seek(params->fh, current_start_pos + header.object_length, SEEK_SET, &err) < 0) {
+                ws_debug("cannot seek file for skipping log container bytes");
+                return FALSE;
+            }
+
+            blf_add_logcontainer(params->blf_data, tmp);
+
+            break;
+        default:
+            ws_debug("we found a non BLF log container on top level. this is unexpected.");
+
+            /* TODO: maybe create "fake Log Container" for this */
+            if (file_seek(params->fh, current_start_pos + header.object_length, SEEK_SET, &err) < 0) {
+                return FALSE;
+            }
+        }
+    }
+
+    params->blf_data->current_real_seek_pos = 0;
+
+    return TRUE;
+}
+
+void
+blf_init_rec(blf_params_t *params, guint64 object_timestamp, int pkt_encap, guint32 channel) {
+    params->rec->rec_type = REC_TYPE_PACKET;
+    params->rec->tsprec = WTAP_TSPREC_NSEC;       /* there is no 10us, maybe we should update this*/
+    params->rec->ts.secs = object_timestamp / (1000 * 1000 * 1000);
+    params->rec->ts.nsecs = object_timestamp % (1000 * 1000 * 1000);
+
+    params->rec->rec_header.packet_header.pkt_encap = pkt_encap;
+    params->rec->rec_header.packet_header.interface_id = channel;
+    params->rec->rec_header.packet_header.drop_count = 0;
+    params->rec->rec_header.packet_header.packet_id = 0;
+    params->rec->rec_header.packet_header.interface_queue = 0;
+
+    /* TODO: before we had to remove comments and verdict here to not leak memory but APIs have changed ... */
+}
+
+gboolean
+blf_read_ethernetframe(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_ethernetframeheader_t ethheader;
+    guint8 tmpbuf[18];
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_ethernetframe: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_ethernetframe: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(blf_ethernetframeheader_t)) {
+        ws_debug("blf_read_ethernetframe: not enough bytes for ethernet frame header in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &ethheader, sizeof(ethheader), err, err_info)) {
+        ws_debug("blf_read_ethernetframe: not enough bytes for ethernet frame header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_ethernetframeheader(&ethheader);
+
+    /*
+     * BLF breaks up and reorders the Ethernet header and VLAN tag fields.
+     * This is a really bad design and makes this format one of the worst.
+     * If you want a fast format that keeps your data intact, avoid this format!
+     * So, lets hope we can reconstruct the original packet successfully.
+     */
+
+    tmpbuf[0] = ethheader.dst_addr[0];
+    tmpbuf[1] = ethheader.dst_addr[1];
+    tmpbuf[2] = ethheader.dst_addr[2];
+    tmpbuf[3] = ethheader.dst_addr[3];
+    tmpbuf[4] = ethheader.dst_addr[4];
+    tmpbuf[5] = ethheader.dst_addr[5];
+    tmpbuf[6] = ethheader.src_addr[0];
+    tmpbuf[7] = ethheader.src_addr[1];
+    tmpbuf[8] = ethheader.src_addr[2];
+    tmpbuf[9] = ethheader.src_addr[3];
+    tmpbuf[10] = ethheader.src_addr[4];
+    tmpbuf[11] = ethheader.src_addr[5];
+
+    if (ethheader.tpid != 0 && ethheader.tci != 0) {
+        tmpbuf[12] = (ethheader.tpid & 0xff00) >> 8;
+        tmpbuf[13] = (ethheader.tpid & 0x00ff);
+        tmpbuf[14] = (ethheader.tci & 0xff00) >> 8;
+        tmpbuf[15] = (ethheader.tci & 0x00ff);
+        tmpbuf[16] = (ethheader.ethtype & 0xff00) >> 8;
+        tmpbuf[17] = (ethheader.ethtype & 0x00ff);
+        ws_buffer_assure_space(params->buf, (gsize)18 + ethheader.payloadlength);
+        ws_buffer_append(params->buf, tmpbuf, (gsize)18);
+        params->rec->rec_header.packet_header.caplen = ((guint32)18 + ethheader.payloadlength);
+        params->rec->rec_header.packet_header.len = ((guint32)18 + ethheader.payloadlength);
+    } else {
+        tmpbuf[12] = (ethheader.ethtype & 0xff00) >> 8;
+        tmpbuf[13] = (ethheader.ethtype & 0x00ff);
+        ws_buffer_assure_space(params->buf, (gsize)14 + ethheader.payloadlength);
+        ws_buffer_append(params->buf, tmpbuf, (gsize)14);
+        params->rec->rec_header.packet_header.caplen = ((guint32)14 + ethheader.payloadlength);
+        params->rec->rec_header.packet_header.len = ((guint32)14 + ethheader.payloadlength);
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start + sizeof(blf_ethernetframeheader_t), ws_buffer_end_ptr(params->buf), ethheader.payloadlength, err, err_info)) {
+        ws_debug("blf_read_ethernetframe: copying ethernet frame failed");
+        return FALSE;
+    }
+    params->buf->first_free += ethheader.payloadlength;
+
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID;
+    blf_init_rec(params, logheader.object_timestamp, WTAP_ENCAP_ETHERNET, ethheader.channel);
+
+    return TRUE;
+}
+
+gboolean
+blf_read_ethernetframe_ext(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_ethernetframeheader_ex_t ethheader;
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_ethernetframe_ex: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_ethernetframe_ex: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(blf_ethernetframeheader_ex_t)) {
+        ws_debug("blf_read_ethernetframe_ex: not enough bytes for ethernet frame header in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &ethheader, sizeof(blf_ethernetframeheader_ex_t), err, err_info)) {
+        ws_debug("blf_read_ethernetframe_ex: not enough bytes for ethernet frame header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_ethernetframeheader_ex(&ethheader);
+
+    ws_buffer_assure_space(params->buf, ethheader.frame_length);
+
+    if (object_length - (data_start - block_start) - sizeof(blf_ethernetframeheader_ex_t) < ethheader.frame_length) {
+        ws_debug("blf_read_ethernetframe_ext: frame too short");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start + sizeof(blf_ethernetframeheader_ex_t), ws_buffer_start_ptr(params->buf), ethheader.frame_length, err, err_info)) {
+        ws_debug("blf_read_ethernetframe_ex: copying ethernet frame failed");
+        return FALSE;
+    }
+
+    blf_init_rec(params, logheader.object_timestamp, WTAP_ENCAP_ETHERNET, ethheader.channel);
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID | WTAP_HAS_INT_QUEUE;
+    params->rec->rec_header.packet_header.interface_queue = ethheader.hw_channel;
+    params->rec->rec_header.packet_header.caplen = ethheader.frame_length;
+    params->rec->rec_header.packet_header.len = ethheader.frame_length;
+    return TRUE;
+}
+
+static guint8 can_dlc_to_length[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 8, 8, 8, 8, 8, 8 };
+static guint8 canfd_dlc_to_length[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 16, 20, 24, 32, 48, 64 };
+
+gboolean
+blf_can_fill_buf_and_rec(blf_params_t *params, int *err, gchar **err_info, guint32 canid, guint8 payload_length, guint8 payload_length_valid, guint64 start_position,
+                         guint64 object_timestamp, guint32 channel) {
+    guint8   tmpbuf[8];
+    tmpbuf[0] = (canid & 0xff000000) >> 24;
+    tmpbuf[1] = (canid & 0x00ff0000) >> 16;
+    tmpbuf[2] = (canid & 0x0000ff00) >> 8;
+    tmpbuf[3] = (canid & 0x000000ff);
+    tmpbuf[4] = payload_length;
+    tmpbuf[5] = 0;
+    tmpbuf[6] = 0;
+    tmpbuf[7] = 0;
+
+    ws_buffer_assure_space(params->buf, sizeof(tmpbuf) + payload_length_valid);
+    ws_buffer_append(params->buf, tmpbuf, sizeof(tmpbuf));
+    params->rec->rec_header.packet_header.caplen = sizeof(tmpbuf) + payload_length_valid;
+    params->rec->rec_header.packet_header.len = sizeof(tmpbuf) + payload_length;
+
+    if (payload_length_valid > 0 && !blf_read_bytes_or_eof(params, start_position, ws_buffer_end_ptr(params->buf), payload_length_valid, err, err_info)) {
+        ws_debug("blf_can_fill_buf: copying can payload failed");
+        return FALSE;
+    }
+    params->buf->first_free += payload_length_valid;
+
+    blf_init_rec(params, object_timestamp, WTAP_ENCAP_SOCKETCAN, channel);
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID;
+
+    return TRUE;
+}
+
+gboolean
+blf_read_canmessage(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length, gboolean can_message2) {
+    blf_logobjectheader_t logheader;
+    blf_canmessage_t canheader;
+    blf_canmessage2_trailer_t can2trailer;
+
+    guint32  canid;
+    guint8   payload_length;
+    guint8   payload_length_valid;
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_canmessage: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_canmessage: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(canheader)) {
+        ws_debug("blf_read_canmessage: not enough bytes for canfd header in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &canheader, sizeof(canheader), err, err_info)) {
+        ws_debug("blf_read_canmessage: not enough bytes for can header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_canmessage(&canheader);
+
+    if (canheader.dlc > 15) {
+        canheader.dlc = 15;
+    }
+
+    payload_length = canheader.dlc;
+    if (payload_length > 8) {
+        ws_debug("blf_read_canmessage: regular CAN tries more than 8 bytes? Cutting to 8!");
+        payload_length = 8;
+    }
+
+    payload_length_valid = payload_length;
+
+    if (payload_length_valid > object_length - (data_start - block_start)) {
+        ws_debug("blf_read_canmessage: shortening CAN payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start));
+    }
+
+    canid = canheader.id;
+
+    if ((canheader.flags & BLF_CANMESSAGE_FLAG_RTR) == BLF_CANMESSAGE_FLAG_RTR) {
+        canid |= CAN_RTR_FLAG;
+        payload_length_valid = 0;
+    }
+
+    if (!blf_can_fill_buf_and_rec(params, err, err_info, canid, payload_length, payload_length_valid, data_start + sizeof(canheader), logheader.object_timestamp, canheader.channel)) {
+        return FALSE;
+    }
+
+    /* actually, we do not really need the data, right now.... */
+    if (can_message2) {
+        if (object_length < (data_start - block_start) + sizeof(canheader) + payload_length_valid + sizeof(can2trailer)) {
+            ws_debug("blf_read_canmessage2: not enough bytes for can message 2 trailer");
+            return FALSE;
+        }
+        if (!blf_read_bytes_or_eof(params, data_start + sizeof(canheader) + payload_length_valid, &can2trailer, sizeof(can2trailer), err, err_info)) {
+            ws_debug("blf_read_canmessage2: not enough bytes for can message 2 trailer in file");
+            return FALSE;
+        }
+        fix_endianness_blf_canmessage2_trailer(&can2trailer);
+    }
+
+    return TRUE;
+}
+
+gboolean
+blf_read_canfdmessage(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_canfdmessage_t canheader;
+
+    gboolean canfd;
+    guint32  canid;
+    guint8   payload_length;
+    guint8   payload_length_valid;
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(canheader)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for canfd header in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &canheader, sizeof(canheader), err, err_info)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for canfd header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_canfdmessage(&canheader);
+
+    if (canheader.dlc > 15) {
+        canheader.dlc = 15;
+    }
+
+    canfd = (canheader.canfdflags & BLF_CANFDMESSAGE_CANFDFLAG_EDL) == BLF_CANFDMESSAGE_CANFDFLAG_EDL;
+    if (canfd) {
+        payload_length = canfd_dlc_to_length[canheader.dlc];
+    } else {
+        if (canheader.dlc > 8) {
+            ws_debug("blf_read_canfdmessage64: regular CAN tries more than 8 bytes?");
+        }
+        payload_length = can_dlc_to_length[canheader.dlc];
+    }
+
+    payload_length_valid = payload_length;
+
+    if (payload_length_valid > canheader.validDataBytes) {
+        ws_debug("blf_read_canfdmessage: shortening canfd payload because valid data bytes shorter!");
+        payload_length_valid = canheader.validDataBytes;
+    }
+
+    if (payload_length_valid > object_length - (data_start - block_start) + sizeof(canheader)) {
+        ws_debug("blf_read_canfdmessage: shortening can payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start));
+    }
+
+    canid = canheader.id;
+
+    if ((canheader.flags & BLF_CANMESSAGE_FLAG_RTR) == BLF_CANMESSAGE_FLAG_RTR) {
+        canid |= CAN_RTR_FLAG;
+        payload_length_valid = 0;
+    }
+
+    if (!blf_can_fill_buf_and_rec(params, err, err_info, canid, payload_length, payload_length_valid, data_start + sizeof(canheader), logheader.object_timestamp, canheader.channel)) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+gboolean
+blf_read_canfdmessage64(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_canfdmessage64_t canheader;
+
+    gboolean canfd;
+    guint32  canid;
+    guint8   payload_length;
+    guint8   payload_length_valid;
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(canheader)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for canfd header in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &canheader, sizeof(canheader), err, err_info)) {
+        ws_debug("blf_read_canfdmessage64: not enough bytes for canfd header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_canfdmessage64(&canheader);
+
+
+    if (canheader.dlc > 15) {
+        canheader.dlc = 15;
+    }
+
+    canfd = (canheader.flags & BLF_CANFDMESSAGE64_FLAG_EDL) == BLF_CANFDMESSAGE64_FLAG_EDL;
+    if (canfd) {
+        payload_length = canfd_dlc_to_length[canheader.dlc];
+    } else {
+        if (canheader.dlc > 8) {
+            ws_debug("blf_read_canfdmessage64: regular CAN tries more than 8 bytes?");
+        }
+        payload_length = can_dlc_to_length[canheader.dlc];
+    }
+
+    payload_length_valid = payload_length;
+
+    if (payload_length_valid > canheader.validDataBytes) {
+        ws_debug("blf_read_canfdmessage64: shortening canfd payload because valid data bytes shorter!");
+        payload_length_valid = canheader.validDataBytes;
+    }
+
+    if (payload_length_valid > object_length - (data_start - block_start)) {
+        ws_debug("blf_read_canfdmessage64: shortening can payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start));
+    }
+
+    canid = canheader.id;
+
+    if ((canid & CAN_EFF_FLAG) == CAN_EFF_FLAG) {
+        if ((canheader.flags & BLF_CANFDMESSAGE64_FLAG_SRR) == BLF_CANFDMESSAGE64_FLAG_SRR) {
+            canid |= CAN_RTR_FLAG;
+            payload_length_valid = 0;
+        }
+    } else {
+        if ((canheader.flags & BLF_CANFDMESSAGE64_FLAG_REMOTE_FRAME) == BLF_CANFDMESSAGE64_FLAG_REMOTE_FRAME) {
+            canid |= CAN_RTR_FLAG;
+            payload_length_valid = 0;
+        }
+    }
+
+    if (!blf_can_fill_buf_and_rec(params, err, err_info, canid, payload_length, payload_length_valid, data_start + sizeof(canheader), logheader.object_timestamp, canheader.channel)) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+gboolean
+blf_read_flexraydata(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_flexraydata_t frheader;
+
+    guint8 payload_length;
+    guint8 payload_length_valid;
+    guint8 tmpbuf[7];
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_flexraydata: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_flexraydata: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(frheader)) {
+        ws_debug("blf_read_flexraydata: not enough bytes for flexrayheader in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &frheader, sizeof(frheader), err, err_info)) {
+        ws_debug("blf_read_flexraydata: not enough bytes for flexrayheader header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_flexraydata(&frheader);
+
+    payload_length = frheader.len;
+    payload_length_valid = payload_length;
+
+    if ((frheader.len & 0x01) == 0x01) {
+        ws_debug("blf_read_flexraydata: reading odd length in FlexRay!?");
+    }
+
+    if (payload_length_valid > object_length - (data_start - block_start) - sizeof(frheader)) {
+        ws_debug("blf_read_flexraydata: shortening FlexRay payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start) - sizeof(frheader));
+    }
+
+    if (frheader.channel != 0 && frheader.channel != 1) {
+        ws_debug("blf_read_flexraydata: FlexRay supports only two channels.");
+    }
+
+    /* Measurement Header */
+    if (frheader.channel == 0) {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME;
+    } else {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME | BLF_FLEXRAYDATA_CHANNEL_B;
+    }
+
+    /* Error Flags */
+    tmpbuf[1] = 0;
+
+    /* Frame Header */
+    tmpbuf[2] = 0x20 | ((0x0700 & frheader.messageId) >> 8);
+    tmpbuf[3] = 0x00ff & frheader.messageId;
+    tmpbuf[4] = (0xfe & frheader.len) | ((frheader.crc & 0x0400) >> 10);
+    tmpbuf[5] = (0x03fc & frheader.crc) >> 2;
+    tmpbuf[6] = ((0x0003 & frheader.crc) << 6) | (0x3f & frheader.mux);
+
+    ws_buffer_assure_space(params->buf, sizeof(tmpbuf) + payload_length_valid);
+    ws_buffer_append(params->buf, tmpbuf, sizeof(tmpbuf));
+    params->rec->rec_header.packet_header.caplen = sizeof(tmpbuf) + payload_length_valid;
+    params->rec->rec_header.packet_header.len = sizeof(tmpbuf) + payload_length;
+
+    if (payload_length_valid > 0 && !blf_read_bytes_or_eof(params, data_start + sizeof(frheader), ws_buffer_end_ptr(params->buf), payload_length_valid, err, err_info)) {
+        ws_debug("blf_read_flexraydata: copying can payload failed");
+        return FALSE;
+    }
+    params->buf->first_free += payload_length_valid;
+
+    blf_init_rec(params, logheader.object_timestamp, WTAP_ENCAP_FLEXRAY, frheader.channel);
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID;
+
+    return TRUE;
+}
+
+gboolean
+blf_read_flexraymessage(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length) {
+    blf_logobjectheader_t logheader;
+    blf_flexraymessage_t frheader;
+
+    guint8 payload_length;
+    guint8 payload_length_valid;
+    guint8 tmpbuf[7];
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if (object_length < (data_start - block_start) + sizeof(frheader)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for flexrayheader in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &frheader, sizeof(frheader), err, err_info)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for flexrayheader header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_flexraymessage(&frheader);
+
+    payload_length = frheader.length;
+    payload_length_valid = payload_length;
+
+    if ((frheader.length & 0x01) == 0x01) {
+        ws_debug("blf_read_flexraymessage: reading odd length in FlexRay!?");
+    }
+
+    if (payload_length_valid > object_length - (data_start - block_start) - sizeof(frheader)) {
+        ws_debug("blf_read_flexraymessage: shortening FlexRay payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start) - sizeof(frheader));
+    }
+
+    if (frheader.channel != 0 && frheader.channel != 1) {
+        ws_debug("blf_read_flexraymessage: FlexRay supports only two channels.");
+    }
+
+    /* Measurement Header */
+    if (frheader.channel == 0) {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME;
+    } else {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME | BLF_FLEXRAYDATA_CHANNEL_B;
+    }
+
+    /* Error Flags */
+    tmpbuf[1] = 0;
+
+    /* Frame Header */
+    tmpbuf[2] = ((0x0700 & frheader.frameId) >> 8);
+    if ((frheader.frameState & BLF_FLEXRAYMESSAGE_STATE_PPI) == BLF_FLEXRAYMESSAGE_STATE_PPI) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_PPI;
+    }
+
+    if ((frheader.frameState & BLF_FLEXRAYMESSAGE_STATE_SFI) == BLF_FLEXRAYMESSAGE_STATE_SFI) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_SFI;
+    }
+
+    if ((frheader.frameState & BLF_FLEXRAYMESSAGE_STATE_NFI) != BLF_FLEXRAYMESSAGE_STATE_NFI) {
+        /* NFI needs to be inversed !? */
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_NFI;
+    }
+
+    if ((frheader.frameState & BLF_FLEXRAYMESSAGE_STATE_STFI) == BLF_FLEXRAYMESSAGE_STATE_STFI) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_STFI;
+    }
+
+    tmpbuf[3] = 0x00ff & frheader.frameId;
+    tmpbuf[4] = (0xfe & frheader.length) | ((frheader.headerCrc & 0x0400) >> 10);
+    tmpbuf[5] = (0x03fc & frheader.headerCrc) >> 2;
+    tmpbuf[6] = ((0x0003 & frheader.headerCrc) << 6) | (0x3f & frheader.cycle);
+
+    ws_buffer_assure_space(params->buf, sizeof(tmpbuf) + payload_length_valid);
+    ws_buffer_append(params->buf, tmpbuf, sizeof(tmpbuf));
+    params->rec->rec_header.packet_header.caplen = sizeof(tmpbuf) + payload_length_valid;
+    params->rec->rec_header.packet_header.len = sizeof(tmpbuf) + payload_length;
+
+    if (payload_length_valid > 0 && !blf_read_bytes_or_eof(params, data_start + sizeof(frheader), ws_buffer_end_ptr(params->buf), payload_length_valid, err, err_info)) {
+        ws_debug("blf_read_flexraymessage: copying can payload failed");
+        return FALSE;
+    }
+    params->buf->first_free += payload_length_valid;
+
+    blf_init_rec(params, logheader.object_timestamp, WTAP_ENCAP_FLEXRAY, frheader.channel);
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID;
+
+    return TRUE;
+}
+
+gboolean
+blf_read_flexrayrcvmessageex(blf_params_t *params, int *err, gchar **err_info, gint64 block_start, gint64 header2_start, gint64 data_start, guint64 object_length, gboolean ext) {
+    blf_logobjectheader_t logheader;
+    blf_flexrayrcvmessage_t frheader;
+
+    guint16 payload_length;
+    guint16 payload_length_valid;
+    guint8  tmpbuf[7];
+    gint    frheadersize = sizeof(frheader);
+
+    if (ext) {
+        frheadersize += 40;
+    }
+
+    if (data_start - header2_start < (gint64)sizeof(blf_logobjectheader_t)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for timestamp header");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, header2_start, &logheader, sizeof(logheader), err, err_info)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for logheader");
+        return FALSE;
+    }
+    fix_endianness_blf_logobjectheader(&logheader);
+
+    if ((gint64)object_length < (data_start - block_start) + frheadersize) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for flexrayheader in object");
+        return FALSE;
+    }
+
+    if (!blf_read_bytes_or_eof(params, data_start, &frheader, sizeof(frheader), err, err_info)) {
+        ws_debug("blf_read_flexraymessage: not enough bytes for flexrayheader header in file");
+        return FALSE;
+    }
+    fix_endianness_blf_flexrayrcvmessage(&frheader);
+
+    if (!ext) {
+        frheader.dir &= 0xff;
+        frheader.cycle &= 0xff;
+    }
+
+    payload_length = frheader.payloadLength;
+    payload_length_valid = frheader.payloadLengthValid;
+
+    if ((frheader.payloadLength & 0x01) == 0x01) {
+        ws_debug("blf_read_flexraymessage: reading odd length in FlexRay!?");
+    }
+
+    if (payload_length_valid > object_length - (data_start - block_start) - frheadersize) {
+        ws_debug("blf_read_flexraymessage: shortening FlexRay payload because buffer is too short!");
+        payload_length_valid = (guint8)(object_length - (data_start - block_start) - frheadersize);
+    }
+
+    /* Measurement Header */
+    /* TODO: It seems that this format support both channels at the same time!? */
+    if (frheader.channelMask == BLF_FLEXRAYRCVMSG_CHANNELMASK_A) {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME;
+    } else {
+        tmpbuf[0] = BLF_FLEXRAYDATA_FRAME | BLF_FLEXRAYDATA_CHANNEL_B;
+    }
+
+    /* Error Flags */
+    tmpbuf[1] = 0;
+
+    /* Frame Header */
+    tmpbuf[2] = ((0x0700 & frheader.frameId) >> 8);
+    if ((frheader.data & BLF_FLEXRAYRCVMSG_DATA_FLAG_PAYLOAD_PREAM) == BLF_FLEXRAYRCVMSG_DATA_FLAG_PAYLOAD_PREAM) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_PPI;
+    }
+
+    if ((frheader.data & BLF_FLEXRAYRCVMSG_DATA_FLAG_SYNC) == BLF_FLEXRAYRCVMSG_DATA_FLAG_SYNC) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_SFI;
+    }
+
+    if ((frheader.data & BLF_FLEXRAYRCVMSG_DATA_FLAG_NULL_FRAME) != BLF_FLEXRAYRCVMSG_DATA_FLAG_NULL_FRAME) {
+        /* NFI needs to be inversed !? */
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_NFI;
+    }
+
+    if ((frheader.data & BLF_FLEXRAYRCVMSG_DATA_FLAG_STARTUP) == BLF_FLEXRAYRCVMSG_DATA_FLAG_STARTUP) {
+        tmpbuf[2] |= BLF_DLT_FLEXRAY_STFI;
+    }
+
+    tmpbuf[3] = 0x00ff & frheader.frameId;
+    tmpbuf[4] = (0xfe & frheader.payloadLength) | ((frheader.headerCrc1 & 0x0400) >> 10);
+    tmpbuf[5] = (0x03fc & frheader.headerCrc1) >> 2;
+    tmpbuf[6] = ((0x0003 & frheader.headerCrc1) << 6) | (0x3f & frheader.cycle);
+
+    ws_buffer_assure_space(params->buf, sizeof(tmpbuf) + payload_length_valid);
+    ws_buffer_append(params->buf, tmpbuf, sizeof(tmpbuf));
+    params->rec->rec_header.packet_header.caplen = sizeof(tmpbuf) + payload_length_valid;
+    params->rec->rec_header.packet_header.len = sizeof(tmpbuf) + payload_length;
+
+    if (payload_length_valid > 0 && !blf_read_bytes_or_eof(params, data_start + frheadersize, ws_buffer_end_ptr(params->buf), payload_length_valid, err, err_info)) {
+        ws_debug("blf_read_flexraymessage: copying can payload failed");
+        return FALSE;
+    }
+    params->buf->first_free += payload_length_valid;
+
+    blf_init_rec(params, logheader.object_timestamp, WTAP_ENCAP_FLEXRAY, frheader.channelMask);
+    params->rec->presence_flags = WTAP_HAS_TS | WTAP_HAS_CAP_LEN | WTAP_HAS_INTERFACE_ID;
+
+    return TRUE;
+}
+
+
+gboolean
+blf_read_block(blf_params_t *params, gint64 start_pos, int *err, gchar **err_info) {
+    blf_blockheader_t header;
+    //gint64 infile_block_start = blf_translate_pos(params->blf_data, start_pos);
+
+    while (1) {
+        /* Find Object */
+
+        /* Resetting buffer */
+        params->buf->first_free = params->buf->start;
+
+        while (1) {
+            if (!blf_read_bytes_or_eof(params, start_pos, &header, sizeof header, err, err_info)) {
+                ws_debug("blf_read_block: not enough bytes for block header or unsupported file");
+                if (*err == WTAP_ERR_SHORT_READ) {
+                    /* we have found the end that is not a short read therefore. */
+                    *err = 0;
+                    g_free(*err_info);
+                }
+                return FALSE;
+            }
+
+            fix_endianness_blf_blockheader(&header);
+
+            if (memcmp(header.magic, blf_obj_magic, sizeof(blf_obj_magic))) {
+                ws_debug("object magic is not LOBJ");
+            } else {
+                break;
+            }
+
+            /* we are moving back and try again but 1 byte later */
+            /* TODO: better understand how this paddings works... */
+            start_pos++;
+        }
+        params->blf_data->start_of_last_obj = start_pos;
+
+        if (header.header_type != BLF_HEADER_TYPE_DEFAULT) {
+            ws_debug("unknown header type");
+            return FALSE;
+        }
+
+        /* already making sure that we start after this object next time. */
+        params->blf_data->current_real_seek_pos = start_pos + header.object_length;
+
+        switch (header.object_type) {
+        case BLF_OBJTYPE_LOG_CONTAINER:
+            ws_debug("blf_read_block: log container in log container not supported");
+            return FALSE;
+            break;
+
+        case BLF_OBJTYPE_ETHERNET_FRAME:
+            return blf_read_ethernetframe(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                          start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_ETHERNET_FRAME_EX:
+            return blf_read_ethernetframe_ext(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                              start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_CAN_MESSAGE:
+            return blf_read_canmessage(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                       start_pos + header.header_length, header.object_length, FALSE);
+            break;
+
+        case BLF_OBJTYPE_CAN_MESSAGE2:
+            return blf_read_canmessage(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                       start_pos + header.header_length, header.object_length, TRUE);
+            break;
+
+        case BLF_OBJTYPE_CAN_FD_MESSAGE:
+            return blf_read_canfdmessage(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                         start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_CAN_FD_MESSAGE_64:
+            return blf_read_canfdmessage64(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                           start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_FLEXRAY_DATA:
+            return blf_read_flexraydata(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                           start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_FLEXRAY_MESSAGE:
+            return blf_read_flexraymessage(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                           start_pos + header.header_length, header.object_length);
+            break;
+
+        case BLF_OBJTYPE_FLEXRAY_RCVMESSAGE:
+            return blf_read_flexrayrcvmessageex(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                                start_pos + header.header_length, header.object_length, FALSE);
+            break;
+
+        case BLF_OBJTYPE_FLEXRAY_RCVMESSAGE_EX:
+            return blf_read_flexrayrcvmessageex(params, err, err_info, start_pos, start_pos + sizeof(blf_blockheader_t),
+                                                start_pos + header.header_length, header.object_length, TRUE);
+            break;
+
+        default:
+            ws_debug("blf_read_block: unknown object type");
+            start_pos += header.object_length;
+        }
+    }
+    return TRUE;
+}
+
+static gboolean blf_read(wtap *wth, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info, gint64 *data_offset) {
+    blf_params_t blf_tmp;
+
+    blf_tmp.wth = wth;
+    blf_tmp.fh  = wth->fh;
+    blf_tmp.rec = rec;
+    blf_tmp.buf = buf;
+    blf_tmp.blf_data = (blf_t *)wth->priv;
+
+    if (!blf_read_block(&blf_tmp, blf_tmp.blf_data->current_real_seek_pos, err, err_info)) {
+        ws_debug("data_offset is %" G_GINT64_MODIFIER "d", *data_offset);
+        return FALSE;
+    }
+    *data_offset = blf_tmp.blf_data->start_of_last_obj;
+
+    return TRUE;
+}
+
+static gboolean blf_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info) {
+    blf_params_t blf_tmp;
+
+    blf_tmp.wth = wth;
+    blf_tmp.fh  = wth->random_fh;
+    blf_tmp.rec = rec;
+    blf_tmp.buf = buf;
+    blf_tmp.blf_data = (blf_t *)wth->priv;
+
+    if (!blf_read_block(&blf_tmp, seek_off, err, err_info)) {
+        ws_debug("couldn't read packet block (err=%d).", *err);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static void blf_close(wtap *wth) {
+    blf_t *blf = (blf_t *)wth->priv;
+
+    if (blf != NULL && blf->log_containers != NULL) {
+        for (guint i = 0; i < blf->log_containers->len; i++) {
+            blf_log_container_t *log_container = &g_array_index(blf->log_containers, blf_log_container_t, i);
+            if (log_container->real_data != NULL) {
+                g_free(log_container->real_data);
+            }
+        }
+        g_array_free(blf->log_containers, TRUE);
+        blf->log_containers = NULL;
+    }
+
+    return;
+}
+
+wtap_open_return_val
+blf_open(wtap *wth, int *err, gchar **err_info) {
+    blf_fileheader_t  header;
+    blf_t            *blf;
+    blf_params_t      params;
+
+    ws_debug("opening file");
+
+    if (!wtap_read_bytes_or_eof(wth->fh, &header, sizeof header, err, err_info)) {
+
+        ws_debug("wtap_read_bytes_or_eof() failed, err = %d.", *err);
+        if (*err == 0 || *err == WTAP_ERR_SHORT_READ) {
+            /*
+             * Short read or EOF.
+             *
+             * We're reading this as part of an open, so
+             * the file is too short to be a blf file.
+             */
+            *err = 0;
+            g_free(*err_info);
+            *err_info = NULL;
+            return WTAP_OPEN_NOT_MINE;
+        }
+        return WTAP_OPEN_ERROR;
+    }
+
+    fix_endianness_blf_fileheader(&header);
+
+    if (memcmp(header.magic, blf_magic, sizeof(blf_magic))) {
+        return WTAP_OPEN_NOT_MINE;
+    }
+
+    /* This seems to be an BLF! */
+    /* skip unknown part of header */
+    file_seek(wth->fh, header.header_length, SEEK_SET, err);
+
+    /* Prepare our private context. */
+    blf = g_new(blf_t, 1);
+    blf->log_containers = NULL;
+    blf->current_log_container = 0;
+    blf->current_real_seek_pos = 0;
+
+    /* embed in params */
+    params.blf_data = blf;
+    params.buf = NULL;
+    params.fh = wth->fh;
+    params.rec = NULL;
+    params.wth = wth;
+    params.blf_data->current_real_seek_pos = 0;
+
+    /* lets check out the layout of all log containers */
+    blf_scan_file_for_logcontainers(&params);
+
+    wth->priv = (void *)blf;
+    wth->file_encap = WTAP_ENCAP_UNKNOWN;
+    wth->snapshot_length = 0;
+    wth->file_tsprec = WTAP_TSPREC_UNKNOWN;
+    wth->subtype_read = blf_read;
+    wth->subtype_seek_read = blf_seek_read;
+    wth->subtype_close = blf_close;
+    wth->file_type_subtype = blf_file_type_subtype;
+
+    return WTAP_OPEN_MINE;
+}
+
+static const struct supported_block_type blf_blocks_supported[] = {
+    { WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
+};
+
+static const struct file_type_subtype_info blf_info = {
+        "BLF Logfile", "blf", "blf", NULL,
+        FALSE, BLOCKS_SUPPORTED(blf_blocks_supported),
+        NULL, NULL, NULL
+};
+
+void register_blf(void)
+{
+    blf_file_type_subtype = wtap_register_file_type_subtype(&blf_info);
+
+    /*
+     * Register name for backwards compatibility with the
+     * wtap_filetypes table in Lua.
+     */
+    wtap_register_backwards_compatibility_lua_name("BLF", blf_file_type_subtype);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */