tape.c

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/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2025 Natalia Portillo.
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 * */
 
#include "aaruformat.h"
#include "log.h"

void process_tape_files_block(aaruformat_context *ctx, const IndexEntry *entry)
{
    long           pos              = 0;
    size_t         read_bytes       = 0;
    TapeFileHeader tape_file_header = {0};
 
    // Check if the context and image stream are valid
    if(ctx == NULL || ctx->imageStream == NULL)
    {
        FATAL("Invalid context or image stream.");
        return;
    }
 
    // Seek to block
    pos = fseek(ctx->imageStream, entry->offset, SEEK_SET);
    if(pos < 0 || ftell(ctx->imageStream) != entry->offset)
    {
        FATAL("Could not seek to %" PRIu64 " as indicated by index entry...", entry->offset);
 
        return;
    }
 
    // Even if those two checks shall have been done before
    read_bytes = fread(&tape_file_header, 1, sizeof(TapeFileHeader), ctx->imageStream);
 
    if(read_bytes != sizeof(TapeFileHeader))
    {
        TRACE("Could not read tape files header, continuing...");
        return;
    }
 
    if(tape_file_header.identifier != TapeFileBlock)
    {
        TRACE("Incorrect identifier for data block at position %" PRIu64 "\n", entry->offset);
        return;
    }
 
    ctx->image_info.ImageSize += sizeof(TapeFileEntry) * tape_file_header.entries;
 
    uint8_t *buffer = malloc(sizeof(TapeFileEntry) * tape_file_header.entries);
    if(buffer == NULL)
    {
        FATAL("Could not allocate memory for tape files block, continuing...");
        return;
    }
    read_bytes = fread(buffer, sizeof(TapeFileEntry), tape_file_header.entries, ctx->imageStream);
    if(read_bytes != tape_file_header.entries)
    {
        free(buffer);
        FATAL("Could not read tape files block, continuing...");
        return;
    }
    // Check CRC64
    uint64_t crc64 = aaruf_crc64_data(buffer, sizeof(TapeFileEntry) * tape_file_header.entries);
 
    if(crc64 != tape_file_header.crc64)
    {
        TRACE("Incorrect CRC found: 0x%" PRIx64 " found, expected 0x%" PRIx64 ", continuing...", crc64,
              tape_file_header.crc64);
        free(buffer);
        return;
    }
 
    // Insert entries into UTHASH array indexed by partition << 32 | file number
    const TapeFileEntry *entries = (TapeFileEntry *)buffer;
 
    for(uint32_t i = 0; i < tape_file_header.entries; i++)
    {
        // Create hash table entry
        tapeFileHashEntry *hash_entry = malloc(sizeof(tapeFileHashEntry));
        if(hash_entry == NULL)
        {
            FATAL("Could not allocate memory for tape file hash entry");
            continue;
        }
 
        // Create composite key: partition << 32 | file number
        hash_entry->key = (uint64_t)entries[i].Partition << 32 | entries[i].File;
 
        // Copy the tape file entry data
        hash_entry->fileEntry = entries[i];
 
        // Replace if exists, add if new
        tapeFileHashEntry *old_entry = NULL;
        HASH_REPLACE(hh, ctx->tape_files, key, sizeof(uint64_t), hash_entry, old_entry);
 
        // Free old entry if it was replaced
        if(old_entry != NULL)
        {
            TRACE("Replaced existing tape file entry for partition %u, file %u", entries[i].Partition, entries[i].File);
            free(old_entry);
        }
        else
            TRACE("Added new tape file entry for partition %u, file %u", entries[i].Partition, entries[i].File);
    }
 
    free(buffer);
}

void process_tape_partitions_block(aaruformat_context *ctx, const IndexEntry *entry)
{
    long                pos                   = 0;
    size_t              read_bytes            = 0;
    TapePartitionHeader tape_partition_header = {0};
 
    // Check if the context and image stream are valid
    if(ctx == NULL || ctx->imageStream == NULL)
    {
        FATAL("Invalid context or image stream.");
        return;
    }
 
    // Seek to block
    pos = fseek(ctx->imageStream, entry->offset, SEEK_SET);
    if(pos < 0 || ftell(ctx->imageStream) != entry->offset)
    {
        FATAL("Could not seek to %" PRIu64 " as indicated by index entry...", entry->offset);
 
        return;
    }
 
    // Even if those two checks shall have been done before
    read_bytes = fread(&tape_partition_header, 1, sizeof(TapePartitionHeader), ctx->imageStream);
 
    if(read_bytes != sizeof(TapePartitionHeader))
    {
        TRACE("Could not read tape partitions header, continuing...");
        return;
    }
 
    if(tape_partition_header.identifier != TapePartitionBlock)
    {
        TRACE("Incorrect identifier for data block at position %" PRIu64 "\n", entry->offset);
        return;
    }
 
    ctx->image_info.ImageSize += sizeof(TapePartitionEntry) * tape_partition_header.entries;
 
    uint8_t *buffer = malloc(sizeof(TapePartitionEntry) * tape_partition_header.entries);
    if(buffer == NULL)
    {
        FATAL("Could not allocate memory for tape partitions block, continuing...");
        return;
    }
    read_bytes = fread(buffer, sizeof(TapePartitionEntry), tape_partition_header.entries, ctx->imageStream);
    if(read_bytes != tape_partition_header.entries)
    {
        free(buffer);
        FATAL("Could not read tape partitions block, continuing...");
        return;
    }
    // Check CRC64
    uint64_t crc64 = aaruf_crc64_data(buffer, sizeof(TapePartitionEntry) * tape_partition_header.entries);
 
    if(crc64 != tape_partition_header.crc64)
    {
        TRACE("Incorrect CRC found: 0x%" PRIx64 " found, expected 0x%" PRIx64 ", continuing...", crc64,
              tape_partition_header.crc64);
        free(buffer);
        return;
    }
 
    // Insert entries into UTHASH array indexed by partition
    const TapePartitionEntry *entries = (TapePartitionEntry *)buffer;
 
    for(uint32_t i = 0; i < tape_partition_header.entries; i++)
    {
        // Create hash table entry
        TapePartitionHashEntry *hash_entry = malloc(sizeof(TapePartitionHashEntry));
        if(hash_entry == NULL)
        {
            FATAL("Could not allocate memory for tape partition hash entry");
            continue;
        }
 
        // Create key: partition
        hash_entry->key = entries[i].Number;
 
        // Copy the tape partition entry data
        hash_entry->partitionEntry = entries[i];
 
        // Replace if exists, add if new
        TapePartitionHashEntry *old_entry = NULL;
        HASH_REPLACE(hh, ctx->tape_partitions, key, sizeof(uint8_t), hash_entry, old_entry);
 
        // Free old entry if it was replaced
        if(old_entry != NULL)
        {
            TRACE("Replaced existing tape partition entry for partition %u", entries[i].Number);
            free(old_entry);
        }
        else
            TRACE("Added new tape partition entry for partition %u", entries[i].Number);
    }
 
    free(buffer);
}

int32_t aaruf_get_tape_file(const void *context, const uint8_t partition, const uint32_t file, uint64_t *starting_block,
                            uint64_t *ending_block)
{
    TRACE("Entering aaruf_get_tape_file(%p, %d, %d, %llu, %llu)", context, partition, file, *starting_block,
          *ending_block);
 
    const aaruformat_context *ctx = NULL;
 
    if(context == NULL)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_get_tape_file() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    ctx = context;
 
    // Not a libaaruformat context
    if(ctx->magic != AARU_MAGIC)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_get_tape_file() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    uint64_t           key   = (uint64_t)partition << 32 | file;
    tapeFileHashEntry *entry = NULL;
    HASH_FIND(hh, ctx->tape_files, &key, sizeof(uint64_t), entry);
 
    if(entry == NULL)
    {
        TRACE("Tape file not found");
        return AARUF_ERROR_TAPE_FILE_NOT_FOUND;
    }
 
    *starting_block = entry->fileEntry.FirstBlock;
    *ending_block   = entry->fileEntry.LastBlock;
 
    TRACE("Exiting aaruf_get_tape_file(%p, %d, %d, %llu, %llu) = AARUF_STATUS_OK", context, partition, file,
          *starting_block, *ending_block);
    return AARUF_STATUS_OK;
}

int32_t aaruf_set_tape_file(void *context, const uint8_t partition, const uint32_t file, const uint64_t starting_block,
                            const uint64_t ending_block)
{
    TRACE("Entering aaruf_set_tape_file(%p, %d, %d, %llu, %llu)", context, partition, file, starting_block,
          ending_block);
 
    aaruformat_context *ctx = NULL;
 
    if(context == NULL)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_set_tape_file() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    ctx = context;
 
    // Not a libaaruformat context
    if(ctx->magic != AARU_MAGIC)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_set_tape_file() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    // Check we are writing
    if(!ctx->is_writing)
    {
        FATAL("Trying to write a read-only image");
 
        TRACE("Exiting aaruf_set_tape_file() = AARUF_READ_ONLY");
        return AARUF_READ_ONLY;
    }
 
    // Create hash table entry
    tapeFileHashEntry *hash_entry = malloc(sizeof(tapeFileHashEntry));
    if(hash_entry == NULL)
    {
        FATAL("Could not allocate memory for tape file hash entry");
 
        TRACE("Exiting aaruf_set_tape_file() = AARUF_ERROR_NOT_ENOUGH_MEMORY");
        return AARUF_ERROR_NOT_ENOUGH_MEMORY;
    }
 
    // Create composite key: partition << 32 | file number
    hash_entry->key = (uint64_t)partition << 32 | file;
 
    // Copy the tape file entry data
    hash_entry->fileEntry.File       = file;
    hash_entry->fileEntry.Partition  = partition;
    hash_entry->fileEntry.FirstBlock = starting_block;
    hash_entry->fileEntry.LastBlock  = ending_block;
 
    // Replace if exists, add if new
    tapeFileHashEntry *old_entry = NULL;
    HASH_REPLACE(hh, ctx->tape_files, key, sizeof(uint64_t), hash_entry, old_entry);
 
    // Free old entry if it was replaced
    if(old_entry != NULL)
    {
        TRACE("Replaced existing tape file entry for partition %u, file %u", partition, file);
        free(old_entry);
    }
    else
        TRACE("Added new tape file entry for partition %u, file %u", partition, file);
 
    TRACE("Exiting aaruf_set_tape_file(%p, %d, %d, %llu, %llu) = AARUF_STATUS_OK", context, partition, file,
          starting_block, ending_block);
    return AARUF_STATUS_OK;
}

int32_t aaruf_get_tape_partition(const void *context, const uint8_t partition, uint64_t *starting_block,
                                 uint64_t *ending_block)
{
    TRACE("Entering aaruf_get_tape_partition(%p, %d, %llu, %llu)", context, partition, *starting_block, *ending_block);
 
    const aaruformat_context *ctx = NULL;
 
    if(context == NULL)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_get_tape_partition() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    ctx = context;
 
    // Not a libaaruformat context
    if(ctx->magic != AARU_MAGIC)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_get_tape_partition() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    uint8_t                 key   = partition;
    TapePartitionHashEntry *entry = NULL;
    HASH_FIND(hh, ctx->tape_partitions, &key, sizeof(uint8_t), entry);
 
    if(entry == NULL)
    {
        TRACE("Tape partition not found");
        return AARUF_ERROR_TAPE_PARTITION_NOT_FOUND;
    }
 
    *starting_block = entry->partitionEntry.FirstBlock;
    *ending_block   = entry->partitionEntry.LastBlock;
 
    TRACE("Exiting aaruf_get_tape_partition(%p, %d, %llu, %llu) = AARUF_STATUS_OK", context, partition, *starting_block,
          *ending_block);
    return AARUF_STATUS_OK;
}

int32_t aaruf_set_tape_partition(void *context, const uint8_t partition, const uint64_t starting_block,
                                 const uint64_t ending_block)
{
    TRACE("Entering aaruf_set_tape_partition(%p, %d, %llu, %llu)", context, partition, starting_block, ending_block);
 
    aaruformat_context *ctx = NULL;
 
    if(context == NULL)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_set_tape_partition() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    ctx = context;
 
    // Not a libaaruformat context
    if(ctx->magic != AARU_MAGIC)
    {
        FATAL("Invalid context");
 
        TRACE("Exiting aaruf_set_tape_partition() = AARUF_ERROR_NOT_AARUFORMAT");
        return AARUF_ERROR_NOT_AARUFORMAT;
    }
 
    // Check we are writing
    if(!ctx->is_writing)
    {
        FATAL("Trying to write a read-only image");
 
        TRACE("Exiting aaruf_set_tape_partition() = AARUF_READ_ONLY");
        return AARUF_READ_ONLY;
    }
 
    // Create hash table entry
    TapePartitionHashEntry *hash_entry = malloc(sizeof(TapePartitionHashEntry));
    if(hash_entry == NULL)
    {
        FATAL("Could not allocate memory for tape partition hash entry");
 
        TRACE("Exiting aaruf_set_tape_partition() = AARUF_ERROR_NOT_ENOUGH_MEMORY");
        return AARUF_ERROR_NOT_ENOUGH_MEMORY;
    }
 
    // Create key: partition
    hash_entry->key = partition;
 
    // Copy the tape partition entry data
    hash_entry->partitionEntry.Number     = partition;
    hash_entry->partitionEntry.FirstBlock = starting_block;
    hash_entry->partitionEntry.LastBlock  = ending_block;
 
    // Replace if exists, add if new
    TapePartitionHashEntry *old_entry = NULL;
    HASH_REPLACE(hh, ctx->tape_partitions, key, sizeof(uint8_t), hash_entry, old_entry);
 
    // Free old entry if it was replaced
    if(old_entry != NULL)
    {
        TRACE("Replaced existing tape partition entry for partition %u", partition);
        free(old_entry);
    }
    else
        TRACE("Added new tape partition entry for partition %u", partition);
 
    TRACE("Exiting aaruf_set_tape_partition(%p, %d, %llu, %llu) = AARUF_STATUS_OK", context, partition, starting_block,
          ending_block);
    return AARUF_STATUS_OK;
}