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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "mksquashfs.h"
#include "util.h"
static int write_block(file_info_t *fi, sqfs_info_t *info)
{
size_t idx, bs;
ssize_t ret;
void *ptr;
idx = info->file_block_count++;
bs = info->super.block_size;
ret = info->cmp->do_block(info->cmp, info->block, bs,
info->scratch, bs);
if (ret < 0)
return -1;
if (ret > 0) {
ptr = info->scratch;
bs = ret;
fi->blocksizes[idx] = bs;
} else {
ptr = info->block;
fi->blocksizes[idx] = bs | (1 << 24);
}
ret = write_retry(info->outfd, ptr, bs);
if (ret < 0) {
perror("writing to output file");
return -1;
}
if ((size_t)ret < bs) {
fputs("write to output file truncated\n", stderr);
return -1;
}
info->super.bytes_used += bs;
return 0;
}
static int flush_fragments(sqfs_info_t *info)
{
size_t newsz, size;
file_info_t *fi;
uint64_t offset;
void *new, *ptr;
ssize_t ret;
if (info->num_fragments == info->max_fragments) {
newsz = info->max_fragments ? info->max_fragments * 2 : 16;
new = realloc(info->fragments,
sizeof(info->fragments[0]) * newsz);
if (new == NULL) {
perror("appending to fragment table");
return -1;
}
info->max_fragments = newsz;
info->fragments = new;
}
offset = info->super.bytes_used;
size = info->frag_offset;
for (fi = info->frag_list; fi != NULL; fi = fi->frag_next)
fi->fragment = info->num_fragments;
ret = info->cmp->do_block(info->cmp, info->fragment, size,
info->scratch, info->super.block_size);
if (ret < 0)
return -1;
info->fragments[info->num_fragments].start_offset = htole64(offset);
info->fragments[info->num_fragments].pad0 = 0;
if (ret > 0) {
ptr = info->scratch;
size = ret;
info->fragments[info->num_fragments].size = htole32(size);
} else {
ptr = info->fragment;
info->fragments[info->num_fragments].size =
htole32(size | (1 << 24));
}
info->num_fragments += 1;
ret = write_retry(info->outfd, ptr, size);
if (ret < 0) {
perror("writing to output file");
return -1;
}
if ((size_t)ret < size) {
fputs("write to output file truncated\n", stderr);
return -1;
}
memset(info->fragment, 0, info->super.block_size);
info->super.bytes_used += size;
info->frag_offset = 0;
info->frag_list = NULL;
info->super.flags &= ~SQFS_FLAG_NO_FRAGMENTS;
info->super.flags |= SQFS_FLAG_ALWAYS_FRAGMENTS;
return 0;
}
static int add_fragment(file_info_t *fi, sqfs_info_t *info, size_t size)
{
if (info->frag_offset + size > info->super.block_size) {
if (flush_fragments(info))
return -1;
}
fi->fragment_offset = info->frag_offset;
fi->frag_next = info->frag_list;
info->frag_list = fi;
memcpy((char *)info->fragment + info->frag_offset, info->block, size);
info->frag_offset += size;
return 0;
}
static int process_file(sqfs_info_t *info, file_info_t *fi)
{
uint64_t count = fi->size;
int infd, ret;
size_t diff;
infd = open(fi->input_file, O_RDONLY);
if (infd < 0) {
perror(fi->input_file);
return -1;
}
fi->startblock = info->super.bytes_used;
info->file_block_count = 0;
while (count != 0) {
diff = count > (uint64_t)info->super.block_size ?
info->super.block_size : count;
ret = read_retry(infd, info->block, diff);
if (ret < 0)
goto fail_read;
if ((size_t)ret < diff)
goto fail_trunc;
if (diff < info->super.block_size) {
if (add_fragment(fi, info, diff))
goto fail;
} else {
if (write_block(fi, info))
goto fail;
}
count -= diff;
}
close(infd);
return 0;
fail:
close(infd);
return -1;
fail_read:
fprintf(stderr, "read from %s: %s\n", fi->input_file, strerror(errno));
goto fail;
fail_trunc:
fprintf(stderr, "%s: truncated read\n", fi->input_file);
goto fail;
}
static int find_and_process_files(sqfs_info_t *info, tree_node_t *n)
{
if (S_ISDIR(n->mode)) {
for (n = n->data.dir->children; n != NULL; n = n->next) {
if (find_and_process_files(info, n))
return -1;
}
return 0;
}
if (S_ISREG(n->mode))
return process_file(info, n->data.file);
return 0;
}
int write_data_to_image(sqfs_info_t *info)
{
int ret;
info->block = malloc(info->super.block_size);
if (info->block == NULL) {
perror("allocating data block buffer");
return -1;
}
info->fragment = malloc(info->super.block_size);
if (info->fragment == NULL) {
perror("allocating fragment buffer");
free(info->block);
return -1;
}
info->scratch = malloc(info->super.block_size);
if (info->scratch == NULL) {
perror("allocating scratch buffer");
free(info->block);
free(info->fragment);
return -1;
}
ret = find_and_process_files(info, info->fs.root);
free(info->block);
free(info->fragment);
free(info->scratch);
info->block = NULL;
info->fragment = NULL;
info->scratch = NULL;
return ret;
}
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