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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "data_writer.h"
#include "highlevel.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
struct data_writer_t {
void *block;
void *fragment;
void *scratch;
sqfs_fragment_t *fragments;
size_t num_fragments;
size_t max_fragments;
size_t frag_offset;
sqfs_super_t *super;
compressor_t *cmp;
int outfd;
};
static int write_compressed(data_writer_t *data, const void *in, size_t size,
uint32_t *outsize)
{
ssize_t ret;
ret = data->cmp->do_block(data->cmp, in, size, data->scratch,
data->super->block_size);
if (ret < 0)
return -1;
if (ret > 0 && (size_t)ret < size) {
size = ret;
ret = write_retry(data->outfd, data->scratch, size);
*outsize = size;
} else {
ret = write_retry(data->outfd, in, size);
*outsize = size | (1 << 24);
}
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;
}
data->super->bytes_used += ret;
return 0;
}
static int grow_fragment_table(data_writer_t *data)
{
size_t newsz;
void *new;
if (data->num_fragments == data->max_fragments) {
newsz = data->max_fragments ? data->max_fragments * 2 : 16;
new = realloc(data->fragments,
sizeof(data->fragments[0]) * newsz);
if (new == NULL) {
perror("appending to fragment table");
return -1;
}
data->max_fragments = newsz;
data->fragments = new;
}
return 0;
}
static bool is_zero_block(unsigned char *ptr, size_t size)
{
return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0;
}
int data_writer_flush_fragments(data_writer_t *data)
{
uint64_t offset;
uint32_t out;
if (data->frag_offset == 0)
return 0;
if (grow_fragment_table(data))
return -1;
offset = data->super->bytes_used;
if (write_compressed(data, data->fragment, data->frag_offset, &out))
return -1;
data->fragments[data->num_fragments].start_offset = htole64(offset);
data->fragments[data->num_fragments].pad0 = 0;
data->fragments[data->num_fragments].size = htole32(out);
data->num_fragments += 1;
data->frag_offset = 0;
data->super->flags &= ~SQFS_FLAG_NO_FRAGMENTS;
data->super->flags |= SQFS_FLAG_ALWAYS_FRAGMENTS;
return 0;
}
int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd)
{
uint64_t count = fi->size;
int blk_idx = 0;
uint32_t out;
ssize_t ret;
size_t diff;
fi->startblock = data->super->bytes_used;
fi->sparse = 0;
while (count != 0) {
diff = count > (uint64_t)data->super->block_size ?
data->super->block_size : count;
ret = read_retry(infd, data->block, diff);
if (ret < 0)
goto fail_read;
if ((size_t)ret < diff)
goto fail_trunc;
if (is_zero_block(data->block, diff)) {
if (diff < data->super->block_size) {
fi->fragment_offset = 0xFFFFFFFF;
fi->fragment = 0xFFFFFFFF;
} else {
fi->blocksizes[blk_idx++] = 0;
}
fi->sparse += diff;
count -= diff;
continue;
}
if (diff < data->super->block_size) {
if (data->frag_offset + diff > data->super->block_size) {
if (data_writer_flush_fragments(data))
return -1;
}
fi->fragment_offset = data->frag_offset;
fi->fragment = data->num_fragments;
memcpy((char *)data->fragment + data->frag_offset,
data->block, diff);
data->frag_offset += diff;
} else {
if (write_compressed(data, data->block,
data->super->block_size, &out)) {
return -1;
}
fi->blocksizes[blk_idx++] = out;
}
count -= diff;
}
return 0;
fail_read:
fprintf(stderr, "read from %s: %s\n", fi->input_file, strerror(errno));
return -1;
fail_trunc:
fprintf(stderr, "%s: truncated read\n", fi->input_file);
return -1;
}
data_writer_t *data_writer_create(sqfs_super_t *super, compressor_t *cmp,
int outfd)
{
data_writer_t *data;
data = calloc(1, sizeof(*data) + super->block_size * 3);
if (data == NULL) {
perror("creating data writer");
return NULL;
}
data->block = (char *)data + sizeof(*data);
data->fragment = (char *)data->block + super->block_size;
data->scratch = (char *)data->fragment + super->block_size;
data->super = super;
data->cmp = cmp;
data->outfd = outfd;
return data;
}
void data_writer_destroy(data_writer_t *data)
{
free(data->fragments);
free(data);
}
int data_writer_write_fragment_table(data_writer_t *data)
{
uint64_t start;
if (data->num_fragments == 0) {
data->super->fragment_entry_count = 0;
data->super->fragment_table_start = 0xFFFFFFFFFFFFFFFFUL;
return 0;
}
data->super->fragment_entry_count = data->num_fragments;
if (sqfs_write_table(data->outfd, data->super, data->fragments,
sizeof(data->fragments[0]), data->num_fragments,
&start, data->cmp)) {
return -1;
}
data->super->fragment_table_start = start;
return 0;
}
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