lighttpd 1.4.x https://www.lighttpd.net/
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/**
* the network chunk-API
*
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "chunk.h"
chunkqueue *chunkqueue_init(void) {
chunkqueue *cq;
cq = calloc(1, sizeof(*cq));
cq->first = NULL;
cq->last = NULL;
cq->unused = NULL;
return cq;
}
static chunk *chunk_init(void) {
chunk *c;
c = calloc(1, sizeof(*c));
c->mem = buffer_init();
c->file.name = buffer_init();
c->file.fd = -1;
c->file.mmap.start = MAP_FAILED;
c->next = NULL;
return c;
}
static void chunk_free(chunk *c) {
if (!c) return;
buffer_free(c->mem);
buffer_free(c->file.name);
free(c);
}
static void chunk_reset(chunk *c) {
if (!c) return;
buffer_reset(c->mem);
if (c->file.is_temp && !buffer_is_empty(c->file.name)) {
unlink(c->file.name->ptr);
}
buffer_reset(c->file.name);
if (c->file.fd != -1) {
close(c->file.fd);
c->file.fd = -1;
}
if (MAP_FAILED != c->file.mmap.start) {
munmap(c->file.mmap.start, c->file.mmap.length);
c->file.mmap.start = MAP_FAILED;
}
}
void chunkqueue_free(chunkqueue *cq) {
chunk *c, *pc;
if (!cq) return;
for (c = cq->first; c; ) {
pc = c;
c = c->next;
chunk_free(pc);
}
for (c = cq->unused; c; ) {
pc = c;
c = c->next;
chunk_free(pc);
}
free(cq);
}
static chunk *chunkqueue_get_unused_chunk(chunkqueue *cq) {
chunk *c;
/* check if we have a unused chunk */
if (!cq->unused) {
c = chunk_init();
} else {
/* take the first element from the list (a stack) */
c = cq->unused;
cq->unused = c->next;
c->next = NULL;
cq->unused_chunks--;
}
return c;
}
static int chunkqueue_prepend_chunk(chunkqueue *cq, chunk *c) {
c->next = cq->first;
cq->first = c;
if (cq->last == NULL) {
cq->last = c;
}
return 0;
}
static int chunkqueue_append_chunk(chunkqueue *cq, chunk *c) {
if (cq->last) {
cq->last->next = c;
}
cq->last = c;
if (cq->first == NULL) {
cq->first = c;
}
return 0;
}
void chunkqueue_reset(chunkqueue *cq) {
chunk *c;
/* move everything to the unused queue */
/* mark all read written */
for (c = cq->first; c; c = c->next) {
switch(c->type) {
case MEM_CHUNK:
c->offset = c->mem->used - 1;
break;
case FILE_CHUNK:
c->offset = c->file.length;
break;
default:
break;
}
}
chunkqueue_remove_finished_chunks(cq);
cq->bytes_in = 0;
cq->bytes_out = 0;
}
int chunkqueue_append_file(chunkqueue *cq, buffer *fn, off_t offset, off_t len) {
chunk *c;
if (len == 0) return 0;
c = chunkqueue_get_unused_chunk(cq);
c->type = FILE_CHUNK;
buffer_copy_string_buffer(c->file.name, fn);
c->file.start = offset;
c->file.length = len;
c->offset = 0;
chunkqueue_append_chunk(cq, c);
return 0;
}
int chunkqueue_append_buffer(chunkqueue *cq, buffer *mem) {
chunk *c;
if (mem->used == 0) return 0;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
buffer_copy_string_buffer(c->mem, mem);
chunkqueue_append_chunk(cq, c);
return 0;
}
int chunkqueue_append_buffer_weak(chunkqueue *cq, buffer *mem) {
chunk *c;
if (mem->used == 0) return 0;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
if (c->mem) buffer_free(c->mem);
c->mem = mem;
chunkqueue_append_chunk(cq, c);
return 0;
}
int chunkqueue_prepend_buffer(chunkqueue *cq, buffer *mem) {
chunk *c;
if (mem->used == 0) return 0;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
buffer_copy_string_buffer(c->mem, mem);
chunkqueue_prepend_chunk(cq, c);
return 0;
}
int chunkqueue_append_mem(chunkqueue *cq, const char * mem, size_t len) {
chunk *c;
if (len == 0) return 0;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
buffer_copy_string_len(c->mem, mem, len - 1);
chunkqueue_append_chunk(cq, c);
return 0;
}
buffer * chunkqueue_get_prepend_buffer(chunkqueue *cq) {
chunk *c;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
buffer_reset(c->mem);
chunkqueue_prepend_chunk(cq, c);
return c->mem;
}
buffer *chunkqueue_get_append_buffer(chunkqueue *cq) {
chunk *c;
c = chunkqueue_get_unused_chunk(cq);
c->type = MEM_CHUNK;
c->offset = 0;
buffer_reset(c->mem);
chunkqueue_append_chunk(cq, c);
return c->mem;
}
int chunkqueue_set_tempdirs(chunkqueue *cq, array *tempdirs) {
if (!cq) return -1;
cq->tempdirs = tempdirs;
return 0;
}
chunk *chunkqueue_get_append_tempfile(chunkqueue *cq) {
chunk *c;
buffer *template = buffer_init_string("/var/tmp/lighttpd-upload-XXXXXX");
c = chunkqueue_get_unused_chunk(cq);
c->type = FILE_CHUNK;
c->offset = 0;
if (cq->tempdirs && cq->tempdirs->used) {
size_t i;
/* we have several tempdirs, only if all of them fail we jump out */
for (i = 0; i < cq->tempdirs->used; i++) {
data_string *ds = (data_string *)cq->tempdirs->data[i];
buffer_copy_string_buffer(template, ds->value);
BUFFER_APPEND_SLASH(template);
BUFFER_APPEND_STRING_CONST(template, "lighttpd-upload-XXXXXX");
if (-1 != (c->file.fd = mkstemp(template->ptr))) {
/* only trigger the unlink if we created the temp-file successfully */
c->file.is_temp = 1;
break;
}
}
} else {
if (-1 != (c->file.fd = mkstemp(template->ptr))) {
/* only trigger the unlink if we created the temp-file successfully */
c->file.is_temp = 1;
}
}
buffer_copy_string_buffer(c->file.name, template);
c->file.length = 0;
chunkqueue_append_chunk(cq, c);
buffer_free(template);
return c;
}
off_t chunkqueue_length(chunkqueue *cq) {
off_t len = 0;
chunk *c;
for (c = cq->first; c; c = c->next) {
switch (c->type) {
case MEM_CHUNK:
len += c->mem->used ? c->mem->used - 1 : 0;
break;
case FILE_CHUNK:
len += c->file.length;
break;
default:
break;
}
}
return len;
}
off_t chunkqueue_written(chunkqueue *cq) {
off_t len = 0;
chunk *c;
for (c = cq->first; c; c = c->next) {
switch (c->type) {
case MEM_CHUNK:
case FILE_CHUNK:
len += c->offset;
break;
default:
break;
}
}
return len;
}
int chunkqueue_is_empty(chunkqueue *cq) {
return cq->first ? 0 : 1;
}
int chunkqueue_remove_finished_chunks(chunkqueue *cq) {
chunk *c;
for (c = cq->first; c; c = cq->first) {
int is_finished = 0;
switch (c->type) {
case MEM_CHUNK:
if (c->mem->used == 0 || (c->offset == (off_t)c->mem->used - 1)) is_finished = 1;
break;
case FILE_CHUNK:
if (c->offset == c->file.length) is_finished = 1;
break;
default:
break;
}
if (!is_finished) break;
chunk_reset(c);
cq->first = c->next;
if (c == cq->last) cq->last = NULL;
/* keep at max 4 chunks in the 'unused'-cache */
if (cq->unused_chunks > 4) {
chunk_free(c);
} else {
c->next = cq->unused;
cq->unused = c;
cq->unused_chunks++;
}
}
return 0;
}