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/**
* the network chunk-API
*
*
*/
#include <sys/types.h>
#include <sys/stat.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 overlaps with c->data.file.name */
c->data.mem = buffer_init();
c->next = NULL;
return c;
}
static void chunk_free(chunk *c) {
if (!c) return;
/* c->data.mem overlaps with c->data.file.name */
switch (c->type) {
case MEM_CHUNK: buffer_free(c->data.mem); break;
case FILE_CHUNK: buffer_free(c->data.file.name); break;
default: break;
}
free(c);
}
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;
}
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) {
/* move everything to the unused queue */
if (cq->last == NULL) return;
cq->last->next = cq->unused;
cq->unused = cq->first;
/* disconnect active chain */
cq->first = cq->last = NULL;
}
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->data.file.name, fn);
c->data.file.offset = offset;
c->data.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->data.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->data.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->data.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->data.mem);
chunkqueue_prepend_chunk(cq, c);
return c->data.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->data.mem);
chunkqueue_append_chunk(cq, c);
return c->data.mem;
}
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->data.mem->used ? c->data.mem->used - 1 : 0;
break;
case FILE_CHUNK:
len += c->data.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;
}
#ifdef DEBUG_CHUNK
static int write_chunkqueue(int fd, chunkqueue *c) {
UNUSED(fd);
UNUSED(c);
return 0;
}
int main(int argc, char **argv) {
chunkqueue *c;
buffer *b, *fn;
UNUSED(argc);
UNUSED(argv);
c = chunkqueue_init();
fn = buffer_init_string("server.c");
chunkqueue_append_file(c, fn, 0, 10);
chunkqueue_append_file(c, fn, 10, 10);
chunkqueue_append_file(c, fn, 20, 10);
write_chunkqueue(STDERR_FILENO, c);
chunkqueue_reset(c);
b = buffer_init();
buffer_copy_string(b, "\ntest string mit vielen Zeichen\n");
chunkqueue_append_buffer(c, b);
write_chunkqueue(STDERR_FILENO, c);
chunkqueue_reset(c);
chunkqueue_append_file(c, fn, 0, 10);
buffer_copy_string(b, "\ntest string mit vielen Zeichen\n");
chunkqueue_append_buffer(c, b);
chunkqueue_append_file(c, fn, 10, 10);
chunkqueue_append_file(c, fn, 20, 10);
chunkqueue_append_file(c, fn, 50, 40);
write_chunkqueue(STDERR_FILENO, c);
chunkqueue_reset(c);
chunkqueue_free(c);
return 0;
}
#endif