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-rw-r--r--lib/nghttp2_buf.c527
1 files changed, 527 insertions, 0 deletions
diff --git a/lib/nghttp2_buf.c b/lib/nghttp2_buf.c
new file mode 100644
index 0000000..a328447
--- /dev/null
+++ b/lib/nghttp2_buf.c
@@ -0,0 +1,527 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp2_buf.h"
+
+#include <stdio.h>
+
+#include "nghttp2_helper.h"
+#include "nghttp2_debug.h"
+
+void nghttp2_buf_init(nghttp2_buf *buf) {
+ buf->begin = NULL;
+ buf->end = NULL;
+ buf->pos = NULL;
+ buf->last = NULL;
+ buf->mark = NULL;
+}
+
+int nghttp2_buf_init2(nghttp2_buf *buf, size_t initial, nghttp2_mem *mem) {
+ nghttp2_buf_init(buf);
+ return nghttp2_buf_reserve(buf, initial, mem);
+}
+
+void nghttp2_buf_free(nghttp2_buf *buf, nghttp2_mem *mem) {
+ if (buf == NULL) {
+ return;
+ }
+
+ nghttp2_mem_free(mem, buf->begin);
+ buf->begin = NULL;
+}
+
+int nghttp2_buf_reserve(nghttp2_buf *buf, size_t new_cap, nghttp2_mem *mem) {
+ uint8_t *ptr;
+ size_t cap;
+
+ cap = nghttp2_buf_cap(buf);
+
+ if (cap >= new_cap) {
+ return 0;
+ }
+
+ new_cap = nghttp2_max(new_cap, cap * 2);
+
+ ptr = nghttp2_mem_realloc(mem, buf->begin, new_cap);
+ if (ptr == NULL) {
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ buf->pos = ptr + (buf->pos - buf->begin);
+ buf->last = ptr + (buf->last - buf->begin);
+ buf->mark = ptr + (buf->mark - buf->begin);
+ buf->begin = ptr;
+ buf->end = ptr + new_cap;
+
+ return 0;
+}
+
+void nghttp2_buf_reset(nghttp2_buf *buf) {
+ buf->pos = buf->last = buf->mark = buf->begin;
+}
+
+void nghttp2_buf_wrap_init(nghttp2_buf *buf, uint8_t *begin, size_t len) {
+ buf->begin = buf->pos = buf->last = buf->mark = buf->end = begin;
+ if (len) {
+ buf->end += len;
+ }
+}
+
+static int buf_chain_new(nghttp2_buf_chain **chain, size_t chunk_length,
+ nghttp2_mem *mem) {
+ int rv;
+
+ *chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain));
+ if (*chain == NULL) {
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ (*chain)->next = NULL;
+
+ rv = nghttp2_buf_init2(&(*chain)->buf, chunk_length, mem);
+ if (rv != 0) {
+ nghttp2_mem_free(mem, *chain);
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ return 0;
+}
+
+static void buf_chain_del(nghttp2_buf_chain *chain, nghttp2_mem *mem) {
+ nghttp2_buf_free(&chain->buf, mem);
+ nghttp2_mem_free(mem, chain);
+}
+
+int nghttp2_bufs_init(nghttp2_bufs *bufs, size_t chunk_length, size_t max_chunk,
+ nghttp2_mem *mem) {
+ return nghttp2_bufs_init2(bufs, chunk_length, max_chunk, 0, mem);
+}
+
+int nghttp2_bufs_init2(nghttp2_bufs *bufs, size_t chunk_length,
+ size_t max_chunk, size_t offset, nghttp2_mem *mem) {
+ return nghttp2_bufs_init3(bufs, chunk_length, max_chunk, max_chunk, offset,
+ mem);
+}
+
+int nghttp2_bufs_init3(nghttp2_bufs *bufs, size_t chunk_length,
+ size_t max_chunk, size_t chunk_keep, size_t offset,
+ nghttp2_mem *mem) {
+ int rv;
+ nghttp2_buf_chain *chain;
+
+ if (chunk_keep == 0 || max_chunk < chunk_keep || chunk_length < offset) {
+ return NGHTTP2_ERR_INVALID_ARGUMENT;
+ }
+
+ rv = buf_chain_new(&chain, chunk_length, mem);
+ if (rv != 0) {
+ return rv;
+ }
+
+ bufs->mem = mem;
+ bufs->offset = offset;
+
+ bufs->head = chain;
+ bufs->cur = bufs->head;
+
+ nghttp2_buf_shift_right(&bufs->cur->buf, offset);
+
+ bufs->chunk_length = chunk_length;
+ bufs->chunk_used = 1;
+ bufs->max_chunk = max_chunk;
+ bufs->chunk_keep = chunk_keep;
+
+ return 0;
+}
+
+int nghttp2_bufs_realloc(nghttp2_bufs *bufs, size_t chunk_length) {
+ int rv;
+ nghttp2_buf_chain *chain;
+
+ if (chunk_length < bufs->offset) {
+ return NGHTTP2_ERR_INVALID_ARGUMENT;
+ }
+
+ rv = buf_chain_new(&chain, chunk_length, bufs->mem);
+ if (rv != 0) {
+ return rv;
+ }
+
+ nghttp2_bufs_free(bufs);
+
+ bufs->head = chain;
+ bufs->cur = bufs->head;
+
+ nghttp2_buf_shift_right(&bufs->cur->buf, bufs->offset);
+
+ bufs->chunk_length = chunk_length;
+ bufs->chunk_used = 1;
+
+ return 0;
+}
+
+void nghttp2_bufs_free(nghttp2_bufs *bufs) {
+ nghttp2_buf_chain *chain, *next_chain;
+
+ if (bufs == NULL) {
+ return;
+ }
+
+ for (chain = bufs->head; chain;) {
+ next_chain = chain->next;
+
+ buf_chain_del(chain, bufs->mem);
+
+ chain = next_chain;
+ }
+
+ bufs->head = NULL;
+}
+
+int nghttp2_bufs_wrap_init(nghttp2_bufs *bufs, uint8_t *begin, size_t len,
+ nghttp2_mem *mem) {
+ nghttp2_buf_chain *chain;
+
+ chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain));
+ if (chain == NULL) {
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ chain->next = NULL;
+
+ nghttp2_buf_wrap_init(&chain->buf, begin, len);
+
+ bufs->mem = mem;
+ bufs->offset = 0;
+
+ bufs->head = chain;
+ bufs->cur = bufs->head;
+
+ bufs->chunk_length = len;
+ bufs->chunk_used = 1;
+ bufs->max_chunk = 1;
+ bufs->chunk_keep = 1;
+
+ return 0;
+}
+
+int nghttp2_bufs_wrap_init2(nghttp2_bufs *bufs, const nghttp2_vec *vec,
+ size_t veclen, nghttp2_mem *mem) {
+ size_t i = 0;
+ nghttp2_buf_chain *cur_chain;
+ nghttp2_buf_chain *head_chain;
+ nghttp2_buf_chain **dst_chain = &head_chain;
+
+ if (veclen == 0) {
+ return nghttp2_bufs_wrap_init(bufs, NULL, 0, mem);
+ }
+
+ head_chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain) * veclen);
+ if (head_chain == NULL) {
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ for (i = 0; i < veclen; ++i) {
+ cur_chain = &head_chain[i];
+ cur_chain->next = NULL;
+ nghttp2_buf_wrap_init(&cur_chain->buf, vec[i].base, vec[i].len);
+
+ *dst_chain = cur_chain;
+ dst_chain = &cur_chain->next;
+ }
+
+ bufs->mem = mem;
+ bufs->offset = 0;
+
+ bufs->head = head_chain;
+ bufs->cur = bufs->head;
+
+ /* We don't use chunk_length since no allocation is expected. */
+ bufs->chunk_length = 0;
+ bufs->chunk_used = veclen;
+ bufs->max_chunk = veclen;
+ bufs->chunk_keep = veclen;
+
+ return 0;
+}
+
+void nghttp2_bufs_wrap_free(nghttp2_bufs *bufs) {
+ if (bufs == NULL) {
+ return;
+ }
+
+ if (bufs->head) {
+ nghttp2_mem_free(bufs->mem, bufs->head);
+ }
+}
+
+void nghttp2_bufs_seek_last_present(nghttp2_bufs *bufs) {
+ nghttp2_buf_chain *ci;
+
+ for (ci = bufs->cur; ci; ci = ci->next) {
+ if (nghttp2_buf_len(&ci->buf) == 0) {
+ return;
+ } else {
+ bufs->cur = ci;
+ }
+ }
+}
+
+size_t nghttp2_bufs_len(nghttp2_bufs *bufs) {
+ nghttp2_buf_chain *ci;
+ size_t len;
+
+ len = 0;
+ for (ci = bufs->head; ci; ci = ci->next) {
+ len += nghttp2_buf_len(&ci->buf);
+ }
+
+ return len;
+}
+
+static int bufs_alloc_chain(nghttp2_bufs *bufs) {
+ int rv;
+ nghttp2_buf_chain *chain;
+
+ if (bufs->cur->next) {
+ bufs->cur = bufs->cur->next;
+
+ return 0;
+ }
+
+ if (bufs->max_chunk == bufs->chunk_used) {
+ return NGHTTP2_ERR_BUFFER_ERROR;
+ }
+
+ rv = buf_chain_new(&chain, bufs->chunk_length, bufs->mem);
+ if (rv != 0) {
+ return rv;
+ }
+
+ DEBUGF("new buffer %zu bytes allocated for bufs %p, used %zu\n",
+ bufs->chunk_length, bufs, bufs->chunk_used);
+
+ ++bufs->chunk_used;
+
+ bufs->cur->next = chain;
+ bufs->cur = chain;
+
+ nghttp2_buf_shift_right(&bufs->cur->buf, bufs->offset);
+
+ return 0;
+}
+
+int nghttp2_bufs_add(nghttp2_bufs *bufs, const void *data, size_t len) {
+ int rv;
+ size_t nwrite;
+ nghttp2_buf *buf;
+ const uint8_t *p;
+
+ p = data;
+
+ while (len) {
+ buf = &bufs->cur->buf;
+
+ nwrite = nghttp2_min(nghttp2_buf_avail(buf), len);
+ if (nwrite == 0) {
+ rv = bufs_alloc_chain(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+ continue;
+ }
+
+ buf->last = nghttp2_cpymem(buf->last, p, nwrite);
+ p += nwrite;
+ len -= nwrite;
+ }
+
+ return 0;
+}
+
+static int bufs_ensure_addb(nghttp2_bufs *bufs) {
+ int rv;
+ nghttp2_buf *buf;
+
+ buf = &bufs->cur->buf;
+
+ if (nghttp2_buf_avail(buf) > 0) {
+ return 0;
+ }
+
+ rv = bufs_alloc_chain(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+
+ return 0;
+}
+
+int nghttp2_bufs_addb(nghttp2_bufs *bufs, uint8_t b) {
+ int rv;
+
+ rv = bufs_ensure_addb(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+
+ *bufs->cur->buf.last++ = b;
+
+ return 0;
+}
+
+int nghttp2_bufs_addb_hold(nghttp2_bufs *bufs, uint8_t b) {
+ int rv;
+
+ rv = bufs_ensure_addb(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+
+ *bufs->cur->buf.last = b;
+
+ return 0;
+}
+
+int nghttp2_bufs_orb(nghttp2_bufs *bufs, uint8_t b) {
+ int rv;
+
+ rv = bufs_ensure_addb(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+
+ *bufs->cur->buf.last++ |= b;
+
+ return 0;
+}
+
+int nghttp2_bufs_orb_hold(nghttp2_bufs *bufs, uint8_t b) {
+ int rv;
+
+ rv = bufs_ensure_addb(bufs);
+ if (rv != 0) {
+ return rv;
+ }
+
+ *bufs->cur->buf.last |= b;
+
+ return 0;
+}
+
+ssize_t nghttp2_bufs_remove(nghttp2_bufs *bufs, uint8_t **out) {
+ size_t len;
+ nghttp2_buf_chain *chain;
+ nghttp2_buf *buf;
+ uint8_t *res;
+ nghttp2_buf resbuf;
+
+ len = 0;
+
+ for (chain = bufs->head; chain; chain = chain->next) {
+ len += nghttp2_buf_len(&chain->buf);
+ }
+
+ if (len == 0) {
+ res = NULL;
+ return 0;
+ }
+
+ res = nghttp2_mem_malloc(bufs->mem, len);
+ if (res == NULL) {
+ return NGHTTP2_ERR_NOMEM;
+ }
+
+ nghttp2_buf_wrap_init(&resbuf, res, len);
+
+ for (chain = bufs->head; chain; chain = chain->next) {
+ buf = &chain->buf;
+ resbuf.last = nghttp2_cpymem(resbuf.last, buf->pos, nghttp2_buf_len(buf));
+ }
+
+ *out = res;
+
+ return (ssize_t)len;
+}
+
+size_t nghttp2_bufs_remove_copy(nghttp2_bufs *bufs, uint8_t *out) {
+ size_t len;
+ nghttp2_buf_chain *chain;
+ nghttp2_buf *buf;
+ nghttp2_buf resbuf;
+
+ len = nghttp2_bufs_len(bufs);
+
+ nghttp2_buf_wrap_init(&resbuf, out, len);
+
+ for (chain = bufs->head; chain; chain = chain->next) {
+ buf = &chain->buf;
+ resbuf.last = nghttp2_cpymem(resbuf.last, buf->pos, nghttp2_buf_len(buf));
+ }
+
+ return len;
+}
+
+void nghttp2_bufs_reset(nghttp2_bufs *bufs) {
+ nghttp2_buf_chain *chain, *ci;
+ size_t k;
+
+ k = bufs->chunk_keep;
+
+ for (ci = bufs->head; ci; ci = ci->next) {
+ nghttp2_buf_reset(&ci->buf);
+ nghttp2_buf_shift_right(&ci->buf, bufs->offset);
+
+ if (--k == 0) {
+ break;
+ }
+ }
+
+ if (ci) {
+ chain = ci->next;
+ ci->next = NULL;
+
+ for (ci = chain; ci;) {
+ chain = ci->next;
+
+ buf_chain_del(ci, bufs->mem);
+
+ ci = chain;
+ }
+
+ bufs->chunk_used = bufs->chunk_keep;
+ }
+
+ bufs->cur = bufs->head;
+}
+
+int nghttp2_bufs_advance(nghttp2_bufs *bufs) { return bufs_alloc_chain(bufs); }
+
+int nghttp2_bufs_next_present(nghttp2_bufs *bufs) {
+ nghttp2_buf_chain *chain;
+
+ chain = bufs->cur->next;
+
+ return chain && nghttp2_buf_len(&chain->buf);
+}
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