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Lib: mostly rewritten CBOR encoder
This commit is contained in:
Maria Matejka
parent
139355e7ab
commit
ccfc127505
@ -1,4 +1,4 @@
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src := bitmap.c bitops.c blake2s.c blake2b.c cbor.c cbor-parser.c cbor_parse_tools.c cbor_shortcuts.c checksum.c defer.c event.c flowspec.c idm.c ip.c lists.c lockfree.c mac.c md5.c mempool.c net.c netindex.c patmatch.c printf.c rcu.c resource.c runtime.c sha1.c sha256.c sha512.c slab.c slists.c strtoul.c tbf.c timer.c xmalloc.c
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src := bitmap.c bitops.c blake2s.c blake2b.c cbor.c cbor-parser.c checksum.c defer.c event.c flowspec.c idm.c ip.c lists.c lockfree.c mac.c md5.c mempool.c net.c netindex.c patmatch.c printf.c rcu.c resource.c runtime.c sha1.c sha256.c sha512.c slab.c slists.c strtoul.c tbf.c timer.c xmalloc.c
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obj := $(src-o-files)
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$(all-lib)
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179
lib/cbor.c
179
lib/cbor.c
@ -3,6 +3,7 @@
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#include "lib/cbor.h"
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/* String versions of type constants */
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static const char *cbor_type_str_a[] = {
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"POSINT",
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"NEGINT",
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@ -22,62 +23,179 @@ cbor_type_str(enum cbor_basic_type t)
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tmp_sprintf("(unknown: %u)", t);
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}
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void write_item(struct cbor_writer *writer, uint8_t major, uint64_t num);
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void check_memory(struct cbor_writer *writer, int add_size);
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/* Raw data writing */
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struct cbor_writer *cbor_init(uint8_t *buff, uint32_t capacity, struct linpool *lp)
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bool cbor_put_check(struct cbor_writer *w, u64 amount)
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{
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struct cbor_writer *writer = (struct cbor_writer*)lp_alloc(lp, sizeof(struct cbor_writer));
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writer->cbor = buff;
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writer->capacity = capacity;
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writer->pt = 0;
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writer->lp = lp;
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return writer;
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return w->data.pos + amount <= w->data.end;
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}
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void cbor_open_block(struct cbor_writer *writer) { // We will need to close the block later manualy
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check_memory(writer, 2);
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writer->cbor[writer->pt] = 0xbf;
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writer->pt++;
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#define CBOR_PUT(amount) ({ \
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byte *put = w->data.pos; \
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if ((w->data.pos += (amount)) >= w->data.end) return false; \
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put; })
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bool cbor_put_raw_u8(struct cbor_writer *w, byte b)
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{
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*(CBOR_PUT(1)) = b;
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return true;
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}
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void cbor_open_list(struct cbor_writer *writer)
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bool cbor_put_raw_u16(struct cbor_writer *w, u16 val)
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{
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check_memory(writer, 2);
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writer->cbor[writer->pt] = 0x9f;
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writer->pt++;
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put_u16(CBOR_PUT(2), val);
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return true;
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}
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void cbor_close_block_or_list(struct cbor_writer *writer)
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bool cbor_put_raw_u32(struct cbor_writer *w, u32 val)
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{
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check_memory(writer, 2);
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writer->cbor[writer->pt] = 0xff;
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writer->pt++;
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put_u32(CBOR_PUT(4), val);
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return true;
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}
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void cbor_open_block_with_length(struct cbor_writer *writer, uint32_t length)
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bool cbor_put_raw_u64(struct cbor_writer *w, u64 val)
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{
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write_item(writer, 5, length);
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put_u64(CBOR_PUT(8), val);
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return true;
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}
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void cbor_open_list_with_length(struct cbor_writer *writer, uint32_t length)
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bool cbor_put_raw_data(struct cbor_writer *w, const byte *block, u64 size)
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{
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write_item(writer, 4, length);
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memcpy(CBOR_PUT(size), block, size);
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return true;
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}
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void cbor_add_int(struct cbor_writer *writer, int64_t item)
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/* Basic value putting */
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bool cbor_put(struct cbor_writer *w, enum cbor_basic_type type, u64 value)
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{
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if (item >= 0)
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ASSERT_DIE((type >= 0) && (type <= 8));
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w->stack[w->stack_pos].items++;
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byte tt = type << 5;
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if (value < 0x18)
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return
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cbor_put_raw_u8(w, tt | value);
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else if (value < 0x100)
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return
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cbor_put_raw_u8(w, tt | 0x18) &&
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cbor_put_raw_u8(w, value);
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else if (value < 0x10000)
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return
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cbor_put_raw_u8(w, tt | 0x19) &&
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cbor_put_raw_u16(w, value);
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else if (value < 0x100000000)
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return
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cbor_put_raw_u8(w, tt | 0x1a) &&
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cbor_put_raw_u32(w, value);
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else
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return
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cbor_put_raw_u8(w, tt | 0x1b) &&
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cbor_put_raw_u64(w, value);
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}
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bool cbor_put_int(struct cbor_writer *w, int64_t value)
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{
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if (value >= 0)
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return cbor_put(w, CBOR_POSINT, value);
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else
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return cbor_put(w, CBOR_NEGINT, -1-value);
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}
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/* Strings */
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bool cbor_put_raw_bytes(struct cbor_writer *w, enum cbor_basic_type type, const byte *block, u64 size)
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{
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return
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cbor_put(w, type, size) &&
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cbor_put_raw_data(w, block, size);
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}
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/* Arrays and maps */
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bool cbor_put_open(struct cbor_writer *w, enum cbor_basic_type type)
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{
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if (++w->stack_pos >= w->stack_max)
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return false;
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w->stack[w->stack_pos].head = w->data.pos;
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w->stack[w->stack_pos].items = 0;
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return cbor_put(w, type, ~0ULL);
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}
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bool cbor_put_close(struct cbor_writer *w, u64 actual_size, bool strict)
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{
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ASSERT_DIE(w->stack_pos > 0);
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/* Pop the stack */
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byte *head = w->stack[w->stack_pos].head;
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u64 items = w->stack[w->stack_pos].items;
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w->stack_pos--;
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/* Check the original head position */
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ASSERT_DIE((head[0] & 0x1f) == 0x1f);
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ASSERT_DIE(w->data.pos >= w->data.start + 9);
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switch (head[0] >> 5)
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{
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write_item(writer, 0, item); // 0 is the "major" (three bits) introducing positive int, 1 is for negative
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case CBOR_ARRAY:
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if (strict && (items != actual_size))
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bug("Inconsistent array item count");
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break;
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case CBOR_MAP:
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if (strict && (items != actual_size * 2))
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bug("Inconsistent map item count");
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else if (items & 1)
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bug("Trailing map key");
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else
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items /= 2;
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break;
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default:
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bug("Head points to something other than array or map");
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}
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/* Move the data back */
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if (items < 0x18)
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{
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memmove(head+1, head+9, w->data.pos - (head+9));
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head[0] &= (0xe0 | items);
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w->data.pos -= 8;
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}
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else if (items < 0x100)
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{
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memmove(head+2, head+9, w->data.pos - (head+9));
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head[0] &= 0xf8;
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head[1] = items;
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w->data.pos -= 7;
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}
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else if (items < 0x10000)
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{
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memmove(head+3, head+9, w->data.pos - (head+9));
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head[0] &= 0xf9;
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put_u16(head+1, items);
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w->data.pos -= 6;
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}
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else if (items < 0x100000000)
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{
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memmove(head+5, head+9, w->data.pos - (head+9));
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head[0] &= 0xfa;
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put_u32(head+1, items);
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w->data.pos -= 4;
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}
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else
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{
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write_item(writer, 1, -item - 1);
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head[0] &= 0xfb;
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put_u64(head+1, items);
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}
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return true;
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}
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/* Tags: TODO! */
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#if 0
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void cbor_epoch_time(struct cbor_writer *writer, int64_t time, int shift)
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{
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write_item(writer, 6, 1); // 6 is TAG, 1 is tag number for epoch time
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@ -253,3 +371,4 @@ void check_memory(struct cbor_writer *writer, int add_size)
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bug("There is not enough space for cbor response in given buffer");
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}
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}
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#endif
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86
lib/cbor.h
86
lib/cbor.h
@ -3,6 +3,10 @@
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#include "nest/bird.h"
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/**
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* CBOR Commonalities
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**/
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enum cbor_basic_type {
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CBOR_POSINT = 0,
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CBOR_NEGINT = 1,
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@ -16,27 +20,78 @@ enum cbor_basic_type {
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const char *cbor_type_str(enum cbor_basic_type);
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/**
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* CBOR Writer
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**/
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struct cbor_writer {
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int pt; // where will next byte go
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int capacity;
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int8_t *cbor;
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struct linpool *lp;
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buffer data;
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uint stack_pos, stack_max; /* Nesting of CBOR_ARRAY / CBOR_MAP */
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struct cbor_writer_stack_item {
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u64 items;
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byte *head;
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} stack[0];
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};
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/* Initialization */
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static inline struct cbor_writer *cbor_writer_init(struct cbor_writer *w, uint stack_max_depth, byte *buf, uint size)
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{
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*w = (struct cbor_writer) {
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.data = {
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.start = buf,
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.pos = buf,
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.end = buf + size,
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},
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.stack_max = stack_max_depth,
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};
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return w;
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}
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struct cbor_writer *cbor_init(uint8_t *buff, uint32_t capacity, struct linpool *lp);
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void cbor_open_block(struct cbor_writer *writer);
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void cbor_open_list(struct cbor_writer *writer);
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void cbor_close_block_or_list(struct cbor_writer *writer);
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void cbor_open_block_with_length(struct cbor_writer *writer, uint32_t length);
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void cbor_open_list_with_length(struct cbor_writer *writer, uint32_t length);
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#define cbor_writer_new(p, smax, buf, size) cbor_writer_init(mb_alloc((p), sizeof(struct cbor_writer) + (smax) * sizeof(struct cbor_writer_stack_item)), (smax), (buf), (size))
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/* Return how many items have been encoded */
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static inline int cbor_writer_done(struct cbor_writer *w)
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{
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if (w->stack_pos > 0)
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return -1;
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else
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return w->stack[0].items;
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}
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/* Integer types */
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bool cbor_put(struct cbor_writer *w, enum cbor_basic_type type, u64 value);
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#define cbor_put_posint(w,v) cbor_put((w), CBOR_POSINT, (v))
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#define cbor_put_negint(w,v) cbor_put((w), CBOR_NEGINT, -1-(v))
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bool cbor_put_int(struct cbor_writer *w, int64_t value);
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/* String types */
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bool cbor_put_raw_bytes(struct cbor_writer *w, enum cbor_basic_type type, const byte *block, u64 size);
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#define cbor_put_bytes(w, b, s) cbor_put_raw_bytes((w), CBOR_BYTES, (b), (s))
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#define cbor_put_text(w, b, s) cbor_put_raw_bytes((w), CBOR_TEXT, (b), (s))
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#define cbor_put_string(w, s) cbor_put_raw_bytes((w), CBOR_TEXT, (s), strlen(s))
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#define cbor_put_toks(w, s) cbor_put_raw_bytes((w), CBOR_TEXT, #s, sizeof #s)
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/* Compound types */
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bool cbor_put_open(struct cbor_writer *w, enum cbor_basic_type type);
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bool cbor_put_close(struct cbor_writer *w, u64 actual_size, bool strict);
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#define cbor_open_array(w) cbor_put_open((w), CBOR_ARRAY)
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#define cbor_open_map(w) cbor_put_open((w), CBOR_MAP)
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#define cbor_close_array(w) cbor_put_close((w), 0, 0)
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#define cbor_close_map(w) cbor_put_close((w), 0, 0)
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#define CBOR_PUT_ARRAY(w) for (struct cbor_writer *_w = w, *_ww = cbor_open_array(_w) ? (_w) : (bug("buffer overflow on CBOR_ARRAY"), NULL); (_w = NULL), _ww; cbor_close_array(_ww), _ww = NULL)
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#define CBOR_PUT_MAP(w) for (struct cbor_writer *_w = w, *_ww = cbor_open_map(_w) ? (_w) : (bug("buffer overflow on CBOR_MAP"), NULL); (_w = NULL), _ww; cbor_close_map(_ww), _ww = NULL)
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/* Specials */
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#define cbor_put_false(w) cbor_put((w), CBOR_SPECIAL, 20);
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#define cbor_put_true(w) cbor_put((w), CBOR_SPECIAL, 21);
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#define cbor_put_null(w) cbor_put((w), CBOR_SPECIAL, 22);
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#define cbor_put_undef(w) cbor_put((w), CBOR_SPECIAL, 23);
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#if 0
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void cbor_add_int(struct cbor_writer *writer, int64_t item);
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void cbor_add_ipv4(struct cbor_writer *writer, ip4_addr);
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@ -66,6 +121,7 @@ void write_item(struct cbor_writer *writer, uint8_t major, uint64_t num);
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void cbor_write_item_with_constant_val_length_4(struct cbor_writer *writer, uint8_t major, uint64_t num);
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void rewrite_4bytes_int(struct cbor_writer *writer, int pt, int num);
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#endif
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/*
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* Parser bits
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