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#include "input_buffer.h"
#include <assert.h>
#include <string.h>
enum { KIT_IB_CACHE_SIZE = 256 };
static s32 kit_buf_adjust_(kit_input_buffer_t *buf, i64 size) {
assert(buf != NULL);
assert(size >= 0);
if (buf == NULL)
return KIT_ERROR_INTERNAL;
i64 offset = buf->data.size;
if (offset >= size)
return KIT_OK;
DA_RESIZE(buf->data, size);
if (buf->data.size != size)
return KIT_ERROR_OUT_OF_MEMORY;
str_t destination = { .size = size - offset,
.values = buf->data.values + offset };
i64 n = IS_READ(buf->upstream, destination);
DA_RESIZE(buf->data, offset + n);
if (buf->data.size != offset + n)
return KIT_ERROR_OUT_OF_MEMORY;
return KIT_OK;
}
kit_input_buffer_t kit_ib_init(is_handle_t upstream,
kit_allocator_t *alloc) {
kit_input_buffer_t buf;
memset(&buf, 0, sizeof buf);
buf.upstream = upstream;
DA_INIT(buf.data, 0, alloc);
return buf;
}
void kit_ib_destroy(kit_input_buffer_t *buf) {
assert(buf != NULL);
if (buf == NULL)
return;
DA_DESTROY(buf->data);
memset(buf, 0, sizeof *buf);
}
kit_ib_token_t kit_ib_token(kit_input_buffer_t *buf) {
return (kit_ib_token_t) {
.status = KIT_OK, .offset = 0, .size = 0, .buffer = buf
};
}
kit_str_t kit_ib_str(kit_ib_token_t tok) {
assert(tok.buffer != NULL);
if (tok.buffer == NULL || tok.buffer->data.values == NULL)
return (str_t) { .size = 0, .values = NULL };
return (str_t) { .size = tok.size,
.values = tok.buffer->data.values + tok.offset };
}
kit_ib_token_t kit_ib_read(kit_ib_token_t tok, i64 size) {
assert(tok.buffer != NULL);
kit_ib_token_t next = tok;
next.offset = tok.offset + tok.size;
next.size = 0;
if (tok.status != KIT_OK)
return next;
if (tok.buffer == NULL) {
next.status = KIT_ERROR_INVALID_ARGUMENT;
return next;
}
s32 s = kit_buf_adjust_(tok.buffer, tok.offset + tok.size + size);
if (s != KIT_OK) {
next.status = s;
return next;
}
assert(tok.buffer->data.values != NULL);
if (tok.buffer->data.values == NULL) {
next.status = KIT_ERROR_INTERNAL;
return next;
}
next.size = size < tok.buffer->data.size - tok.offset - tok.size
? size
: tok.buffer->data.size - tok.offset - tok.size;
return next;
}
#define IB_CACHE_INIT_(res_) \
str_builder_t cache_dynamic; \
memset(&cache_dynamic, 0, sizeof cache_dynamic); \
char cache_static[KIT_IB_CACHE_SIZE]; \
\
do { \
if (data.size > 0) { \
if (data.size < KIT_IB_CACHE_SIZE) { \
memcpy(cache_static, data.values, data.size); \
data.values = cache_static; \
} else { \
DA_INIT(cache_dynamic, data.size, tok.buffer->data.alloc); \
if (cache_dynamic.size != data.size) { \
(res_).status |= KIT_ERROR_OUT_OF_MEMORY; \
return (res_); \
} \
memcpy(cache_dynamic.values, data.values, data.size); \
data.values = cache_dynamic.values; \
} \
} \
} while (0)
#define IB_CACHE_CLEANUP_() \
do { \
if (cache_dynamic.values != NULL) \
DA_DESTROY(cache_dynamic); \
} while (0)
kit_ib_token_t kit_ib_any(kit_ib_token_t tok, str_t data) {
assert(tok.buffer != NULL);
kit_ib_token_t next = tok;
next.offset = tok.offset + tok.size;
next.size = 0;
if (tok.status != KIT_OK)
return next;
if (tok.buffer == NULL) {
next.status = KIT_ERROR_INVALID_ARGUMENT;
return next;
}
IB_CACHE_INIT_(next);
for (;; ++next.size) {
s32 s = kit_buf_adjust_(tok.buffer,
tok.offset + tok.size + next.size + 1);
if (s != KIT_OK) {
next.status = s;
return next;
}
assert(tok.buffer->data.values != NULL);
if (tok.buffer->data.values == NULL) {
next.status = KIT_ERROR_INTERNAL;
return next;
}
if (tok.offset + tok.size + next.size >= tok.buffer->data.size)
break;
i8 found = 0;
for (i64 i = 0; i < data.size; i++)
if (data.values[i] ==
tok.buffer->data.values[next.offset + next.size]) {
found = 1;
break;
}
if (!found)
break;
}
IB_CACHE_CLEANUP_();
return next;
}
kit_ib_token_t kit_ib_none(kit_ib_token_t tok, str_t data) {
assert(tok.buffer != NULL);
kit_ib_token_t next = tok;
next.offset = tok.offset + tok.size;
next.size = 0;
if (tok.status != KIT_OK)
return next;
if (tok.buffer == NULL) {
next.status = KIT_ERROR_INVALID_ARGUMENT;
return next;
}
IB_CACHE_INIT_(next);
for (;; ++next.size) {
s32 s = kit_buf_adjust_(tok.buffer,
tok.offset + tok.size + next.size + 1);
if (s != KIT_OK) {
next.status = s;
return next;
}
assert(tok.buffer->data.values != NULL);
if (tok.buffer->data.values == NULL) {
next.status = KIT_ERROR_INTERNAL;
return next;
}
if (tok.offset + tok.size + next.size >= tok.buffer->data.size)
break;
i8 found = 0;
for (i64 i = 0; i < data.size; i++)
if (data.values[i] ==
tok.buffer->data.values[next.offset + next.size]) {
found = 1;
break;
}
if (found)
break;
}
IB_CACHE_CLEANUP_();
return next;
}
kit_ib_token_t kit_ib_exact(kit_ib_token_t tok, str_t data) {
kit_ib_token_t res = tok;
res.offset = tok.offset + tok.size;
res.size = 0;
IB_CACHE_INIT_(res);
res = kit_ib_read(tok, data.size);
if (!AR_EQUAL(kit_ib_str(res), data))
res.status = KIT_PARSING_FAILED;
IB_CACHE_CLEANUP_();
return res;
}
kit_ib_token_t kit_ib_until(kit_ib_token_t tok, str_t data) {
assert(tok.buffer != NULL);
kit_ib_token_t next = tok;
next.offset = tok.offset + tok.size;
next.size = 0;
if (tok.status != KIT_OK)
return next;
if (tok.buffer == NULL) {
next.status = KIT_ERROR_INVALID_ARGUMENT;
return next;
}
IB_CACHE_INIT_(next);
for (;; ++next.size) {
s32 s = kit_buf_adjust_(tok.buffer,
tok.offset + tok.size + next.size + 1);
if (s != KIT_OK) {
next.status = s;
return next;
}
assert(tok.buffer->data.values != NULL);
if (tok.buffer->data.values == NULL) {
next.status = KIT_ERROR_INTERNAL;
return next;
}
if (tok.offset + tok.size + next.size >= tok.buffer->data.size)
break;
if (next.size + 1 >= data.size &&
AR_EQUAL(kit_str(data.size, tok.buffer->data.values +
(next.offset + next.size + 1 -
data.size)),
data)) {
next.size -= data.size - 1;
break;
}
}
IB_CACHE_CLEANUP_();
return next;
}
kit_ib_token_t kit_ib_while(kit_ib_token_t tok,
kit_ib_read_condition_fn condition,
void *context) {
assert(tok.buffer != NULL);
kit_ib_token_t next = tok;
next.offset = tok.offset + tok.size;
next.size = 0;
if (tok.status != KIT_OK)
return next;
if (tok.buffer == NULL) {
next.status = KIT_ERROR_INVALID_ARGUMENT;
return next;
}
for (;; ++next.size) {
s32 s = kit_buf_adjust_(tok.buffer,
tok.offset + tok.size + next.size + 1);
if (s != KIT_OK) {
next.status = s;
return next;
}
assert(tok.buffer->data.values != NULL);
if (tok.buffer->data.values == NULL) {
next.status = KIT_ERROR_INTERNAL;
return next;
}
if (tok.offset + tok.size + next.size >= tok.buffer->data.size)
break;
if (condition == NULL ||
!condition(kit_str(next.size + 1,
tok.buffer->data.values + next.offset),
context))
break;
}
return next;
}
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