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-rw-r--r--src/node.c387
1 files changed, 387 insertions, 0 deletions
diff --git a/src/node.c b/src/node.c
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+++ b/src/node.c
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+/*
+ Copyright 2011-2016 David Robillard <http://drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "serd_internal.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <math.h>
+#include <float.h>
+
+#ifdef _WIN32
+# ifndef isnan
+# define isnan(x) _isnan(x)
+# endif
+# ifndef isinf
+# define isinf(x) (!_finite(x))
+# endif
+#endif
+
+SerdNode
+serd_node_from_string(SerdType type, const uint8_t* str)
+{
+ if (!str) {
+ return SERD_NODE_NULL;
+ }
+
+ uint32_t flags = 0;
+ size_t buf_n_bytes = 0;
+ const size_t buf_n_chars = serd_strlen(str, &buf_n_bytes, &flags);
+ SerdNode ret = { str, buf_n_bytes, buf_n_chars, flags, type };
+ return ret;
+}
+
+SerdNode
+serd_node_from_substring(SerdType type, const uint8_t* str, const size_t len)
+{
+ if (!str) {
+ return SERD_NODE_NULL;
+ }
+
+ uint32_t flags = 0;
+ size_t buf_n_bytes = 0;
+ const size_t buf_n_chars = serd_substrlen(str, len, &buf_n_bytes, &flags);
+ assert(buf_n_bytes <= len);
+ SerdNode ret = { str, buf_n_bytes, buf_n_chars, flags, type };
+ return ret;
+}
+
+SerdNode
+serd_node_copy(const SerdNode* node)
+{
+ if (!node || !node->buf) {
+ return SERD_NODE_NULL;
+ }
+
+ SerdNode copy = *node;
+ uint8_t* buf = (uint8_t*)malloc(copy.n_bytes + 1);
+ memcpy(buf, node->buf, copy.n_bytes + 1);
+ copy.buf = buf;
+ return copy;
+}
+
+bool
+serd_node_equals(const SerdNode* a, const SerdNode* b)
+{
+ return (a == b)
+ || (a->type == b->type
+ && a->n_bytes == b->n_bytes
+ && a->n_chars == b->n_chars
+ && ((a->buf == b->buf) || !memcmp((const char*)a->buf,
+ (const char*)b->buf,
+ a->n_bytes + 1)));
+}
+
+static size_t
+serd_uri_string_length(const SerdURI* uri)
+{
+ size_t len = uri->path_base.len;
+
+#define ADD_LEN(field, n_delims) \
+ if ((field).len) { len += (field).len + (n_delims); }
+
+ ADD_LEN(uri->path, 1); // + possible leading `/'
+ ADD_LEN(uri->scheme, 1); // + trailing `:'
+ ADD_LEN(uri->authority, 2); // + leading `//'
+ ADD_LEN(uri->query, 1); // + leading `?'
+ ADD_LEN(uri->fragment, 1); // + leading `#'
+
+ return len + 2; // + 2 for authority `//'
+}
+
+static size_t
+string_sink(const void* buf, size_t len, void* stream)
+{
+ uint8_t** ptr = (uint8_t**)stream;
+ memcpy(*ptr, buf, len);
+ *ptr += len;
+ return len;
+}
+
+SerdNode
+serd_node_new_uri_from_node(const SerdNode* uri_node,
+ const SerdURI* base,
+ SerdURI* out)
+{
+ return (uri_node->type == SERD_URI && uri_node->buf)
+ ? serd_node_new_uri_from_string(uri_node->buf, base, out)
+ : SERD_NODE_NULL;
+}
+
+SerdNode
+serd_node_new_uri_from_string(const uint8_t* str,
+ const SerdURI* base,
+ SerdURI* out)
+{
+ if (!str || str[0] == '\0') {
+ // Empty URI => Base URI, or nothing if no base is given
+ return base ? serd_node_new_uri(base, NULL, out) : SERD_NODE_NULL;
+ }
+
+ SerdURI uri;
+ serd_uri_parse(str, &uri);
+ return serd_node_new_uri(&uri, base, out); // Resolve/Serialise
+}
+
+static inline bool
+is_uri_path_char(const uint8_t c)
+{
+ if (is_alpha(c) || is_digit(c)) {
+ return true;
+ }
+ switch (c) {
+ case '-': case '.': case '_': case '~': // unreserved
+ case ':': case '@': // pchar
+ case '/': // separator
+ // sub-delims
+ case '!': case '$': case '&': case '\'': case '(': case ')':
+ case '*': case '+': case ',': case ';': case '=':
+ return true;
+ default:
+ return false;
+ }
+}
+
+SerdNode
+serd_node_new_file_uri(const uint8_t* path,
+ const uint8_t* hostname,
+ SerdURI* out,
+ bool escape)
+{
+ const size_t path_len = strlen((const char*)path);
+ const size_t hostname_len = hostname ? strlen((const char*)hostname) : 0;
+ const bool evil = is_windows_path(path);
+ size_t uri_len = 0;
+ uint8_t* uri = NULL;
+
+ if (path[0] == '/' || is_windows_path(path)) {
+ uri_len = strlen("file://") + hostname_len + evil;
+ uri = (uint8_t*)malloc(uri_len + 1);
+ snprintf((char*)uri, uri_len + 1, "file://%s%s",
+ hostname ? (const char*)hostname : "",
+ evil ? "/" : "");
+ }
+
+ SerdChunk chunk = { uri, uri_len };
+ for (size_t i = 0; i < path_len; ++i) {
+ if (evil && path[i] == '\\') {
+ serd_chunk_sink("/", 1, &chunk);
+ } else if (path[i] == '%') {
+ serd_chunk_sink("%%", 2, &chunk);
+ } else if (!escape || is_uri_path_char(path[i])) {
+ serd_chunk_sink(path + i, 1, &chunk);
+ } else {
+ char escape_str[4] = { '%', 0, 0, 0 };
+ snprintf(escape_str + 1, sizeof(escape_str) - 1, "%X", path[i]);
+ serd_chunk_sink(escape_str, 3, &chunk);
+ }
+ }
+ serd_chunk_sink_finish(&chunk);
+
+ if (out) {
+ serd_uri_parse(chunk.buf, out);
+ }
+
+ return serd_node_from_substring(SERD_URI, chunk.buf, chunk.len);
+}
+
+SerdNode
+serd_node_new_uri(const SerdURI* uri, const SerdURI* base, SerdURI* out)
+{
+ SerdURI abs_uri = *uri;
+ if (base) {
+ serd_uri_resolve(uri, base, &abs_uri);
+ }
+
+ const size_t len = serd_uri_string_length(&abs_uri);
+ uint8_t* buf = (uint8_t*)malloc(len + 1);
+ SerdNode node = { buf, 0, 0, 0, SERD_URI };
+ uint8_t* ptr = buf;
+ const size_t actual_len = serd_uri_serialise(&abs_uri, string_sink, &ptr);
+
+ buf[actual_len] = '\0';
+ node.n_bytes = actual_len;
+ node.n_chars = serd_strlen(buf, NULL, NULL);
+
+ if (out) {
+ serd_uri_parse(buf, out); // TODO: cleverly avoid double parse
+ }
+
+ return node;
+}
+
+SerdNode
+serd_node_new_relative_uri(const SerdURI* uri,
+ const SerdURI* base,
+ const SerdURI* root,
+ SerdURI* out)
+{
+ const size_t uri_len = serd_uri_string_length(uri);
+ const size_t base_len = serd_uri_string_length(base);
+ uint8_t* buf = (uint8_t*)malloc(uri_len + base_len + 1);
+ SerdNode node = { buf, 0, 0, 0, SERD_URI };
+ uint8_t* ptr = buf;
+ const size_t actual_len = serd_uri_serialise_relative(
+ uri, base, root, string_sink, &ptr);
+
+ buf[actual_len] = '\0';
+ node.n_bytes = actual_len;
+ node.n_chars = serd_strlen(buf, NULL, NULL);
+
+ if (out) {
+ serd_uri_parse(buf, out); // TODO: cleverly avoid double parse
+ }
+
+ return node;
+}
+
+static inline unsigned
+serd_digits(double abs)
+{
+ const double lg = ceil(log10(floor(abs) + 1.0));
+ return lg < 1.0 ? 1U : (unsigned)lg;
+}
+
+SerdNode
+serd_node_new_decimal(double d, unsigned frac_digits)
+{
+ if (isnan(d) || isinf(d)) {
+ return SERD_NODE_NULL;
+ }
+
+ const double abs_d = fabs(d);
+ const unsigned int_digits = serd_digits(abs_d);
+ char* buf = (char*)calloc(int_digits + frac_digits + 3, 1);
+ SerdNode node = { (const uint8_t*)buf, 0, 0, 0, SERD_LITERAL };
+ const double int_part = floor(abs_d);
+
+ // Point s to decimal point location
+ char* s = buf + int_digits;
+ if (d < 0.0) {
+ *buf = '-';
+ ++s;
+ }
+
+ // Write integer part (right to left)
+ char* t = s - 1;
+ uint64_t dec = (uint64_t)int_part;
+ do {
+ *t-- = '0' + (dec % 10);
+ } while ((dec /= 10) > 0);
+
+ *s++ = '.';
+
+ // Write fractional part (right to left)
+ double frac_part = fabs(d - int_part);
+ if (frac_part < DBL_EPSILON) {
+ *s++ = '0';
+ node.n_bytes = node.n_chars = (s - buf);
+ } else {
+ uint64_t frac = frac_part * pow(10.0, (int)frac_digits) + 0.5;
+ s += frac_digits - 1;
+ unsigned i = 0;
+
+ // Skip trailing zeros
+ for (; i < frac_digits - 1 && !(frac % 10); ++i, --s, frac /= 10) {}
+
+ node.n_bytes = node.n_chars = (s - buf) + 1;
+
+ // Write digits from last trailing zero to decimal point
+ for (; i < frac_digits; ++i) {
+ *s-- = '0' + (frac % 10);
+ frac /= 10;
+ }
+ }
+
+ return node;
+}
+
+SerdNode
+serd_node_new_integer(int64_t i)
+{
+ int64_t abs_i = (i < 0) ? -i : i;
+ const unsigned digits = serd_digits(abs_i);
+ char* buf = (char*)calloc(digits + 2, 1);
+ SerdNode node = { (const uint8_t*)buf, 0, 0, 0, SERD_LITERAL };
+
+ // Point s to the end
+ char* s = buf + digits - 1;
+ if (i < 0) {
+ *buf = '-';
+ ++s;
+ }
+
+ node.n_bytes = node.n_chars = (s - buf) + 1;
+
+ // Write integer part (right to left)
+ do {
+ *s-- = '0' + (abs_i % 10);
+ } while ((abs_i /= 10) > 0);
+
+ return node;
+}
+
+/**
+ Base64 encoding table.
+ @see <a href="http://tools.ietf.org/html/rfc3548#section-3">RFC3986 S3</a>.
+*/
+static const uint8_t b64_map[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+/**
+ Encode 3 raw bytes to 4 base64 characters.
+*/
+static inline void
+encode_chunk(uint8_t out[4], const uint8_t in[3], size_t n_in)
+{
+ out[0] = b64_map[in[0] >> 2];
+ out[1] = b64_map[((in[0] & 0x03) << 4) | ((in[1] & 0xF0) >> 4)];
+ out[2] = ((n_in > 1)
+ ? (b64_map[((in[1] & 0x0F) << 2) | ((in[2] & 0xC0) >> 6)])
+ : (uint8_t)'=');
+ out[3] = ((n_in > 2) ? b64_map[in[2] & 0x3F] : (uint8_t)'=');
+}
+
+SerdNode
+serd_node_new_blob(const void* buf, size_t size, bool wrap_lines)
+{
+ const size_t len = (size + 2) / 3 * 4 + (wrap_lines * ((size - 1) / 57));
+ uint8_t* str = (uint8_t*)calloc(len + 2, 1);
+ SerdNode node = { str, len, len, 0, SERD_LITERAL };
+ for (size_t i = 0, j = 0; i < size; i += 3, j += 4) {
+ uint8_t in[4] = { 0, 0, 0, 0 };
+ size_t n_in = MIN(3, size - i);
+ memcpy(in, (const uint8_t*)buf + i, n_in);
+
+ if (wrap_lines && i > 0 && (i % 57) == 0) {
+ str[j++] = '\n';
+ node.flags |= SERD_HAS_NEWLINE;
+ }
+
+ encode_chunk(str + j, in, n_in);
+ }
+ return node;
+}
+
+void
+serd_node_free(SerdNode* node)
+{
+ if (node && node->buf) {
+ free((uint8_t*)node->buf);
+ node->buf = NULL;
+ }
+}
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