1 files changed, 85 insertions, 0 deletions
diff --git a/libnetdata/buffer/buffer.h b/libnetdata/buffer/buffer.h
new file mode 100644
index 000000000..8e431bfd5
--- /dev/null
+++ b/libnetdata/buffer/buffer.h
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_BUFFER_H
+#define NETDATA_WEB_BUFFER_H 1
+
+#include "../libnetdata.h"
+
+#define WEB_DATA_LENGTH_INCREASE_STEP 1024
+
+typedef struct web_buffer {
+    size_t size;        	// allocation size of buffer, in bytes
+    size_t len;     		// current data length in buffer, in bytes
+    char *buffer;   		// the buffer itself
+    uint8_t contenttype;	// the content type of the data in the buffer
+    uint8_t options;		// options related to the content
+    time_t date;    		// the timestamp this content has been generated
+    time_t expires;			// the timestamp this content expires
+} BUFFER;
+
+// options
+#define WB_CONTENT_CACHEABLE            1
+#define WB_CONTENT_NO_CACHEABLE         2
+
+// content-types
+#define CT_APPLICATION_JSON             1
+#define CT_TEXT_PLAIN                   2
+#define CT_TEXT_HTML                    3
+#define CT_APPLICATION_X_JAVASCRIPT     4
+#define CT_TEXT_CSS                     5
+#define CT_TEXT_XML                     6
+#define CT_APPLICATION_XML              7
+#define CT_TEXT_XSL                     8
+#define CT_APPLICATION_OCTET_STREAM     9
+#define CT_APPLICATION_X_FONT_TRUETYPE  10
+#define CT_APPLICATION_X_FONT_OPENTYPE  11
+#define CT_APPLICATION_FONT_WOFF        12
+#define CT_APPLICATION_FONT_WOFF2       13
+#define CT_APPLICATION_VND_MS_FONTOBJ   14
+#define CT_IMAGE_SVG_XML                15
+#define CT_IMAGE_PNG                    16
+#define CT_IMAGE_JPG                    17
+#define CT_IMAGE_GIF                    18
+#define CT_IMAGE_XICON                  19
+#define CT_IMAGE_ICNS                   20
+#define CT_IMAGE_BMP                    21
+#define CT_PROMETHEUS                   22
+
+#define buffer_cacheable(wb)    do { (wb)->options |= WB_CONTENT_CACHEABLE;    if((wb)->options & WB_CONTENT_NO_CACHEABLE) (wb)->options &= ~WB_CONTENT_NO_CACHEABLE; } while(0)
+#define buffer_no_cacheable(wb) do { (wb)->options |= WB_CONTENT_NO_CACHEABLE; if((wb)->options & WB_CONTENT_CACHEABLE)    (wb)->options &= ~WB_CONTENT_CACHEABLE;  (wb)->expires = 0; } while(0)
+
+#define buffer_strlen(wb) ((wb)->len)
+extern const char *buffer_tostring(BUFFER *wb);
+
+#define buffer_flush(wb) wb->buffer[(wb)->len = 0] = '\0'
+extern void buffer_reset(BUFFER *wb);
+
+extern void buffer_strcat(BUFFER *wb, const char *txt);
+extern void buffer_rrd_value(BUFFER *wb, calculated_number value);
+
+extern void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds);
+extern void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds);
+
+extern BUFFER *buffer_create(size_t size);
+extern void buffer_free(BUFFER *b);
+extern void buffer_increase(BUFFER *b, size_t free_size_required);
+
+extern void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...) PRINTFLIKE(3, 4);
+extern void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args);
+extern void buffer_sprintf(BUFFER *wb, const char *fmt, ...) PRINTFLIKE(2,3);
+extern void buffer_strcat_htmlescape(BUFFER *wb, const char *txt);
+
+extern void buffer_char_replace(BUFFER *wb, char from, char to);
+
+extern char *print_number_lu_r(char *str, unsigned long uvalue);
+extern char *print_number_llu_r(char *str, unsigned long long uvalue);
+extern char *print_number_llu_r_smart(char *str, unsigned long long uvalue);
+
+extern void buffer_print_llu(BUFFER *wb, unsigned long long uvalue);
+
+static inline void buffer_need_bytes(BUFFER *buffer, size_t needed_free_size) {
+    if(unlikely(buffer->size - buffer->len < needed_free_size))
+        buffer_increase(buffer, needed_free_size);
+}
+
+#endif /* NETDATA_WEB_BUFFER_H */