diff --git a/buffer/4coder_buffer_abstract.cpp b/buffer/4coder_buffer_abstract.cpp
index b6bca77c..38d6d0dd 100644
--- a/buffer/4coder_buffer_abstract.cpp
+++ b/buffer/4coder_buffer_abstract.cpp
@@ -17,7 +17,6 @@
 #define Buffer_Stringify_Type cat_4tech(Buffer_Type, _Stringify_Loop)
 #define Buffer_Backify_Type cat_4tech(Buffer_Type, _Backify_Loop)
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
 inline_4tech void
 buffer_stringify(Buffer_Type *buffer, int start, int end, char *out){
     for (Buffer_Stringify_Type loop = buffer_stringify_loop(buffer, start, end);
@@ -70,9 +69,7 @@ buffer_count_newlines(Buffer_Type *buffer, int start, int end){
     
     return(count);
 }
-#endif
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
 internal_4tech int
 buffer_seek_whitespace_down(Buffer_Type *buffer, int pos){
     Buffer_Stringify_Type loop;
@@ -477,14 +474,14 @@ buffer_rfind_string(Buffer_Type *buffer, int start_pos, char *str, int len, char
 buffer_rfind_string_end:
     return(pos);
 }
-#endif
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
+#ifndef NON_ABSTRACT_4TECH
 typedef struct Buffer_Measure_Starts{
     int i;
     int count;
     int start;
 } Buffer_Measure_Starts;
+#endif
 
 internal_4tech int
 buffer_measure_starts(Buffer_Measure_Starts *state, Buffer_Type *buffer){
@@ -525,6 +522,10 @@ buffer_measure_starts(Buffer_Measure_Starts *state, Buffer_Type *buffer){
     }
     
     if (i == size){
+        if (count == max){
+            result = 1;
+            goto buffer_measure_starts_end;
+        }
         starts[count++] = start;
     }
     
@@ -716,7 +717,6 @@ buffer_get_line_index(Buffer_Type *buffer, int pos){
     result = buffer_get_line_index_range(buffer, pos, 0, buffer->line_count);
     return(result);
 }
-#endif
 
 #ifndef NON_ABSTRACT_4TECH
 internal_4tech int
@@ -852,10 +852,8 @@ cursor_seek_step_end:
     state->prev_cursor = prev_cursor;
     return(result);
 }
-
 #endif
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
 internal_4tech Full_Cursor
 buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, float max_width, float font_height,
                    void *advance_data, int stride, Full_Cursor cursor){
@@ -941,9 +939,7 @@ buffer_cursor_from_wrapped_xy(Buffer_Type *buffer, float x, float y, int round_d
 
     return(result);
 }
-#endif
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
 internal_4tech void
 buffer_invert_edit_shift(Buffer_Type *buffer, Buffer_Edit edit, Buffer_Edit *inverse, char *strings,
                          int *str_pos, int max, int shift_amount){
@@ -968,11 +964,13 @@ buffer_invert_edit(Buffer_Type *buffer, Buffer_Edit edit, Buffer_Edit *inverse,
     buffer_invert_edit_shift(buffer, edit, inverse, strings, str_pos, max, 0);
 }
 
+#ifndef NON_ABSTRACT_4TECH
 typedef struct Buffer_Invert_Batch{
     int i;
     int shift_amount;
     int len;
 } Buffer_Invert_Batch;
+#endif
 
 internal_4tech int
 buffer_invert_batch(Buffer_Invert_Batch *state, Buffer_Type *buffer, Buffer_Edit *edits, int count,
@@ -1005,26 +1003,7 @@ buffer_invert_batch(Buffer_Invert_Batch *state, Buffer_Type *buffer, Buffer_Edit
     
     return(result);
 }
-#endif
 
-#if BUFFER_EXPERIMENT_SCALPEL <= 2
-internal_4tech void
-buffer_batch_edit(Buffer_Type *buffer, Buffer_Edit *sorted_edits, char *strings, int edit_count){
-    Buffer_Batch_State state;
-    int r;
-    
-    debug_4tech(int result);
-    
-    state.i = 0;
-    state.shift_total = 0;
-    
-    debug_4tech(result =)
-        buffer_batch_edit_step(&state, buffer, sorted_edits, strings, edit_count, &r);
-    assert_4tech(result == 0);
-}
-#endif
-
-#if BUFFER_EXPERIMENT_SCALPEL <= 3
 internal_4tech void
 buffer_get_render_data(Buffer_Type *buffer, float *wraps, Buffer_Render_Item *items, int max, int *count,
                        float port_x, float port_y, float scroll_x, float scroll_y, int wrapped,
@@ -1148,7 +1127,6 @@ buffer_get_render_data_end:
     assert_4tech(item_i <= max);
     *count = item_i;
 }
-#endif
 
 #ifndef NON_ABSTRACT_4TECH
 #define NON_ABSTRACT_4TECH 1
diff --git a/buffer/4coder_gap_buffer.cpp b/buffer/4coder_gap_buffer.cpp
index ec838ce9..1154a569 100644
--- a/buffer/4coder_gap_buffer.cpp
+++ b/buffer/4coder_gap_buffer.cpp
@@ -245,7 +245,8 @@ buffer_backify_next(Gap_Buffer_Backify_Loop *loop){
 }
 
 internal_4tech int
-buffer_replace_range(Gap_Buffer *buffer, int start, int end, char *str, int len, int *shift_amount, int *request_amount){
+buffer_replace_range(Gap_Buffer *buffer, int start, int end, char *str, int len, int *shift_amount,
+                     void *scratch, int scratch_memory, int *request_amount){
     char *data;
     int result;
     int size;
diff --git a/buffer/4coder_golden_array.cpp b/buffer/4coder_golden_array.cpp
index d351fec3..32019cb5 100644
--- a/buffer/4coder_golden_array.cpp
+++ b/buffer/4coder_golden_array.cpp
@@ -161,7 +161,8 @@ buffer_backify_next(Buffer_Backify_Loop *loop){
 }
 
 internal_4tech int
-buffer_replace_range(Buffer *buffer, int start, int end, char *str, int len, int *shift_amount, int *request_amount){
+buffer_replace_range(Buffer *buffer, int start, int end, char *str, int len, int *shift_amount,
+                     void *scratch, int scratch_size, int *request_amount){
     char *data;
     int result;
     int size;
diff --git a/buffer/4coder_multi_gap_buffer.cpp b/buffer/4coder_multi_gap_buffer.cpp
index 4c62eeaf..6c73401a 100644
--- a/buffer/4coder_multi_gap_buffer.cpp
+++ b/buffer/4coder_multi_gap_buffer.cpp
@@ -22,8 +22,8 @@ typedef struct Fixed_Width_Gap_Buffer{
     int start_pos;
 } Fixed_Width_Gap_Buffer;
 
-#define fixed_width_buffer_size Kbytes(8)
-#define fixed_width_buffer_half_size Kbytes(4)
+#define fixed_width_buffer_size (8 << 10)
+#define fixed_width_buffer_half_size (4 << 10)
 
 typedef struct Multi_Gap_Buffer{
     Fixed_Width_Gap_Buffer *gaps;
@@ -142,6 +142,7 @@ buffer_end_init(Multi_Gap_Buffer_Init *init, void *scratch, int scratch_size){
             start_pos = 0;
             
             for (i = 0; i < count; ++i, ++gap, pos += size){
+                assert_4tech(size == fixed_width_buffer_half_size);
                 if (pos + size > total_size) size = total_size - pos;
                 
                 if (gap->data){
@@ -225,7 +226,7 @@ buffer_stringify_loop(Multi_Gap_Buffer *buffer, int start, int end){
         result.absolute_pos = start;
         
         result.chunk_i = buffer_find_chunk(buffer, start);
-        result.chunk_end = buffer_find_chunk(buffer, end-1);
+        result.chunk_end = buffer_find_chunk(buffer, end);
         
         gap = result.gaps + result.chunk_end;
         end -= gap->start_pos;
@@ -312,7 +313,7 @@ buffer_backify_loop(Multi_Gap_Buffer *buffer, int start, int end){
         result.buffer = buffer;
         result.gaps = buffer->gaps;
         
-        result.chunk_i = buffer_find_chunk(buffer, start-1);
+        result.chunk_i = buffer_find_chunk(buffer, start);
         result.chunk_end = buffer_find_chunk(buffer, end);
         
         gap = result.gaps + result.chunk_end;
@@ -379,7 +380,8 @@ buffer_backify_next(Multi_Gap_Buffer_Backify_Loop *loop){
 }
 
 internal_4tech int
-buffer_replace_range(Multi_Gap_Buffer *buffer, int start, int end, char *str, int len, int *shift_amount_out, int *request_amount){
+buffer_replace_range(Multi_Gap_Buffer *buffer, int start, int end, char *str, int len, int *shift_amount_out,
+                     void *scratch, int scratch_size, int *request_amount){
     Fixed_Width_Gap_Buffer *gaps, *gap, *dgap;
     char *data;
     int move_size;
diff --git a/buffer/4coder_rope_buffer.cpp b/buffer/4coder_rope_buffer.cpp
index 7660177a..2b686157 100644
--- a/buffer/4coder_rope_buffer.cpp
+++ b/buffer/4coder_rope_buffer.cpp
@@ -80,7 +80,7 @@ buffer_begin_init(Rope_Buffer *buffer, char *data, int size){
     
     init.buffer = buffer;
     init.data = data;
-    init.size = size;
+    init.size = eol_in_place_convert_in(data, size);
     
     init.node_count = div_ceil_4tech(size, rope_string_width);
 
@@ -90,7 +90,7 @@ buffer_begin_init(Rope_Buffer *buffer, char *data, int size){
     }
     else{
         init.rope_string_count = round_pot_4tech(init.node_count);
-        init.node_count = init.rope_string_count*2 - 1;
+        init.node_count = init.rope_string_count*2;
     }
     
     return(init);
diff --git a/buffer/4coder_shared.cpp b/buffer/4coder_shared.cpp
index e4fca991..4f308e50 100644
--- a/buffer/4coder_shared.cpp
+++ b/buffer/4coder_shared.cpp
@@ -189,7 +189,7 @@ make_cursor_hint(int line_index, int *starts, float *wrap_ys, float font_height)
     hint.pos = starts[line_index];
     hint.line = line_index + 1;
     hint.character = 1;
-    hint.unwrapped_y = (f32)(line_index * font_height);
+    hint.unwrapped_y = (float)(line_index * font_height);
     hint.unwrapped_x = 0;
     hint.wrapped_y = wrap_ys[line_index];
     hint.wrapped_x = 0;
@@ -350,9 +350,10 @@ internal_4tech int
 eol_convert_in(char *dest, char *src, int size){
     int i, j;
     
-    for (i = 0, j = 0; i < size; ++i, ++j){
-        if (src[i] == '\r' && i+1 < size && src[i+1] == '\n') ++i;
-        dest[j] = src[i];
+    for (i = 0, j = 0; i < size; ++i){
+        if (src[i] != '\r'){
+            dest[j++] = src[i];
+        }
     }
     
     return(j);
@@ -360,16 +361,15 @@ eol_convert_in(char *dest, char *src, int size){
 
 internal_4tech int
 eol_in_place_convert_in(char *data, int size){
-    int i;
+    int i, j;
     
-    for (i = 0; i < size; ++i){
-        if (data[i] == '\r' && i+1 < size && data[i+1] == '\n'){
-            memmove_4tech(data + i, data + i + 1, size - i);
-            size -= 1;
+    for (i = 0, j = 0; i < size; ++i){
+        if (data[i] != '\r'){
+            data[j++] = data[i];
         }
     }
     
-    return(size);
+    return(j);
 }
 
 internal_4tech int
diff --git a/buffer/4coder_test_main.cpp b/buffer/4coder_test_main.cpp
new file mode 100644
index 00000000..3f7789ca
--- /dev/null
+++ b/buffer/4coder_test_main.cpp
@@ -0,0 +1,531 @@
+/* 
+ * Mr. 4th Dimention - Allen Webster
+ *  Four Tech
+ *
+ * public domain -- no warranty is offered or implied; use this code at your own risk
+ * 
+ * 06.11.2015
+ * 
+ * Buffer experiment testing layer
+ * 
+ */
+
+// TOP
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+#define inline_4tech inline
+
+inline_4tech int
+CEIL32(float x){
+    int extra;
+    extra = ((x!=(int)(x) && x>0)?1:0);
+    extra += (int)(x);
+    return(extra);
+}
+
+inline_4tech int
+DIVCEIL32(int n, int d) {
+    int q = (n/d);
+    q += (q*d < n);
+    return(q);
+}
+
+inline_4tech unsigned int
+ROUNDPOT32(unsigned int v){
+    v--;
+    v |= v >> 1;
+    v |= v >> 2;
+    v |= v >> 4;
+    v |= v >> 8;
+    v |= v >> 16;
+    v++;
+    return(v);
+}
+
+#ifdef fast_test
+#define debug_4tech(x)
+#define assert_4tech(x)
+#endif
+#define hard_assert_4tech(x) assert(x)
+
+#include "4coder_shared.cpp"
+#include "4coder_golden_array.cpp"
+#include "4coder_gap_buffer.cpp"
+#include "4coder_multi_gap_buffer.cpp"
+#include "4coder_rope_buffer.cpp"
+
+#define Buffer_Type Buffer
+#include "4coder_buffer_abstract.cpp"
+
+#undef Buffer_Type
+#define Buffer_Type Gap_Buffer
+#include "4coder_buffer_abstract.cpp"
+
+#undef Buffer_Type
+#define Buffer_Type Multi_Gap_Buffer
+#include "4coder_buffer_abstract.cpp"
+
+#undef Buffer_Type
+#define Buffer_Type Rope_Buffer
+#include "4coder_buffer_abstract.cpp"
+
+#undef Buffer_Type
+#undef Buffer_Init_Type
+#undef Buffer_Stringify_Type
+#undef Buffer_Backify_Type
+
+#ifdef _WIN32
+#include <Windows.h>
+
+typedef unsigned long long time_int;
+
+unsigned long long win32_counts_per_second_4tech;
+
+int time_init(unsigned long long *resolution){
+    int result;
+    LARGE_INTEGER time;
+    result = 0;
+    if (QueryPerformanceFrequency(&time)){
+        win32_counts_per_second_4tech = (unsigned long long)(time.QuadPart);
+        result = 1;
+        *resolution = win32_counts_per_second_4tech;
+    }
+    return(result);
+}
+
+time_int get_time(){
+    LARGE_INTEGER time;
+    time_int result;
+    
+    result = 0;
+    if (QueryPerformanceCounter(&time)){
+        result = (time_int)(time.QuadPart);
+        result = result * 1000000 / win32_counts_per_second_4tech;
+    }
+    
+    return(result);
+}
+
+#else
+#error Timer not supported by this platform
+#endif
+
+void setup(){
+    unsigned long long resolution;
+    if (!time_init(&resolution)){
+        printf("error: could not initialize timer");
+        exit(1);
+    }
+
+    if (resolution < 1000000)
+        printf("warning: timer is not actually at high enough resolution for good measurements!\n");
+
+}
+
+typedef struct File_Data{
+    char *data;
+    int size;
+} File_Data;
+
+File_Data get_file(char *filename){
+    FILE *file;
+    File_Data result;
+    
+    file = fopen(filename, "rb");
+    if (!file){
+        printf("error: could not find file %s\n", filename);
+        exit(1);
+    }
+
+    fseek(file, 0, SEEK_END);
+    result.size = ftell(file);
+    fseek(file, 0, SEEK_SET);
+
+    if (result.size == 0){        
+        printf("error: file %s was empty\n", filename);
+        exit(1);
+    }
+    
+    result.data = (char*)malloc(result.size);
+    fread(result.data, result.size, 1, file);
+
+    fclose(file);
+    
+    return(result);
+}
+
+void free_file(File_Data file){
+    free(file.data);
+}
+
+typedef struct Time_Record{
+    time_int buffer;
+    time_int gap_buffer;
+    time_int multi_gap_buffer;
+    time_int rope_buffer;
+} Time_Record;
+
+typedef struct Record_Statistics{
+    Time_Record max, min;
+    Time_Record expected;
+    int count;
+} Record_Statistics;
+
+Time_Record
+operator+(const Time_Record &a, const Time_Record &b){
+    Time_Record r;
+    r.buffer = a.buffer + b.buffer;
+    r.gap_buffer = a.gap_buffer + b.gap_buffer;
+    r.multi_gap_buffer = a.multi_gap_buffer + b.multi_gap_buffer;
+    r.rope_buffer = a.rope_buffer + b.rope_buffer;
+    return r;
+}
+
+#define minify(a,b) if ((a)>(b)) (a) = (b)
+#define maxify(a,b) if ((a)<(b)) (a) = (b)
+
+void
+get_record_statistics(Record_Statistics *stats_out, Time_Record *records, int count){
+    Record_Statistics stats;
+    stats.max = records[0];
+    stats.min = records[0];
+    stats.expected = records[0];
+    stats.count = count;
+
+    Time_Record *record = records + 1;
+    
+    for (int i = 1; i < count; ++i, ++record){
+        stats.expected = stats.expected + *record;
+        
+        minify(stats.min.buffer, record->buffer);
+        minify(stats.min.gap_buffer, record->gap_buffer);
+        minify(stats.min.multi_gap_buffer, record->multi_gap_buffer);
+        minify(stats.min.rope_buffer, record->rope_buffer);
+        
+        maxify(stats.max.buffer, record->buffer);
+        maxify(stats.max.gap_buffer, record->gap_buffer);
+        maxify(stats.max.multi_gap_buffer, record->multi_gap_buffer);
+        maxify(stats.max.rope_buffer, record->rope_buffer);
+    }
+
+    stats.expected.buffer /= count;
+    stats.expected.gap_buffer /= count;
+    stats.expected.multi_gap_buffer /= count;
+    stats.expected.rope_buffer /= count;
+    
+    *stats_out = stats;
+}
+
+int test_is_silenced;
+
+void
+silence_test(){
+    test_is_silenced = 1;
+}
+
+void
+print_record(Time_Record record){
+    printf("%-16s - %25lluus\n%-16s - %25lluus\n%-16s - %25lluus\n%-16s - %25lluus\n",
+           "Golden Array", record.buffer,
+           "Gap Buffer", record.gap_buffer,
+           "Multi-Gap Buffer", record.multi_gap_buffer,
+           "Rope", record.rope_buffer);
+}
+
+void
+print_statistics(Time_Record *records, int count, Record_Statistics *stats_out){
+    Record_Statistics stats;
+    get_record_statistics(&stats, records, count);
+    if (!test_is_silenced){
+        printf("samples: %d\n", count);
+        printf("---averages---\n");
+        print_record(stats.expected);
+        printf("---max---\n");
+        print_record(stats.max);
+        printf("---min---\n");
+        print_record(stats.min);
+    }
+
+    if (stats_out) *stats_out = stats;
+}
+
+typedef struct Buffer_Set{
+    Buffer buffer;
+    Gap_Buffer gap_buffer;
+    Multi_Gap_Buffer multi_gap_buffer;
+    Rope_Buffer rope_buffer;
+} Buffer_Set;
+
+template<typename Buffer_Init_Type, typename Buffer_Type> void
+init_buffer(Buffer_Type *buffer, File_Data file, void *scratch, int scratch_size){
+    *buffer = {};
+    Buffer_Init_Type init;
+    for (init = buffer_begin_init(buffer, file.data, file.size);
+         buffer_init_need_more(&init);){
+        int page_size = buffer_init_page_size(&init);
+        void *page = malloc(page_size);
+        buffer_init_provide_page(&init, page, page_size);
+    }
+    debug_4tech(int result =)
+        buffer_end_init(&init, scratch, scratch_size);
+    assert_4tech(result);
+}
+
+#define print_name() printf("%s:\n", __FUNCTION__)
+
+void
+initialization_test(Buffer_Set *set, File_Data file, int test_repitions,
+                    void *scratch, int scratch_size, Record_Statistics *stats_out){
+    time_int tstart, tend;
+    Time_Record *init_time = (Time_Record*)scratch;
+    scratch = init_time + test_repitions;
+    assert_4tech(test_repitions*sizeof(*init_time) < scratch_size);
+    scratch_size -= test_repitions*sizeof(*init_time);
+    
+    for (int i = 0; i < test_repitions; ++i){
+        tstart = get_time();
+        init_buffer<Buffer_Init>(&set->buffer, file, scratch, scratch_size);
+        tend = get_time();
+        init_time[i].buffer = tend - tstart;
+    
+        tstart = get_time();
+        init_buffer<Gap_Buffer_Init>(&set->gap_buffer, file, scratch, scratch_size);
+        tend = get_time();
+        init_time[i].gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        init_buffer<Multi_Gap_Buffer_Init>(&set->multi_gap_buffer, file, scratch, scratch_size);
+        tend = get_time();
+        init_time[i].multi_gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        init_buffer<Rope_Buffer_Init>(&set->rope_buffer, file, scratch, scratch_size);
+        tend = get_time();
+        init_time[i].rope_buffer = tend - tstart;
+
+        if (i+1 != test_repitions){
+            free(set->buffer.data);
+            free(set->gap_buffer.data);
+            for (int j = 0; j < set->multi_gap_buffer.chunk_alloced; ++j){
+                free(set->multi_gap_buffer.gaps[j].data);
+            }
+            free(set->multi_gap_buffer.gaps);
+            free(set->rope_buffer.data);
+            free(set->rope_buffer.nodes);
+        }
+    }
+
+    if (!test_is_silenced) print_name();
+    print_statistics(init_time, test_repitions, stats_out);
+    if (!test_is_silenced) printf("\n");
+    test_is_silenced = 0;
+}
+
+template<typename Buffer_Type> void
+measure_starts(Buffer_Type *buffer){
+    int max = 1 << 10;
+    buffer->line_starts = (int*)malloc(max*sizeof(int));
+    buffer->line_max = max;
+
+    Buffer_Measure_Starts state = {};
+    for (;buffer_measure_starts(&state, buffer);){
+        int max = buffer->line_max;
+        int count = state.count;
+        int target = count + 1;
+
+        max = target*2;
+        int *new_lines = (int*)malloc(max*sizeof(int));
+        memcpy_4tech(new_lines, buffer->line_starts, count*sizeof(int));
+        free(buffer->line_starts);
+        buffer->line_starts = new_lines;
+        buffer->line_max = max;
+    }
+    buffer->line_count = state.count;
+}
+
+void
+measure_starts_test(Buffer_Set *set, int test_repitions,
+                    void *scratch, int scratch_size, Record_Statistics *stats_out){
+    time_int tstart, tend;
+    Time_Record *measure_time = (Time_Record*)scratch;
+    scratch = measure_time + test_repitions;
+    assert_4tech(test_repitions*sizeof(*measure_time) < scratch_size);
+    scratch_size -= test_repitions*sizeof(*measure_time);
+    
+    for (int i = 0; i < test_repitions; ++i){
+        tstart = get_time();
+        measure_starts(&set->buffer);
+        tend = get_time();
+        measure_time[i].buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_starts(&set->gap_buffer);
+        tend = get_time();
+        measure_time[i].gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_starts(&set->multi_gap_buffer);
+        tend = get_time();
+        measure_time[i].multi_gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_starts(&set->rope_buffer);
+        tend = get_time();
+        measure_time[i].rope_buffer = tend - tstart;
+
+        if (i+1 != test_repitions){
+            free(set->buffer.line_starts);
+            free(set->gap_buffer.line_starts);
+            free(set->multi_gap_buffer.line_starts);
+            free(set->rope_buffer.line_starts);
+        }
+    }
+
+    if (!test_is_silenced) print_name();
+    print_statistics(measure_time, test_repitions, stats_out);
+    if (!test_is_silenced) printf("\n");
+    test_is_silenced = 0;
+}
+
+template<typename Buffer_Type> void
+measure_widths(Buffer_Type *buffer){
+    int new_max = round_up_4tech(buffer->line_count, 1 << 10);
+    if (new_max < (1 << 10)) new_max = 1 << 10;
+        
+    buffer->line_widths = (float*)malloc(new_max*sizeof(float));
+    buffer->widths_max = new_max;
+    buffer->widths_count = 0;
+    
+    float glyph_width = 8.f;
+    buffer_measure_widths(buffer, &glyph_width, 0);
+}
+
+void
+measure_widths_test(Buffer_Set *set, int test_repitions,
+                    void *scratch, int scratch_size, Record_Statistics *stats_out){
+    time_int tstart, tend;
+    Time_Record *measure_time = (Time_Record*)scratch;
+    scratch = measure_time + test_repitions;
+    assert_4tech(test_repitions*sizeof(*measure_time) < scratch_size);
+    scratch_size -= test_repitions*sizeof(*measure_time);
+    
+    for (int i = 0; i < test_repitions; ++i){
+        tstart = get_time();
+        measure_widths(&set->buffer);
+        tend = get_time();
+        measure_time[i].buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_widths(&set->gap_buffer);
+        tend = get_time();
+        measure_time[i].gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_widths(&set->multi_gap_buffer);
+        tend = get_time();
+        measure_time[i].multi_gap_buffer = tend - tstart;
+    
+        tstart = get_time();
+        measure_widths(&set->rope_buffer);
+        tend = get_time();
+        measure_time[i].rope_buffer = tend - tstart;
+
+        if (i+1 != test_repitions){
+            free(set->buffer.line_widths);
+            free(set->gap_buffer.line_widths);
+            free(set->multi_gap_buffer.line_widths);
+            free(set->rope_buffer.line_widths);
+        }
+    }
+
+    if (!test_is_silenced) print_name();
+    print_statistics(measure_time, test_repitions, stats_out);
+    if (!test_is_silenced) printf("\n");
+    test_is_silenced = 0;
+}
+
+int
+page_compare(char *page_1, char *page_2, int page_size){
+    int result = 1;
+    for (int i = 0; i < page_size; ++i){
+        hard_assert_4tech(page_1[i] == page_2[i]);
+    }
+    return result;
+}
+
+void
+stream_check_test(Buffer_Set *buffers, void *scratch, int scratch_size){
+    int i, page_size, size;
+    
+    size = buffer_size(&buffers->buffer);
+    {
+        int size2;
+        size2 = buffer_size(&buffers->gap_buffer);
+        hard_assert_4tech(size == size2);
+        size2 = buffer_size(&buffers->multi_gap_buffer);
+        hard_assert_4tech(size == size2);
+        size2 = buffer_size(&buffers->rope_buffer);
+        hard_assert_4tech(size == size2);
+    }
+
+    page_size = 1 << 10;
+
+    char *page_1 = (char*)scratch;
+    char *page_2 = page_1 + page_size;
+    scratch_size -= page_size*2;
+    hard_assert_4tech(scratch_size > 0);
+    
+    for (i = 0; i < size; i += page_size){
+        int end = i + page_size;
+        if (end > size) end = size;
+        
+        buffer_stringify(&buffers->buffer, i, end, page_1);
+        
+        buffer_stringify(&buffers->gap_buffer, i, end, page_2);
+        page_compare(page_1, page_2, page_size);
+        
+        buffer_stringify(&buffers->multi_gap_buffer, i, end, page_2);
+        page_compare(page_1, page_2, page_size);
+        
+        buffer_stringify(&buffers->rope_buffer, i, end, page_2);
+        page_compare(page_1, page_2, page_size);
+    }
+}
+
+int main(){
+    Buffer_Set buffers;
+    File_Data file;
+
+    void *scratch;
+    int scratch_size;
+    
+    setup();
+
+    scratch_size = 1 << 20;
+    scratch = malloc(scratch_size);
+    
+    file = get_file("test_file_1.cpp");
+    
+    Record_Statistics init_rec, starts_rec, widths_rec;
+    
+    initialization_test(&buffers, file, 100, scratch, scratch_size, &init_rec);
+    stream_check_test(&buffers, scratch, scratch_size);
+    
+    measure_starts_test(&buffers, 100, scratch, scratch_size, &starts_rec);
+    measure_widths_test(&buffers, 100, scratch, scratch_size, &widths_rec);
+    
+    Time_Record expected_file_open;
+    expected_file_open = init_rec.expected + starts_rec.expected + widths_rec.expected;
+    
+    printf("average file open:\n");
+    print_record(expected_file_open);
+    
+    return(0);
+}
+
+// BOTTOM
+