From ab6cb49b0b875b5c27510dc57fe3767bfd074dae Mon Sep 17 00:00:00 2001
From: johannes <johannes.herman@gmail.com>
Date: Wed, 7 Feb 2024 15:43:27 +0100
Subject: added packed int writer

---
 inc/pack.h |  4 ++++
 src/demo.c |  4 ++--
 src/main.c | 29 +++++++++++++++++++++++++++++
 src/pack.c | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/inc/pack.h b/inc/pack.h
index 55ebf4e..49e581c 100644
--- a/inc/pack.h
+++ b/inc/pack.h
@@ -13,4 +13,8 @@ void tobigendian(const int in, unsigned char out[4]);
 /* the given pointer is incremented */
 int readint(unsigned char **cp);
 
+/* writes given int to teeworlds packed */
+/* the given pointer is incremented */
+void writeint(int in, char **cp);
+
 #endif // PACK_H
diff --git a/src/demo.c b/src/demo.c
index bfb233e..8452b06 100644
--- a/src/demo.c
+++ b/src/demo.c
@@ -380,7 +380,7 @@ int writedemotick(FILE *fp, demotick *tick, unsigned char ver)
     header |= tick->keyframe << 6;
     if (ver >= 5)
         header |= tick->innline << 5;
-    
+
     if (tick->innline)
     {
         header |= tick->delta;
@@ -400,6 +400,6 @@ int writedemotick(FILE *fp, demotick *tick, unsigned char ver)
 
 int writedemosnap(FILE *fp, demosnap *snap, unsigned char ver)
 {
-     
+
     return 1;
 }
diff --git a/src/main.c b/src/main.c
index e33594a..a21c4cf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include "../inc/demo.h"
 #include "../inc/huffman.h"
+#include "../inc/pack.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -109,6 +110,34 @@ int testdecompress(char *line)
     return 1;
 }
 
+void dumbtestpacker()
+{
+    char buf[16] = {0};
+    int in = 550;
+    int in2 = 8763289;
+
+    printf("input: %d\n", in);
+
+    for (int i = 0; i < 16; i++)
+        printf("%2X ", buf[i]);
+    printf("\n");
+    char *cp = buf;
+
+    writeint(in, &cp);
+    writeint(in2, &cp);
+
+    for (int i = 0; i < 16; i++)
+        printf("%2X ", buf[i]);
+    printf("\n");
+
+    cp = buf;
+    int res = readint((unsigned char **)&cp);
+    int res2 = readint((unsigned char **)&cp);
+
+    printf("res: %d\n", res);
+    printf("res2: %d\n", res2);
+}
+
 int main()
 {
     inithuff(NULL);
diff --git a/src/pack.c b/src/pack.c
index b9a23be..918bda9 100644
--- a/src/pack.c
+++ b/src/pack.c
@@ -46,3 +46,36 @@ int readint(unsigned char **cp)
 
     return result;
 }
+
+void writeint(int in, char **cp)
+{
+    int sign = in < 0;
+    in = (in ^ -sign);
+    char next = (in & 0b00111111);
+    in >>= 6;
+
+    char head = 0;
+    if (in != 0)
+        head |= 0b10000000;
+    if (sign != 0)
+        head |= 0b01000000;
+
+    printf("writing: %2X\n", head | next);
+    **cp = head | next;
+    (*cp)++;
+
+    while (in != 0)
+    {
+        next = (in & 0b01111111);
+        in >>= 7;
+
+        if (in != 0)
+            head = 0b10000000;
+        else
+            head = 0;
+
+        printf("writing: %2X\n", head | next);
+        **cp = head | next;
+        (*cp)++;
+    }
+}
-- 
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