First attempt of gzip decompression with miniz

src/lib/epd.cpp

@@ -165,8 +165,41 @@ void refreshFromMemory()
   }
 }
 
+const unsigned char* decIcons[5];
+
 void setupDisplays()
 {
+  for (int i = 0; i < 1; i++) {
+
+    const size_t compressedSize = 408;
+    
+    // Get required output buffer size
+    size_t decompressedSize = GzipDecompressor::getDecompressedSize(epd_icons_pickaxe, compressedSize);
+    if (decompressedSize == 0) {
+        Serial.println("Failed to get decompressed size");
+        continue;
+    }
+    
+    // Allocate output buffer
+    uint8_t* decompressedData = (uint8_t*)malloc(decompressedSize);
+    if (!decompressedData) {
+        Serial.println("Failed to allocate memory");
+        continue;
+    }
+    
+    // Decompress
+    if (GzipDecompressor::decompressData(epd_icons_pickaxe, compressedSize, 
+                                       decompressedData, &decompressedSize)) {
+        Serial.println("Decompression successful");
+        // Use decompressedData here
+    } else {
+        Serial.printf("Decompression failed, Compressed: %d, Decompressed: %d\n", compressedSize, decompressedSize);
+    }
+    
+    free(decompressedData);
+  }
+  
+
   std::lock_guard<std::mutex> lockMcp(mcpMutex);
 
   for (uint i = 0; i < NUM_SCREENS; i++)
@@ -614,10 +647,7 @@ void renderIcon(const uint dispNum, const String &text, bool partial)
     iconIndex = 4;
   }
 
-  
- 
-
-  displays[dispNum].drawInvertedBitmap(0,0, epd_icons_allArray[iconIndex], 122, 250, getFgColor());
+  // displays[dispNum].drawInvertedBitmap(0,0, decIcons[iconIndex], 122, 250, getFgColor());
 
 
 //  displays[dispNum].drawInvertedBitmap(0,0, getOceanIcon(), 122, 250, getFgColor());

src/lib/epd.hpp

@@ -3,7 +3,7 @@
 #include <Fonts/FreeSans9pt7b.h>
 #include <Fonts/FreeSansBold9pt7b.h>
 #include <GxEPD2_BW.h>
-
+#include "gzip_decompressor.hpp"
 
 #include <mcp23x17_pin.hpp>
 #include <mutex>

src/lib/gzip_decompressor.hpp

@@ -0,0 +1,55 @@
+#include "rom/miniz.h"
+
+class GzipDecompressor {
+private:
+    static const size_t CHUNK_SIZE = 1024;  // Adjust based on your needs
+
+public:
+    // Returns decompressed size or 0 if failed
+    static size_t getDecompressedSize(const uint8_t* input, size_t inputSize) {
+        size_t decompSize = 0;
+        // Last 4 bytes of gzip contain decompressed size
+        if (inputSize >= 4) {
+            decompSize = (input[inputSize - 1] << 24) |
+                        (input[inputSize - 2] << 16) |
+                        (input[inputSize - 3] << 8) |
+                        (input[inputSize - 4]);
+        }
+        return decompSize;
+    }
+
+    static bool decompressData(const uint8_t* input, size_t inputSize, 
+                             uint8_t* output, size_t* outputSize) {
+        tinfl_decompressor decomp;
+        tinfl_init(&decomp);
+
+        size_t inPos = 0;
+        size_t outPos = 0;
+        
+        // Skip gzip header (usually 10 bytes)
+        if (inputSize > 10) {
+            inPos = 10;
+        }
+
+        while (inPos < inputSize - 8) {  // -8 for footer
+            size_t inBytes = inputSize - inPos - 8;  // Don't read footer
+            size_t outBytes = *outputSize - outPos;
+            
+            tinfl_status status = tinfl_decompress(&decomp,
+                &input[inPos], &inBytes,
+                output, &output[outPos], &outBytes,
+                TINFL_FLAG_HAS_MORE_INPUT | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);
+
+            inPos += inBytes;
+            outPos += outBytes;
+
+            if (status == TINFL_STATUS_DONE) {
+                *outputSize = outPos;
+                return true;
+            } else if (status < 0) {
+                return false;
+            }
+        }
+        return false;
+    }
+};

src/lib/shared.cpp

@@ -151,4 +151,25 @@ String calculateSHA256(WiFiClient *stream, size_t contentLength) {
 //   uint8_t *pUncompressed;
 //   pUncompressed = (uint8_t *)malloc(iUncompSize+4);
 //   zt.gunzip((uint8_t *)ocean_logo_comp, ocean_logo_size, pUncompressed);
-// }
+// }
+
+void decompressData(const uint8_t* input, size_t inputSize, uint8_t* output, size_t outputSize) {
+    tinfl_decompressor decomp;
+    tinfl_init(&decomp);
+    
+    size_t inPos = 0;
+    size_t outPos = 0;
+    
+    while (inPos < inputSize) {
+        size_t inBytes = inputSize - inPos;
+        size_t outBytes = outputSize - outPos;
+        
+        tinfl_decompress(&decomp, 
+            &input[inPos], &inBytes,
+            output, &output[outPos], &outBytes,
+            TINFL_FLAG_PARSE_ZLIB_HEADER);
+            
+        inPos += inBytes;
+        outPos += outBytes;
+    }
+}

src/lib/shared.hpp

@@ -12,6 +12,7 @@
 #include <mbedtls/md.h>
 #include "esp_crt_bundle.h"
 #include <Update.h>
+#include <rom/miniz.h>
 
 #include <mutex>
 #include <utils.hpp>
@@ -91,4 +92,6 @@ struct ScreenMapping {
 };
 
 String calculateSHA256(uint8_t* data, size_t len);
-String calculateSHA256(WiFiClient *stream, size_t contentLength);
+String calculateSHA256(WiFiClient *stream, size_t contentLength);
+
+void decompressData(const uint8_t* input, size_t inputSize, uint8_t* output, size_t outputSize);