initial import

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@2 be3aeb3a-fb24-0410-a615-afba39da0efa

platform/win32/GenaDrive/Unzip.cpp

@@ -0,0 +1,109 @@
+
+
+#include "app.h"
+#include "Unzip.h"
+#include "zlib.h"
+
+// Decompress a 'deflate' compressed buffer
+static int Inflate(unsigned char *dest,int destLen, unsigned char *src,int srcLen)
+{
+  z_stream stream;
+
+  memset(&stream,0,sizeof(stream));
+
+  stream.next_in  =src;
+  stream.avail_in =srcLen;
+  stream.next_out =dest;
+  stream.avail_out=destLen;
+  inflateInit2(&stream,-15);
+  inflate(&stream,Z_FINISH);
+  inflateEnd(&stream);
+
+  return 0;
+}
+
+static int Get32(unsigned char *src)
+{
+  return src[0] | (src[1]<<8) | (src[2]<<16) | (src[3]<<24);
+}
+
+// --------------------------------------------------------------
+Unzip::Unzip()
+{
+  memset(this,0,sizeof(*this));
+}
+
+int Unzip::gotoFirstFile()
+{
+  headerPos=0;
+  return 0;
+}
+
+int Unzip::fileOpen()
+{
+  int ret=0,okay=0;
+
+  fseek(file,headerPos,SEEK_SET);
+
+  // Read in file entry header:
+  ret=fread(head,1,sizeof(head),file);
+  if (ret!=sizeof(head)) return 1;
+
+  // Check header:
+  if (head[0]=='P' && head[1]=='K' && head[2]==3 && head[3]==4) okay=1;
+  if (okay==0) return 1;
+
+  // Get compressed and uncompressed sizes:
+  srcLen =Get32(head+0x12);
+  dataLen=Get32(head+0x16);
+
+  // Get size of name and extra fields:
+  nameLen=Get32(head+0x1a);
+  extraLen=nameLen>>16; nameLen&=0xffff;
+
+  // Read in name:
+  name=(char *)malloc(nameLen+1); if (name==NULL) return 1;
+  memset(name,0,nameLen+1);
+  fread(name,1,nameLen,file);
+
+  // Find position of compressed data in the file
+  compPos=headerPos+sizeof(head);
+  compPos+=nameLen+extraLen;
+
+  return 0;
+}
+
+int Unzip::fileClose()
+{
+  free(name); name=NULL;
+
+  // Go to next header:
+  headerPos=compPos+srcLen;
+
+  srcLen=dataLen=0;
+  nameLen=extraLen=0;
+
+  return 0;
+}
+
+int Unzip::fileDecode(unsigned char *data)
+{
+  unsigned char *src=NULL;
+
+  // Go to compressed data:
+  fseek(file,compPos,SEEK_SET);
+
+  // Allocate memory:
+  src=(unsigned char *)malloc(srcLen);
+  if (src==NULL) { fclose(file); return 1; }
+  memset(src,0,srcLen);
+
+  // Read in compressed version and decompress
+  fread(src,1,srcLen,file);
+
+  Inflate(data,dataLen, src,srcLen);
+
+  free(src); src=NULL; srcLen=0;
+
+  return 0;
+}