1 files changed, 103 insertions, 0 deletions
diff --git a/girepository/cmph/buffer_entry.c b/girepository/cmph/buffer_entry.c
new file mode 100644
index 00000000..7f82aae1
--- /dev/null
+++ b/girepository/cmph/buffer_entry.c
@@ -0,0 +1,103 @@
+#include "buffer_entry.h"
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct __buffer_entry_t
+{
+	FILE *fd;
+	cmph_uint8 * buff;
+	cmph_uint32 capacity, // buffer entry capacity
+		    nbytes,   // buffer entry used bytes
+		    pos;      // current read position in buffer entry
+	cmph_uint8  eof;      // flag to indicate end of file
+};
+
+buffer_entry_t * buffer_entry_new(cmph_uint32 capacity)
+{
+	buffer_entry_t *buff_entry = (buffer_entry_t *)malloc(sizeof(buffer_entry_t));
+	assert(buff_entry);
+	buff_entry->fd = NULL;
+	buff_entry->buff = NULL;
+	buff_entry->capacity = capacity;
+	buff_entry->nbytes = capacity;
+	buff_entry->pos = capacity;
+        buff_entry->eof = 0;
+	return buff_entry;
+}
+
+void buffer_entry_open(buffer_entry_t * buffer_entry, char * filename)
+{
+	buffer_entry->fd = fopen(filename, "rb");
+}
+
+void buffer_entry_set_capacity(buffer_entry_t * buffer_entry, cmph_uint32 capacity)
+{
+	buffer_entry->capacity = capacity;
+}
+
+
+cmph_uint32 buffer_entry_get_capacity(buffer_entry_t * buffer_entry)
+{
+	return buffer_entry->capacity;
+}
+
+void buffer_entry_load(buffer_entry_t * buffer_entry)
+{
+	free(buffer_entry->buff);
+	buffer_entry->buff = (cmph_uint8 *)calloc((size_t)buffer_entry->capacity, sizeof(cmph_uint8));
+	buffer_entry->nbytes = (cmph_uint32)fread(buffer_entry->buff, (size_t)1, (size_t)buffer_entry->capacity, buffer_entry->fd);
+	if (buffer_entry->nbytes != buffer_entry->capacity) buffer_entry->eof = 1;
+	buffer_entry->pos = 0;
+}
+
+cmph_uint8 * buffer_entry_read_key(buffer_entry_t * buffer_entry, cmph_uint32 * keylen)
+{
+	cmph_uint8 * buf = NULL;
+	cmph_uint32 lacked_bytes = sizeof(*keylen);
+	cmph_uint32 copied_bytes = 0;
+	if(buffer_entry->eof && (buffer_entry->pos == buffer_entry->nbytes)) // end
+	{
+		free(buf);
+		return NULL;
+	}
+	if((buffer_entry->pos + lacked_bytes) > buffer_entry->nbytes) 
+	{
+		copied_bytes = buffer_entry->nbytes - buffer_entry->pos;
+		lacked_bytes = (buffer_entry->pos + lacked_bytes) - buffer_entry->nbytes;
+		if (copied_bytes != 0) memcpy(keylen, buffer_entry->buff + buffer_entry->pos, (size_t)copied_bytes);
+		buffer_entry_load(buffer_entry);
+	}
+	memcpy(keylen + copied_bytes, buffer_entry->buff + buffer_entry->pos, (size_t)lacked_bytes);
+	buffer_entry->pos += lacked_bytes;
+	
+	lacked_bytes = *keylen;
+	copied_bytes = 0;
+	buf = (cmph_uint8 *)malloc(*keylen + sizeof(*keylen));
+        memcpy(buf, keylen, sizeof(*keylen));
+	if((buffer_entry->pos + lacked_bytes) > buffer_entry->nbytes) {
+		copied_bytes = buffer_entry->nbytes - buffer_entry->pos;
+		lacked_bytes = (buffer_entry->pos + lacked_bytes) - buffer_entry->nbytes;
+		if (copied_bytes != 0) {
+			memcpy(buf + sizeof(*keylen), buffer_entry->buff + buffer_entry->pos, (size_t)copied_bytes);
+                }
+		buffer_entry_load(buffer_entry);
+	}        
+	memcpy(buf+sizeof(*keylen)+copied_bytes, buffer_entry->buff + buffer_entry->pos, (size_t)lacked_bytes);
+	buffer_entry->pos += lacked_bytes;
+	return buf;
+}
+
+void buffer_entry_destroy(buffer_entry_t * buffer_entry)
+{
+  fclose(buffer_entry->fd);
+  buffer_entry->fd = NULL;
+  free(buffer_entry->buff);
+  buffer_entry->buff = NULL;
+  buffer_entry->capacity = 0;
+  buffer_entry->nbytes = 0;
+  buffer_entry->pos = 0;  
+  buffer_entry->eof = 0;
+  free(buffer_entry);
+}