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buffer_entry.c and buffer_entry.h added

This commit is contained in:
fc_botelho 2006-04-19 18:44:29 +00:00
parent 99d2a2527d
commit 7767312143
2 changed files with 100 additions and 0 deletions

86
src/buffer_entry.c Normal file
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#include "buffer_entry.h"
#include <stdio.h>
#include <assert.h>
#include <stdlib.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(buffer_entry->capacity, sizeof(cmph_uint8));
buffer_entry->nbytes = fread(buffer_entry->buff, 1, 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_uint8 * buf = (cmph_uint8 *)malloc(BUFSIZ);
cmph_uint32 buf_pos = 0;
cmph_uint8 c;
while(1)
{
if(buffer_entry->eof && (buffer_entry->pos == buffer_entry->nbytes)) // end
{
free(buf);
return NULL;
}
if(buffer_entry->pos == buffer_entry->nbytes) buffer_entry_load(buffer_entry);
c = buffer_entry->buff[(buffer_entry->pos)++];
buf[buf_pos++] = c;
if(c == '\0') break;
if(buf_pos % BUFSIZ == 0) buf = (cmph_uint8 *)realloc(buf, buf_pos + BUFSIZ);
}
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);
}

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src/buffer_entry.h Normal file
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#ifndef __CMPH_BUFFER_ENTRY_H__
#define __CMPH_BUFFER_ENTRY_H__
#include "cmph_types.h"
#include <stdio.h>
typedef struct __buffer_entry_t buffer_entry_t;
buffer_entry_t * buffer_entry_new(cmph_uint32 capacity);
void buffer_entry_set_capacity(buffer_entry_t * buffer_entry, cmph_uint32 capacity);
cmph_uint32 buffer_entry_get_capacity(buffer_entry_t * buffer_entry);
void buffer_entry_open(buffer_entry_t * buffer_entry, char * filename);
cmph_uint8 * buffer_entry_read_key(buffer_entry_t * buffer_entry);
void buffer_entry_destroy(buffer_entry_t * buffer_entry);
#endif