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/******************************************************************************
* Project: PROJ.4
* Purpose: Implementation of the pj_ctx_* file api, and the default stdio
* based implementation.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2013, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <projects.h>
#include <string.h>
static PAFile pj_stdio_fopen(projCtx ctx, const char *filename,
const char *access);
static size_t pj_stdio_fread(void *buffer, size_t size, size_t nmemb,
PAFile file);
static int pj_stdio_fseek(PAFile file, long offset, int whence);
static long pj_stdio_ftell(PAFile file);
static void pj_stdio_fclose(PAFile file);
static projFileAPI default_fileapi = {
pj_stdio_fopen,
pj_stdio_fread,
pj_stdio_fseek,
pj_stdio_ftell,
pj_stdio_fclose
};
typedef struct {
projCtx ctx;
FILE *fp;
} stdio_pafile;
/************************************************************************/
/* pj_get_default_fileapi() */
/************************************************************************/
projFileAPI *pj_get_default_fileapi()
{
return &default_fileapi;
}
/************************************************************************/
/* pj_stdio_fopen() */
/************************************************************************/
static PAFile pj_stdio_fopen(projCtx ctx, const char *filename,
const char *access)
{
stdio_pafile *pafile;
FILE *fp;
fp = fopen(filename, access);
if (fp == NULL)
{
return NULL;
}
pafile = (stdio_pafile *) malloc(sizeof(stdio_pafile));
pafile->fp = fp;
pafile->ctx = ctx;
return (PAFile) pafile;
}
/************************************************************************/
/* pj_stdio_fread() */
/************************************************************************/
static size_t pj_stdio_fread(void *buffer, size_t size, size_t nmemb,
PAFile file)
{
stdio_pafile *pafile = (stdio_pafile *) file;
return fread(buffer, size, nmemb, pafile->fp);
}
/************************************************************************/
/* pj_stdio_fseek() */
/************************************************************************/
static int pj_stdio_fseek(PAFile file, long offset, int whence)
{
stdio_pafile *pafile = (stdio_pafile *) file;
return fseek(pafile->fp, offset, whence);
}
/************************************************************************/
/* pj_stdio_ftell() */
/************************************************************************/
static long pj_stdio_ftell(PAFile file)
{
stdio_pafile *pafile = (stdio_pafile *) file;
return ftell(pafile->fp);
}
/************************************************************************/
/* pj_stdio_fclose() */
/************************************************************************/
static void pj_stdio_fclose(PAFile file)
{
stdio_pafile *pafile = (stdio_pafile *) file;
fclose(pafile->fp);
free(pafile);
}
/************************************************************************/
/* pj_ctx_fopen() */
/* */
/* Open a file using the provided file io hooks. */
/************************************************************************/
PAFile pj_ctx_fopen(projCtx ctx, const char *filename, const char *access)
{
return ctx->fileapi->FOpen(ctx, filename, access);
}
/************************************************************************/
/* pj_ctx_fread() */
/************************************************************************/
size_t pj_ctx_fread(projCtx ctx, void *buffer, size_t size, size_t nmemb, PAFile file)
{
return ctx->fileapi->FRead(buffer, size, nmemb, file);
}
/************************************************************************/
/* pj_ctx_fseek() */
/************************************************************************/
int pj_ctx_fseek(projCtx ctx, PAFile file, long offset, int whence)
{
return ctx->fileapi->FSeek(file, offset, whence);
}
/************************************************************************/
/* pj_ctx_ftell() */
/************************************************************************/
long pj_ctx_ftell(projCtx ctx, PAFile file)
{
return ctx->fileapi->FTell(file);
}
/************************************************************************/
/* pj_ctx_fclose() */
/************************************************************************/
void pj_ctx_fclose(projCtx ctx, PAFile file)
{
ctx->fileapi->FClose(file);
}
/************************************************************************/
/* pj_ctx_fgets() */
/* */
/* A not very optimal implementation of fgets on top of */
/* fread(). If we end up using this a lot more care should be */
/* taken. */
/************************************************************************/
char *pj_ctx_fgets(projCtx ctx, char *line, int size, PAFile file)
{
long start = pj_ctx_ftell(ctx, file);
size_t bytes_read;
int i;
line[size-1] = '\0';
bytes_read = pj_ctx_fread(ctx, line, 1, size-1, file);
if(bytes_read == 0)
return NULL;
if(bytes_read < (size_t)size)
{
line[bytes_read] = '\0';
}
for( i = 0; i < size-2; i++)
{
if (line[i] == '\n')
{
line[i+1] = '\0';
pj_ctx_fseek(ctx, file, start + i + 1, SEEK_SET);
break;
}
}
return line;
}
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