pdfio/pdfio-file.c
Michael R Sweet e2e2192ea9
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2021-04-27 21:22:34 -04:00

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//
// PDF file functions for pdfio.
//
// Copyright © 2021 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
//
// Include necessary headers...
//
#include "pdfio-private.h"
#ifndef O_BINARY
# define O_BINARY 0
#endif // !O_BINARY
//
// Local functions...
//
static bool write_trailer(pdfio_file_t *pdf);
//
// 'pdfioFileClose()' - Close a PDF file and free all memory used for it.
//
bool // O - `true` on success and `false` on failure
pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
{
bool ret = true; // Return value
size_t i; // Looping var
// Range check input
if (!pdf)
return (false);
// Close the file itself...
if (pdf->mode == _PDFIO_MODE_WRITE)
ret = write_trailer(pdf);
if (close(pdf->fd) < 0)
ret = false;
// Free all data...
free(pdf->filename);
free(pdf->version);
for (i = 0; i < pdf->num_arrays; i ++)
_pdfioArrayDelete(pdf->arrays[i]);
free(pdf->arrays);
for (i = 0; i < pdf->num_dicts; i ++)
_pdfioDictDelete(pdf->dicts[i]);
free(pdf->dicts);
for (i = 0; i < pdf->num_objs; i ++)
_pdfioObjDelete(pdf->objs[i]);
free(pdf->objs);
free(pdf->pages);
for (i = 0; i < pdf->num_strings; i ++)
free(pdf->strings[i]);
free(pdf->strings);
free(pdf);
return (ret);
}
//
// 'pdfioFileCreate()' - Create a PDF file.
//
pdfio_file_t * // O - PDF file or `NULL` on error
pdfioFileCreate(
const char *filename, // I - Filename
const char *version, // I - PDF version number or `NULL` for default (2.0)
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_data) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
// Range check input...
if (!filename)
return (NULL);
if (!version)
version = "2.0";
if (!error_cb)
{
error_cb = _pdfioFileDefaultError;
error_data = NULL;
}
// Allocate a PDF file structure...
if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
{
pdfio_file_t temp; // Dummy file
char message[8192]; // Message string
temp.filename = (char *)filename;
snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
(error_cb)(&temp, message, error_data);
return (NULL);
}
pdf->filename = strdup(filename);
pdf->version = strdup(version);
pdf->mode = _PDFIO_MODE_WRITE;
pdf->error_cb = error_cb;
pdf->error_data = error_data;
// Create the file...
if ((pdf->fd = open(filename, O_WRONLY | O_BINARY | O_CREAT | O_TRUNC, 0666)) < 0)
{
_pdfioFileError(pdf, "Unable to create file - %s", strerror(errno));
free(pdf->filename);
free(pdf->version);
free(pdf);
return (NULL);
}
// Write a standard PDF header...
if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
return (pdf);
}
//
// 'pdfioFileCreateObject()' - Create a new object in a PDF file.
//
pdfio_obj_t * // O - New object
pdfioFileCreateObject(
pdfio_file_t *pdf, // I - PDF file
pdfio_dict_t *dict) // I - Object dictionary
{
pdfio_obj_t *obj; // New object
// Range check input...
if (!pdf || !dict)
{
if (pdf)
_pdfioFileError(pdf, "Missing object dictionary.");
return (NULL);
}
if (dict->pdf != pdf)
dict = pdfioDictCopy(pdf, dict); // Copy dictionary to new PDF
// Allocate memory for the object...
if ((obj = (pdfio_obj_t *)calloc(1, sizeof(pdfio_obj_t))) == NULL)
{
_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
return (NULL);
}
// Expand the objects array as needed
if (pdf->num_objs >= pdf->alloc_objs)
{
pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->objs, (pdf->alloc_objs + 32) * sizeof(pdfio_obj_t *));
if (!temp)
{
_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
return (NULL);
}
pdf->objs = temp;
pdf->alloc_objs += 32;
}
pdf->objs[pdf->num_objs ++] = obj;
// Initialize the object...
obj->pdf = pdf;
obj->number = pdf->num_objs;
obj->dict = dict;
obj->offset = _pdfioFileTell(pdf);
// Don't write anything just yet...
return (obj);
}
//
// 'pdfioFileCreatePage()' - Create a page in a PDF file.
//
pdfio_obj_t * // O - New object
pdfioFileCreatePage(pdfio_file_t *pdf, // I - PDF file
pdfio_dict_t *dict) // I - Page dictionary
{
// TODO: Implement me
(void)pdf;
(void)dict;
return (NULL);
}
//
// 'pdfioFileGetName()' - Get a PDF's filename.
//
const char * // O - Filename
pdfioFileGetName(pdfio_file_t *pdf) // I - PDF file
{
return (pdf ? pdf->filename : NULL);
}
//
// 'pdfioFileGetNumObjects()' - Get the number of objects in a PDF file.
//
size_t // O - Number of objects
pdfioFileGetNumObjects(
pdfio_file_t *pdf) // I - PDF file
{
return (pdf ? pdf->num_objs : 0);
}
//
// 'pdfioFileGetNumPages()' - Get the number of pages in a PDF file.
//
size_t // O - Number of pages
pdfioFileGetNumPages(pdfio_file_t *pdf) // I - PDF file
{
return (pdf ? pdf->num_pages : 0);
}
//
// 'pdfioFileGetObject()' - Get an object from a PDF file.
//
pdfio_obj_t * // O - Object
pdfioFileGetObject(pdfio_file_t *pdf, // I - PDF file
size_t number) // I - Object number (starting at 1)
{
if (!pdf || number < 1 || number > pdf->num_objs)
return (NULL);
else
return (pdf->objs[number - 1]);
}
//
// 'pdfioFileGetPage()' - Get a page object from a PDF file.
//
pdfio_obj_t * // O - Object
pdfioFileGetPage(pdfio_file_t *pdf, // I - PDF file
size_t number) // I - Page number (starting at 1)
{
if (!pdf || number < 1 || number > pdf->num_pages)
return (NULL);
else
return (pdf->pages[number - 1]);
}
//
// '()' - Get the PDF version number for a PDF file.
//
const char * // O - Version number or `NULL`
pdfioFileGetVersion(
pdfio_file_t *pdf) // I - PDF file
{
return (pdf ? pdf->version : NULL);
}
//
// 'pdfioFileOpen()' - Open a PDF file for reading.
//
pdfio_file_t * // O - PDF file
pdfioFileOpen(
const char *filename, // I - Filename
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_data) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
// Range check input...
if (!filename)
return (NULL);
if (!error_cb)
{
error_cb = _pdfioFileDefaultError;
error_data = NULL;
}
// Allocate a PDF file structure...
if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
{
pdfio_file_t temp; // Dummy file
char message[8192]; // Message string
temp.filename = (char *)filename;
snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
(error_cb)(&temp, message, error_data);
return (NULL);
}
pdf->filename = strdup(filename);
pdf->mode = _PDFIO_MODE_READ;
pdf->error_cb = error_cb;
pdf->error_data = error_data;
// Open the file...
if ((pdf->fd = open(filename, O_RDONLY | O_BINARY)) < 0)
{
_pdfioFileError(pdf, "Unable to open file - %s", strerror(errno));
free(pdf->filename);
free(pdf);
return (NULL);
}
// TODO: read header, trailer, and xref table...
return (pdf);
}
//
// 'write_trailer()' - Write the PDF catalog object, xref table, and trailer.
//
static bool // O - `true` on success, `false` on failure
write_trailer(pdfio_file_t *pdf) // I - PDF file
{
// TODO: Write trailer
(void)pdf;
return (false);
}