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Implement object mapping framework.

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Michael R Sweet 2021-05-13 13:18:01 -04:00
parent 7cb4d0a557
commit 17f2cc213e
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GPG Key ID: 999559A027815955
2 changed files with 109 additions and 2 deletions
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97
pdfio-file.c
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@ -22,6 +22,7 @@
//
static pdfio_obj_t *add_obj(pdfio_file_t *pdf, size_t number, unsigned short generation, off_t offset);
static int compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
static int compare_objs(pdfio_obj_t **a, pdfio_obj_t **b);
static bool load_obj_stream(pdfio_obj_t *obj);
static bool load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj);
@ -29,6 +30,48 @@ static bool load_xref(pdfio_file_t *pdf, off_t xref_offset);
static bool write_trailer(pdfio_file_t *pdf);
//
// '_pdfioFileAddMappedObject()' - Add a mapped object.
//
bool // O - `true` on success, `false` on failure
_pdfioFileAddMappedObject(
pdfio_file_t *pdf, // I - Destination PDF file
pdfio_obj_t *dst_obj, // I - Destination object
pdfio_obj_t *src_obj) // I - Source object
{
_pdfio_objmap_t *map; // Object map
// Allocate memory as needed...
if (pdf->num_objmaps >= pdf->alloc_objmaps)
{
if ((map = realloc(pdf->objmaps, (pdf->alloc_objmaps + 16) * sizeof(_pdfio_objmap_t))) == NULL)
{
_pdfioFileError(pdf, "Unable to allocate memory for object map.");
return (false);
}
pdf->alloc_objmaps += 16;
pdf->objmaps = map;
}
// Add an object to the end...
map = pdf->objmaps + pdf->num_objmaps;
pdf->num_objmaps ++;
map->obj = dst_obj;
map->src_pdf = src_obj->pdf;
map->src_number = src_obj->number;
// Sort as needed...
if (pdf->num_objmaps > 1 && compare_objmaps(map, pdf->objmaps + pdf->num_objmaps - 2) < 0)
qsort(pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps);
return (true);
}
//
// 'pdfioFileClose()' - Close a PDF file and free all memory used for it.
//
@ -67,6 +110,8 @@ pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
_pdfioObjDelete(pdf->objs[i]);
free(pdf->objs);
free(pdf->objmaps);
free(pdf->pages);
for (i = 0; i < pdf->num_strings; i ++)
@ -225,6 +270,35 @@ pdfioFileCreatePage(pdfio_file_t *pdf, // I - PDF file
}
//
// '_pdfioFileFindMappedObject()' - Find a mapped object.
//
pdfio_obj_t * // O - Match object or `NULL` if none
_pdfioFileFindMappedObject(
pdfio_file_t *pdf, // I - Destination PDF file
pdfio_file_t *src_pdf, // I - Source PDF file
size_t src_number) // I - Source object number
{
_pdfio_objmap_t key, // Search key
*match; // Matching object map
// If we have no mapped objects, return NULL immediately...
if (pdf->num_objmaps == 0)
return (NULL);
// Otherwise search for a match...
key.src_pdf = src_pdf;
key.src_number = src_number;
if ((match = (_pdfio_objmap_t *)bsearch(&key, pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps)) != NULL)
return (match->obj);
else
return (NULL);
}
//
// 'pdfioFileFindObject()' - Find an object using its object number.
//
@ -493,11 +567,32 @@ add_obj(pdfio_file_t *pdf, // I - PDF file
}
//
// 'compare_objmaps()' - Compare two object maps...
//
static int // O - Result of comparison
compare_objmaps(_pdfio_objmap_t *a, // I - First object map
_pdfio_objmap_t *b) // I - Second object map
{
if (a->src_pdf < b->src_pdf)
return (-1);
else if (a->src_pdf > b->src_pdf)
return (1);
else if (a->src_number < b->src_number)
return (-1);
else if (a->src_number > b->src_number)
return (1);
else
return (0);
}
//
// 'compare_objs()' - Compare the object numbers of two objects.
//
static int
static int // O - Result of comparison
compare_objs(pdfio_obj_t **a, // I - First object
pdfio_obj_t **b) // I - Second object
{

14
pdfio-private.h
View File

@ -135,7 +135,7 @@ typedef struct _pdfio_pair_s // Key/value pair
_pdfio_value_t value; // Value
} _pdfio_pair_t;
struct _pdfio_dict_s
struct _pdfio_dict_s // Dictionary
{
pdfio_file_t *pdf; // PDF file
size_t num_pairs, // Number of pairs in use
@ -143,6 +143,13 @@ struct _pdfio_dict_s
_pdfio_pair_t *pairs; // Array of pairs
};
typedef struct _pdfio_objmap_s // PDF object map
{
pdfio_obj_t *obj; // Object for this file
pdfio_file_t *src_pdf; // Source PDF file
size_t src_number; // Source object number
} _pdfio_objmap_t;
struct _pdfio_file_s // PDF file structure
{
char *filename; // Filename
@ -173,6 +180,9 @@ struct _pdfio_file_s // PDF file structure
size_t num_objs, // Number of objects
alloc_objs; // Allocated objects
pdfio_obj_t **objs; // Objects
size_t num_objmaps, // Number of object maps
alloc_objmaps; // Allocated object maps
_pdfio_objmap_t *objmaps; // Object maps
size_t num_pages, // Number of pages
alloc_pages; // Allocated pages
pdfio_obj_t **pages; // Pages
@ -230,9 +240,11 @@ extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf, _pdfio_token_t *ts) PDFIO
extern bool _pdfioDictSetValue(pdfio_dict_t *dict, const char *key, _pdfio_value_t *value) PDFIO_INTERNAL;
extern bool _pdfioDictWrite(pdfio_dict_t *dict, off_t *length) PDFIO_INTERNAL;
extern bool _pdfioFileAddMappedObject(pdfio_file_t *pdf, pdfio_obj_t *dst_obj, pdfio_obj_t *src_obj) PDFIO_INTERNAL;
extern bool _pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) PDFIO_INTERNAL;
extern bool _pdfioFileDefaultError(pdfio_file_t *pdf, const char *message, void *data) PDFIO_INTERNAL;
extern bool _pdfioFileError(pdfio_file_t *pdf, const char *format, ...) PDFIO_FORMAT(2,3) PDFIO_INTERNAL;
extern pdfio_obj_t *_pdfioFileFindMappedObject(pdfio_file_t *pdf, pdfio_file_t *src_pdf, size_t src_number) PDFIO_INTERNAL;
extern bool _pdfioFileFlush(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern int _pdfioFileGetChar(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern bool _pdfioFileGets(pdfio_file_t *pdf, char *buffer, size_t bufsize) PDFIO_INTERNAL;