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https://github.com/michaelrsweet/pdfio.git
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Fix object map to use unique file hash instead of pointer values (Issue #125)
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Michael R Sweet
parent
5b08046ece
commit
57a01a7317
@ -27,6 +27,8 @@ v1.5.3 - YYYY-MM-DD
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- Fixed decryption of UTF-16 strings (Issue #42)
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- Fixed decryption of PDF files with large permission values.
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- Fixed support for EncryptMetadata key in the encryption dictionary.
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- Fixed `pdfioObjCopy` and `pdfioPageCopy` to properly identify the source PDF
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file being used (Issue #125)
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v1.5.2 - 2025-04-12
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@ -8,8 +8,8 @@
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//
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// Usage:
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//
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// ./pdfmerge [-o OUTPUT.pdf] INPUT.pdf [... INPUT.pdf]
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// ./pdfmerge INPUT.pdf [... INPUT.pdf] >OUTPUT.pdf
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// ./pdfiomerge [-o OUTPUT.pdf] INPUT.pdf [... INPUT.pdf]
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// ./pdfiomerge INPUT.pdf [... INPUT.pdf] >OUTPUT.pdf
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//
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#include <pdfio.h>
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@ -47,7 +47,7 @@ main(int argc, // I - Number of command-line arguments
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}
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else if (!strncmp(argv[i], "--", 2))
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{
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fprintf(stderr, "pdfmerge: Unknown option '%s'.\n", argv[i]);
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fprintf(stderr, "pdfiomerge: Unknown option '%s'.\n", argv[i]);
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return (usage(stderr));
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}
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else if (argv[i][0] == '-')
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@ -59,14 +59,14 @@ main(int argc, // I - Number of command-line arguments
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case 'o' : // -o OUTPUT.pdf
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if (outpdf)
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{
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fputs("pdfmerge: Only one output file can be specified.\n", stderr);
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fputs("pdfiomerge: Only one output file can be specified.\n", stderr);
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return (usage(stderr));
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}
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i ++;
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if (i >= argc)
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{
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fputs("pdfmerge: Missing output filename after '-o'.\n", stderr);
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fputs("pdfiomerge: Missing output filename after '-o'.\n", stderr);
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return (usage(stderr));
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}
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@ -75,7 +75,7 @@ main(int argc, // I - Number of command-line arguments
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break;
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default :
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fprintf(stderr, "pdfmerge: Unknown option '-%c'.\n", *opt);
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fprintf(stderr, "pdfiomerge: Unknown option '-%c'.\n", *opt);
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return (usage(stderr));
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}
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}
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44
pdfio-file.c
44
pdfio-file.c
@ -64,9 +64,10 @@ _pdfioFileAddMappedObj(
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pdf->num_objmaps ++;
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map->obj = dst_obj;
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map->src_pdf = src_obj->pdf;
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map->src_number = src_obj->number;
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memcpy(map->src_id, src_obj->pdf->file_id, sizeof(map->src_id));
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// Sort as needed...
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if (pdf->num_objmaps > 1 && compare_objmaps(map, pdf->objmaps + pdf->num_objmaps - 2) < 0)
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qsort(pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps);
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@ -685,7 +686,7 @@ _pdfioFileFindMappedObj(
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return (NULL);
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// Otherwise search for a match...
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key.src_pdf = src_pdf;
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memcpy(key.src_id, src_pdf->file_id, sizeof(key.src_id));
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key.src_number = src_number;
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if ((match = (_pdfio_objmap_t *)bsearch(&key, pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps)) != NULL)
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@ -1046,6 +1047,10 @@ pdfioFileOpen(
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*end; // End of line
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ssize_t bytes; // Bytes read
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off_t xref_offset; // Offset to xref table
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time_t curtime; // Creation date/time
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unsigned char *id_value; // ID value
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size_t id_valuelen; // Length of ID value
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_pdfio_sha256_t ctx; // Hashing context
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PDFIO_DEBUG("pdfioFileOpen(filename=\"%s\", password_cb=%p, password_cbdata=%p, error_cb=%p, error_cbdata=%p)\n", filename, (void *)password_cb, (void *)password_cbdata, (void *)error_cb, (void *)error_cbdata);
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@ -1146,6 +1151,18 @@ pdfioFileOpen(
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goto error;
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}
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// Create the unique file identifier string for the object map...
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curtime = pdfioFileGetCreationDate(pdf);
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_pdfioCryptoSHA256Init(&ctx);
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_pdfioCryptoSHA256Append(&ctx, (uint8_t *)pdf->filename, strlen(pdf->filename));
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_pdfioCryptoSHA256Append(&ctx, (uint8_t *)&curtime, sizeof(curtime));
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if ((id_value = pdfioArrayGetBinary(pdf->id_array, 0, &id_valuelen)) != NULL)
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_pdfioCryptoSHA256Append(&ctx, id_value, id_valuelen);
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if ((id_value = pdfioArrayGetBinary(pdf->id_array, 1, &id_valuelen)) != NULL)
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_pdfioCryptoSHA256Append(&ctx, id_value, id_valuelen);
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_pdfioCryptoSHA256Finish(&ctx, pdf->file_id);
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return (pdf);
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@ -1420,10 +1437,11 @@ static int // O - Result of comparison
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compare_objmaps(_pdfio_objmap_t *a, // I - First object map
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_pdfio_objmap_t *b) // I - Second object map
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{
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if (a->src_pdf < b->src_pdf)
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return (-1);
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else if (a->src_pdf > b->src_pdf)
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return (1);
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int ret = memcmp(a->src_id, b->src_id, sizeof(a->src_id));
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// Result of comparison
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if (ret)
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return (ret);
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else if (a->src_number < b->src_number)
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return (-1);
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else if (a->src_number > b->src_number)
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@ -1452,6 +1470,8 @@ create_common(
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pdfio_file_t *pdf; // New PDF file
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pdfio_dict_t *dict; // Dictionary
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unsigned char id_value[16]; // File ID value
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time_t curtime; // Creation date/time
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_pdfio_sha256_t ctx; // Hashing context
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PDFIO_DEBUG("create_common(filename=\"%s\", fd=%d, output_cb=%p, output_cbdata=%p, version=\"%s\", media_box=%p, crop_box=%p, error_cb=%p, error_cbdata=%p)\n", filename, fd, (void *)output_cb, (void *)output_cbdata, version, (void *)media_box, (void *)crop_box, (void *)error_cb, (void *)error_cbdata);
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@ -1542,7 +1562,9 @@ create_common(
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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goto error;
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pdfioDictSetDate(dict, "CreationDate", time(NULL));
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curtime = time(NULL);
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pdfioDictSetDate(dict, "CreationDate", curtime);
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pdfioDictSetString(dict, "Producer", "pdfio/" PDFIO_VERSION);
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if ((pdf->info_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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@ -1567,6 +1589,14 @@ create_common(
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pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
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}
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// Create the unique file identifier string for the object map...
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_pdfioCryptoSHA256Init(&ctx);
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_pdfioCryptoSHA256Append(&ctx, (uint8_t *)pdf->filename, strlen(pdf->filename));
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_pdfioCryptoSHA256Append(&ctx, (uint8_t *)&curtime, sizeof(curtime));
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_pdfioCryptoSHA256Append(&ctx, id_value, sizeof(id_value));
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_pdfioCryptoSHA256Append(&ctx, id_value, sizeof(id_value));
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_pdfioCryptoSHA256Finish(&ctx, pdf->file_id);
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return (pdf);
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// Common error handling code...
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@ -79,6 +79,10 @@ pdfioObjCopy(pdfio_file_t *pdf, // I - PDF file
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if (srcobj->value.type == PDFIO_VALTYPE_NONE)
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_pdfioObjLoad(srcobj);
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// See if we have already mapped this object...
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if ((dstobj = _pdfioFileFindMappedObj(pdf, srcobj->pdf, srcobj->number)) != NULL)
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return (dstobj); // Yes, return that one...
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// Create the new object...
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if ((dstobj = _pdfioFileCreateObj(pdf, srcobj->pdf, NULL)) == NULL)
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return (NULL);
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@ -221,7 +221,7 @@ struct _pdfio_dict_s // Dictionary
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typedef struct _pdfio_objmap_s // PDF object map
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{
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pdfio_obj_t *obj; // Object for this file
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pdfio_file_t *src_pdf; // Source PDF file
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unsigned char src_id[32]; // Source PDF file file identifier
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size_t src_number; // Source object number
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} _pdfio_objmap_t;
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@ -236,6 +236,7 @@ typedef struct _pdfio_strbuf_s // PDF string buffer
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struct _pdfio_file_s // PDF file structure
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{
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char *filename; // Filename
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unsigned char file_id[32]; // File identifier bytes
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struct lconv *loc; // Locale data
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char *version; // Version number
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pdfio_rect_t media_box, // Default MediaBox value
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