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Split md5 function.

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Signed-off-by: yzrh <yzrh@noema.org>
This commit is contained in:
yzrh 2023-01-01 10:44:27 +00:00
parent a18de8f2ef
commit 9019a18449
4 changed files with 43 additions and 10 deletions
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4
src/Makefile
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@ -4,11 +4,11 @@
# SPDX-License-Identifier: Apache-2.0 # SPDX-License-Identifier: Apache-2.0
# #
src = melon.c iconv.c zlib.c jbig2.c jpeg.c jp2.c \ src = melon.c iconv.c zlib.c jbig2.c jpeg.c jp2.c md5.c \
cnki_caj.c cnki_hn.c cnki_kdh.c cnki_outline_tree.c cnki_pdf.c \ cnki_caj.c cnki_hn.c cnki_kdh.c cnki_outline_tree.c cnki_pdf.c \
cnki_zlib.c cnki_jbig.c cnki_jbig_dec.c cnki_jbig2.c cnki.c \ cnki_zlib.c cnki_jbig.c cnki_jbig_dec.c cnki_jbig2.c cnki.c \
pdf_cnki.c pdf_get.c pdf_parser.c pdf_writer.c pdf.c pdf_cnki.c pdf_get.c pdf_parser.c pdf_writer.c pdf.c
inc = extern.h version.h iconv.h zlib.h jbig2.h jpeg.h jp2.h \ inc = extern.h version.h iconv.h zlib.h jbig2.h jpeg.h jp2.h md5.h \
cnki.h pdf_cnki.h cnki_jbig.h cnki_jbig_dec.h pdf.h cnki.h pdf_cnki.h cnki_jbig.h cnki_jbig_dec.h pdf.h
obj = ${src:.c=.o} obj = ${src:.c=.o}

24
src/md5.c Normal file
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@ -0,0 +1,24 @@
/*
* Copyright (c) 2023, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <openssl/md5.h>
int
strmd5(unsigned char **dst, int *dst_size,
const unsigned char * restrict src, int src_size)
{
*dst_size = MD5_DIGEST_LENGTH;
*dst = malloc(*dst_size);
if (*dst == NULL)
return 1;
MD5(src, src_size, *dst);
return 0;
}

9
src/md5.h Normal file
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@ -0,0 +1,9 @@
/*
* Copyright (c) 2023, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
int
strmd5(unsigned char **dst, int *dst_size,
const unsigned char * restrict src, int src_size);

16
src/pdf_writer.c
View file

@ -5,11 +5,9 @@
*/ */
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#include <time.h> #include <time.h>
#include <openssl/md5.h> #include "md5.h"
#include "pdf.h" #include "pdf.h"
int int
@ -144,11 +142,11 @@ pdf_dump_trailer(pdf_object_t **pdf, FILE **fp, int xref)
buf_size = snprintf(buf, 64, "%lx%x", timestamp, size); buf_size = snprintf(buf, 64, "%lx%x", timestamp, size);
#endif #endif
unsigned char str[64]; int fid_size;
memcpy(str, buf, 64); unsigned char *fid;
unsigned char fid[MD5_DIGEST_LENGTH]; if (strmd5(&fid, &fid_size, (unsigned char *) buf, buf_size) != 0)
MD5(str, buf_size, fid); return 1;
pdf_object_t *ptr = *pdf; pdf_object_t *ptr = *pdf;
while (ptr->next != NULL) while (ptr->next != NULL)
@ -172,7 +170,7 @@ pdf_dump_trailer(pdf_object_t **pdf, FILE **fp, int xref)
for (int i = 0; i < 2; i++) { for (int i = 0; i < 2; i++) {
fputs("<", *fp); fputs("<", *fp);
for (int j = 0; j < MD5_DIGEST_LENGTH; j++) for (int j = 0; j < fid_size; j++)
fprintf(*fp, "%02x", fid[j]); fprintf(*fp, "%02x", fid[j]);
fputs(">", *fp); fputs(">", *fp);
@ -191,5 +189,7 @@ pdf_dump_trailer(pdf_object_t **pdf, FILE **fp, int xref)
fputs("%%EOF\n", *fp); fputs("%%EOF\n", *fp);
free(fid);
return 0; return 0;
} }