Coverage Report

Created: 2025-06-10 07:26

/src/ghostpdl/base/sjpegc.c
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/* Copyright (C) 2001-2025 Artifex Software, Inc.
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   All Rights Reserved.
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   This software is provided AS-IS with no warranty, either express or
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   implied.
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   This software is distributed under license and may not be copied,
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   modified or distributed except as expressly authorized under the terms
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   of the license contained in the file LICENSE in this distribution.
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   Refer to licensing information at http://www.artifex.com or contact
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   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
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   CA 94129, USA, for further information.
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*/
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/* Interface routines for IJG code, common to encode/decode. */
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#include "stdio_.h"
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#include "string_.h"
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#include "jpeglib_.h"
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#include "jerror_.h"
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#include "gx.h"
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#include "gserrors.h"
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#include "strimpl.h"
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#include "sdct.h"
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#include "sjpeg.h"
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#include "gsmchunk.h"
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#include "setjmp_.h"
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#if !defined(SHARE_JPEG) || SHARE_JPEG==0
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#include "jmemcust.h"
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#endif
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/*
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  Ghostscript uses a non-public interface to libjpeg in order to
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  override the library's default memory manager implementation.
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  Since many users will want to compile Ghostscript using the
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  shared jpeg library, we provide these prototypes so that a copy
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  of the libjpeg source distribution is not needed.
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  The presence of the jmemsys.h header file is detected in
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  unix-aux.mak, and written to gconfig_.h
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 */
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#include "gconfig_.h"
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/*
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 * Error handling routines (these replace corresponding IJG routines from
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 * jpeg/jerror.c).  These are used for both compression and decompression.
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 * We assume
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 * offset_of(jpeg_compress_data, cinfo)==offset_of(jpeg_decompress_data, dinfo)
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 */
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OPTIMIZE_SETJMP
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static void
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gs_jpeg_error_exit(j_common_ptr cinfo)
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342
{
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    jpeg_stream_data *jcomdp =
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    (jpeg_stream_data *) ((char *)cinfo -
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                          offset_of(jpeg_compress_data, cinfo));
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    longjmp(find_jmp_buf(jcomdp->exit_jmpbuf), 1);
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}
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static void
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gs_jpeg_emit_message(j_common_ptr cinfo, int msg_level)
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42.0k
{
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42.0k
    if (msg_level < 0) { /* GS policy is to ignore IJG warnings when Picky=0,
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                                 * treat them as errors when Picky=1.
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                                 */
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2.72k
        jpeg_stream_data *jcomdp =
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2.72k
        (jpeg_stream_data *) ((char *)cinfo -
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2.72k
                              offset_of(jpeg_compress_data, cinfo));
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        if (jcomdp->Picky)
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0
            gs_jpeg_error_exit(cinfo);
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2.72k
    }
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    /* Trace messages are always ignored. */
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42.0k
}
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/*
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 * This routine initializes the error manager fields in the JPEG object.
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 * It is based on jpeg_std_error from jpeg/jerror.c.
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 */
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void
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gs_jpeg_error_setup(stream_DCT_state * st)
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1.41k
{
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    struct jpeg_error_mgr *err = &st->data.common->err;
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    /* Initialize the JPEG compression object with default error handling */
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1.41k
    jpeg_std_error(err);
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    /* Replace some methods with our own versions */
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1.41k
    err->error_exit = gs_jpeg_error_exit;
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1.41k
    err->emit_message = gs_jpeg_emit_message;
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    st->data.compress->cinfo.err = err;   /* works for decompress case too */
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}
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/* Stuff the IJG error message into errorinfo after an error exit. */
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int
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gs_jpeg_log_error(stream_DCT_state * st)
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{
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    j_common_ptr cinfo = (j_common_ptr) & st->data.compress->cinfo;
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    char buffer[JMSG_LENGTH_MAX];
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    /* Format the error message */
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    (*cinfo->err->format_message) (cinfo, buffer);
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    (*st->report_error) ((stream_state *) st, buffer);
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    return_error(gs_error_ioerror); /* caller will do return_error() */
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}
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/*
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 * Interface routines.  This layer of routines exists solely to limit
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 * side-effects from using setjmp.
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 */
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OPTIMIZE_SETJMP
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JQUANT_TBL *
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gs_jpeg_alloc_quant_table(stream_DCT_state * st)
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0
{
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0
    if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf))) {
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0
        gs_jpeg_log_error(st);
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0
        return NULL;
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0
    }
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    return jpeg_alloc_quant_table((j_common_ptr)
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0
                                  & st->data.compress->cinfo);
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0
}
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OPTIMIZE_SETJMP
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JHUFF_TBL *
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gs_jpeg_alloc_huff_table(stream_DCT_state * st)
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0
{
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0
    if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf))) {
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        gs_jpeg_log_error(st);
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        return NULL;
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0
    }
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    return jpeg_alloc_huff_table((j_common_ptr)
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                                 & st->data.compress->cinfo);
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0
}
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OPTIMIZE_SETJMP
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int
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gs_jpeg_destroy(stream_DCT_state * st)
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1.41k
{
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1.41k
    if (st->data.common && setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
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        return_error(gs_jpeg_log_error(st));
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    if (st->data.compress){
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        jpeg_destroy((j_common_ptr) & st->data.compress->cinfo);
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        gs_jpeg_mem_term((j_common_ptr) & st->data.compress->cinfo);
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    }
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    return 0;
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}
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#if !defined(SHARE_JPEG) || SHARE_JPEG==0
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static void *gs_j_mem_alloc(j_common_ptr cinfo, size_t size)
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10.2k
{
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    gs_memory_t *mem = (gs_memory_t *)(GET_CUST_MEM_DATA(cinfo)->priv);
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    return(gs_alloc_bytes(mem, size, "JPEG allocation"));
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}
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static void gs_j_mem_free(j_common_ptr cinfo, void *object, size_t size)
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10.2k
{
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    gs_memory_t *mem = (gs_memory_t *)(GET_CUST_MEM_DATA(cinfo)->priv);
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    gs_free_object(mem, object, "JPEG free");
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10.2k
}
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static long gs_j_mem_init (j_common_ptr cinfo)
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1.41k
{
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1.41k
    gs_memory_t *mem = (gs_memory_t *)(GET_CUST_MEM_DATA(cinfo)->priv);
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1.41k
    gs_memory_t *cmem = NULL;
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    if (gs_memory_chunk_wrap(&(cmem), mem) < 0) {
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0
        return (-1);
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0
    }
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1.41k
    (void)jpeg_cust_mem_set_private(GET_CUST_MEM_DATA(cinfo), cmem);
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1.41k
    return 0;
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1.41k
}
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static void gs_j_mem_term (j_common_ptr cinfo)
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1.41k
{
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1.41k
    gs_memory_t *cmem = (gs_memory_t *)(GET_CUST_MEM_DATA(cinfo)->priv);
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1.41k
    gs_memory_t *mem = gs_memory_chunk_unwrap(cmem);
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    if (mem == cmem)
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0
        return;
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    (void)jpeg_cust_mem_set_private(GET_CUST_MEM_DATA(cinfo), mem);
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1.41k
}
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#endif /* SHAREJPEG == 0 */
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int gs_jpeg_mem_init (gs_memory_t *mem, j_common_ptr cinfo)
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1.41k
{
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1.41k
    int code = 0;
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1.41k
#if !defined(SHARE_JPEG) || SHARE_JPEG==0
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1.41k
    jpeg_cust_mem_data custm, *custmptr;
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    memset(&custm, 0x00, sizeof(custm));
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    /* JPEG allocated chunks don't need to be subject to gc. */
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    mem = mem->non_gc_memory;
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    if (!jpeg_cust_mem_init(&custm, (void *) mem, gs_j_mem_init, gs_j_mem_term, NULL,
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                            gs_j_mem_alloc, gs_j_mem_free,
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1.41k
                            gs_j_mem_alloc, gs_j_mem_free, NULL)) {
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0
        code = gs_note_error(gs_error_VMerror);
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0
    }
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1.41k
    if (code == 0) {
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1.41k
        custmptr = (jpeg_cust_mem_data *)gs_alloc_bytes(mem, sizeof(custm) + sizeof(void *), "JPEG custom memory descriptor");
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1.41k
        if (!custmptr) {
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0
            code = gs_note_error(gs_error_VMerror);
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0
        }
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1.41k
        else {
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1.41k
            memcpy(custmptr, &custm, sizeof(custm));
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1.41k
            cinfo->client_data = custmptr;
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1.41k
        }
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    }
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#endif /* SHAREJPEG == 0 */
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1.41k
    return code;
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}
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void
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gs_jpeg_mem_term(j_common_ptr cinfo)
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1.41k
{
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1.41k
#if !defined(SHARE_JPEG) || SHARE_JPEG==0
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1.41k
    if (cinfo->client_data) {
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1.41k
        jpeg_cust_mem_data *custmptr = (jpeg_cust_mem_data *)cinfo->client_data;
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1.41k
        gs_memory_t *mem = (gs_memory_t *)(GET_CUST_MEM_DATA(cinfo)->priv);
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1.41k
        gs_free_object(mem, custmptr, "gs_jpeg_mem_term");
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        cinfo->client_data = NULL;
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    }
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#endif /* SHAREJPEG == 0 */
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1.41k
}