150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "file.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#if HAVE_MMAP
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#include <sys/mman.h>
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#elif HAVE_MAPVIEWOFFILE
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#include <io.h>
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#include <windows.h>
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#endif
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typedef struct {
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const AVClass *class;
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int log_offset;
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void *log_ctx;
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} FileLogContext;
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static const AVClass file_log_ctx_class = {
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"FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
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offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
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};
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int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
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int log_offset, void *log_ctx)
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{
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FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
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int err, fd = open(filename, O_RDONLY);
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struct stat st;
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av_unused void *ptr;
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off_t off_size;
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char errbuf[128];
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size_t max_size = HAVE_MMAP ? SIZE_MAX : FF_INTERNAL_MEM_TYPE_MAX_VALUE;
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*bufptr = NULL;
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if (fd < 0) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
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return err;
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}
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if (fstat(fd, &st) < 0) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
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close(fd);
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return err;
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}
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off_size = st.st_size;
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if (off_size > max_size) {
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av_log(&file_log_ctx, AV_LOG_ERROR,
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"File size for file '%s' is too big\n", filename);
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close(fd);
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return AVERROR(EINVAL);
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}
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*size = off_size;
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#if HAVE_MMAP
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ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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if ((int)(ptr) == -1) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
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close(fd);
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return err;
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}
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*bufptr = ptr;
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#elif HAVE_MAPVIEWOFFILE
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{
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HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
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mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
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if (!mh) {
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
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close(fd);
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return -1;
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}
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ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
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CloseHandle(mh);
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if (!ptr) {
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
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close(fd);
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return -1;
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}
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*bufptr = ptr;
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}
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#else
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*bufptr = av_malloc(*size);
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if (!*bufptr) {
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av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
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close(fd);
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return AVERROR(ENOMEM);
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}
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read(fd, *bufptr, *size);
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#endif
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close(fd);
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return 0;
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}
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void av_file_unmap(uint8_t *bufptr, size_t size)
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{
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#if HAVE_MMAP
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munmap(bufptr, size);
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#elif HAVE_MAPVIEWOFFILE
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UnmapViewOfFile(bufptr);
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#else
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av_free(bufptr);
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#endif
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}
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#ifdef TEST
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#undef printf
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int main(void)
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{
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uint8_t *buf;
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size_t size;
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if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
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return 1;
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buf[0] = 's';
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printf("%s", buf);
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av_file_unmap(buf, size);
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return 0;
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}
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#endif
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