Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 1 | // Copyright 2020 Joe Drago. All rights reserved. |
| 2 | // SPDX-License-Identifier: BSD-2-Clause |
| 3 | |
| 4 | #include "avif/internal.h" |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <string.h> |
| 8 | |
| 9 | void avifIODestroy(avifIO * io) |
| 10 | { |
| 11 | if (io && io->destroy) { |
| 12 | io->destroy(io); |
| 13 | } |
| 14 | } |
| 15 | |
| 16 | // -------------------------------------------------------------------------------------- |
| 17 | // avifIOMemoryReader |
| 18 | |
| 19 | typedef struct avifIOMemoryReader |
| 20 | { |
| 21 | avifIO io; // this must be the first member for easy casting to avifIO* |
| 22 | avifROData rodata; |
| 23 | } avifIOMemoryReader; |
| 24 | |
| 25 | static avifResult avifIOMemoryReaderRead(struct avifIO * io, uint32_t readFlags, uint64_t offset, uint64_t size, avifROData * out) |
| 26 | { |
| 27 | // printf("avifIOMemoryReaderRead offset %zu size %zu\n", offset, size); |
| 28 | |
| 29 | (void)readFlags; |
| 30 | |
| 31 | avifIOMemoryReader * reader = (avifIOMemoryReader *)io; |
| 32 | |
| 33 | // Sanitize/clamp incoming request |
| 34 | if (offset >= reader->rodata.size) { |
| 35 | offset = 0; |
| 36 | size = 0; |
| 37 | } |
| 38 | if ((offset + size) > reader->rodata.size) { |
| 39 | size = reader->rodata.size - offset; |
| 40 | } |
| 41 | |
| 42 | out->data = reader->rodata.data + offset; |
| 43 | out->size = size; |
| 44 | return AVIF_RESULT_OK; |
| 45 | } |
| 46 | |
| 47 | static void avifIOMemoryReaderDestroy(struct avifIO * io) |
| 48 | { |
| 49 | avifFree(io); |
| 50 | } |
| 51 | |
| 52 | avifIO * avifIOCreateMemoryReader(const uint8_t * data, size_t size) |
| 53 | { |
| 54 | avifIOMemoryReader * reader = avifAlloc(sizeof(avifIOMemoryReader)); |
| 55 | memset(reader, 0, sizeof(avifIOMemoryReader)); |
| 56 | reader->io.destroy = avifIOMemoryReaderDestroy; |
| 57 | reader->io.read = avifIOMemoryReaderRead; |
Joe Drago | 0675bef | 2020-09-21 13:03:41 -0700 | [diff] [blame] | 58 | reader->io.sizeHint = size; |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 59 | reader->io.persistent = AVIF_TRUE; |
| 60 | reader->rodata.data = data; |
| 61 | reader->rodata.size = size; |
| 62 | return (avifIO *)reader; |
| 63 | } |
| 64 | |
| 65 | // -------------------------------------------------------------------------------------- |
| 66 | // avifIOFileReader |
| 67 | |
| 68 | typedef struct avifIOFileReader |
| 69 | { |
| 70 | avifIO io; // this must be the first member for easy casting to avifIO* |
| 71 | avifRWData buffer; |
| 72 | FILE * f; |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 73 | } avifIOFileReader; |
| 74 | |
| 75 | static avifResult avifIOFileReaderRead(struct avifIO * io, uint32_t readFlags, uint64_t offset, uint64_t size, avifROData * out) |
| 76 | { |
| 77 | // printf("avifIOFileReaderRead offset %zu size %zu\n", offset, size); |
| 78 | |
| 79 | (void)readFlags; |
| 80 | |
| 81 | avifIOFileReader * reader = (avifIOFileReader *)io; |
| 82 | if (!reader->f) { |
| 83 | return AVIF_RESULT_IO_ERROR; |
| 84 | } |
| 85 | |
Joe Drago | 0675bef | 2020-09-21 13:03:41 -0700 | [diff] [blame] | 86 | if (offset < reader->io.sizeHint) { |
| 87 | uint64_t availableSize = reader->io.sizeHint - offset; |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 88 | if (size > availableSize) { |
| 89 | size = availableSize; |
| 90 | } |
| 91 | } else { |
| 92 | // The offset is past the EOF. |
| 93 | size = 0; |
| 94 | } |
| 95 | |
| 96 | if (size > 0) { |
| 97 | if (reader->buffer.size < size) { |
| 98 | avifRWDataRealloc(&reader->buffer, size); |
| 99 | } |
| 100 | if (fseek(reader->f, (long)offset, SEEK_SET) != 0) { |
| 101 | return AVIF_RESULT_IO_ERROR; |
| 102 | } |
| 103 | size_t bytesRead = fread(reader->buffer.data, 1, size, reader->f); |
| 104 | if (size != bytesRead) { |
| 105 | size = bytesRead; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | out->data = reader->buffer.data; |
| 110 | out->size = size; |
| 111 | return AVIF_RESULT_OK; |
| 112 | } |
| 113 | |
| 114 | static void avifIOFileReaderDestroy(struct avifIO * io) |
| 115 | { |
| 116 | avifIOFileReader * reader = (avifIOFileReader *)io; |
Derek Buitenhuis | 1610471 | 2020-09-23 17:46:45 +0100 | [diff] [blame^] | 117 | if (reader->f) { |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 118 | fclose(reader->f); |
| 119 | } |
| 120 | avifRWDataFree(&reader->buffer); |
| 121 | avifFree(io); |
| 122 | } |
| 123 | |
Derek Buitenhuis | 1610471 | 2020-09-23 17:46:45 +0100 | [diff] [blame^] | 124 | avifIO * avifIOCreateFileReader(const char * filename) |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 125 | { |
Derek Buitenhuis | 1610471 | 2020-09-23 17:46:45 +0100 | [diff] [blame^] | 126 | FILE * f = fopen(filename, "rb"); |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 127 | if (!f) { |
| 128 | return NULL; |
| 129 | } |
| 130 | |
| 131 | fseek(f, 0, SEEK_END); |
| 132 | size_t fileSize = (size_t)ftell(f); |
| 133 | fseek(f, 0, SEEK_SET); |
| 134 | |
| 135 | avifIOFileReader * reader = avifAlloc(sizeof(avifIOFileReader)); |
| 136 | memset(reader, 0, sizeof(avifIOFileReader)); |
| 137 | reader->f = f; |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 138 | reader->io.destroy = avifIOFileReaderDestroy; |
| 139 | reader->io.read = avifIOFileReaderRead; |
Joe Drago | 0675bef | 2020-09-21 13:03:41 -0700 | [diff] [blame] | 140 | reader->io.sizeHint = fileSize; |
Joe Drago | be4cbb9 | 2020-09-21 12:14:05 -0700 | [diff] [blame] | 141 | reader->io.persistent = AVIF_FALSE; |
| 142 | avifRWDataRealloc(&reader->buffer, 1024); |
| 143 | return (avifIO *)reader; |
| 144 | } |